GROUND-WATER QUALITY IN GEORGIA FOR 2012 John C. Donahue and Anthony W. Chumbley GEORGIA DEPARTMENT OF NATURAL RESOURCES ENVIRONMENTAL PROTECTION DIVISION WATERSHED PROTECTION BRANCH WATERSHED PLANNING AND MONITORING PROGRAM ATLANTA 2017 CIRCULAR 12Z GROUND-WATER QUALITY IN GEORGIA FOR 2012 John C. Donahue and Anthony W. Chumbley The preparation ofthis report wasfunded in part through a grantfrom the US. Environmental Protection Agency under the provisions ofSection 106 ofthe Federal Water Pollution Control Act of 1972, as amended. GEORGIA DEPARTMENT OF NATURAL RESOURCES Mark Williams, Commissioner ENVIRONMENTAL PROTECTION DIVISION Richard E. Dunn, Director WATERSHED PROTECTION BRANCH James A. Capp, Branch Chief ATLANTA 2017 CIRCULAR 12Z TABLE OF CONTENTS CHAPTER 1 INTRODUCTION......................................................... M 1.1 PURPOSE AND SCOPE......................................................................... 1-1 1.2 FACTORS AFFECTING CHEMICAL GROUND-WATER QUALITY..... 1-2 1.3 HYDROGEOLOGIC PROVINCES OF GEORGIA.................................. 1 -3 1.3.1 Coastal Plain Province........................................................................ 1-3 1.3.2 Piedmont/Blue Ridge Province......................................................... 1-5 1.3.3 Valley and Ridge Province................................................................. 1-6 1.3.4 Appalachian Plateau Province........................................................... 1-6 1.4 REGIONAL GROUND-WATER PROBLEMS......................................... 1-6 CHAPTER 2 GEORGIA GROUND-WATER MONITORING NETWORK...... Z4 2.1 MONITORING STATIONS......................................................................... 2-1 2.2 USES AND LIMITATIONS................. 2-1 2.3 ANALYSES AND DATA RETENTION..................................................... 2-3 CHAPTER 3 GROUND-WATER QUALITY IN GEORGIA............................. M 3.1 OVERVIEW................................................................................................. 3-1 3.2 CRETACEOUS AQUIFER SYSTEM................................... 3-3 3.2.1 Aquifer System Description..................................................................... 3-3 3.2.2 Field parameters...................................................................................... 3-3 3.2.3 Major Anions, Non-Metals, and Volatile Organic Compounds............... 3-5 3.2.4 Metals by Inductively-Coupled Plasma Spectrometry (ICP)................... 3-5 3.2.5 Metals by Inductively-Coupled Plasma Mass Spectrometry (ICPMS) 3-5 3.3 CLAYTON AQUIFER 3-6 3.4 CLAIBORNE AQUIFER................................................................................. 3-8 3.4.1 Aquifer Description.................................................................................. 3-8 3.4.2 Field parameters...................................................................................... 3-8 3.4.3 Major Anions, Non-Metals, and Volatile Organic Compounds............... 3-10 3.4.4 Metals by Inductively-Coupled Plasma Spectrometry (ICP)................. 3-10 3.4.5 Metals by Inductively-Coupled Plasma/Mass Spectrometry (ICPMS)............................................................................................................... 3-10 3.5 JACKSONIAN AQUIFER............................................................................ 3-10 3.5.1 Aquifer Description................................................................................... 3-10 3.5.2 Field parameters...................................................................................... 3-12 3.5.3 Major Anions, Non-Metals, and Volatile Organic Compounds................ 3-12 3.5.4 Metals by Inductively-Coupled Plasma Spectrometry (ICP).................. 3-12 3.5.5 Metals by Inductively-Coupled Plasma/Mass Spectrometry (ICPMS)................................................................................................................ 3-12 3.6 FLORIDAN AQUIFER SYSTEM................................................................. 3-13 3.6.1 Aquifer System Description........................................................................ 3-15 3.6.2 Field parameters......................................................................................... 3-15 3.6.3 Major Anions, Non-Metals, and Volatile Organic Compounds.................. 3-15 3.6.4 Metals by Inductively-Coupled Plasma Spectrometry (ICP)...................... 3-16 3.6.5 Metals by Inductively-Coupled Plasma Mass Spectrometry (ICPMS)................................................................................................................ 3-17 3.7 MIOCENE/SURFICIAL AQUIFER SYSTEM................................................. 3-18 3.7.1 Aquifer System Characteristics.............................................................. 3-18 ii 3.7.2 Field Parameters...................................................................................... 3-20 3.7.3 Major Anions, Non-Metals, and Volatile Organic Compounds................ 3-20 3.7.4 Metals by Inductively-Coupled Plasma Spectrometry (ICP).................... 3-20 3.7.5 Metals by Inductively-Coupled Plasma Mass Spectrometry (ICPMS).............................................................................................................. 3-21 3.8. PIEDMONT/BLUE RIDGE AQUIFER SYSTEM......................................... 3-21 3.8.1 Aquifer System Characteristics................................................................. 3-21 3.8.2 Field parameters....................................................................................... 3-23 3.8.3 Major Anions, Non-Metals, and Volatile Organic Compounds................ 3-24 3.8.4 Metals by Inductively-Coupled Plasma Spectrometry (ICP).................... 3-25 3.8.5 Metals by Inductively-Coupled Plasma Mass Spectrometry (ICPMS).............................................................................................................. 3-26 3.9 VALLEY AND RIDGE/APPALACHIAN PLATEAU AQUIFER SYSTEM............................................................................................................. 3-26 3.9.1 Aquifer System Characteristics................................................................ 3-26 3.9.1 Field parameters....................................................................................... 3-27 3.9.3 Major Anions, Non-Metals, and Volatile Organic Compounds................. 3-29 3.9.4 Metals by Inductively-Coupled Plasma Spectrometry (ICP)..................... 3-29 3.9.5 Metals by Inductively-Coupled Plasma Mass Spectrometry (ICPMS).............................................................................................................. 3-29 CHAPTER 4 SUMMARY AND CONCLUSIONS.............................................. 4-1 4.1 PHYSICAL PARAMETERS AND pH...................................................... 4-1 4.1.1 pH............................................................................................................. 4-1 4.1.2 Conductivity............................................................................................. 4-2 4.1.3 Temperature........................................................................... 4-3 Hi 4.2 ANIONS, NON-METALS AND VOCS....................................................... 4-3 4.2.1 Chloride and Fluoride.............................................................................. 4-3 4.2.2 Sulfate................................................................................. 4-3 4.2.3 Nitrate/Nitrite............................................................................................ 4-4 4.2.4 Phosphorus.....................................................................................-...... 4-4 4.2.5 Dissolved Oxygen............................................................................ -...... 4-5 4.2.6 Volatile Organic Compounds................................................................... 4-5 4.3 ICP METALS...................................................... 4-5 4.3.1 Aluminum.......................................... 4-6 4.3.2 Iron and Manganese................................................................................ 4-6 4.3.3 Calcium, Magnesium, Sodium, and Potassium....................................... 4-6 4.4 ICPMS METALS.......................................................................................... 4-8 4.4.1 Chromium and Nickel............................................................................... 4-8 4.4.2 Arsenic, Selenium, Uranium, and Molybdenum...................................... 4-8 4.4.3 Copper, Lead, and Zinc........................................................................... 4-9 4.4.4 Barium..................................................................................................... 4-9 4.5 CONTAMINATION OCCURRENCES........................................................ 4-10 4.5.1 Primary MCL and Action Level Exceedances.............................. .......... 4-10 4.5.2 Secondary MCL Exceedances................................................................ 4-11 4.5.3 Volatile Organic Compounds................................................................... 4-12 4.6 GENERAL QUALITY................................................................................ 4-15 5.0 CHAPTERS LIST OF REFERENCES.................................................... 5-1 iv APPENDIX Laboratory and Station Data.......................................................................... A-1 LIST OF FIGURES Figure 1-1. The Hydroqeologic Provinces of Georgia............................... 1-4 Figure 3-1. The Major Aquifers and Aquifer Systems of the Coastal Plain Province.................................................................................................. 3-2 Figure 3-2. Locations of Stations Monitoring the Cretaceous Aquifer System............................................................................................................... 3-4 Figure 3-3. Location of the Station Monitoring the Clayton Aquifer........ 3-7 Figure 3-4. Locations of Stations Monitoring the Claiborne Aquifer....... 3-9 Figure 3-5. Locations of Stations Monitoring the Jacksonian Aquifer.... 3-11 Figure 3-6. Locations of Stations Monitoring the Floridan Aquifer System............................................................................................................... 3-14 Figure 3-6. Locations of Stations Monitoring the Miocene/Surficial Aquifer System................................................................................................. 3-19 Figure 3-8. Locations of Stations Monitoring the Piedmont/Blue Ridge Aquifer System................................................................................................. 3-22 Figure 3-9. Locations of Stations Monitoring the Vallev-and-Ridqe/ Appalachian Plateau Aquifer System........................................................... 3-28 LIST OF TABLES Table 2-1. Georgia Ground-Water Monitoring Network, Calendar Year 2012................................................................................................................................ *................................................................................................................................. .. .................. 2-2 Table 4-1. Contents of Calcium, Magnesium, and Sodium in Samples by Aquifer, Concentration Mean and Range................................................. 4-7 Table 4-2. Primary MCL and Copper/Lead Action Level Exceedances, Calendar Year 2012.......................................................................................... 4-11 Table 4-3. VOC Contamination Incidents, Calendar Year 2012.................. 4-12 v Table 4-4. VOC Contamination Incidents, Calendar Year 2012................. 4-13 Table A-1. Ground-Water Quality Analyses for Cretaceous/ Providence Stations........................................................................................ A-2 Table A-2. Ground-WaterQuality Analyses for Clayton Stations.............. A-4 Table A-3. Ground-Water Quality Analyses for Claiborne Stations........ A-6 Table A-4. Ground-Water Quality Analyses for Jacksonian Stations.... A-8 Table A-5. Ground-Water Quality Analyses for Floridan Stations......... A-10 Table A-6. Ground-Water Quality Analyses for Miocene Stations.......... A-16 Table A-7. Ground-Water Quality Analyses for Piedmont-Blue Ridge Stations.............................................................................................................. A-18 Table A-8. Ground-Water Quality Analyses for Valley-and-Ridge/ Appalachian Plateau Stations........................................................................... A-22 Table A-9. Analytes, EPA Analytical Methods, and Reporting Limits....... A-24 Table A-10. Analytes, Primary MCLs, and Secondary MCLs......................... A-25 vi CHAPTER 1 INTRODUCTION 1.1 PURPOSE AND SCOPE This report, covering the calendar year 2012, is the twenty-sixth of the Circular 12 series. The first 19 reports, Circulars 12A through 12S, summarized the chemical quality of ground water statewide across Georgia and utilized a static array of sampling stations that were sampled periodically, typically on an semiannual, annual, or biennial basis. The next five reports, Circulars 12T through 12X, dealt with specialized chemical ground-water quality issues: water quality in the Coastal region, water quality available to small public water systems, water quality in the Piedmont/Blue Ridge physiographic province, ground-water uranium in Georgia, and ground-water arsenic in Georgia. With this report and its predecessor, Circular 12Y, monitoring the chemical quality of ground water continues using a static array of periodically sampled stations. These summaries are among the tools used by the Georgia Environmental Protection Division (EPD) to assess trends in the quality of the State's ground-water resources. EPD is the State organization with regulatory responsibility for maintaining and where possible, improving ground-water quality and availability. EPD has implemented a comprehensive statewide ground-water management policy of anti-degradation (EPD, 1991; 1998). Four components comprise EPD's current ground-water quality assessment program: 1. The Georgia Ground-Water Monitoring Network. EPD's Watershed Protection Branch, Source Water Assessment Program, took over the Georgia Ground-Water Monitoring Network from the Regulatory Support Program when that program disbanded. The Monitoring Network is designed to evaluate the ambient ground-water quality of eight aquifer systems present in the State of Georgia. The data collected from sampling of the Ground-Water Monitoring Network form the basis for this report. 2. Water Withdrawal Program (Watershed Protection Branch, Water Supply Section). This program provides data on the quality of ground water that the residents of Georgia are using. 3. Ground-water sampling at environmental facilities such as municipal solid waste landfills, RCRA facilities, and sludge disposal facilities. The primary agencies responsible for monitoring these facilities are EPD's Land Protection and Watershed Protection Branches. 1-1 4. The Wellhead Protection Program (WHP), which is designed to protect areas surrounding municipal drinking water wells from contaminants. The U.S. Environmental Protection Agency (EPA) approved Georgia's WHP Plan on September 30, 1992. The WHP Plan became a part of the 1-1 Georgia Safe Drinking Water Rules, effective July 1, 1993. The protection of public supply wells from contaminants is important not only for maintaining ground-water quality, but also for ensuring that public water supplies meet health standards. Analyses of water samples collected for the Georgia Ground-Water Monitoring Network during the period January 2012 through December 2012 and from previous years form the database for this summary. The Georgia GroundWater Monitoring Network is presently comprised of 80 stations, both wells and springs. Eighteen of the stations are scheduled for quarterly sampling; the remainder are scheduled to be sampled yearly. Each sample receives laboratory analyses for chloride, sulfate, nitrate/nitrite, total phosphorus, 26 metals, and volatile organic compounds (VOCs). Samples from the mineral spring and main well at Indian Springs State Park (stations P12A and P23) also receive analysis for fluoride. Field measurements of pH, conductivity, and temperature are performed on the sample water from each station. Field dissolved oxygen measurements are made on sample water from wells. During the January 2012 through December 2012 period, Ground-Water Monitoring staff collected 141 samples from 74 wells and 6 springs. A review of the data from this period and comparison of these data with those for samples collected for preceding monitoring efforts indicated that ground-water quality at most of the 80 stations has remained good. 1.2 FACTORS AFFECTING CHEMICAL GROUND-WATER QUALITY The chemical quality of ground water is the result of complex physical, chemical, and biological processes. Among the more significant controls are the chemical quality of the water entering the ground-water flow system, the reactions of the infiltrating water with the soils and rocks that are encountered, and the effects of the well-and-pump system. Most water enters the ground-water system in upland recharge areas and areas of leakage from adjacent geologic units. Water seeps through interconnected pore spaces and fractures in the soils and rocks until discharged to a surface water body (e.g., stream, lake, or ocean). The initial water chemistry, the amount of recharge, and the attenuation capacity of soils have a strong influence on the quality of ground water in recharge areas. Chemical interactions between the water and the aquifer host rocks have an increasing significance with longer residence 1-2 times. As a result, ground water from discharge areas tends to be more highly mineralized than ground water in recharge areas. The well-and-pump system can also have a strong influence on the quality of the well water. Well casings, through compositional breakdown, can contribute metals (e.g., iron from steel casings) and organic compounds (e.g., tetrahydrofurans from PVC pipe cement) to the water. Pumps can aerate the water being drawn up and discharged. An improperly constructed or failing well can offer a conduit that allows local pollutants to enter the ground-water flow system 1.3 HYDROGEOLOGIC PROVINCES OF GEORGIA This report defines three hydrogeologic provinces by their general geologic and hydrologic characteristics (Figure 1-1). These provinces consist of: 1. The Coastal Plain Province of south Georgia; 2. The Piedmont/Blue Ridge Province, which includes all but the northwestern corner of north Georgia; 3. The combined Valley and Ridge and Appalachian Plateau Provinces of northwest Georgia. 1.3.1 Coastal Plain Province Georgia's Coastal Plain Province generally comprises a wedge of loosely consolidated sediments that gently dip and thicken to the south and southeast. Ground water in the Coastal Plain flows through interconnected pore space between grains and through solution-enlarged voids in rock. The oldest outcropping sedimentary formations (Cretaceous) are exposed along the Fall Line (Figure 1-1), which is the northern limit of the Coastal Plain Province. Successively younger formations occur at the surface to the south and southeast. The Coastal Plain of Georgia contains a number of confined and unconfined aquifers. Confined aquifers are those in which the readily permeable layer of aquifer medium is interposed between two layers of poorly permeable material (e.g. clay or shale). If the water pressure in such an aquifer exceeds atmospheric pressure, the aquifer is artesian. Water from precipitation and runoff enters the aquifers and aquifer systems in their updip outcrop areas, where permeable sediments hosting the aquifer are exposed. Water may also enter the aquifers downdip 1-3 :atoo: FANNIN UNION RA8UN Appalachian Plateau Province GORDON OILMEN .UMPKIN i SHAM. QARIOWj FORSYTI HALL \ BANKS HART Valley and Ridge Province Piedmont/Blue Ridge Province Coastal Plain Province .BARROW GWINNETT ELBERT DOUGI FULTON CLAY- HEARD \ COWETA HENRY WALTON WILKES \UNCOLN' GREENE / TALIA- > MORGAN \FERRO HAN.COCK :olum< HARRIS MONROE JEFFER. SON WASHINGTON TWIGGS houstonTbleck^ JOHNSON EMANUEL LAURENS SCREVEN BULLOCH DOOLY PULASKI DODGE CRISP WILCOX TURNER JEFF DAVIS CALHOUN \ DOUGHERTY COFFEE EARLY BAKER MILLER MITCHELL BERRIEN \ ATKINSON COLQUITT COOK PIERCE WARE DECATUR GRADY THOMAS BROOKS LOWNDES CLINCH ECHOLS LIBERTY KINTpSl GLYNN Figure 1-1. The Hvdroqeoioqic Provinces of Georgia 1-4 from the recharge areas through leakage from overlying or underlying aquifers. Most Coastal Plain aquifers are unconfined in their updip outcrop areas, but become confined in downdip areas to the south and southeast, where they are overlain by successively younger rock formations. Ground-water flow through confined Coastal Plain aquifers is generally to the south and southeast, in the direction of dip of the sedimentary layers. The sediments forming the major aquifer systems in the Coastal Plain range in age from Cretaceous to Holocene. Horizontal and vertical changes in the sediment layers that form these aquifer systems determine the thickness and extent of the aquifer systems. Several aquifer systems may be present in a single geographic area forming a vertical "stack". The Cretaceous and Jacksonian aquifer systems (primarily sands) are a common source of drinking water within a 35-mile wide band that lies adjacent to and south of the Fall Line. A well has been planned to test the Cretaceous aquifer along the Atlantic coast for water supply development. Southwestern Georgia relies on three vertically stacked aquifer systems plus the upper part of the Cretaceous aquifer system for drinking water supplies: the Clayton, the Claiborne, and the Floridan aquifer systems. The Miocene/Surficial aquifer system (primarily sands) is the principal shallow aquifer system occupying much of the same broad area occupied by the Floridan aquifer system in central and eastern Georgia. The system is unconfined over most of its inland extent, but becomes in part confined both in the coastal area and in Grady, Thomas, Brooks, and Lowndes County area of South Georgia. 1.3.2 Piedmont/Blue Ridge Province Though the Piedmont and Blue Ridge Physiographic Provinces differ geologically and geomorphologically, the two physiographic provinces share common hydrogeological characteristics and thus can be treated as a single hydrogeologic province. A two-part aquifer system characterizes the Piedmont/Blue Ridge Province (Daniel and Harned, 1997). The upper part of the system is the regolith aquifer, composed of saprolite and overlying soils and alluvium. The regolith aquifer is unconfined, and the water resides primarily in intergranular pore spaces (primary porosity). The lower aquifer in the Piedmont/Blue Ridge aquifer system is the bedrock aquifer. This aquifer is developed in metamorphic and igneous bedrock (mostly Paleozoic and Precambrian in age), and the water resides in fractures and solution-enlarged voids (secondary porosity). In contrast to the regolith aquifer, no intergranular (primary) porosity exists in the bedrock aquifer. The bedrock aquifer is semi-confined, with the overlying regolith aquifer media offering local confinement. The regolith aquifer also serves as the reservoir that recharges the bedrock aquifer. 1-5 1.3.3 The Valley and Ridge Province Consolidated Paleozoic sedimentary formations characterize the Valley and Ridge Province. The principal porosity present in aquifer media consists of fractures and solution-enlarged voids; intergranular porosity may be important in some places. Locally, ground-water and surface-water systems closely interconnect. Dolostones and limestones of the Knox Group are the principal aquifers where they occur in fold axes at the centers of broad valleys. The greater hydraulic conductivities of the thick carbonate sections in this province permit higher yielding wells than in the Piedmont/Blue Ridge Province. 1.3.4 The Appalachian Plateau Province Rocks in this province consist of consolidated Paleozoic sediments inclusive of the Mississippian and Pennsylvanian. Faulting and folding are less intense than in the Valley and Ridge province, and sediments tend to be flatter lying and more continuous areally. As in the Valley and Ridge Province, secondary porosity is the most important type of porosity. The highly fractured Fort Payne Chert and the Knox Group are major water-bearing units in this province. Only a small part of this province extends into Georgia, at the State's far northwest corner (Dade County and parts of Chattooga and Walker Counties). Due to its small extent in Georgia and its lack of monitoring stations for the current project, the Appalachian Plateau Province is combined with the Valley and Ridge Province for the purposes of this report. 1.4 REGIONAL GROUND-WATER PROBLEMS Data from ground-water investigations in Georgia, including those from the Ground-Water Monitoring Network, indicate that virtually all of Georgia has shallow ground water sufficient for domestic supply. Iron, aluminum, and manganese are the only constituents that occur routinely in concentrations exceeding drinking water standards. These metals are mostly naturally occurring and do not pose a health risk. Iron and manganese can cause reddish or yellowish-brown to dark brown or black stains on objects and can give water a bitter metallic taste. Aluminum can cause water to appear cloudy. In the karstic carbonate terranes of the combined Valley and Ridge/ Appalachian Plateau Province, interconnection between the surface water systems and the ground-water systems can be extensive enough such that waters supplying some wells and springs (e.g., Crawfish Spring and Cedartown Spring) have been deemed under direct surface influence, requiring surface water type treatment if used for public supplies. 1-6 In the Piedmont/Blue Ridge Province, water available to wells drilled into bedrock consisting of granitic intrusive rocks, granitic gneisses, or hornblende gneiss/amphibolite assemblages occasionally may contain excessive naturally occurring uranium. Aquifers in the outcrop areas of Cretaceous sediments south of the Fall Line typically yield acidic water that may require treatment. The acidity occurs naturally and results from the inability of the sandy aquifer sediments to neutralize acidic rainwater and from biologically influenced reactions between infiltrating water and soils. Ground-water from the Cretaceous aquifer along the coast is typically brackish. Nitrate/nitrite concentrations in shallow ground water from the farm belt in southern Georgia are usually within drinking water standards, but are somewhat higher than levels found in other areas of the State. Three areas of naturally reduced ground-water quality occur in the Floridan aquifer system. The first is the karstic Dougherty Plain of southwestern Georgia. The second is the Gulf Trough area. The third is in the coastal area of east Georgia. In the Dougherty Plain, as with the carbonate terranes of northwestern Georgia, surface waters and the contaminants they entrain can directly access the aquifer through sink holes. The Gulf Trough is a linear subsurface geologic feature extending from southwestern Decatur County through northern Effingham County and may represent a filled-in marine current channel way (Huddleston, 1993). Floridan ground water in and near the trough may be high in total dissolved solids and may contain elevated levels of sulfate, barium, radionuclides, and arsenic (Kellam and Gorday, 1990; Donahue et al., 2013). In the Coastal area of east Georgia, the influx of water with high dissolved solids contents can dramatically raise levels of sodium, calcium, magnesium, sulfate, and chloride. In the Brunswick part of the Coastal area, ground-water withdrawal from the upper Floridan results in the upwelling of ground water with high dissolved solids content from the deeper parts of the aquifer system (Krause and Clarke, 2001). In the Savannah portion of the Coastal area, heavy pumping in and around Savannah has caused a cone of depression which has induced seawater to enter the Floridan aquifer system and to flow down-gradient toward Savannah. The seawater has not yet reached Savannah and may not for many years. The seawater then enters the aquifer system via breaches in the Miocene confining unit along the bottoms of waterways and sand-filled paleochannels offshore at the Beaufort/Hilton Head area of South Carolina (Foyle et al., 2001; Krause and Clarke, 2001). 1-7 CHAPTER 2 GEORGIA GROUND-WATER MONITORING NETWORK 2.1 MONITORING STATIONS For the period January 2012 through December 2012, attempts were made to place sampling stations in the Coastal Plain Province's six major aquifer systems, in the Piedmont/Blue Ridge Province, and in the Valley and Ridge/Appalachian Plateau Province (Table 2-1). Stations are restricted to wells or springs tapping a single aquifer or aquifer system. Attempts were made to have some monitoring stations located in the following critical settings: 1. areas of recharge; 2. areas of possible pollution or contamination related to regional activities (e.g., agricultural and industrial areas) or to hydrogeologic settings (e.g., granitic intrusions, Dougherty Plain); 3. areas of significant ground-water use Most of the monitoring stations are municipal, industrial, and domestic wells that have well construction data. 2.2 USES AND LIMITATIONS Regular sampling of wells and springs of the Ground-Water Monitoring Network permits analysis of ground-water quality with respect to location (spatial trends) and time of sample collection (temporal trends). Spatial trends are useful for assessing the effects of the geologic framework of the aquifer and regional landuse activities on ground-water quality. Temporal trends permit an assessment of the effects of rainfall and drought periods on ground-water quality and quantity. Both trends are useful for the detection of non-point source pollution. Non-point source pollution arises from broad-scale phenomena such as acid rain deposition and application of agricultural chemicals on crop lands. It should be noted that the data of the Ground-Water Monitoring Network represent water quality in only limited areas of Georgia. Monitoring water quality at the 80 sites located throughout Georgia provides an indication of ground-water quality at the locality sampled and at the horizon corresponding to the open interval in the well or to the head of the spring at each station in the Monitoring Network. Caution should be exercised in drawing unqualified conclusions and applying any results reported in this study to ground waters that are not being monitored. 2-1 Table 2-1. Georgia Ground-Water Mt^f' hha //t*fH**O *> I // \ BLUE RIDGE/ \ .Mtmy / ------ ^ ,/ 1 A-^v JAI WovuK nwr' . "T i r* \ "^r^ ' \ r\' iWf BCWV -' "" >^A^yuB>wr>--7V _ '^n"w ii..irc^m..j| wha v^M-fn 'w. V:*/'-^ yvy.CTH)FI ' T\ _L 1 N / ^'"r K"'A_ /Um\,*46^ Ip . ... fjc<yM.,,.,c-^ / PIEDMONT' >y V-A \ ~- ...'C-Wi \---------- -./ r. r-r,J> P ' UwoV j-- [fw-:'' ' .- kKAMCTMy * --' ^ 1-----------J-- . '**' ^ tC-XA*^ / CLAIBORNE CLAYTON A CLAIBORNE FLORIDAN Figure 3-1. The Major Aquifers and Aquifer Systems of the Coastal Plain Province (after Davis, 1990). 3-2 enhance porosity and permeability and exert a strong influence on local flow patterns. 3.2 CRETACEOUS AQUIFER SYSTEM 3.2.1 Aquifer System Description The Cretaceous aquifer system is a complexly interconnected group of aquifer subsystems developed in the late Cretaceous sands of the Coastal Plain Province. These sands crop out in an extensive recharge area immediately south of the Fall Line in west and central Georgia (Fig. 3-2). In east Georgia, overlying Tertiary sediments restrict Cretaceous outcrops to valley bottoms. Five distinct subsystems of the Cretaceous aquifer system, including the Providence aquifer, are recognized west of the Ocmulgee River (Pollard and Vorhis, 1980). These merge into three subsystems to the east (Clarke et al, 1985; Fluddlestun and Summerour, 1996). The aquifer thickens southward from the Fall line, where the clays and sands pinch out against crystalline Piedmont rocks to a column approximately 2,000 feet thick or more at the southern limits of the main aquifer use area (limit of current utilization, Figure 3-2). The Providence aquifer, a prominent subsystem of the Cretaceous aquifer system in the western Coastal Plain, is developed in sands and coquinoid limestones at the top of the Cretaceous column. The permeable Providence Formation-Clayton Formation interval forms a single aquifer in the updip areas (Long, 1989) and to the east of the Flint River (Clarke et al., 1983). East of the Ocmulgee River, this joint permeable interval is termed the Dublin aquifer (Clarke et al., 1985). This report considers the Providence aquifer as a part of the Cretaceous aquifer system. EPD used 12 wells to monitor the Cretaceous aquifer system. Reported depths ranged from 128 feet (Jones Co. #4, K7) to 1025 feet (Blakely #4, PD6). All except KaMin #6 (K6) are local government owned public supply wells. KaMin #6 produces process water for a kaolin mill. All wells are sampled yearly. 3.2.2 Field parameters The pHs of sample waters from all 12 wells ranged from 3.90 (K12) to 8.38 (PD6). As a rule, pHs of waters from the deeper wells are basic, while those from shallower wells are acidic. Well PD3 seems to be the exception. Its sampling pH of 8.37 would be expected for a well about twice its reported depth of 456 feet. Conductivities are available for all 12 wells and ranged from 10 uS/cm (K10B) to 355 uS/cm (PD3), with a median of 39 uS/cm. As a rule, the deeper wells gave water with the higher conductivities. Again, well PD3 was the exception. 3-3 PD6 General recharge area (from Davis et al., 1989) Sampling station Figure 3-2. Locations of Stations Monitoring the Cretaceous Aquifer System. 3-4 The temperatures measured should be viewed as approximations of the temperature of the water in the aquifer. Temperatures over all 12 wells ranged from 17.7 degrees C (K7) to 28.9 degrees C (K20). Comparing well depths with sample water temperatures shows that the deeper wells generally tend to yield water with higher temperatures. The water temperature can also depend somewhat on the time of year measured, since sample water must traverse a zone influenced by surface temperature on its way from the aquifer to the measurement point. Dissolved oxygen measurements are available for 11 of the 12 wells. Concentrations ranged from 0.01 mg/L (K9A) up to 8.00 mg/L (K19). Generally, the dissolved oxygen content of ground water decreases with depth. Dissolved oxygen measurements can suffer from various interferences, processes that can expose the ground water to air. An inadequately purged well may deliver water that has been in contact with air in the well bore. Pumping a well's water level down near the pump intake can entrain air in the pumped water. Also, pumping the water level in the well below a recharging horizon allows water to "cascade" or fall freely down the well bore and splash, thereby becoming aerated. 3.2.3 Major Anions, Non-Metals, and Volatile Organic Compounds Testing for chloride, sulfate, combined nitrate/nitrite, total phosphorus, and volatile organic compounds (VOCs) was done for samples from all 12 wells. Detectable chloride, at a concentration of 10 mg/L, occurred only in a sample from well PD3. Sulfate was detected in samples from four wells, with concentrations all at or below 13 mg/L. Nitrate/nitrite, detected in eight samples from seven wells ranged from not detectable to 1.8 mg/L. Samples from seven wells contained detectable phosphorus, with concentrations ranging up to 0.43 mg/L. 3.2.4 Metals by Inductively-Coupled Plasma Spectrometry (ICP) All 12 samples contained detectable sodium, which ranged from 1,000 ug/L at two wells (K9A, K12) to 83,000 ug/L (PD3). Three wells - K20, PD3, and PD6 gave samples with sodium contents an order of magnitude higher than the remainder of the wells. Two of these, K20 and PD6, were also the two deepest wells. A high reporting limit attends the laboratory's current procedure for analyzing potassium and contributes to the lack of potassium detections. Five wells gave samples with detectable aluminum, with concentrations up to 490 ug/L (K9A). Seven samples from seven wells contained detectable calcium, and, eight samples from seven wells contained detectable iron. Calcium levels ranged up to 22,000 ug/L (K3). Iron levels ranged up to 650 ug/L (K6) with five wells giving samples exceeding the Secondary MCL of 300 ug/L. Samples from four wells contained detectable magnesium, with a maximum value of 4,200 ug/L 3-5 (PD6). Four wells gave samples with detectable manganese. None exceeded the Secondary MCL of 50 ug/L. Beryllium, cobalt, potassium, vanadium, and titanium were undetected. 3.2.5 Metals by Inductively-Coupled Plasma Mass Spectrometry (ICPMS) ICPMS analysis found only copper, zinc, barium, lead, and uranium. Barium was detected in samples from all wells except K20, with a maximum concentration of 28 ug/L (K3). Lead was detected in seven samples from six wells, with a concentration range up to 29 ug/L (K12). In addition to the exceedance for well K12, the lead concentration in the sample from well K19 also exceeded the action level of 15 ug/L. The K19 exceedance seems to have resulted from entrainment of a corrosion film on a little-used spigot into the sample water. Copper was detected in six samples from six wells and ranged in concentration up to 48 ug/L (K9A). Zinc was detected in five samples from four wells, at levels up to 180 ug/L (K19). A follow-up sample taken from a different spigot on well K19 registered a lead concentration of 1.2 ug/L, a zinc concentration of 14 ug/L, and no detectable copper. Copper, lead, and zinc are commonly introduced into sample water from plumbing and are not necessarily present naturally. Uranium was detected in one sample (K6) at a level of 1.1 ug/L. 3.3 CLAYTON AQUIFER The Clayton aquifer of southwestern Georgia is developed mainly in the middle limestone unit of the Paleocene Clayton Formation. Limestones and calcareous sands of the Clayton aquifer crop out in a narrow belt extending from northeastern Clay County to southwestern Schley County (Figure 3-3). Aquifer thickness varies, ranging from about 50 feet in the outcrop area to 265 feet in southeastern Mitchell County (Clarke et al., 1984). Both the Flint River to the east and the Chattahoochee River, to the west are the areas of discharge for the aquifer in its updip extent. Leakage from the underlying Providence aquifer and from overlying permeable units in the Wilcox Formation confining zone provides significant recharge in downdip areas (Clarke et al., 1984). As mentioned previously, permeable portions of the Clayton and Providence Formations merge to form a single aquifer in the updip area and east of the Ocmulgee River. East of that river these combined permeable zones are called the Dublin aquifer. Only one well (CT8), an 80-foot deep domestic well, was available to monitor the Clayton aquifer. The well is sampled yearly. The well water had a pH of 4.27, an electrical conductivity of 45 uS/cm, and a temperature of 18.2 degrees C. Dissolved oxygen was 7.90 mg/L and nitrate/nitrite registered at 2.1 mg/L as nitrogen. The water contained sodium at a level of 3,400 ug/L, magnesium at a level of 1,100 ug/L, aluminum at a level of 120 ug/L, and manganese at a level of 26 3-6 Figure 3-3. Location of the Station Monitoring the Clayton Aquifer. 3-7 ug/L. Copper at a concentration of 20 ug/L, lead at a level of 5.6 ug/L, and barium at a concentration of 26 ug/L were the trace metals detected. Copper and lead were probably leached from plumbing. 3.4 CLAIBORNE AQUIFER 3.4.1 Aquifer Description The Claiborne aquifer is developed primarily in the sandy units in the middle and lower portion of the Middle Eocene Claiborne Group of southwestern Georgia. Claiborne Group sands crop out in a belt extending from northern Early County through western Dooly County. Recharge to the aquifer occurs both as direct infiltration of precipitation in the recharge area and as leakage from the overlying Floridan aquifer system (Hicks et al., 1981; Gorday et al., 1997). The discharge boundaries for the updip portion of the aquifer are the Ocmulgee River to the east and the Chattahoochee River to the west. The aquifer is more than 350 feet thick near its downdip limit of utilization (Figure 3-4) (Tuohy, 1984). The aquifer generally thickens to the southeast. The clay-rich upper portion of the Claiborne Group, the Lisbon Formation, acts as a confining layer and separates the Claiborne aquifer from the overlying Floridan aquifer system (McFadden and Perriello, 1983; Long, 1989; Huddlestun and Summerour, 1996). The lower, water-bearing parts of the group had been correlated with the Tallahatta Formation (e.g., McFadden and Perriello, 1983; Long, 1989: Clarke et al., 1996) or more recently, have been divided into two formations, the upper one termed the Still Branch Sand and the lower one correlated to the Congaree Formation (Huddlestun and Summerour, 1996). East of the Ocmulgee River, permeable Congareeequivalent sands are included in the Gordon aquifer (Brooks et al., 1985). Three stations, all in or near the recharge area, were available to monitor the Claiborne aquifer. Wells CL2 and CL4A are municipal public supply wells, and, well CL8 supplies water for drinking and other purposes for a State tree nursery. Well CL2 is 315 feet deep, CL4A is 230 feet deep, and CL8 is about 90 feet deep. 3.4.2 Field parameters The pHs of sample waters from two wells was mildly acidic (CL8 at 6.20 and CL4A at 6.78) while the third was mildly basic (CL2 at 7.54). Conductivities registered at 53 uS/cm (CL8), 98 uS/cm (CL4A), and 127 uS/cm (CL2); and, temperatures registered at 19.8 degrees C (CL4A), 20.3 degrees C (CL2), and 20.7 degrees C (CL8). Dissolved oxygen contents measured at 0.02 mg/L (CL8) and 3.10 mg/L (CL2). Collecting a sample from well CL4A exposes the sample water to air; therefore water from CL4A received no dissolved oxygen measurement. 3-8 40 MILES General recharge area (from Davis et al., 1989) Sampling station Figure 3-4. Locations of Stations Monitoring the Claiborne Aquifer. 3-9 3.4.3 Major Anions, Non-Metals, and Volatile Organic Compounds None of the samples contained detectable chloride. The sample from well CL2 contained a little chloroform (0.55 ug/L). The sample from well CL4A contained 12 mg/L sulfate. Well CL2 gave a sample with a nitrate/nitrite concentration of 0.41 mg/L as nitrogen. The other two wells gave waters with no detectable nitrate/nitrite. Samples from two wells contained detectable phosphorus (CL4A at 0.35 mg/L, CL8 at 0.51 mg/L). 3.4.4 Metals by Inductively-Coupled Plasma Spectrometry (ICP) Calcium and sodium were detected in samples from all three wells. The maximum and minimum calcium concentrations were 39,000 ug/L and 12,000 ug/L (CL2 and CL8). The maximum and minimum sodium concentrations were 1,900 ug/L (CL8) and 1,700 ug/L (CL2 and CL4A). Detectable magnesium occurred in samples from wells CL4A (3,000 ug/L) and CL8 (1,200 ug/L). Wells CL4A and CL8 both gave samples containing detectable iron and manganese. With iron levels of 1,800 ug/L for the CL4A sample and 650 ug/L for the CL8 sample and waters from both wells exceeded the 300 ug/L Secondary MCL for iron. Likewise, the manganese levels of 56 ug/L for CL4A and 51 ug/L for CL8 both exceeded the Secondary MCL for that metal of 50 ug/L. 3.4.5 Metals by Inductively-Coupled Plasma Mass Spectrometry (ICPMS) ICPMS analyses found no trace metals other than barium in any of the samples. Barium levels were 11 ug/L for the CL2 sample, 12 ug/L for the CL4A sample, and 36 ug/L for the CL8 sample. 3.5 JACKSONIAN AQUIFER 3.5.1 Aquifer Description The Jacksonian aquifer (Vincent, 1982) of central and east-central Georgia is developed primarily in sands of the Eocene Barnwell Group, though isolated limestone bodies are locally important. Barnwell Group outcrops extend from Macon and Crawford Counties (Hetrick, 1990) eastward to Burke and Richmond Counties (Hetrick, 1992). Figure 3-5 shows the extent and most significant Jacksonian recharge areas. Aquifer sands form a northern clastic facies of the Barnwell Group; the sands grade southward into less permeable silts and clays of a transition facies (Vincent, 1982). The water-bearing sands are relatively thin, ranging from 10 to 50 feet in thickness. Limestones equivalent to the Barnwell 3-10 40 MILES CLASTIC FACIES General recharge area (from Davis et al., 1989) Sampling station Figure 3-5. Locations of Stations Monitoring the Jacksonian Aquifer. 3-11 Group form a southern carbonate facies and are included in the Floridan aquifer system. The Savannah River and the Flint River are the eastern and western discharge boundaries for the updip parts of the Jacksonian aquifer. The Jacksonian aquifer is equivalent to the Upper Three Runs aquifer, as discussed by Summerour et al. (1994), page 2, and Williams (2007), "General Flydrogeology" table. Five wells were available to monitor the Jacksonian aquifer. Wells J1B and J8A are domestic wells, while wells J4, J5, J6 are public supply wells. All are drilled wells, and, each is scheduled for yearly sampling. Well J8A was adopted as a substitute, replacing well J8 while it is down for maintenance. 3.5.2 Field parameters The phis for all wells except J6 were slightly basic, ranging from 7.13 (J1B) to 7.50 (J5). Well J6 was barely acidic at 6.97. Conductivities ranged from 212 uS/cm (J5) to 296 uS/cm (J8A). Temperatures ranged from 19.0 degrees C for J8A to 20.5 degrees C for J5, with water from the deeper wells registering higher temperatures. Dissolved oxygen concentrations ranged from 0.00 mg/L for well J5 to 5.98 mg/L for J1B and were lowest in the deeper wells. 3.5.3 Major Anions, Non-Metals, and Volatile Organic Compounds No sample waters contained detectable volatile organic compounds. Chloride was detected in sample water only from well J1B (10 mg/L). Sample waters from wells J5 and J6 contained detectable sulfate (both 12 mg/L). Nitrate/nitrite was detected in samples from wells J1B (2.6 mg/L as nitrogen), J4 (0.06 mg/L as nitrogen), and J8A (0.04 mg/L as nitrogen), all measurements below the human-influenced range of greater than 3 mg/L as nitrogen. Phosphorus was detected in water from all wells and ranged from 0.03 mg/L (J4 and J8A) to 0.15 mg/L (J6). 3.5.4 Metals by Inductively-Coupled Plasma Spectrometry (ICP) All five wells gave waters with detectable calcium, with a rather tight range from 50,000 ug/L (J4 and J6) to 66,000 ug/L (J5). Magnesium ranged from undetected (J1B) to 2,600 ug/L (J4). Detectable sodium occurred in each well and ranged in concentration from 1,900 ug/L (J6) to 4,500 ug/L (J1B). Well J6 gave a sample containing 150 ug/L iron; and, well J8A gave a sample containing 22 ug/L manganese. According to a rule set forth in Kellam and Gorday (1990), all of these wells derive most of their recharge from local surface water. 3.5.5 Metals by Inductively-Coupled Plasma Mass Spectrometry (ICPMS) All five wells yielded waters containing detectable barium, with a range from 7.5 ug/L (J6) to 21 ug/L (J1B). The only other detectable metal found with ICPMS 3-12 was copper, with a level of 6.6 ug/L in water from well J4. The copper was likely leached from well plumbing. 3.6 FLORIDAN AQUIFER SYSTEM 3.6.7 Aquifer System Description The Floridan aquifer system is developed predominantly in Eocene and Oligocene limestones and dolostones that underlie most of the Coastal Plain Province (Figure 3-7). The aquifer is a major source of ground water for much of its outcrop area and throughout its downdip extent to the south and east. The upper water-bearing units of the Floridan are the Eocene Ocala Group and the Oligocene Suwanee Limestone (Crews and Huddlestun, 1984). These limestones crop out in the Dougherty Plain (a karstic area in southwestern Georgia) and in adjacent areas along strike to the northeast. In parts of Camden and Wayne Counties, the Oligocene unit is absent, and, the upper portions of the Floridan are restricted to units of Eocene age (Clarke et al., 1990). The lower parts of the Floridan consists mainly of dolomitic limestone of middle and early Eocene age and pelletal, vuggy, dolomitic limestone of Paleocene age but extends into the late Cretaceous in Glynn County. The lower portions of the Floridan are hydrologically continuous with the upper parts but are deeply buried and not widely used, except for several municipal and industrial wells in the Savannah area (Clarke et al., 1990). From its updip limit, defined by clays of the Barnwell Group, the aquifer system thickens to well over 700 feet in coastal Georgia. A dense limestone facies along the trend of the Gulf Trough locally limits ground-water quality and availability (Kellam and Gorday, 1990; Applied Coastal Research Laboratory, 2001). The Gulf Trough is probably a filled marine-current channel that extends from southwestern Decatur County through northern Effingham County. A ground-water divide separates a smaller southwestward flow regime in the Floridan aquifer system in the Dougherty Plain in southwestern Georgia from the large southeastward flow regime in the remainder of the State. Rainfall infiltration in outcrop areas and downward leakage from extensive surficial residuum recharge the Dougherty Plain flow system (Hayes et al., 1983). The main body of the Floridan aquifer system to the east is recharged by leakage from the Jacksonian aquifer system and by rainfall infiltration in outcrop areas and in areas where overlying strata are thin. Significant recharge also occurs in the area of Brooks, Echols, Lowndes, Cook, and Lanier Counties, where the Withlacoochee River and numerous sinkholes breach the upper confining units (Krause, 1979). Monitoring water quality in the Floridan aquifer system made use of 28 wells, with 18 scheduled for sampling on a yearly basis and 10 on a quarterly basis. The total number of samples collected from the wells was 58, including a repeat sample 3-13 PA16 PA44 'A 8.4 A PA 57 PA 6 PA22 General recharge area (from Davis et al., 1989) Sampling station Figure 3-6. Locations of Stations Monitoring the Floridan Aquifer System, 3-14 (PA6) and a cancelled quarterly sample (PA44). All 28 wells are drilled wells. Twenty four wells are local-government-owned public supply wells. Two wells supply industrial process water. One remaining well (PA49) is a domestic-type well supplying a church and a pastorium, and the other (PA9C) is a former USGS test well. Depths range from 97 feet (PA49) to 1,211 feet (PA9C). 3.6.2 Field parameters Measurements of pH are available for all samples and ranged from 6.59 (PA25) to 8.10 (PA49). Conductivities are also available for all samples and ranged from 120 uS/cm (PA44) to 492 uS/cm (PA28). Temperatures are available for all sampling events and ranged from 18.9 degrees C for well PA17 to 26.3 for well PA9C. Well PA9C is the deepest of the Floridan wells at 1211 feet, so the high temperature reflects the geothermal effect. Forty-six dissolved oxygen measurements are available from 26 wells. The available measurements range from 0 mg/L to 7.38 mg/L. At some stations, dissolved oxygen measurements were not taken because of instrument problems. No measurement was taken at well PA14A because the raw water outlet is such that exposure of monitoring/sampling water to air cannot be avoided. 3.6.3 Major Anions, Non-Metals, and Volatile Organic Compounds Five Floridan wells yielded 10 samples containing detectable chloride. Chloride concentrations ranged from undetected to 760 mg/L (PA9C). The measurement for well PA9C is more than 16 times the next highest concentration of 45 mg/L for well PA4. Well PA9C derives water from the lower part of the Floridan aquifer. Twenty five samples from 12 wells gave samples containing detectable sulfate. Levels ranged from undetected to 270 mg/L (PA9C). Twenty water samples from 12 wells contained detectable nitrate/nitrite. Concentrations ranged from undetected to 2.3 mg/L as nitrogen (PA49). There is a general tendency for shallower wells to give samples with higher levels of nitrate/nitrite. Nitrate/nitrite levels in the samples from each quarterly sampled well tend, as a rule, to be similar to one another. Phosphorus was detected in 27 samples from 18 wells. Phosphorus levels ranged up to 0.06 mg/L (PA20) as total phosphorus. Volatile organic compounds (VOCs) were detected in seven samples from four wells (PA16, PA17, PA23, and PA44). VOCs of the trihalomethane family were found for three wells, with the detections in PA44 probably being maintenance related and in PA17 and PA23 probably being reflux related. For PA44, trihalomethanes were found exclusively in a sample taken shortly after maintenance 3-15 was performed. For PA17 and PA23, trihalomethanes tend to be found in samples taken at any time, suggestive of leaky well plumbing valves that allow treated water to flow back down the well. The VOC found in the PA16 sample was a chlorinated alkene, not a disinfection byproduct, and indicative of solvent contamination. 3.6.4 Metals by Inductively-Coupled Plasma Spectrometry (ICP) ICP analyses found detectable levels of potassium, aluminum, manganese, iron, calcium, magnesium and sodium. Detectable potassium occurred in only one sample (PA9C). Failure to find detectable potassium in other samples results from the insensitivity of the testing procedure, as indicated by the high reporting limit (5,000 ug/L) for the metal. Detectable aluminum was found in four samples from four wells. The levels lie within the 50 ug/L to 200 ug/L Secondary MCL range. Detectable manganese occurred in 15 samples from six wells. The maximum concentration of 100 ug/L occurred in a sample from well PA34A. All four samples from quarterly-sampled well PA34A and samples from annually sampled wells PA16 and PA18 exceeded the Secondary MCL of 50ug/L. The manganese levels in the samples from each of the quarterly sampled wells vary within a restricted range. Wells giving samples with manganese detections seem clustered in an area in the east-central and south-central portions of the State (Cook, Irwin, Telfair Toombs, Jenkins, and Candler Counties). Iron was detected in 20 samples from 12 wells. Only one sample, the annual sample from well PA9C, exceeded the Secondary MCL of 300 ug/L. The iron contents of samples from three quarterly wells (PA29, PA34A, and PA36) varied within restricted ranges, while iron contents of samples from quarterly well (PA23) varied considerably. Detectable magnesium was found in all samples from all wells except for those from quarterly well PA25 and annual well PA49. Magnesium concentrations ranged up to 74,000 ug/L. Both PA25 and PA49 are Floridan recharge area wells. Kellam and Gorday (1990) have noted that Ca/Mg ratios are higher in ground waters from Floridan recharge areas, as is the case with these two wells. Magnesium levels in samples from each quarterly well seem to vary within relatively narrow ranges. Calcium was detected in all samples from the 28 Floridan wells. Concentrations ranged from 23,000 ug/L (PA2) to 100,000 ug/L (PA9C). For samples from quarterly wells, calcium concentrations seem to fall within a narrow range for each well. Ca/Mg ratios in well waters have already been mentioned. 3-16 Sodium was also found in all sample waters from all 28 wells and ranged in concentration from 1,800 ug/L (PA49) to 400,000 ug/L (PA9C). Sodium concentrations generally increase with depth. 3.6.5 Metals by Inductively-Coupled Plasma Mass Spectrometry (ICPMS) ICPMS analysis found the following detectable metals in the Floridan samples: chromium, copper, zinc, arsenic, selenium, molybdenum, barium, uranium, lead. A single sample from quarterly well PA23 gave an arsenic detection below the Primary MCL (10 ug/L). The well has given intermittent samples with detectable arsenic before. Two wells, annual well PA49 and quarterly well PA44, gave two samples with detectable chromium below the Primary MCL (100 ug/L). This same sample from well PA44 was the only sample from that well to register trihalomethane detections. Annual well PA9C gave a sample showing detectable selenium below the Primary MCL (50 ug/L). Three samples contained detectable copper, below the action level of 1,300 ug/L. Two were from quarterly wells PA14A and PA36, and, one from annual well PA31. Well PA14A uses a small diameter copper tube for delivering sample water. Four quarterly wells and one annual well each gave one sample with detectable lead. All were below the action level of 15 ug/L. Two wells, annual well PA49 and quarterly well PA25, each gave a sample with detectable zinc. The levels were well below the Secondary MCL (5,000 ug/L). Three quarterly wells, all from the Gulf Trough area, gave samples with detectable molybdenum. Wells PA23 and PA56 each gave four samples containing the metal, while only one of the samples from well PA28 contained a detectable amount. Uranium was detected in 10 samples from two quarterly wells (PA44, PA56) and three annual wells (PA22, PA31, PA39). The maximum concentration was 3.2 ug/L for well PA56, below the Primary MCL of 30 ug/L. Barium was detected in all samples from all wells and ranged in concentration from 3.9 ug/L to 190 ug/L, all below the Primary MCL of 2,000 ug/L. Barium seems to be more abundant in samples from wells of 400 foot to 700 foot depth range. 3-17 3.7 MIOCENE/SURFICIAL AQUIFER SYSTEM 3.7.1 Aquifer System Characteristics The Miocene/Surficial aquifer system is developed in sands of the Miocene Hawthorne Group and of the Pliocene Miccosukee and Cypresshead Formations of the Georgia Coastal Plain (Figure 3-6). The Hawthorne Group covers most of the Coastal Plain and consists predominantly of sand and clay (Huddlestun, 1988), although carbonate rocks and phosphorites may locally be significant (Huddlestun, 1988; Clarke et al., 1990). Clarke et al., 1990, note that three sequences consisting of a basal dense phosphatic limestone layer, a middle clay layer, and an upper sand layer typify the Miocene section in the coastal area. The sand layers of two lowermost of these sequences host the lower and upper Brunswick aquifers, while the uppermost layer is hydraulically continuous with the Surficial aquifer. The Miocene/Surficial aquifer system of this report includes the two lower Miocene layers as well as the upper Miocene layer and the overlying sediments. The Cypresshead Formation overlies the Hawthorne Group in the Coastal area (from the Atlantic coast to about 45 miles inland) and consists, in updip areas, predominantly of fine- to coarse-grained quartz sand and, in downdip areas, interbedded fine sand and clay (Huddlestun, 1988). In the Coastal Plain of far south central and southwestern Georgia, the Miccosukee Formation overlies the Hawthorne Group (Huddlestun, 1988). The Miccosukee Formation consists predominantly of sand but contains some clay. The characteristic lithology consists of thin-bedded to laminated fine to medium sand with scattered layers or laminae of clay. Also included in the aquifer system are Pleistocene arkosic sands and gravels interbedded with clays and Holocene sands and gravels interbedded with muds. The upper part of the aquifer system is unconfined, whereas, the deeper parts of the system may be locally confined and under artesian conditions. Six wells -- MI1, MI2A, MI9A, MI10B, MI16 and MI17 --were used to monitor the Miocene/Surficial aquifer system. All are sampled once per year. Wells MM, MI2A, MI9A and MI10B are private domestic wells, with MI9A and MI10B no longer being used as drinking water sources. Ml 16 is used for general purposes at a fire station. MI17 originated as a geologic bore hole that became a flowing well. It is currently used both as a domestic water source and as an augmentation well for maintaining a pond. MI2A and MI9A are bored wells. The remainder are drilled wells. Depths, actual or approximate, have been determined for all six wells. All wells are sampled yearly. 3-18 40 MILES I General recharge area (from O'Connell and Davis, 1991) Sampling station Figure 3-6 Locations of Stations Monitoring the Miocene/Surficial Aquifer System. 3-19 3.7.2 Field parameters The pHs of the sample waters from the six wells used to monitor the Miocene/Surficial aquifer system ranged from 4.39 (MI2A) to 7.74 (MM). Three of the six wells sampled (MI2A, MI9A, and MI10B) produced acidic water. The remaining three (MI1, Ml 16, and Ml 17) gave basic water. The acidic water-yielding wells included the two shallowest, while the basic water-producing wells included the two deepest. Conductivities ranged from 69 uS/cm (MM OB) to 317 uS/cm (Ml 16). Water temperatures ranged from 19.2 degrees C (Ml 17) to 23.9 degrees C (Ml 16). The 23.6 degrees C temperature probably has a geothermal component, as well Ml 16 is 400 feet deep. Dissolved oxygen data are available for four wells and range from 0.00 (MI17) to 6.70 (MI2A). Valid dissolved oxygen measurements cannot be made on well MI9A since it must be sampled with a bailer. 3.7.3 Major Anions, Non-Metals, and Volatile Organic Compounds Chloride was detected in samples from the two bored wells MI2A (13 mg/L) and MI9A (10 mg/L). The sample from the deepest Miocene well, Ml 16, provided the only sulfate detection, at 35 mg/L. Nitrate/nitrite was detected in sample waters from three wells. The two bored wells, MI2A and MI9A, gave samples with nitrate/nitrite levels in the range of likely human influence (> 3.1 mg/L as nitrogen) (Madison and Brunett, 1984). The former well registered 4.9 mg/L as nitrogen and the latter 11 mg/L. The nitrate/nitrite level for well MI9A also exceeded the Primary MCL of 10 mg/L as nitrogen. The level in the sample from drilled well MI1 was within the natural range (not detected to 3 mg/L as nitrogen) at 0.03 mg/L as nitrogen. Detectable phosphorus was found in samples from all wells except bored well MI2A and drilled well Ml 16. Concentrations ranged from 0.02 mg/L (MI1) to 0.33 mg/L (MI10B). None of the samples contained detectable VOCs. 3.7.4 Metals by Inductively-Coupled Plasma Spectrometry (ICP) Samples from all six wells contained calcium, magnesium, and sodium. Calcium levels ranged from 3,600 ug/L (MI2A) to 45,000 ug/L (MI17). Magnesium levels ranged from 1,900 ug/L (MI17) to 14,000 ug/L (MI16). Sodium levels ranged from 3,100 ug/L (MI9A) to 16,000 ug/L (Ml 16). Iron was detected in samples from wells MI9A (24 ug/L) and MI10B (3,600 ug/L). This last value far exceeds the Secondary MCL for iron of 300 ug/L. Manganese was found in samples from two wells, MI10B (98 ug/L) and MI17 (12 ug/L). The 98 ug/L level exceeds the Secondary MCL for manganese of 50 ug/L. The high iron and manganese levels in water from drilled well MI10B is the reason the residents ceased using the water for household purposes, i.e., cooking, drinking, and laundering. Aluminum was detected in two wells, MI2A (130 ug/L) and MI9A (82 ug/L). 3-20 3.7.5 Metals by Inductively-Coupled Plasma/Mass Spectrometry (ICPMS) ICPMS analyses found detectable copper, zinc, selenium, barium, and lead in the Miocene aquifer samples. All six samples contained detectable barium, which ranged in concentration from 19 ug/L (MI1) to 190 ug/L (MI10B). Zinc was detected in samples from well MI1 (33 ug/L) and Ml 10B (130 ug/L). Detectable lead occurred in samples from bored wells MI2A (12 ug/L) and MI10B (1.7 ug/L). The sample from bored well MI2A contained copper at a level of 9.7 ug/L. The sample from drilled well MI10B contained selenium at a level of 14 ug/L). The copper, lead, and zinc in the water samples were likely derived from plumbing. Selenium at detectable levels is rare in Georgia's ground water. 3.8 PIEDMONT/BLUE RIDGE AQUIFER SYSTEM 3.8.1 Aquifer System Characteristics The Piedmont/Blue Ridge aquifer system in Georgia is part of the Piedmont and mountain aquifer system that extends from New Jersey into Alabama (Daniel and Harned, 1997). The system is variously unconfined or semiconfined and is composed of two major hydrogeologic units: a) regolith and b) fractured igneous and metamorphic bedrock (Heath, 1980; Daniel and Harned, 1997). Figure 3-8 shows the extent of the system in Georgia. Regolith comprises a mantle of soil or, in and near stream bottoms, alluvium, which is underlain by saprolite. Saprolite is bedrock that has undergone extensive chemical weathering in place. Downward percolating, typically acidic, ground water leaches alkali and alkaline earth and certain other metals from micas, feldspars, and other minerals composing the original rock, leaving behind a clay-rich residual material. Textures and structures of the original rock are typically well-preserved, with the saprolite appearing as a "rotten" version of the original rock. The regolith is characterized by high, mostly primary porosity (35% to 55%) (Daniel and Harned, 1998) and serves as the reservoir that feeds water into the underlying fractured bedrock. Though it can store a great deal of water, saprolite, owing to its clay content, does not give up its water very rapidly. Saprolite grades downward through a transition zone consisting of saprolite and partially weathered and some fresh bedrock into fresh bedrock. The fractured bedrock hydrologic unit consists of fresh rock of igneous or metamorphic origin. In contrast to the regolith, the porosity in such rocks is almost totally secondary, consisting of fractures and solution-enlarged voids. In the North Carolina Piedmont, Daniel and Harned (1998) found 1% to 3% porosity typical for bedrock. Fractures consist of faults -- breaks in the rock with differential displacement between the broken sections -- and joints -- breaks in the rock with little or no differential displacement (Heath, 1980). 3-21 P20 N General recharge area (from O'Connell and Davis, 1991) Sampling station Figure 3-8. Locations of Stations Monitoring the Piedmont/Blue Ridge Aquifer System. 3-22 Fractures tend to be wider and more numerous closer to the top of the bedrock. Daniel and Harned (1998) noted that at a depth about 600 feet, pressure from the overlying rock column becomes too great and fractures are held shut. Fracturing in schistose rocks consists mainly of a network of fine, hair-line cracks which yield water slowly. Fractures in more massive rocks (e.g. granitic rocks, diabases, gneisses, marbles, quartzites) are mostly open and are subject to conduit flow. Thus wells intersecting massive-rock fractures are able to yield far larger amounts of water than wells in schistose rocks or even wells in regolith. Fractures can be concentrated along fault zones, shear zones, late-generation fold axes, foliation planes, lithologic contacts, compositional layers, or intrusion boundaries. Forty-six samples from 17 wells and two springs were used to monitor water quality in the Piedmont/Blue Ridge aquifer system. Sixteen of these wells are drilled, with 12 being public supply wells and the remaining four being domestic. One domestic well is bored (P33) and is in domestic use. Of the two springs, one (P12A) is a mineral spring at a State park, and, the other spring (BR5) is a public supply source. The State park mineral spring and the following wells are scheduled for sampling on a quarterly basis: BR1B, P21, P23, P32, P33, P34, P35, and P37. The remaining stations are sampled on a yearly basis. Where their depths are known, wells deriving water from the bedrock aquifer range in depth from 150 feet to 600 feet. Domestic bored well P33, the only well drawing from the regolith, is 47 feet deep. 3.8.2 Field parameters Forty six pH measurements from 19 stations are available for the Piedmont/Blue Ridge aquifer system. The pHs ranged from 4.52 to 7.99. Seven samples from wells P20, P32, and P35 and mineral spring P12A were basic; two samples from two wells (BR1B and P24) were neutral; 37 samples from 14 wells and the two springs were acidic. Of the quarterly stations, well P32 gave consistently basic water; and, wells P21, P23, P33, P34, and P37 gave consistently acidic water. The mineral spring P12A and wells P35 and BR1B each gave water samples that were variously acidic, neutral or basic. All samples from regolith well P33 were acidic. Conductivity measurements are available for 46 samples from 19 stations. Conductivities ranged from 24 uS/cm (BR5) to 1280 uS/cm (P32). Temperatures are available for all sampled waters and range from 10.5 degrees C (P34) to 23.7 degrees C (P32). The low temperature measurement for station P34, a quarterly well, was taken during a winter sampling. The warmest temperature registered on a quarterly sample collected in July from well P32. Geothermally elevated temperatures are not readily apparent for the Piedmont/Blue Ridge. Latitude, ground elevation, and season appear to have more influence on the sampling temperature. 3-23 Dissolved oxygen measurements are available for 41 samples from 17 stations. Dissolved oxygen levels were not measured on samples from springs BR5 and P12A, since sample waters are exposed to atmosphere at the spring pools upstream of measurement points. Dissolved oxygen levels ranged from 0.00 mg/L for quarterly well P32 to 15.25 mg/L for quarterly well P34. The 15.25 mg/L reading and the next highest reading, 11.62 mg/L for quarterly well P21, lie above the oxygen saturation levels for the temperatures at sampling (19.4 degrees C and 18.3 degrees C). These two readings suggest free-falling (cascading) water in the well or entrainment of air at the pump intake due to a low pumping water level and do not reflect the actual oxygen level in the ground water. 3.8.3 Major Anions, Non-Metals, and Volatile Organic Compounds All samples received testing for chloride, sulfate, nitrate/nitrite, total phosphorus, and VOCs. Three samples each from spring P12A and well P23, both located at Indian Springs State Park, received testing for fluoride. Detectable chloride was found in 11 samples from five stations. Well P37 gave the sample with the highest chloride level at 240 mg/L. Chloride levels in samples from mineral spring P12A are nearly constant. Detectable chloride levels in samples from other stations were more variable. For the three samples from well P23 receiving fluoride testing, levels of the ion varied from 1.1 to 1.2 mg/L. Fluoride levels for three samples from spring P12A slightly exceeded the Primary MCL of 4 mg/L. Currently, as in the past, the spring has consistently given water with fluoride in the 4 mg/L to 5 mg/L range. Sulfate was detected in 25 samples from nine stations, with the highest concentration (620 mg/L) occurring in a sample from well P32. Well BR1B and spring P12A each gave samples with sulfate levels showing only slight variability. Nitrate/nitrite was detected in 35 samples from 17 stations but remained below detection in all samples from spring P12A and well P32 and in three of four samples from well P35. All other samples contained detectable nitrate/nitrite with levels ranging from 0.02 mg/L as nitrogen (well BR1B) to 1.7 mg/L as nitrogen (wells P5 and P30). Detectable phosphorus occurred in 30 samples from 12 wells and 2 springs, with the highest concentration of 22 mg/L being found for quarterly well P34. Quarterly wells BR1B and P32 produced no samples with detectable phosphorus, while all samples from quarterly wells P21, P23, and P34 and from spring P12A contained detectable phosphorus. Phosphorus concentration varies little or not at all in samples from mineral spring P12A and in quarterly wells P21 and P23. 3-24 The trihalomethane compound chloroform was the only VOC encountered. This disinfection breakdown product was detected in one sample from quarterly well P34, at 0.58 ug/L, and in two sequential samples from quarterly well P37, at 2.7 ug/L then 0.96 ug/L. The Primary MCL for all trihalomethanes in any one given sample is 80 ug/L. 3.8.4 Metals by Inductively-Coupled Plasma Spectrometry (ICP) ICP analysis found detectable aluminum, calcium, iron, potassium, magnesium, manganese, and sodium. No beryllium, cobalt, titanium, or vanadium were detected. Calcium was found in all samples except for the one from annual well P22. The highest calcium level occurred in the sample from quarterly well P32 (250,000 ug/L). The eight highest calcium levels occurred in samples from wells P32 and P37. As a rule, calcium levels of samples from each quarterly sampled well tend to fall close to the calcium levels in other samples from the same well. Magnesium was detected in 39 samples from 15 stations. Magnesium contents of sample waters ranged up to 26,000 ug/L (well P37). As with calcium, magnesium levels in quarterly sampled wells generally tend to cluster for each well. Samples from the quarterly regolith well P33 contained no detectable magnesium. Sodium was present in all samples and ranged from 2,000 ug/L in the sample from well P22 to 58,000 ug/L in a sample from well P37. Sodium levels for the quarterly wells have a general tendency to fall close to one another for each well, though this seems less pronounced than with calcium. Detectable potassium was found in six samples from two wells (PA35, PA37). The low sensitivity of the current laboratory testing procedure for the metal probably accounts for the apparent scarcity of the metal. Aluminum was detected in six samples from three wells and the mineral spring. The quarterly regolith bored well P33 contributed three detections, while the spring and the two other wells contributed one detection each. All detections fell within the Secondary MCL range of 50 ug/L to 200 ug/L. Nineteen samples from seven wells contained detectable iron, with a range up to 540 ug/L (P37). Two samples from drilled quarterly well P37 and one from bored quarterly well P33 exceeded the Secondary MCL of 300 ug/L. Another sample from the bored well equaled the Secondary MCL. Manganese was detected in 28 samples from nine stations, with a maximum concentration of 260 ug/L (P37). All samples from quarterly wells P37 and P35, one sample from quarterly well P21, and the sample from annual well P20 exceeded the Secondary MCL of 50 ug/L. 3-25 3.8.5 Metals by Inductively-Coupled Plasma Mass Spectrometry (ICPMS) ICPMS analysis of water samples detected the following metals: nickel, copper, zinc, arsenic, barium, lead, uranium. None of the following metals were found in detectable amounts: chromium, selenium, molybdenum, silver, cadmium, tin, antimony, and thallium. Nickel was found in three samples from quarterly well P37. The maximum nickel level was 13 ug/L, much below the Primary MCL of 100 ug/L. Copper occurred in 12 samples from six wells, with a maximum level of 44 ug/L in the sample from well P22. The samples with the five lowest pHs all contain some copper, with the 44 ug/L maximum occurring with the third lowest pH, 5.00. No detectable copper occurred in neutral or basic waters. Zinc was detected in 19 samples from seven wells, with the maximum level at 210 ug/L for well P24. All zinc detections except for two (P24 and P20) occurred in acidic waters. The pH of the sample from P24 (the well with the maximum level) was neutral, and, the pH of the sample from P20 was basic. Lead was detected in seven samples from seven wells. Quarterly wells P21, P33, P34, and P37 produced a single lead showing each. Only one lead detection occurred without a zinc detection or a copper detection. Well P30 gave the only sample containing detectable arsenic at a level of 5.2 ug/L. The Primary MCL for arsenic is 10 ug/L. Barium, as elsewhere in the State's ground water, was a nearly ubiquitous trace metal, being detected in 41 samples from 17 wells and two springs. Three samples from quarterly mineral spring P12A and in two samples from quarterly well P30 contained no detectable barium. The maximum concentration was 200 ug/L from a sample from annual well P20. No samples exceeded the Primary MCL of 2,000 ug/L. Uranium was detected in 30 samples from 10 wells. Uranium concentrations ranged up to 19 ug/L in a sample from well P40. Granitic bedrock is present where four of the ten wells are drilled and is the most common bedrock type to host uraniferous water. 3.9 VALLEY AND RIDGE/APPALACHIAN PLATEAU AQUIFER SYSTEM 3.9.1 Aquifer System Characteristics Since Georgia's portion of the Appalachian Plateau Province is restricted to a small area in the State's northwestern corner, this report includes that province with the Valley and Ridge Province for purposes of discussion. Bedrock in the combined 3-26 Province is sedimentary, comprising limestones, dolostones, shales, siltstones, mudstones, and sandstones. Primary porosity in the province's bedrock is very low, leaving fractures and solution-enlarged voids as the main water-bearing structures. The bedrock in the province is extensively faulted and folded, which has served to proliferate fracturing and to segment water-bearing units into numerous local flow systems. Fractures in limestones and dolostones can become enlarged by solution, greatly increasing their ability to store and transmit water. Zones of intense fracturing are especially prone to weathering, giving rise to broad valleys with gently sloping sides and bottoms covered with thick regolith. Such weathering and dissolution also develops extensive karst topography. Carbonate bedrock beneath such valleys presents a voluminous source of typically hard ground water. As in the Piedmont/Blue Ridge Province, this regolithic mantle of soil and residuum derived from weathered bedrock blankets much of the Valley and Ridge/ Appalachian Plateau Province. Where the water table lies within the mantle, the mantle yields soft typically acidic water ("freestone" water) sufficient for domestic and light agricultural use (Cressler et al., 1976; 1979). The mantle also acts as a reservoir, supplying water to the underlying bedrock, which, supplies most of the useful ground water in the province. The extensive faulting and folding has segmented otherwise expansive stratigraphically concordant aquifers into smaller ones with very local flow regimes, unlike the regional flow regimes that characterize the Coastal Plain aquifers. 'Monitoring water quality in the Valley and Ridge/Appalachian Plateau aquifers made use of four springs and two drilled wells (Figure 3-9). Springs VR2A, VR8, and VR10 are public supply springs; and, spring VR3 is a former public supply spring. Well VR1 is a public supply well, and, well VR6A is an industrial process water source. Spring VR8 is scheduled for sampling on a quarterly basis, while all other stations are sampled on a yearly basis. All stations tap carbonate bedrock aquifers. 3.9.2 Field parameters Sample water pHs ranged from 6.55 for spring VR2A to 7.76 for well VR1. The springs all returned slightly acidic pHs for June through August measurements on sample waters. Conductivities ranged from 155 uS/cm (well VR1) to 486 uS/cm (spring VR8). Dissolved oxygen measurements are available for wells VR1 - 6.23 mg/L and VR6A - 5.56 mg/L. Dissolved oxygen measurements were made on spring waters at or downstream of spring heads; however, due to atmospheric exposure at 3-27 [VR6A 40 MILES General recharge area (from Davis et al., 1989) Sampling station Figure 3-9. Locations of Stations Monitoring the Vallev-and-Ridqe/Appalachian Plateau Aquifer System. 3-28 the spring head and downstream, these measurements may not validly represent oxygen levels in the water prior to discharge. The temperature of sample waters from well VR1 was 16.6 degrees C and from well VR6A was 17.8 degrees C, which varied little or not at all from the previous year's sample temperatures. Contact with the surface environment may have altered temperatures measured for spring waters, since most measurements were done downstream from the springheads. 3.9.3 Major Anions, Non-Metals, and Volatile Organic Compounds Neither chloride, nor sulfate, nor phosphorus was detected in the sample waters. Nitrate/nitrite was present in all of the sample waters and ranged from 0.64 mg/L as nitrogen (well VR1) to 1.70 mg/L as nitrogen (spring VR10). The sample from well VR6A was the only one to contain detectable VOCs. The compounds consisted of: 1,1-dichloroethylene at 1.8 ug/L (Primary MCL = 7 ug/L), tetrachloroethylene at 2.2 ug/L (Primary MCL = 5 ug/L), m-dichlorobenzene at 0.59 ug/L (no Primary MCL), and o-dichlorobenzene at 1.6 ug/L (Primary MCL = 600 ug/L). The compounds, particularly the chlorinated ethylenes, see use as solvents. O-dichlorobenzene additionally sees use as a starting material for some agricultural chemicals. 3.9.4 Metals by Inductively-Coupled Plasma Spectrometry (ICP) ICP analysis found calcium, magnesium, and sodium in all samples. Detectable iron was present in three out of four samples from spring VR8, all at levels below the Secondary MCL of 300 ug/L. Neither manganese nor aluminum was detected in any of the samples. Calcium levels ranged from 27,000 ug/L (well VR1) to 38,000 ug/L (spring VR2A). Magnesium levels ranged from 14,000 ug/L (spring VR2A) to 17,000 ug/L (well VR6Aand spring VR8). Sodium levels ranged from 1,200 ug/L (spring VR3) to 5,000 ug/L (well VR6A). 3.9.5 Metals by Inductively-Coupled Plasma Mass Spectrometry (ICPMS) ICPMS analysis found barium and zinc. Detectable barium was present in all samples and ranged from 13 ug/L (well VR1 and spring VR8) to 620 ug/L (well VR6A). All samples save the one from VR6A have barium levels below 100 ug/L. Well VR6A furnishes process water to a firm that manufactures barium and strontium compounds and is situated in an area that sees the mining and processing of barite. Zinc at a level of 13 ug/L was found in the sample from spring VR10. A spigot in the treatment house near the spring head or related plumbing may have 3-29 contributed the zinc. This spigot is the only source of untreated water from the spring. 3-30 CHAPTER 4 SUMMARY AND CONCLUSIONS EPD personnel collected 141 water samples from 74 wells and six springs on the Ground-Water Monitoring Network during the calendar year 2012. The samples were analyzed for VOCs, chloride, sulfate, nitrate/nitrite, total phosphorus, 15 trace metals by ICPMS analysis, and 11 major metals by ICP analysis. Waters from two neighboring stations in the central Piedmont received analyses for fluoride because one of the stations was known to produce water with excessive levels of that ion. These wells and springs monitor the water quality of eight major aquifers and aquifer systems as considered for this report in Georgia: Cretaceous aquifer system, Clayton aquifer, Claiborne aquifer, Jacksonian aquifer Floridan aquifer system, Miocene/Recent aquifer system, Piedmont/Blue Ridge aquifer system, Valley and Ridge/Appalachian Plateau aquifer system. 4.1 PHYSICAL PARAMETERS AND pH 4.1.1 pH The Cretaceous aquifer system, developed in Coastal Plain sands, furnished waters with the overall lowest pHs as well as the lowest pH measurement (well K12) of the study. Even though this aquifer system featured only two wells yielding waters with basic pHs, one of these two wells also produced waters with the highest pH (well PD3). The Floridan aquifer system, as might be expected for carbonaterock aquifers, gave waters with mildly basic pHs; only two samples from two wells registered acidic. Waters from the Floridan are the most basic in pH of any in the study. Not many stations were available to sample wells tapping the Clayton, Claiborne, or Jacksonian aquifers. However, the results are these: 1) Clayton - 4-1 acidic - as expected for updip portions of the aquifer, downdip portions should be basic; 2) Claiborne - one basic, two acidic - one acidic-yielding well is shallow and updip in sands; basic-yielding well is deeper and probably penetrates some limey sand or limestone; 3) Jacksonian - four basic, one acidic - basic waters should be expected from limey sands. A few more stations were available to sample the Miocene and Valley-andRidge/Appalachian Plateau aquifer systems. The Valley-and-Ridge/Appalachian Plateau sampling stations are all located in the Valley-and-Ridge sector. With carbonate rocks being the major aquifer media, samples from the sector would be expected to be mildly basic. Of the nine samples taken in the sector, three were acidic: one each from two annually sampled springs and one from a quarterly sampled spring. Three of six stations, thus, gave acidic water, in contrast to the Floridan aquifer, where only two stations of 28 yielded two acidic samples. The seeming unusual high incidence of acidic water may be due to a larger amount of typically acidic precipitation entering the springs' flow systems than the carbonate bedrock can neutralize. The Miocene aquifer system is developed in sands, however, these may include considerable shelly detritus in some places (evident at surface excavations near well Ml 17). Dissolution of such detritus is capable of raising the pHs of ground waters in such areas, giving water from this well a mildly basic pH. In places where such shelly matter is not available, waters emerge with low pHs, as at well MI2A. Sample-water pHs in the Piedmont/Blue Ridge are general mildly acidic, with seven out of 46 sample measurements exceeding a pH of 7.00. The very acidic pHs of the sample waters in the updip portions of the Jacksonian, Clayton, Claiborne, and, particularly, the Cretaceous can face metal plumbing with leaching and corrosion problems. Such waters may contain elevated or excessive, but not naturally occurring, levels of lead, copper, and zinc. 4.1.2 Conductivity Conductivity in ground waters from the sandy Cretaceous aquifer system seems to be highest for the deeper wells near the Chattahoochee River. Overall, conductivities are relatively low, in the range of lower tens of microsiemenses. Similar conductivities can be found in waters from the updip portions of the Clayton and Claiborne aquifers, where the media consist mostly of sand. For the Piedmont/Blue Ridge aquifer system, low conductivities could be associated with ground waters hosted by quartzites or quartz veins. High conductivities may arise in waters in deep flow regimes where waters are long in contact with granitic and other reactive host rocks. 4-2 Conductivities of ground waters in the Floridan and other carbonate rock aquifers are generally higher than those in siliceous rocks. This condition results from the dissolution of carbonate minerals, in cases augmented by dissolution of intergranular sulfate, where dissolved sulfate will also be present in the water. 4.1.3 Temperature Ground-water temperatures measured under the current sampling procedure are only approximations of the actual ground-water temperature, as some heating can result from the action of pumping and heating or cooling can result from exposure to ambient surface conditions. Nevertheless, ground waters from shallower wells in the northern part of the State are overall somewhat cooler than those from the southern part; and, those from wells much deeper than about 400 to 500 feet show effects from geothermal warming. 4.2 ANIONS, NON-METALS AND VOCS 4.2.1 Chloride and Fluoride Water samples receive testing for fluoride only at Piedmont/Blue Ridge stations P12A, a mineral spring, and P23, a nearby well. Testing more stations for fluoride could provide a better base level assessment of fluoride contents in the State's ambient ground waters. Chloride at currently detectable levels is not too common in ambient ground waters. Abundance seems to be largest in the Miocene/Surficial, with two stations of less than 100 feet depth giving water with detectable chloride. Chloride is also relatively abundant in Piedmont/Blue Ridge waters, detected at five out of 19 stations, and in deeper Floridan waters, detected at five out of 28 stations. The Floridan occurrences seem restricted to the Gulf Trough and Coastal areas, with Coastal area sample from well PA9C giving the study's only Secondary MCL exceedance for chloride. 4.2.2 Sulfate Sulfate is more widespread than chloride. Sulfate is more abundant in deeper waters, with the shallowest occurrence, aside from Piedmont/Blue Ridge mineral spring P12A, being 200 foot-deep well J6. The substance seems more abundant in the Piedmont/Blue Ridge, occurring in detectable amounts in waters from nine of 19 stations. Sulfate also has considerable presence in Floridan sample waters (detectable at 12 out of 28 stations), and in Jacksonian sample waters (2 out of 3 stations). The sample from Floridan well PA9C yielded the study's highest overall sulfate content and a Secondary MCL exceedance. The lowest incidences of 4-3 detectable sulfate were in the Miocene/Surficial (at one of six stations) and in the sole Clayton station sample. 4.2.3 Nitrate/Nitrite Eighty-one samples from 51 of the 80 stations sampled for this project contained detectable nitrate/nitrite. At least one sampling station drawing from each of the aquifers and aquifer systems discussed in this report gave a sample with detectable nitrate/nitrite. The combined substances are most widespread among the Valley and Ridge/Appalachian Plateau samples, where all stations gave samples containing detectable amounts. The combined substances are also widespread in Piedmont/Blue Ridge and Floridan waters. The two highest concentrations of nitrate/nitrite (11 mg/L at well MI9A, 4.9 mg/L at well MI2A) occurred at Miocene/Surficial stations. The first sample exceeded Primary MCL of 10 mg/L as nitrogen, and, the second exceeded the 3 mg/L (as nitrogen) level generally considered to indicate human influence (Madison and Brunett, 1984; Gaskin et al., 2003). Since nitrate/nitrite, an oxidant, becomes depleted the farther water travels away from oxidizing, near-surface environments and toward reducing ones, a rude inverse relation exists between the concentration of nitrate/nitrite and well depths. The nitrate/nitrite concentrations in Floridan samples illustrate this: the combined substances are undetected in wells deeper than about 650 feet and reach a maximum concentration of 2.3 mg/L at well 97-foot deep PA49. The situation in the Piedmont/Blue Ridge is less straightforward, as mineral spring P12A lacks detectable nitrate/nitrite and well P24 at 700 feet gives water with a concentration of 0.23 mg/L. 4.2.4 Phosphorus Analyses determine only total phosphorus; the method used (EPA Method 365.1) for testing cannot determine how the element is bound chemically. Arithmetic means cited for the following aquifers use a value of 0.01 mg/L where a phosphorus value of "not detected" is reported. Only three samples from three stations were collected for the Claiborne, however, the aquifer registered the highest phosphorus content encountered (0.51 mg/L) as well as a mean phosphorus content of 0.28 mg/L. Of the more extensively sampled Piedmont/Blue Ridge and Floridan aquifer systems, the former registered a mean phosphorus content of 0.04 mg/L and the latter a content of 0.02 mg/L. The high phosphorus value for the Piedmont/Blue Ridge was 0.22 mg/L and the high for the Floridan was 0.06 mg/L. The apparent low phosphorus content occurred for the Valley and Ridge/Appalachian Plateau aquifer system with no phosphorus detections. 4-4 4.2.5 Dissolved Oxygen The measurement of dissolved oxygen contents is beset with some difficulties that can cause spurious values: instrument malfunction; aeration of well water due to cascading or to a pump's entraining air at low pumping water levels; measuring at spring pools or at sampling points that cannot be isolated from atmosphere. Nevertheless, measured dissolved oxygen generally decreases with well depth. 4.2.6 Volatile Organic Compounds Volatile organic compounds (VOCs) were found in 13 samples from nine wells (see Table 4-2). None exceeded their respective Primary MCLs. The trihalomethanes -- chloroform, bromodichloromethane, chlorodibromomethane and bromoform - were the most widely occurring of the VOCs. These compounds result from the reaction of halogen-bearing disinfectants used to treat water with organic matter naturally present in the water. The occurrence of these compounds commonly arises from one of two scenarios. The first involves the disinfection of well and plumbing components incident to maintenance or repairs, as took place in 2012 with well PA44. The second scenario involves a leaking check valve or foot valve that allows disinfectant-treated water to flow back down a well when its pump is turned off, as apparently happened with well PA23. Wells PA16 and VR6A yielded water containing chlorinated ethylene compounds. Sample water from VR6A also contained detectable chlorinated benzene compounds. The former are used as solvents; in addition to solvent uses, the latter can be used as disinfectants, fumigants, pesticides and starters for manufacturing other compounds. The owner of well VR6A, Chemical Products Corporation, manufactures barium and strontium compounds. 4.5 ICP METALS Analysis using inductively coupled plasma spectrometry (ICP) works well for metals that are generally the more abundant in ground water samples. Samples in this study were not filtered, so the method measured analytes that occurred in fine suspended matter as well as those occurring as solutes. The laboratory used the technique to test for aluminum, beryllium, calcium, cobalt, iron, magnesium, manganese, potassium, sodium, titanium, and vanadium. No beryllium, cobalt, titanium, or vanadium occurred in any samples at detectable levels. 4-5 4.3.1 Aluminum Aluminum, a common naturally occurring metal in the State's ground water, may be present in particulate form or as a solute. Current sampling procedures do not allow particulates and solutes to be analyzed separately. For its Secondary MCL, aluminum is subject to a range of concentrations from 50 ug/L to 200 ug/L, depending on the ability of a water system to remove the metal from water undergoing treatment. The EPD laboratory's reporting level for the metal, 60 ug/L lies within the Secondary MCL range, placing any sample with detectable aluminum within the MCL range. The metal appears to be most abundant in water samples with acidic pHs and, as a rule, is more concentrated the higher the acidity. The Miocene/Recent aquifer system, the updip portion Cretaceous aquifer system, and updip terrigenous clastic-rich portion of the Clayton aquifer are examples. Aquifers giving mildly basic samples such as the carbonate-hosted Floridan aquifer and carbonate portions of the Valley and Ridge/Appalachian Plateau aquifers produce few sample waters containing any detectable aluminum. The metal's abundance in bedrock waters from the Piedmont Blue Ridge aquifer system also seems low. Samples from deeper wells with more strongly basic phis (approaching 8.00) may contain some detectable aluminum. 4.3.2 Iron and Manganese Iron and manganese, also, are two naturally occurring metals in Georgia's ground water. Both, like aluminum, may occur as fine particulates or as solutes. Both seem more abundant in acidic waters. Manganese also seems more abundant in waters with low dissolved oxygen contents. Sand units (e.g., the Cretaceous and updip Clayton) and shallower igneous /metamorphic bedrock give waters with the highest iron or manganese concentrations. Waters with the lowest concentrations are drawn from carbonate units (e.g., the Floridan and the carbonates in the Valley and Ridge/ Appalachian Plateau province), which also usually have the higher phi waters. 4.3.3 Calcium, Magnesium, Sodium, and Potassium Table 4-1 gives the abundance by aquifer system of calcium, magnesium, and sodium. Calcium is most abundant in sample waters from the Jacksonian aquifer. Sample waters from the Floridan and the Piedmont/Blue Ridge aquifer systems also contain high calcium levels. The metal could be considered least abundant in samples from the Cretaceous/ Providence aquifer system. Only a 4-6 Table 4-1. Con tents of (Calcium, Magnesium, and Sodium n Samples by Aquifer, w th Concentration Mean and Range Aquifer/ Aquifer System Cretaceous Providence Mean* Calcium ug/L 4,246 Magnesium ug//L 954 Sodium ug/L 14,954 Range ND-22,000 ND - 1,400 1,000-73,000 Clayton Mean 1,100 1,100 3,400 Range 1,100 1,100 3,400 Claiborne Mean 24,333 1,567 1,767 Range 12,000-39,000 ND-3,000 1,700- 1,900 Jacksonian Mean 55,600 1,640 3,100 Range 50,000-66,000 ND - 2,600 1,900-4,500 Floridan Mean 38,966 12,621 17,453 Range 23,000- 100,000 ND - 74,000 1,800-400,000 Miocene/Surficial Mean 21,100 7,033 7,583 Piedmont/Blue Ridge Range Mean* Range 3,600-45,000 38,802 ND-250,000 1,900-14,000 5,637 ND - 26,000 3,100-16,000 16,202 2,000-58,000 Valley and Ridge Mean 33,222 15,778 2,022 Appalachian Plateau Range 27,000 - 38,000 14,000-17,000 1,200-5,000 *Non- detections (ND) are assigned a value of 1000 ug/L for calculating the arithmetic mean. single, updip sample is available from the Clayton aquifer, making this lowest average calcium content hardly representative. Magnesium appears most abundant in the Valley and Ridge/Appalachian Plateau aquifer system and least abundant in the Cretaceous system. Again, the average magnesium value for the Clayton aquifer depends on a single sample and is not representative for the aquifer. 4-7 Detectable sodium is nearly ubiquitous. The metal is most abundant in waters from the Floridan and the Piedmont/Blue Ridge but least so in waters from the more updip Cretaceous. The testing method used by the EPD laboratory to analyze for potassium is not very sensitive (reporting limit 5,000 ug/L), therefore, detectable potassium was found in only seven samples from three stations - one from the Floridan and two from the Piedmont/Blue Ridge. Kellam and Gorday (1990) observed that Ca/Mg ratios are highest in the Floridan where recharge areas are closest. Their observation also applies to Floridan in this study, and, a wide range of Ca/Mg ratios from indefinitely large (division by zero or a very small number) to 1.25 exists. However, for carbonate or carbonate-bearing aquifer media in the Valley and Ridge/Appalachian Plateau, the Jacksonian, the Claiborne, the Miocene/Surficial aquifers and aquifer systems, the rule does not seem to apply. The ratios seem to cluster around 2.00 for the Valley and Ridge/Appalachian Plateau samples, and to range from 19.23 up to indefinitely large for the Jacksonian. The low number of sampling stations situated in these other aquifers or aquifer systems might cause the differences between Floridan Ca/Mg ratios and ratios for the other aquifers and aquifer systems to be apparent. 4.4 ICPMS METALS The ICPMS method works well for most trace metals. Sample waters undergoing testing by this method, as with the samples subject to ICP testing, were unfiltered. The EPD laboratory tested for the following trace metals: chromium, nickel, copper, zinc, arsenic, selenium, molybdenum, silver, cadmium, tin, antimony, barium, thallium, lead, uranium. Silver, cadmium, tin, antimony, and thallium remained below detection in all samples. Of the remaining metals, only lead registered any levels above its action level. 4.4.1 Chromium and Nickel Detectable chromium occurred in two samples from two Floridan stations. One station, well PA49, is shallow at a 97-foot depth. The other, well PA44, and its downstream plumbing had recently undergone extensive maintenance. As the metal ordinarily does not accumulate in marine carbonate bedrock; outside contamination seems a likely source. In the case of station PA44, if maintenance practices employed coating compounds containing chromium, a possible source would exist. Well P37 gave three of four samples with low-level nickel. The metal would not be out of character in Piedmont/Blue Ridge bedrock. 4.4.2 Arsenic, Selenium, Uranium, and Molybdenum Arsenic was detected in a sample from the Piedmont/Blue Ridge (well P30) and in one from the Floridan (quarterly well PA23). The Floridan sample came from 4-8 the Gulf Trough area of Grady County, the scene of other ground-water arsenic detections, some above the Primary MCL (10 ug/L) (Donahue et al., 2012). Selenium was found in two samples, one from Miocene/Surficial well MI10B and the other from Floridan well PA9C. The element may accompany uranium in deposits formed by the reduction of oxic ground waters. Nine samples from three Floridan stations are the only samples containing detectable molybdenum. The stations - PA23, PA28, and PA56 - are all Gulf Trough area wells. Like selenium, molybdenum can be associated with uranium in deposits formed through the reduction of oxic ground waters (Turner-Peterson and Hodges, 1986). Uranium appears to be most abundant in Piedmont/Blue Ridge, with 10 of 19 stations giving 30 of 46 samples containing detectable uranium. The remaining uranium detections were divided between the Floridan, with samples from five stations containing detectable uranium, and the Cretaceous, with one station. Uranium minerals, sometimes accompanied by molybdenum and selenium minerals, can precipitate as secondary mineralization from oxic ground waters subjected to strong reduction. 4.4.3 Copper, Lead, and Zinc Copper, lead, and zinc detections are more numerous in acidic samples. Lead exceeded its action level in two samples yielding acidic water from wells K12 and K19. Copper did not exceed its action level nor zinc its Secondary MCL in any samples. Out of a total of 141 samples taken for the study, 31 samples with pHs below 7.00 contained detectable amounts of at least one of these metals. In contrast, only 11 samples with basic pHs and one sample with a neutral pH contained detectable amounts of any of these metals. Experiences, such as at station K19, where two samples, each drawn from a different spigot, had different copper, zinc, and lead values, suggest that these metals are, at least in part, derived from plumbing. Therefore, the copper, lead, and zinc levels in the samples are not necessarily representative of those in the ambient ground water at these locations. 4.4.4 Barium A possible effect of the sensitivity of the testing method, barium detections occur in almost every sample. Because, perhaps, nearby barite deposits and associated mining and processing activities greatly increased the barium level in ground water at station VR6A, a sample from that station has caused the Valley and Ridge/Appalachian Plateau samples to have the highest average barium level. Samples from the Floridan and Miocene/Surficial aquifer systems also have elevated average barium levels. Ground water containing excessive barium 4-9 (Primary MCL of 2,000 ug/L) has not been a problem since the in-town public well field, drawing from the Floridan at Fitzgerald, Ben Hill County, closed in 1995. 4.5 CONTAMINATION OCCURRENCES According to the Safe Drinking Water Act (Public Law 93-523, section 1401, Dec. 16, 1974) a "contaminant" is any "physical, chemical, biological, or radiological substance in water" - almost anything except water itself. Some contaminants can be innocuous or even beneficial; others can be undesirable or harmful. Modeled after limits the USEPA has established concerning the quality of water offered for public consumption, the State established limits on certain contaminants in water for public use (Table 4-2). Some contaminants may endanger health, if present in sufficient concentrations. Two types of limits apply to such contaminants. The first, the Primary MCL, imposes mandatory limits applying to treated water at the point of its production. The second, the action level, sets forth mandatory limits that regulate copper and lead contents and apply to water at the point where the consumer can partake of it. Secondary MCLs (Table 4-2) are suggested limits established for substances imparting only unpleasant qualities to water. The unpleasant qualities include bad taste and staining ability -- such as with iron and manganese. 4.5.1 Primary MCL and Action Level Exceedances Three wells and one spring produced samples with substances that exceeded Primary MCLs or action levels (Table 4-2). Mineral spring P12A gave three samples that exceeded the Primary MCL for fluoride (4 mg/L). The spring has, in the past, regularly given samples that fall in a range from 4 mg/L to slightly above 5 mg/L fluoride. The fluoride is almost certainly natural. Lead exceeded its action level of 15 ug/L in samples from two public wells, K12 and K19. A second sample retrieved from well K19 using a different, more frequently used spigot contained lead well below the action level, suggesting that the little-used spigot was the source of the contamination. The source of the excessive lead in well K12 is likely also the well plumbing. Lengthening the purge time before sampling, sampling from frequently used spigots, and increasing the flow through the sampling point have all resulted in reductions in the lead content of sample waters. 4-10 Nitrate/nitrite exceeded its Primary MCL of 10 mg/L as nitrogen in well MI9A. The well, a former garden well, 22 feet deep and located adjacent to a row-crop field, has yielded water with excessive nitrate/nitrite before. Table 4-2. Primary MCL and Copper/Lead Action Level Exceedances, Calendar Year 2012. Station Contaminant MCL Type Source Date Sampled MI9A Nitrate/nitrite = 11 mg/L as N 10 mg/L domestic well 06/06/12 K12 Lead = 29 ug/L 15 ug/L public well 05/10/12 K19 Lead = 20 ug/L 15 ug/L public well 05/09/12 P12A Fluoride = 4.7 mg/L 4 mg/L mineral spring 01/12/12 P12A Fluoride = 4.7 mg/L 4 mg/L mineral spring 04/12/12 P12A Fluoride = 4.3 mg/L 4 mg/L mineral spring 07/25/12 .4.5.2 Secondary MCL Exceedances Substances occurring in excess of Secondary MCLs (Table 4-3) consisted of manganese, iron, aluminum, sulfate, and chloride. Manganese, aluminum, and iron are common natural metals in Georgia's ground water. Manganese exceeded its MCL in 19 samples from 10 wells. Three of the wells were quarterly (P21, P35, P37, PA34A), with the latter three each gave four samples with excessive manganese The Secondary MCL for aluminum is established as a range, varying from 50 ug/L to 200 ug/L. The range is designed to accommodate the varying ability of water treatment facilities to remove aluminum from water being treated. Treatment facilities must manage a tradeoff between treating water with coagulants containing soluble aluminum and allowing suspended aluminum-bearing metals to bypass part of the treatment process. The aluminum present in waters covered by this study is naturally occurring rather than introduced. Of additional note, water in shallow wells may experience an increase in suspended matter (turbidity) during prolonged rain events, which may result in an increased aluminum value. Aluminum excesses, those which exceeded the 50 ug/L level (most ground water used for public 4-11 consumption lacks measureable suspended matter), were found in 18 samples from 15 wells and one spring. Aluminum excesses were the most regularly occurring in the domestic bored Piedmont regolith well P33. Table 4-3. Secondary MCL Exceedances, Calendar Year 2012. Excessive Contaminant Manganese Aluminum Iron Aquifer/ Aquifer System Sulfate Chloride No. of samples No. of stations No. of samples No. of stations No. of samples No. of stations No. of samples No. of stations No. of samples No. of stations Cretaceous 0055550000 Clayton 00 1 1 00 000 0 Claiborne 2200220000 Jacksonian 0000000000 Floridan 6344 1 1 1 1 1 1 Miocene/ Surficial 1 1 22 1 1 0000 Piedmont/ Blue Ridge 10 4 6 4 3 2 3 1 0 0 Valley and Ridge/ Appalachian 0 0 0 0 0 0 0 0 0 0 Plateau Iron exceeded its Secondary MCL in 13 samples from 11 wells. Iron is another common naturally occurring metal in Georgia's ground water. Two of the wells are quarterly (P33 and P37) but it gave only Two samples each that exceeded the MCL. 4-12 Two wells (P32 and PA9C) gave four samples with excessive sulfate. Well P32 is a Piedmont/Blue Ridge bedrock well drawing from the Elberton granite, and Well PA9C draws from a zone in the Floridan at Brunswick affected by brine intrusion. The sample from well PA9C with an excessive sulfate level also contained excessive chloride. 4.5.3 Volatile Organic Compounds Trihalomethanes are the most common of the VOCs detected (Table 4-4). Chloroform, the most commonly detected of VOCs, was present in 10 samples from six stations. Bromodichloromethane and chlorodibromomethane are next, with seven detections apiece in four stations. Detectable bromoform occurred in two samples from two stations. In ground water, these compounds originate as by products when halogenous disinfectants react with naturally-occurring organic matter present in the water. The disinfectants are introduced to the water through cleaning processes incident to well maintenance or through leaky check valves or foot valves allowing treated water down a well during normal operation. Two stations also gave two samples containing detectable perchloroethylene. One of these stations (VR6A) also gave water with detectable 1,1-dichloroethylene, n-dichlorobenzene, and p-dichlorobenzene. Well V6A, an industrial process water well, is in an industrial area and is within about two miles of former and current landfills. The former landfills utilized unlined exhausted barite pits. Cressler et al. (1979) had warned of the danger of using these sorts of pits for waste disposal in the Cartersville area because of the karstic bedrock. The VOCs at station V6A may originate from the pits, industrial establishments, or both. Table 4-4. VOC Contamination Incidents, Calendar Year 2012. Station Contaminant Primary MCL Type Source Date Samoled GWN-P34 chloroform = 0.58 ug/L See note public 02/22/12 GWN-P37 chloroform = 2.7 ug/L See note public 01/11/12 GWN-P37 chloroform = 0.96 ug/L See note public 04/11/12 GWN-PD6 bromodichloromethane = 0.75 ug/L See note public 08/0812 chlorobibromomethane = 0.95 ug/L 4-13 Table 4- 4 Continued. VOC Contaminatiori Incidents, Csilendar Ye ar 2012 Station Contaminant Primary MCL Type Source Date Sampled GWN-CL2 chloroform = 0.58 ug/L See note public 01/26/12 GWN-PA16 tetrachloroethylene = 0.53 ug/L GWN-PA17 chloroform = 1.8 ug/L bromodichloromethane = 1.4 ug/L chlorobibromomethane = 1.1 ug/L GWN-PA23 chloroform = 0.81 ug/L bromodichloromethane = 0.66 ug/L chlorobibromomethane = 0.59 ug/L GWN-PA23 chloroform = 1.9 ug/L bromodichloromethane = 1.4 ug/ L chlorobibromomethane = 1.4 ug/L GWN-PA23 chloroform = 1.9 ug/L bromodichloromethane = 1.5 ug/ L chlorobibromomethane = 1.2 ug/L GWN-PA23 chloroform = 1.7ug/L bromodichloromethane = 1.6 ug/L chlorodibromomethane = 1.6 ug/L GWN-PA44 bromoform = 0.5 ug/L chloroform = 8.7 ug/L bromoform = 0.8 ug/L bromodichloromethane = 3.3 ug/L chlorodibromomethane = 2.2 ug/L 5 ug/L See note See note See note See note See note See note public public 03/21/12 03/22/12 public 01/12/12 public 04/11/12 public 07/11/12 public 10/24/12 public 04/12/12 4-14 1 Table 4-4 Continued. VOC Contamination Incidents, Calendar Year 2012 Station Contaminant Primary MCL Type Source Date Sampled 1,1-dichloroethylene = 1.8 ug/L 7 ug/L GWN-VR6A tetrachloroethylene = 2.2 ug/L 1,2-dichlorobenzene = 1.6 ug/L 5 ug/L 75 ug/L industrial 05/23/12 1,3-dichlorobenzene = 0.59 ug/L No MCL Note: The sum of all trihalomethane compounds, i.e. chloroform, bromoform, chlorodibromomethane and dichlorobromomethane must not exceed a Primary MCL of 80 ug/L. 4.6 GENERAL QUALITY A review of the analyses of the water samples collected during calendar year 2012 indicates that the chemical quality of ground water sampled for most of the Ground-Water Monitoring Network stations is quite good. However, as mentioned in Chapter 1, areas of elevated risk for low-quality ground water exist: 1) Valley and Ridge/Appalachian Plateau Province - surface influence; 2) Piedmont/Blue Ridge Province - in areas excluding the eastern metavolcanic terranes -- uranium and radionuclides; 3) Coastal Plain agricultural areas - high nitrate/nitrite; 4) Coastal Plain, Dougherty Plain - surface influence; 5) Coastal Plain, Gulf Trough - high total dissolved solids, especially sulfate - high radionuclides, high barium, high arsenic; 6) Coastal Plain, Atlantic coast area - saline water influx. 4-15 CHAPTER 5 LIST OF REFERENCES Applied Coastal Research Laboratory, Georgia Southern University, 2002, Gulf Trough and Satilla Line Data Analysis, Georgia Geologic Survey Project Report 48, 14 p., 1 pi. Brooks, R., Clarke, J.S. and Faye, R.E., 1985, Hydrology of the Gordon Aquifer System of East-Central Georgia: Georgia Geologic Survey Information Circular 75, 41 p., 2 pi. Clarke, J.S., Faye, R.E., and Brooks, R., 1983, Hydrogeology of the Providence Aquifer of Southwest Georgia: Georgia Geologic Survey Hydrologic Atlas 11, 5 pi. Clarke, J.S., Faye, R.E., and Brooks, R., 1984, Hydrogeology of the Clayton Aquifer of Southwest Georgia: Georgia Geologic Survey Hydrologic Atlas 13, 6 pi. Midville Aquifer Systems of East Central Georgia: Georgia Geologic Survey Information Circular 74, 62p., 2 pi. Clarke, J.S., Brooks, R., and Faye, R.E., 1985, Hydrogeology of the Dublin and Midville Aquifer Systems of East Central Georgia: Georgia Geologic Survey Information Circular 74, 62 p., 2 pi. Clarke, J.S., Hacke, C.M., and Peck, M.F., 1990, Geology and Ground-Water Resources of the Coastal Plain of Georgia: Georgia Geologic Survey Bulletin 113, 116p., 12 pi. Clarke, J.S., Falls, W.F., Edwards, L.E., Fredriksen, N.O., Bybell, L.M., Gibson, T.G., Gohn, G.S., and Fleming, F., 1996, Hydrogeologic Data and Aquifer Interconnection in a Multi-Aquifer System in Coastal Plain Sediments Near Millhaven, Screven County, Georgia: Georgia Geologic Survey Information Circular 99, 49 p., 1 pi. Cressler, C.W., Franklin, M.A., and Hester, W.G., 1976, Availability of Water Supplies in Northwest Georgia: Georgia Geologic Survey Bulletin 91, 140 p. Cressler, C.W., Blanchard, Jr., H.E., and Hester, W.G., 1979, Geohydrology of Bartow, Cherokee, and Forsyth Counties, Georgia: Georgia Geologic Survey Information Circular 50, 45 p., 5 pi. Crews, P.A. and Huddlestun, P.F., 1984, Geologic Sections of the Principal Artesian Aquifer System, in Hydrogeologic Evaluation for Underground Injection Control in the Coastal Plain of Georgia: Georgia Geologic Survey Hydrologic Atlas 10, 41 pi. 5-1 Daniel III, C.C., and Harned, D., 1997: Ground-Water Recharge to and Storage in the Regolith-Crystalline Rock Aquifer System, Guilford County, North Carolina: USGS Water Resources Investigations Report 97-4140, 65 p. Daniels, B., and Mesner, N., 2010, Drinking Water Facts: Nitrate: Utah State University Water Quality Extension, 4 p. Davis, K.R., Donahue, J.C., Hutcheson, R.H., and Waldrop, D.L., 1989, Most Significant Ground-Water Recharge Areas of Georgia: Georgia Geologic Survey Hydrologic Atlas 19, 1 pi. Davis, K.R., 1990, Water Quality in Georgia for 1988: Georgia Geologic Survey Circular 12E, 99 p. Donahue, J.C., Kibler, S.R., and Chumbley, A.W., 2012, An Investigation of the Occurrence of Uranium in Ground Water in Georgia: Watershed Protection Branch Circular 12W, 105 p. Donahue, J.C., Kibler, S.R., and Chumbley, A.W.,2013, An Investigation of the Occurrence of Arsenic in Ground Water in the Gulf Trough Area of Georgia: Watershed Protection Branch Circular 12X, 69 p. EPD, 1991, A Ground-Water Management Plan for Georgia: Georgia Geologic Survey Circular 11 (1991 edition). EPD, 1998, A Ground-Water Management Plan for Georgia: Georgia Geologic Survey Circular 11 (1998 edition). EPD, 2009, State of Georgia Environmental Rule 391-3-5: Rules for Safe Drinking Water. Foyle, A.M., Henry, V.J., and Alexander, C.R., 2001, The Miocene Aquitard and the Floridan Aquifer of the Georgia/South Carolina Coast: Geophysical Mapping of Potential Seawater Intrusion Sites: Georgia Geologic Survey Bulletin 132, 61 p., 4 pi. Gaskin, J., Vendrell, P. F., and Atiles, J. H., 2003, Your Household Water Quality: Nitrate in Water. Univ. of Georgia Cooperative Extension Service Circular 858-5, 1 p. Gorday, L.L., Lineback, J.A., Long, A.F., and McLemore, W.H., 1997, A Digital Model Approach to Water-Supply Management of the Claiborn,Clayton, and Providence Aquifers in Southwestern Georgia, Georgia Geologic Survey Bulletin 118, 31 p., Appendix, Supplements and II. 5-2 Hayes, L.R., Maslia, M.L., and Meeks, W.C, 1983, Hydrology and Model Evaluation of the Principal Artesian Aquifer, Dougherty Plain, Southwest Georgia: Georgia Geologic Survey Bulletin 97, 93 p. Heath, R.C., 1980, Basic Elements of Ground-Water Hydrology with Reference to Conditions in North Carolina: USGS Open File Report 80-44, 87 p. Hetrick, J.H., 1990, Geologic Atlas of the Fort Valley Area: Georgia Geologic Survey Geologic Atlas 7, 2 pi. Hetrick, J.H., 1992, Geologic Atlas of the Wrens-Augusta Area: Georgia Geologic Survey Geologic Atlas 8, 3 pi. Hicks, D.W., Krause, Clarke, J.S., 1981, Geohydrology of the Albany Area, Georgia: Georgia Geologic Survey Information Circular 57, 31 p. Huddlestun, 1988, A Revision of the Lithostratigraphic Units of the Coastal Plain of Georgia: The Miocene through Holocene, Georgia Geologic Survey Bulletin 104, 162 p., 3pl. Huddlestun, P.F., 1993, A Revision of the Lithostratigraphic Units of the Coastal Plain of Georgia: the Oligocene: Georgia Geologic Survey Bulletin 104, 152 p. 5pl. Huddlestun, P.F., and Summerour, J., H., 1996, The Lithostratigraphic Framework of the Uppermost Cretaceous and Lower Tertiary of Burke County, Georgia: Georgia Geologic Survey Bulletin 127, 94 p., 1 pi. Kellam, M.F., and Gorday, L.L., 1990, Hydrogeology of the Gulf TroughApalachicola Embayment Area, Georgia: Georgia Geologic Survey Bulletin 94, 74 p,, 15 pi. Krause, R.E., 1979, Geohydrology of Brooks, Lowndes, and Western Echols Counties, Georgia: United States Geological Survey Water-Resources Investigations 78-117, 48 p., 8 pi. Krause, R.E., and Clarke, J.S., 2001, Coastal Ground Water at Risk - Saltwater Contamination at Brunswick, Georgia, and Hilton Head Island, South Carolina: United States Geological Survey Water-Resources Investigations Report 01-4107, 1 pi. Long, A.F., 1989, Hydrogeology of the Clayton and Claiborne Aquifer Systems: Georgia Geologic Survey Hydrologic Atlas 19, 6 pi. 5-3 McFadden, S.S., and Pemello, P.D., 1983, Hydrogeology of the Clayton and Claiborne Aquifers of Southwestern Georgia: Georgia Geologic Survey Information Circular 55, 59 p., 2 pi. Madison, R.J., and Brunett, J.O., 1984, Overview of the Occurrence of Nitrate in Ground Water of the United States in National Water Summary 1984 Hydrologic Events, Selected Water-Quality Trends, and Ground-Water Resources:, United States Geological Survey Water Supply Paper 2275, p. 93-105. Turner-Peterson, C.E. and Hodges, C. A.,1986, Descriptive Model of_Sandstone U, Model 30c, in Mineral Deposit Models: Deposits in Clastic Sedimentary Rocks. Cox, D.P. and Singer, D. E., eds., USGS Bulletin 1693, on-line pdf. publication. Pollard, L.D., and Vorhis, R.C., 1980, The Geology of the Cretaceous Aquifer System in Georgia: Georgia Geologic Survey Hydrologic Atlas 3, 5 pi. Summerour, J.H., Shapiro, E.A., Lineback, J.A., Huddlestun, P.F., and Hughes, A.C., 1994, An Investigation of Tritium in the Gordon and Other Aquifers in Burke County, Georgia: Georgia Geologic Survey Information Circular 95, 93 p. Tuohy, M. A., 1984, Isopach Map of the Claiborne Aquifer, in Hydrogeologic Evaluation for Underground Injection Control in the Coastal Plain of Georgia: Georgia Geologic Survey Hydrologic Atlas 10, 41 pi. Vincent, R.H., 1982, Geohydrology of the Jacksonian Aquifer in Central and East Central Georgia: Georgia Geologic Survey Hydrologic Atlas 8, 3 pi. Williams, L.J., 2007, Hydrology and Potentiometric Surface of the Dublin and Midville Aquifer Systems in Richmond County, Georgia, January 2007: U.S. Geological Survey Scientific Investigations Map 2983, 1 sheet. 5-4 APPENDIX LABORATORY AND STATION DATA Tables A-1 through A-8 list the values for both laboratory parameters and field parameters for each well or spring. The following abbreviations are used on these tables: Parameters and Units of Measure Cl = chloride cond. = conductivity diss 02 = dissolved oxygen F = fluoride ICP = inductively coupled plasma (emission) spectroscopy ICPMS = inductively coupled plasma/mass spectrometry mg/L = milligrams per liter mgN/L = milligrams per liter as nitrogen NA = not available; not analyzed ND NG NOx P S04 Temp ug/L uS/cm VOC = not detected = not given = nitrate/nitrite = total phosphorus = sulfate = temperature = micrograms per liter = microSiemenses per centimeter = volatile organic compound Volatile Orqanic Comoounds 1,1dce bdcm dbcm pee = 1,1-dichloroethylene = bromodichloromethane = dibromochloromethane = tetrachloroethylene odeb pdeb tbm tem = o-dichlorobenzene = p-dichlorobenzene = bromoform = chloroform Table A-9 gives the reporting limits for the various analytes. The abbreviations used for Tables A-1 through A-8 also apply to Table A-9. A-1 Table A-1. Ground-Water Quality Analyses for Cretaceous/Providence Stations. Part A: Station Identification, Date of Sampling, Field Parameters, VOCs, Anions, and Non-Metals. Station No. County Well Name Well Depth Casing Depth Well Size Date feet feet Inches sampled GWN-K3 Sandersville Well #7B 697 NG NG 05/09/12 Washington GWN-K6 Twiggs KaMin Well #6 400 NG NG 12/12/12 GWN-K7 Jones Jones County #4 128 NG NG 05/10/12 GWN-K9 Marshallville Well #1 550 NG NG 01/26/12 Macon GWN-K10B Fort Valley Well #6 Peach 600 NG NG 01/26/12 GWN-K11A Warner Robins Well #2 540 NG NG 03/08/12 Houston GWN-K12 Peny/Holiday Inn Well 550 NG NG 05/10/12 Houston GWN-K19 Richmond Hephzibah/Murphy Street Well 484 NG NG 05/09/12 12/05/12 GWN-K20 Sumter Plains Well #7 1000 NG NG 06/07/12 GWN-PD2A Preston Well #4 Webster 205 NG NG 03/08/12 GWN-PD3 Fort Gaines Well #2 456 NG NG 03/08/12 Clay GWN-PD6 Early Blakely Well #4 1025 NG NG 03/08/12 pH cond. diss 02 Temp uS/cm mg/L "C 5.97 131 5.93 21.3 VOCS ug/L ND Cl mg/L ND 5.56 100 6.59 19.36 ND ND 4.79 24 7.02 17.7 ND ND 4.02 30 0.01 19.6 ND ND 4.66 10 7.70 18.3 ND ND 4.69 12 5.76 18.8 ND ND 3.90 47 0.63 19.5 ND ND 4.86 13 8.00 20.3 ND ND 4.75 32 7.49 19.84 ND ND 7.76 72 NA 28.9 ND ND 5.50 39 7.70 19.2 ND ND 8.38 355 0.58 21.7 ND 10 7.85 338 2.03 22.9 dbcm=0.95 ND bdcm=0.75 504 NOx P mg/L mg N/L mg/L 11 0.42 0.43 ND ND ND ND 0.53 ND 11 ND ND ND 0.68 ND ND 0.79 ND 10 ND 0.02 ND 0.11 0.02 ND 0.10 ND ND ND 0.18 ND 1.8 0.13 ND ND 0.02 13 0.24 0.02 A-2 Table A-1. Ground-Water Quality Analyses for Cretaceous/Providence Stations Part B: Metals. Station No. County GWN-K3 Washington GWN-K6 Twiggs GWN-K7 Jones GWN-K9A Macon GWN-K10B Peach GWN-K11A Houston GWN-K12 Houston GWN-K19 Richmond GWN-K20 Sumter GWN-PD2A Webster GWN-PD3 Clay GWN-PD6 Early Chro Nick mium el uq/L ug/L Cop Zinc Arsen Selen Molyb Silver Cad Tin Anti Banurr Thal Lead Ura Alumi Beryl Calcium Co per ppb ic ium denum ppb mium ppb mony ppb lium ppb nium num lium balt ug/L uq/L uq/L ug/L ug/L uq/L ug/L uq/L uq/L uq/L uo/L uq/L uq/L ug/L ug/L ug/L ug/L Iron Potas Magne Manga Sodium Tita Vana sium sium nese nium dium ug/L ug/L ug/L ug/L ug/L ug/L ug/L ND ND 6.1 ND ND ND ND ND ND ND ND 28 ND 2.0 ND 75 ND 22,000 ND 510 ND 1,400 21 2,600 ND ND ND ND ND ND ND ND ND ND ND ND ND 17 ND ND 1.1 ND ND 5,000 ND 650 ND ND ND 3,100 ND ND ND ND ND ND ND ND ND ND ND ND ND 18 ND 1 8 ND ND ND 2,100 ND ND ND ND ND 1,800 ND ND ND ND 48 88 ND ND ND ND ND ND ND 3.8 ND 4.0 ND 490 ND ND ND 450 ND ND ND 1,000 ND ND ND ND ND ND ND ND ND ND ND ND ND 43 ND ND ND ND ND ND ND ND ND ND ND 1,200 ND ND ND ND 7.9 13 ND ND ND ND ND ND ND 6.7 ND ND ND ND ND ND ND 310 ND ND 14 1,700 ND ND ND ND 27 47 ND ND ND ND ND ND ND 56 ND 29 ND 430 ND ND ND 170 ND ND 12 1,000 ND ND ND ND 13 180 ND ND ND ND ND 14 ND ND ND ND ND ND ND ND ND ND ND ND ND 63 ND 20 ND ND ND ND ND 400 ND ND ND ND ND ND ND 5.5 ND 1.2 ND ND ND ND ND 23 ND ND ND ND ND ND ND ND ND ND ND ND ND 3,100 ND ND ND ND 11 1,200 ND ND ND 1,300 ND ND ND 22,000 ND ND ND ND 9.9 ND ND ND ND ND ND ND ND 20 ND 2.6 ND 110 ND 4,500 ND 54 ND 1,200 ND 1,500 ND ND ND ND ND ND ND ND ND ND ND ND ND 46 ND ND ND 61 ND 6,300 ND ND ND 1,100 ND 83,000 ND ND ND ND ND ND ND ND ND ND ND ND ND 7.4 ND ND ND ND ND 9,200 ND ND ND 4,200 ND 73,000 ND ND A-3 Table A-2. Ground-Water Quality Analyses for Clayton Stations. Part A: Station Identification, Date of Sampling, Field Parameters, VOCs, Anions, and Non-Metals. Station No. County GWN-CT8 Schley Well Name Well Depth Casing Depth Well Size Date feet feet Inches sampled Weathersby House Well 80 NG NG 05/10/12 pH cond. diss 02 Temp uS/cm mg/L "C 4.27 45 7.90 18.2 VOCS ug/L ND Cl mg/L ND 504 NOx P mg/L mg N/L mg/L ND 2.1 ND A-4 Table A-2. Ground-Water Quality Analyses for Clayton Stations. PartB: Metals. Station No County GWN-CT8 Schley Chro- Nick- Cop- Zinc Arsen- Selen- Molyb- Siluc-f Cad- Tin Anti- Bariuir Thai- Lead Lira- Alumi- Beryl- Calcium Co- mium el per ppb ic ium denum ppb mium ppb morty ppb Hum ppb nium num lium bait uq/L uo/L ug/L uq/L Ufl/L ug/L uq/L ufl/L uq/L ufl/L uq/L Uffft. uo/L uq/L uq/L ua/L uq/L uq/L uq/L Iron Rotas- Magne- Manga- SotSum Trta- Vana- sium slum nese mum dium uq/L uq/L uq/L uq/L uq/L uq/L uq/L ND ND 20.0 ND ND ND ND ND ND ND ND 26 ND 5.6 ND 120 ND 1,100 ND ND ND 1,100 26 3,400 ND ND A-5 Table A-3. Ground-Water Quality Analyses for Claiborne Stations. Part A: Station Identification, Date of Sampling, Field Parameters, VOCs, Anions, and Non-Metals. Station No. County Well Name Well Depth Casing Depth Well Size Date feet feet Inches sampled GWN-CL2 Dooly Unadilla Well #3 315 315 24 01/26/12 GWN-CL4A Plains Well #8 Sumter 230 NG NG 06/07/12 GWN-CL8 Flint River Nursery Office 90 NG NG 01/26/12 Dooly Well pH cond. diss 02 Temp VOCS uS/cm mg/L "C ug/L 7.54 127 3.10 19.8 tcm=0.55 6.78 98 NA 20.3 ND 6.20 53 0.02 20.7 ND Cl mg/L ND ND ND S04 NOx P mg/L mg N/L mg/L ND 0.41 ND 12 ND 0.34 ND ND 0.51 Table A-3. Ground-Water Quality Analyses for Claiborne Stations, Part B: Metals. Station No County GWN-CL2 Dooly GWN-CL4A Sumter Chro Nick Cop Zinc Arsen Selen Molyb Silver Cad Tin Anti Bariurr Thal Lead Ura Alumi Beryl Calcium Co mium el per ppb ic ium denum ppb mium ppb mony ppb lium ppb nium num lium balt ufftL uq/L ug/L ug/L uq/L uq/L ug/L UO/L uq/L uq/L Ufl/L Ufl/L uq/L uq/L ug/L ug/L uq/L ug/L ug/L Iron Potas Magne Manga Sodium Tita Vana sium sium | nese nium dium ug/L ug/L ug/L uq/L uq/L ug/L uq/L ND ND ND ND ND ND ND ND ND ND ND 11 ND ND ND ND ND 39,000 ND ND ND ND ND 1.700 ND ND ND ND ND ND ND ND ND ND ND ND ND 12 ND ND ND ND ND 22,000 ND 1,800 ND 3,000 56 1,700 ND ND GWN-CL8 Dooly ND ND ND ND ND ND ND ND ND ND ND 36 ND ND ND ND ND 12,000 ND 650 ND 1,200 51 1,900 ND ND A-7 Table A-4. Ground-Water Quality Analyses for Jacksonian Stations. Part A: Station Identification, Date of Sampling, Field Parameters, VOCs, Anions, and Non-Metals. Station No. County Well Name GWN-J1B Jefferson McNair House Well GWN-J4 Johnson GWN-J5 Bleckley GWN-J6 Jefferson Wrightsville #4 Cochran #3 Wrens #4 GWN-J8A Jefferson Kahn House Well II Well Depth Casing Depth Well Size Date feet feet Inches sampled -90 NG NG 03/21/12 PH cond. diss 02 Temp uS/cm mg/L UC 7.13 270 5.98 19.1 VOCS ug/L ND C! mg/L 10 504 NOx P mg/L ma N/L mg/L ND 2.6 0.06 520 NG 8 02/21/12 7.35 251 0.88 20.4 ND ND ND 0.06 0.03 307 NG NG 03/08/12 7.50 212 0.00 20.5 ND ND 12 ND 0.04 200 NG NG 03/21/12 6.97 255 2.71 19.5 ND ND 12 ND 0.15 NG NG NG 03/21/12 7.35 296 1.99 19.0 ND ND ND 0.04 0.03 Table A-4. Ground-Water Quality Analyses for Jacksonian Stations PartB: Metals. Station No County GWN-J1B Jefferson Chro Nick Cop Zinc Arsen Selen Molyb Silver Cad Tin Anti Bariurr Thal Lead Ura Alumi Beryl Calcium Co Iron Potas Magne- ! Manga Sodium Tita Vana mium el per ppb ic ium denum ppb mium ppb mony ppb lium ppb nium num lium balt sium sium nese nium dium uq/L uq/L up/L ug/L uq/L ug/L ug/L ug/L ug/L uq/L ug/L uq/L uq/L uq/L uq/L ug/L ug/L ug/L uq/L ug/L ug/L ug/L uq/L ug/L ug/L ug/L ND ND ND ND ND ND ND ND/ ND ND ND 21 ND ND ND ND ND 53,000 ND ND ND ND ND 4,500 ND ND GWN-J4 Johnson ND ND 6.6 ND ND ND ND ND ND ND ND 82 ND ND ND ND ND 50,000 ND ND ND 2,600 ND 3,500 ND ND GWN-J5 Bleckley GWN-J6 Jefferson ND ND ND ND ND ND ND ND ND ND ND 7.8 ND ND ND ND ND 66,000 ND ND ND 2,500 ND 3,200 ND ND ND ND ND ND ND ND ND ND ND ND ND 75 ND ND ND ND ND 50,000 ND 150 ND 1,500 ND 1,900 ND ND GWN-J8A Jefferson ND ND ND ND ND ND ND ND ND ND ND 9.7 ND ND ND ND ND 59,000 ND ND ND 1,100 22 2,400 ND ND A -9 Table A-5. Ground-Water Quality Analyses for Floridan Stations. Part A: Station Identification , Date of Sampling, Field Parameters, VOCs, Anions, and Non-Metals. A-10 Station No. County Well Name Well Depth Casing Depth Well Size Date feet feet Inches sampled GWN-PA2 Chatham Savannah Well #13 1004 NG NG 05/10/12 GWN-PA4 Tybee Island Well #1 402 NG NG 05/10/12 Chatham GWN-PA5 Interstate Paper Well #1 810 NG NG 05/09/12 Liberty GWN-PA6 Liberty Hinesville Well #5 806 NG NG 05/09/12 09/26/12 GWN-PA9C Miller Ball Park North 1211 NG Glynn East Well NG 05/09/12 GWN-PA13 Waycross Well #3 Ware 775 NG NG 03/22/12 GWN-PA14A Statesboro Well #4 Bulloch 413 NG NG 03/07/12 05/23/12 08/22/12 11/28/12 GWN-PA16 Millen Well #1 Jenkins 500 NG NG 03/21/12 GWN-PA17 Swainsboro Well #7 260 NG NG 03/22/12 Emanuel GWN-PA18 Metter Well #2 Candler 540 NG NG 03/21/12 GWN-PA20 Lakeland Well #2 Lanier 340 NG NG 03/22/12 GWN-PA22 Thomasville Well #6 400 NG NG 03/07/12 Thomas pH cond. diss 02 Temp uS/cm mg/L uc 8.02 149 NA 22.7 8.00 406 0.00 22.9 7.95 197 0.00 24.6 7.99 174 0.03 24.7 7.76 285 0.53 24.7 7.71 311 0.14 26.3 7.97 248 0.00 25.0 7.52 163 7.36 234 7.54 238 7.82 258 NA 23.3 NA 23.4 NA 24.1 NA 23.35 7.61 270 1.17 21.5 7.45 241 5.56 18.9 7.85 208 0.62 21.8 7.97 222 0.09 22.0 7.62 374 3.99 22.2 VOCS ug/L ND ND ND NA ND ND ND ND ND ND ND pce=0.53 tcm=1.8 bdcm=1 4 dbcm=1.1 ND ND ND Cl mg/L ND 45 ND ND ND 760 14 ND ND ND ND ND ND ND ND ND S04 NOx P mg/L mg N/L mg/L ND ND 0.04 150 ND 0.04 34 ND 0.03 22 ND 0.03 23 ND ND 270 ND 0.03 50 ND ND ND ND 0.04 ND ND 0.03 ND ND 0.03 ND ND 0.03 ND ND 0.02 ND 0.03 ND ND ND 0.03 65 ND 0.06 65 0.15 ND Table A-5. Ground-Water Quality Analyses for Floridan Stations Part B: Metals. Station No. County GWN-PA2 Chatham GWN-PA4 Chatham GWN-PA5 Liberty GWN-PA6 Liberty GWN-PA9C Glynn GWN-PA13 Ware GWN-PA14A Bulloch GWN-PA16 Jenkins GWN-PA17 Emanuel Chro Nick Cop Zinc Arsen Selen Molyb Silver Cad Tin Anti Bariurr Thal Lead Ura Alumi Beryl Calcium Co mium el per ppb ic ium denum ppb mium ppb mony ppb lium ppb nium num lium balt uq/L uq/L ug/L uq/L uq/L ug/L ug/L uq/L ug/L uq/L uq/L uq/L uq/L uq/L ug/L ug/L ug/L ug/L ug/L Iron Potas Magne Manga Sodium Tita Vana sium sium nese nium dium ug/L ug/L ug/L ug/L ug/L ug/L ug/L ND ND ND ND ND ND ND ND ND ND ND 12 ND ND ND ND ND 23,000 ND ND ND 8,400 ND 14,000 ND ND ND ND ND ND ND ND ND ND ND ND ND 86 ND ND ND ND ND 35,000 ND ND ND 28,000 ND 58,000 ND ND ND ND ND ND ND ND ND ND ND ND ND 29 ND ND ND ND ND 26,000 ND ND ND 15,000 ND 17,000 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 10.0 ND ND ND ND ND 23.0 ND ND ND 160 ND 24,000 ND ND ND ND ND ND ND 25.0 ND ND ND ND ND 24,000 ND ND ND 12,000 ND ND 13,000 ND 14,000 ND ND 15,000 ND ND ND ND ND ND ND 57 ND ND ND ND ND 100,000 ND 550 8,100 74,000 ND 400,000 ND ND ND ND ND ND ND ND ND ND ND ND ND 67 ND ND ND ND ND 40,000 ND ND ND 19,000 ND 16,000 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 7.4 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 4.1 ND ND ND ND ND 35,000 ND ND ND ND ND ND ND 4.2 ND ND ND ND ND 34,000 ND ND ND ND ND ND ND 3.9 ND 1.4 ND ND ND 34,000 ND ND ND ND ND ND ND 4 1 ND ND ND ND ND 34,000 ND ND ND ND ND ND ND 4.2 ND ND ND ND ND 47,000 ND ND ND 6,700 ND ND 6,500 ND ND 6,700 ND ND 6,800 ND ND 3,700 60 7,700 7,300 7,600 7,400 ND ND ND ND ND ND ND ND 5,300 ND ND ND ND ND ND ND ND ND ND ND ND ND 170 ND ND ND ND ND 48,000 ND ND ND 1,900 ND 3,300 ND ND A -11 GWN-PA18 Candler GWN-PA20 Lanier GWN-PA22 Thomas ND ND ND ND ND ND ND ND ND ND ND 25 ND ND ND ND ND 30,000 ND ND ND 3,700 64 11,000 ND ND ND ND ND ND ND ND ND ND ND ND ND 26 ND ND ND 190 NO 43,000 ND ND ND 18,000 ND 4,900 ND ND ND ND ND ND ND ND ND ND ND ND ND 24 ND ND 1 3 ND ND 47,000 ND ND ND 22,000 ND 7,600 ND ND A-12 Table A-5, Continued. Ground-Water Quality Analyses for Floridan Stations. Part A: Station Identification, Date of Sampling, Field Parameters, VOCs, Anions, and Non-Metals. Station No. County Well Name Well Depth Casing Depth Well Size Date feet fee! Inches sampled pH cond. diss 02 Temp VOCS uS/cm mg/L UC ug/L Cl mg/L GWN-PA23 Cairo #8 Grady 465' NG NG 01/12/12 7.78 247 1.33 22.6 tcm=0.81 ND bdcm=0.66 dbcm=0.59 04/11/12 7.72 338 2.84 23.0 tcm=1 9 ND bdcm=1 4 dbcm=1.4 07/11/12 7.86 215 NA 23.3 tcm=1 9 ND bdcm=1.5 dbcm=1 2 10/24/12 7.44 353 2.18 22.9 tcm=1.7 ND bdcm=1.6 dbcm=1 6 tbm=0.5 GWN-PA25 Donalsonville / 7th Street 174 NG NG 03/07/12 7.22 280 5.44 21.10 ND ND Seminole Well 06/06/12 7.51 183 NA 21.10 ND ND 09/12/12 6.59 294 5.60 21.30 ND ND 12/12/12 7.53 282 7.14 21.72 ND ND GWN-PA27 Camilla Industrial Park 360 NG NG 03/21/12 7.84 150 3.91 20.7 ND ND Mitchell Well GWN-PA28 Moultrie Well #1 Colquitt 750 NG NG 01/12/12 8.05 339 0.48 23.5 ND 11 04/11/12 7.89 430 0.59 23 8 ND ND 07/11/12 7.97 310 NA 23.7 ND 11 10/24/12 7.57 492 0.54 23 6 ND 11 GWN-PA29 Adel Well #6 Cook 405 NG NG 01/12/12 7.84 233 0.04 22.0 ND ND 04/11/12 7.68 326 1.21 22.3 ND ND 07/12/12 7.82 212 NA 22.0 ND ND 10/24/12 7.39 351 0.57 22.2 ND ND GWN-PA30 Propex/Nashville Mills 410 NG NG 03/22/12 8.05 218 0.01 23.7 ND ND Berrien Well #2 GWN-PA31 Tifton Well #6 Tift 652 NG NG 01/25/12 7.43 263 1.20 22.2 ND ND GWN-PA32 Ocilla Well #3 Irwin 637 NG NG 03/07/12 7.28 137 0.00 20.9 ND ND S04 NOx P mq/L mg N/L mg/L 42 0.02 ND 39 ND ND 38 ND ND 39 ND ND ND 1.6 0.02 ND 1.7 ND ND 1.6 ND ND 1.6 ND ND 0.60 ND 120 ND ND 96 ND ND 120 ND ND 120 ND ND 50 ND 0.05 51 ND 0.05 50 ND 0.04 55 ND 0.04 61 ND ND ND 0.02 ND ND ND 0.03 Table A-5. Ground-Water Quality Analyses for Floridan Stations. Part B: Metals. Station No. County GWN-PA23 Grady Chro Nick Cop Zinc Arsen Selen Molyb Silver Cad Tin Anti Bariurr Thal Lead Ura Alumi Beryl Calcium Co mium el per ppb ic ium denum ppb mium ppb mony ppb lium ppb nium num lium balt uq/L uo/L ug/L uq/L Uf)/L ug/L ufl/L ug/L uq/L uo/L ug/L ug/L uo/L ug/L ug/L uq/L ug/L ug/L uq/L Iron Potas Magne Manga Sodium Tita Vana sium sium nese | nium dium uq/L ua/L uq/L uq/L uq/L ua/L ua/L ND ND ND ND 5.0 ND 18 ND ND ND ND 120 ND ND ND ND ND 36,000 ND 24 ND 17,000 ND 16,000 ND ND ND ND ND ND ND ND 14 ND ND ND ND 120 ND ND ND ND ND 35,000 ND 34 ND 17,000 ND 15,000 ND ND ND ND ND ND ND ND 12 ND ND ND ND 110 ND ND ND ND ND 34,000 ND 140 ND 17,000 ND 15,000 ND ND ND ND ND ND ND ND 16 ND ND ND ND 130 ND ND ND ND ND 34,000 ND ND ND 17,000 ND 15,000 ND ND A -1 3 GWN-PA25 Seminole GWN-PA27 Mitchell GWN-PA28 Colquitt GWN-PA29 Cook GWN-PA30 Berrien GWN-PA31 Tift GWN-PA32 Irwin ND ND ND 34 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 9 5 ND 2.2 ND 110 ND 61,000 ND 65 ND ND ND ND ND 7.0 ND ND ND ND ND 57,000 ND ND ND ND ND ND ND 7.4 ND ND ND ND ND 56,000 ND ND ND ND ND ND ND 80 ND ND ND ND ND 61,000 ND ND ND ND ND ND ND 11 ND ND ND ND ND 46,000 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 1,500 ND 3,800 3,600 3,500 3,900 ND ND ND ND ND ND ND ND 1,900 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 87 ND ND ND ND ND 38,000 ND ND ND ND ND ND ND 90 ND ND ND ND ND 36,000 ND ND ND ND ND ND ND 88 ND ND ND ND ND 40,000 ND ND 5.2 ND ND ND ND 95 ND ND ND ND ND 40,000 ND ND ND ND ND ND ND 11 ND ND ND ND ND 44,000 ND 28 ND ND ND ND ND 11 ND ND ND ND ND 46,000 ND 28 ND ND ND ND ND 11 ND ND ND ND ND 43,000 ND 28 ND ND ND ND ND 12 ND ND ND ND ND 48,000 ND 24 ND ND ND ND ND 50 ND ND ND ND ND 40,000 ND 210 ND 23,000 ND ND 21,000 ND ND 24,000 ND ND 24,000 ND ND 15,000 17 ND 16,000 17 ND 15,000 15 ND 18,000 17 ND 18,000 ND 27,000 ND ND 28,000 ND ND 28,000 ND ND 29,000 ND ND 3,300 3,400 3,200 3,600 ND ND ND ND ND ND ND ND 5,200 ND ND ND ND 74 ND ND ND ND ND ND ND ND 65 ND 2 1 1.6 ND ND 42,000 ND 22 ND 8,100 ND 2,400 ND ND ND ND ND ND ND ND ND ND ND ND ND 73 ND ND ND ND ND 34,000 ND 88 ND 5,900 28 2,500 ND ND Table A-5, Continued. Ground-Water Quality Analyses for Floridan Stations. Part A: Station Identification, Date of Sampling, Field Parameters, VOCs, Anions, and Non-Metals Station No. County Well Name GWN-PA34A McRae Well #3 Telfair GWN-PA36 Vidalia Well #1 Toombs GWN-PA38 Eastman Well #4 Dodge GWN-PA39 SylvesterWell #1 Worth GWN-PA44 Sycamore Well #2 Turner Well Depth Casing Depth Well Size Date feet feet Inches sampled 600 NG NG 02/21/12 05/23/12 08/22/12 11/28/12 808 NG NG 02/21/12 05/23/12 08/22/12 11/28/12 410 NG NG 04/12/12 196 NG NG 03/21/12 501 NG NG 04/12/12 07/11/12 10/25/12 GWN-PA49 Harmony Church Well 97 NG NG 03/21/12 Dooly GWN-PA56 Whigham / Davis Avenue 604 NG NG 03/07/12 Grady Well 06/06/12 09/12/12 12/12/12 GWN-PA57 Ambrose Well #2 Coffee 600 465 10 01/12/12 04/12/12 07/11/12 10/25/12 pH 7.34 7.10 6.75 7.38 7.75 7.59 7.11 7.88 7.49 7.75 7.75 8.02 7.49 8.10 7.56 7.85 7.32 7.81 7.87 7.74 8.00 7.54 cond. diss 02 Temp uS/cm mg/L C 304 4.93 22.3 325 060 22.6 322 0.53 22.5 350 0.60 22.3 216 0.58 23.1 221 0.60 24.0 220 0.53 23.3 241 1.07 23.41 244 4.01 20.4 180 0.92 21.8 204 2.90 22 3 120 NA 21.5 196 3.31 21.4 122 7.38 20.9 377 1.30 23.0 253 NA 23.0 412 1.10 23.0 410 1.39 23.37 174 0.21 22.3 241 2.36 22.3 157 NA 22.8 255 0.67 22.6 VOCS ug/L ND ND ND ND ND ND ND ND ND ND tcm=8.7 tbm=0 8 bdcm=3.3 dbcm=2 2 ND ND ND ND ND ND ND ND ND ND ND Cl mg/L ND ND ND ND ND ND ND ND ND ND ND ND ND ND 34 36 37 34 ND ND ND ND S04 NOx P mg/L mg N/L mg/L ND ND 0.03 ND ND 0.02 ND ND ND ND ND ND ND ND 0.03 ND ND 0.03 ND ND ND ND ND ND ND 0 28 0 03 ND 0.04 ND ND 0.1 0.03 ND 0.24 ND ND 0.24 ND ND 2.3 ND 19 0.06 ND 22 0.05 0.02 20 0.05 ND 20 0.06 ND ND 0.03 0.02 ND ND 0.02 ND ND ND ND ND ND A-14 Table A-5. Ground-Water Quality Analyses for Floridan Stations Part B: Metals. Station No County GWN-PA34A Telfair GWN-PA36 Toombs GWN-PA38 Dodge GWN-PA39 Worth GWN-PA44 Turner Chro Nick Cop Zinc Arsen Selen Molyb Silver Cad Tin Anti Bariurr Thal Lead Ura Alumi Beryt- Calcium Co Iron Potas Magne Manga Sodium Tita Vana mium el per ppb ic ium denum ppb mium ppb mony ppb lium ppb nium num lium balt sium sium nese nium dium uo/L uq/L ug/L uq/L uq/L uo/L ug/L uo/L ug/L ua/L uq/L uq/L uq/L uo/L ug/L uq/L uq/L ug/L uq/L ug/L uq/L ug/L ug/L ug/L ug/L ug/L ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 180 ND ND ND ND ND 51,000 ND 260 ND ND ND ND ND 190 ND ND ND ND ND 47,000 ND 230 ND ND ND ND ND 160 ND 14 ND ND ND 50,000 ND 240 ND ND ND ND ND 190 ND ND ND ND ND 47,000 ND 230 ND 11,000 100 ND 10,000 94 ND 11,000 99 ND 11,000 93 4,700 4,400 4,900 4,500 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 6.1 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 140 ND ND ND ND ND 28,000 ND 25 ND 5,400 36 11,000 ND ND ND ND ND ND ND 140 ND ND ND ND ND 27,000 ND 23 ND 5,400 36 11,000 ND ND ND ND ND ND ND 130 ND 1.5 ND ND ND 28,000 ND 20 ND 5,600 37 11,000 ND ND ND ND ND ND ND 150 ND ND ND ND ND 29,000 ND ND ND 5,900 36 12,000 ND ND ND ND ND ND ND ND ND ND ND ND ND 110 ND ND ND ND ND 51,000 ND ND ND 1 500 ND 2,300 ND ND ND ND ND ND ND ND ND ND ND ND ND 190 ND ND 2.3 ND ND 47,000 ND ND ND 7,900 ND 3,800 ND ND 5.8 ND ND ND ND ND ND ND ND ND ND 130 ND ND 14 ND ND 33,000 ND ND ND 4,900 ND 3,500 ND ND A -1 5 GWN-PA49 Dooly GWN-PA56 Grady GWN-PA57 Coffee ND ND ND ND ND ND ND ND ND ND ND ND 52 ND ND 21 ND ND ND ND ND ND ND 140 ND ND 1.3 ND ND 32,000 ND ND ND 4,500 ND 2,400 ND ND ND ND ND ND ND 150 ND ND 1.3 ND ND 30,000 ND ND ND 4,500 ND 2,400 ND ND ND ND ND ND ND 18 ND ND ND ND ND 37,000 ND 31 ND ND ND 1,800 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 83 ND ND ND ND 140 ND ND 2.8 ND ND 34,000 ND ND 88 ND ND ND ND 150 ND ND 2 9 ND ND 29,000 ND ND 9,9 ND ND ND ND 160 ND ND 3 2 ND ND 31,000 ND ND 9.0 ND ND ND ND 150 ND ND 27 ND ND 33,000 ND ND ND ND ND ND ND 170 ND ND ND ND ND 27,000 ND ND ND ND ND ND ND 170 ND ND ND ND ND 26,000 ND ND ND ND ND ND ND 170 ND ND ND 94 ND 24,000 ND ND ND ND ND ND ND 190 ND ND ND ND ND 24,000 ND ND ND 21,000 ND ND 18,000 ND ND 20,000 ND ND 20,000 ND ND 15,000 ND ND 15,000 ND ND 14,000 ND ND 15,000 ND 25,000 ND ND 21,000 ND ND 23,000 ND ND 24,000 ND ND 7,800 7,600 7,300 7,500 ND ND ND ND ND ND ND ND Table A-6. Ground-Water Quality Analyses for Miocene Stations. Part A: Station Identification , Date of Sampling, Field Parameters, VOCs, Anions, and Non-Metals. Station No. County Well Name Well Depth Casing Depth Well Size Date feet feet Inches sampled GWN-MI1 Cook Adel/McMillan 220 NG NG 01/25/12 GWN-MI2A Boutwell House Well 70 NG NG 01/25/12 Lowndes GWN-MI9A Murphy Garden Well 22 NG NG 06/06/12 Thomas GWN-MI10B Calhoun House Well 150 NG NG 06/06/12 Colquitt GWN-MI16 Liberty County East Dis- 400 NG NG 09/26/12 Liberty trict Fire Station Deep Well GWN-MI 17 Springfield Egypt Road 120 NG NG 05/10/12 Effingham Test Well pH 7.74 4.39 6.89 6.54 7.38 7.72 cond. diss 02 Temp uS/cm mg/L UC 228 3.23 21.4 93 670 21.5 131 NA 22.3 69 NA 22.2 317 1.19 23.9 159 0.00 19.2 VOCS ug/L ND ND ND ND ND ND Cl mg/L ND S04 NOx P mg/L mg N/L mg/L ND 0.03 0.02 13 ND 4.9 ND 10 ND 11 0.12 ND ND ND 0.33 ND 35 ND ND ND ND ND 0.03 A-16 Table A-6. Ground-Water Quality Analyses for Miocene Stations, Part B: Metals. Station No. County GWN-MI1 Cook GWN-MI2A Lowndes Chro Nick Cop Zinc Arsen Selen Molyb Silver Cad Tin Anti Bariurr Thal Lead Ura Alumi Beryl Calcium Co Iron Potas Magne Manga Sodium Tita Vana mium el per ppb ic Ium denum ppb mium ppb mony ppb lium ppb nium num lium balt sium sium nese nium dium uq/L uq/L uq/L ug/L uq/L ug/L ug/L uo/L ug/L uo/L uq/L ug/L uq/L uq/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ua/L ug/L ug/L ND ND ND 33 ND ND ND ND ND ND ND 19 ND ND ND ND ND 23,000 ND ND ND 14,000 ND 6,500 ND ND ND ND 9.7 ND ND ND ND ND ND ND ND 21 ND 12 ND 130 ND 3,600 ND ND ND 2,500 ND 4,800 ND ND GWN-MI9A Thomas GWN-MMOB Colquitt GWN-MI16 Liberty GWN-MI 17 Effingham ND ND ND ND ND ND ND ND ND ND ND 71 ND ND ND 82 ND 22,000 ND 24 ND 4,200 ND 3,100 ND ND ND ND ND 130 ND 14 ND ND ND ND ND 190 ND 1 7 ND ND ND 8,000 ND 3,600 ND 5,600 98 6,700 ND ND ND ND ND ND ND ND ND ND ND ND ND 23 ND ND ND ND ND 25,000 ND ND ND 14,000 ND 16,000 ND ND ND ND ND ND ND ND ND ND ND ND ND 23 ND ND ND ND ND 45,000 ND ND ND 1,900 12 8,400 ND ND A -1 7 Table A-7. Ground-Water Quality Analyses for Piedont-Blue Ridge Stations. Part A: Station Identification, Date of Sampling, Field Parameters, VOCs, Anions, and Non-Metals Station No. County Well Name Well Depth Casing Depth Well Size Date feet feet Inches sampled pH cond. diss 02 Temp uS/cm mg/L UC GWN-P1A Luthersville Well #3 Meriwether 185 NG NG 06/06/12 5.76 81 7.52 17.5 GWN-P5 Flowery Branch Well #1 240 NG NG 06/07/12 6.34 179 6.03 17.0 Hall GWN-P12A Indian Spring Butts 0 NG NG 01/12/12 6.80 246 NA 15.7 04/12/12 7.41 159 NA 16.8 07/25/12 6.66 250 NA 19.4 10/18/12 6.97 270 NA 183 GWN-P20 Gwinnett Suwanee #1 600 NG NG 01/11/12 7.52 205 0.13 17.7 GWN-P21 Jones Gray/Bragg Well GWN-P22 Fulton Rahbar Well 405 NG NG 02/21/12 6.54 285 1.94 19.6 05/24/12 6.31 287 4.89 19.4 08/09/12 6.07 294 11.62 19.7 11/15/12 6.57 479 5.67 18.37 200 NG NG 6/6/2012 5.00 24 6.54 17 1 GWN-P23 Indian Springs State Park NG NG NG 01/12/12 6.78 249 2.07 18.1 Butts New Main Well 04/12/12 6.44 88 1.44 18.2 07/25/12 5.62 140 1.76 18.5 10/18/12 6.10 152 1.58 18.3 GWN-P24 Coweta The Gates Well #1 705 NG NG 05/24/12 7.00 203 2.99 19.2 GWN-P30 Lincoln Fizer House Well 220 NG NG 08/10/12 6.55 407 1.28 19.1 GWN-P32 Cecchini Deep Well 400 NG NG 01/11/12 7.92 874 1.36 16.6 Elbert 04/11/12 7.99 452 0.00 18.1 07/11/12 7.30 1280 0.52 23.7 10/17/12 7.14 714 0.66 18.6 VOCS ug/L ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND Cl mg/L 304 NOx P mg/L mg N/L mg/L ND ND 0.99 0.08 ND ND 1.70 0.04 11 26 ND 0.03 11 25 ND 0.03 11 26 ND 0.02 11 26 ND 0.02 ND 15 0.29 ND 10 22 0.08 0.04 ND 19 0.06 0.04 ND 29 0.05 0.03 ND 26 0.06 0.03 ND ND 0.89 ND 36 ND 0.23 0.08 ND ND 0.25 0.08 ND ND 0.21 0.08 ND ND 0.18 0.08 ND 12 0.23 0.05 14 18 1.60 0.03 ND 340 ND ND ND 220 ND ND ND 620 ND ND ND 300 ND ND A-18 Table A-7. Ground-Water Quality Analyses for Piedmont-Blue Ridge Stations, Part B: Metals. Station No County GWN-P1A Meriwether Chro-! Nickmium el uq/L uq/L Cop per uq/L Zinc ppb uq/L Arsenic uq/L Selenium uq/L Molyb- Silver Cad- Tin Anli- Ranurr Thai- Lead denum ppb mium ppb mony ppb lium ppb ug/L uq/L ug/L uo/L uq/L uq/L uq/L uq/L Uranium ug/L Alumi- Berylnum Hum ug/L ug/L Calcium uo/L Cobait uq/L Iron Rotas- Magne- Manga- Sodium Tita- Vana- sium sium nese nium dium ug/L uq/L uq/L uq/L uq/L ug/L uq/L ND ND ND ND ND ND ND ND ND ND ND 42 ND ND ND ND ND 9,000 ND ND ND 1,900 ND 4,300 ND ND GWN-P5 Hall ND ND ND ND ND ND ND ND ND ND ND 42 ND ND ND ND ND 25,000 ND ND ND 4,800 ND 3,900 ND ND GWN-P12A Butts GWN-P20 Gwinnett ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 15 ND ND ND ND ND ND ND ND ND ND ND ND ND 16,000 ND ND ND 2,500 19 40,000 ND ND ND ND ND ND ND ND ND ND ND ND ND 16,000 ND ND ND 2,500 19 39,000 ND ND ND ND ND ND ND 2.0 ND ND ND 64 ND 16,000 ND ND ND 2,600 19 41,000 ND ND ND ND ND ND ND ND ND ND ND ND ND 16,000 ND ND ND 2,700 21 43,000 ND ND ND ND ND ND ND 200 ND ND 4 1 ND ND 45,000 ND ND ND 9,200 62 13,000 ND ND A -1 9 GWN-P21 Jones GWN-P22 Futton ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 44 ND ND ND ND ND ND ND ND 14 ND ND 9 3 ND ND 38,000 ND ND ND 8,400 48 16,000 ND ND ND ND ND ND ND 15 ND ND 8.0 ND ND 34,000 ND ND ND 7,800 35 14,000 ND ND ND ND ND ND ND 14 ND 1.2 5.9 ND ND 34,000 ND ND ND 7,600 59 15,000 ND ND ND ND ND ND ND 15 ND ND 7 8 ND ND 36,000 ND ND ND 8,100 47 15.000 ND ND ND ND ND ND ND 17 ND 1.1 ND ND ND ND ND ND ND ND ND 2,000 ND ND GWN-P23 Butts GWN-P24 Coweta ND ND ND 39 ND ND ND ND ND 28 ND ND ND ND ND 30 ND ND ND ND ND 42 ND ND ND ND ND 210 ND ND ND ND ND ND ND 4.7 ND ND 22 ND ND 11,000 ND 93 ND 3,600 ND 44,000 ND ND ND ND ND ND ND 5.0 ND ND 2.1 ND ND 11,000 ND 110 ND 3,600 ND 14,000 ND ND ND ND ND ND ND 54 ND ND 2.3 ND ND 12,000 ND 35 ND 3,700 ND 14,000 ND ND ND ND ND ND ND 4.2 ND ND 2 3 ND ND 12,000 ND 120 ND 4,000 ND 15,000 ND ND ND ND ND ND ND 5.0 ND ND 1 5 ND ND 26,000 ND ND ND 4,200 ND 10,000 ND ND GWN-P30 Lincoln ND ND ND ND 52 ND ND ND ND ND ND 2.6 ND ND ND ND ND 41,000 ND ND ND 23,000 ND 16,000 ND ND GWN-P32 Elbert ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 160 ND ND 160,000 ND ND ND ND ND ND ND 2.3 ND ND 14 0 ND ND 210,000 ND ND ND ND ND ND ND 3.0 ND ND 12.0 ND ND 250,000 ND 49 ND ND ND ND ND ND ND ND 16 0 ND ND 160,000 ND ND ND 2,000 ND 2,000 ND 1,300 ND 2,300 18 25,000 ND ND 19 30,000 ND ND 16 32,000 ND ND 19 26,000 ND ND Table A-7, Continued. Ground-Water Quality Analyses for Piedont-Blue Ridge Stations. Part A: Station Identification, Date of Sampling, Field Parameters, VOCs, Anions, and Non-Metals. Station No. County Well Name Well Depth Casing Depth Well Size Date feet feet Inches sampled pH cond. diss 02 Temp VOCS uS/cm mg/L UC ug/L Cl mg/L 304 NOx P mg/L mg N/L mg/L GWN-P33 Cecchini Bored Well 47 NG NG 01/11/12 6.75 110 6.59 17.8 ND ND ND 0.37 0.03 Elbert 04/11/12 6 82 70 4.70 17.6 ND ND ND 0.37 0.03 07/11/12 5.03 60 7.00 18.4 ND ND ND 0.23 ND 10/17/12 5.11 87 661 18.3 ND ND ND 0.39 0.02 GWN-P34 Mistletoe State Park NG NG NG 02/22/12 5.77 81 15.26 10.5 tcm=0 58 ND ND 0.66 0.11 Columbia Cottage Area Well 05/09/12 6.13 150 8.20 18.8 ND ND 16 0.44 0.22 08/10/12 4.67 59 7.06 18.7 ND ND ND 0.54 0.08 11/15/12 6.15 221 8.27 18.29 ND ND 10 0.57 0.20 GWN-P35 Franklin O'Connor Well 150 NG NG 01/11/12 6.23 181 0.77 16.9 ND ND ND ND 0.02 04/11/12 7.23 118 0.03 17.1 ND ND ND ND 0.03 07/11/12 6.25 180 0.67 17.5 ND ND ND ND ND 10/17/12 6.55 186 0.71 17.1 ND ND ND 0.05 0.03 GWN-P37 Mt. Airy/City Hall Well 500 NG NG 01/11/12 5.50 172 3.43 13.3 tcm=2.7 240 38 0.80 0.03 Habersham 04/11/12 6.24 589 1.87 16.5 tcm=0.96 220 46 0.63 ND 07/11/12 5.91 663 2.20 16.7 ND 160 29 0.36 ND 10/17/12 5.92 638 2.81 16.6 ND 120 32 0.37 ND GWN-P38 Carroll Roopville Well #1 230 NG NG 06/08/12 4.52 38 6.66 18.0. ND ND ND 1.70 ND A-20 GWN-P39 Gay Well #1 Meriwether 600 NG NG 05/24/12 5.89 63 8.77 17.7 ND ND ND 1.00 0.06 GWN-P40 Greene Siloam Well #2 300+ NG NG 06/20/12 6.25 70 5.80 19.5 ND ND ND 1.20 0.09 GWN-BR1B Young Harris/ 265 NG NG 02/22/12 7.00 158 1.14 15 6 ND ND 19 0.05 ND Towns Swanson Road Well 06/07/12 6.82 160 1.02 15.8 ND ND 20 0.02 ND 08/08/12 6.18 155 7.37 15.8 ND ND 20 0.05 ND 11/14/12 6.95 300 1.60 15.45 ND ND 21 0.04 ND GWN-BR5 Murray Chatsworth/ Nix Spring 0 NG NG 05/24/12 5.72 24 NA 14.6 ND ND ND 0.43 0.06 Table A-7. Ground-Water Quality Analyses for Piedmont-Blue Ridge Stations. Part B: Metals. Station No County Chro. Nick Cop Zinc Arsen Selen Molyb Silver Cad Tin Anti Bariurr Thal Lead Ura Alumi Beryl Calcium Co mium el per ppb ic ium denum ppb mium ppb mony ppb lium ppb nium num lium balt UO/L ua/L ug/L uq/L uq/L uq/L uq/L uq/L ug/L uq/L uq/L uq/L uq/L uq/L ug/L ug/L u^/L ug/L ug/L Iron Potas Magne Manga Sodium Tita Vana sium sium nese nium dium ug/L ug/L ug/L ug/L ug/L ug/L ug/L GWN-P33 Elbert GWN-P34 Columbia GWN-P35 Franklin GWN-P37 Habersham GWN-P3S Carroll ND ND 18 27 ND ND ND ND 20 29 ND ND ND ND 13 35 ND ND ND ND 19 42 ND ND ND ND 18 41 ND ND ND ND 67 22 ND ND ND ND 9 8 15 ND ND ND ND 7 13 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 12 ND ND ND ND ND ND ND ND ND ND 12 ND 22 ND ND ND 13 ND 20 ND ND ND 11 ND 12 ND ND ND ND ND 11 ND ND ND ND 6.2 ND ND ND ND ND ND ND ND 21 ND ND ND 180 ND 16,000 ND 310 ND ND ND 4,100 ND ND ND ND ND ND ND 19 ND 1 5 ND 79 ND 17,000 ND 300 ND ND ND 4,700 ND ND ND ND ND ND ND 23 ND ND ND ND ND 7,500 ND 60 ND ND ND 3,800 ND ND ND ND ND ND ND 25 ND ND ND 85 ND 13,000 ND 230 ND ND ND 4,400 ND ND ND ND ND ND ND 23 ND ND 5.2 ND ND 4,700 ND 70 ND 2,700 18 9,500 ND ND ND ND ND ND ND 16 ND ND 160 ND ND 11,000 ND ND ND 5,300 ND 12,000 ND ND ND ND ND ND ND 31 ND 5.9 3.7 ND ND 2,800 ND ND ND 2,100 13 6,400 ND ND ND ND ND ND ND 13 ND ND 13 0 ND ND 8,300 ND ND ND 4,300 ND 10,000 ND ND ND ND ND ND ND 32 ND ND 3.0 ND ND 20,000 ND 78 6,200 5,700 120 ND ND ND ND ND 30 ND ND 37 ND ND 22,000 ND 43 7,100 6,600 130 ND ND ND ND ND 30 ND ND 40 ND ND 20,000 ND 28 6,600 6,300 120 ND ND ND ND ND 30 ND ND 1.9 ND ND 19,000 ND 110 6,400 6,100 120 7,400 7,800 7,500 7,900 ND ND ND ND ND ND ND ND ND ND ND ND ND 130 ND ND 2.1 170 ND 99,000 ND 540 5,200 25,000 240 58,000 ND ND ND ND ND ND ND 110 ND ND 1 0 ND ND 100,000 ND 180 5,200 26,000 260 40,000 ND ND ND ND ND ND ND 98 ND 1.7 ND ND ND 75,000 ND 220 ND 20,000 250 27,000 ND ND ND ND ND ND ND 75 ND ND 1.2 ND ND 68,000 ND 330 ND 16,000 140 19,000 ND ND ND ND ND ND ND 27 ND 1.8 ND 65 ND 1,200 ND ND ND ND 25 4,900 ND ND A-21 GWN-P39 Meriwether GWN-P40 Greene GWN-BR1B Towns GWN-BR5 Murray ND ND 26 21 ND ND ND ND ND ND ND 38 ND 3.1 ND ND ND 4,700 ND 57 ND 1,100 ND 6,400 ND ND ND ND ND ND ND ND ND ND ND ND ND 18 ND ND 19.0 ND ND 11,000 ND ND ND 2,000 ND 13,000 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 78 ND ND 9.3 ND ND 22,000 ND ND ND 4,800 20 ND ND ND ND ND 75 ND ND 8.3 ND ND 20,000 ND ND ND 4,500 22 ND ND ND ND ND 74 ND ND 75 ND ND 20,000 ND ND ND 4,600 20 ND ND ND ND ND 86 ND ND 9.2 ND ND 21,000 ND ND ND 4,900 21 ND ND ND ND ND 15 ND ND ND ND ND 3,200 ND ND ND ND ND 4,200 3,900 3,900 4,100 ND ND ND ND ND ND ND ND 3,200 ND ND Table A-8. Ground-Water Quality Analyses for Valley-and-Ridge/Appalachian Plateau Stations. Part A: Station Identification, Date of Sampling, Field Parameters, VOCs, Anions, and Non-Metals. Station No. County Well Name Well Depth Casing Depth Well Size Date feet feet Inches sampled GWN-VR1 Floyd County 280 NG NG 05/23/12 Floyd Kingston Road Well GWN-VR2A LaFayette Lower Walker Big Spring 0 NG NG 06/20/12 GWN-VR3 Chickamauga Crawfish 0 Walker Spring NG NG 06/20/12 GWN-VR6A Chemical Products Corp. 300 NG NG 05/23/12 Bartow South Well GWN-VR8 Polk Cedartown Spring GWN-VR10 Eton Spring Murray 0 NG NG 02/22/12 05/23/12 08/08/12 11/14/12 0 NG NG 05/24/12 pH 7.76 6.78 6.55 7.61 7.28 7.53 6.84 7.44 7.30 cond. diss 02 Temp uS/cm mg/L "C 155 6.23 16.6 VOCS ug/L ND Cl mg/L ND 294 6.02 16.1 ND ND 256 8.30 15.4 ND ND 173 5.56 17.8 1,1dce=1.8 ND pce=2.2 odcb=1.6 mdcb=0.59 274 7.64 16.8 ND ND 170 6.88 16.7 ND ND 265 8.00 17.0 ND ND 486 10.75 16.15 ND ND 162 NA 18.0 ND ND S04 NOx P mg/L mg N/L mg/L ND 0.64 ND ND 1.60 ND ND 0.81 ND ND 0.84 ND ND 0.78 ND ND 0.72 ND ND 0.91 ND ND 0.70 ND ND 1.70 ND A-2 2 Table A-8. Ground-Water Quality Analyses for Valley-and-Ridge/Appalachian Plateau Stations PartB: Metals. Station No County GWN-VR1 Floyd GWN-VR2A Walker GWN-VR3 Walker GWN-VR6A Bartow Chro Nick Cop Zinc Arsen Selen Molyb Silver Cad Tm Anti Banurr Tbat- Lead Ura Alumi Beryl Calcium Co mium el per ppb ic ium denum ppb mium ppb mony ppb Ikim ppb nium num lium balt ug/L uq/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L uq/L Uf)/L ug/L ug/L ug/L ug/L ug/L ug/L Iron Potas Magne Manga Sodium Tita Vana sium sium nese nium dium ug/L ug/L ug/L ug/L ug/L ug/L ug/L ND ND ND ND ND ND ND ND ND ND ND 13 ND ND ND ND ND 27,000 ND ND ND 16,000 ND 1,600 ND ND ND ND ND ND ND ND ND ND ND ND ND 90 ND ND ND ND ND 38,000 ND ND ND 14,000 ND 1,600 ND ND ND ND ND ND ND ND ND ND ND ND ND 83 ND ND ND ND ND 35,000 ND ND ND 16,000 ND 1,200 ND ND ND ND ND ND ND ND ND ND ND ND ND 620 ND ND ND ND ND 29,000 ND ND ND 17,000 ND 5,000 ND ND A-23 GWN-VR8 Polk GWN-VR10 Murray ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 13 ND ND ND ND ND ND ND 14 ND ND ND ND ND 37,000 ND 26 ND ND ND ND ND 16 ND ND ND ND ND 33,000 ND 36 ND ND ND ND ND 14 ND ND ND ND ND 34,000 ND 31 ND ND ND ND ND 13 ND ND ND ND ND 34,000 ND ND ND ND ND ND ND 48 ND ND ND ND ND 32,000 ND ND ND 17,000 ND ND 15,000 ND ND 16,000 ND ND 17,000 ND ND 14,000 ND 1,700 1,500 1,500 1,500 ND ND ND ND ND ND ND ND 2,600 ND ND 2,022 Table A-9. Analytes, ERA Analytical Methods, and Reporting Limits. Analyte Reporting Limit/ ERA Method Analyte Reporting Limit/ EPAMethod Vinyl Chloride 1,1-Dichloroethylene Dichloromethane Trans-1,2Dichloroethylene Cis-1,2Dichloroethylene 1,1,1-Trichloroethane Carbon Tetrachloride Benzene 0.5 ug/L / 524.2 0.5 ug/L/524.2 0.5 ug/L / 524.2 0.5 ug/L / 524.2 0.5 ug/L / 524.2 0.5 ug/L / 524.2 0.5 ug/L/524.2 0.5 ug/L / 524.2 1,2-Dichloroethane 0.5 ug/L/524.2 Dichlorodifluoromethane Chloromethane 0.5 ug/L / 524.2 0.5 ug/L / 524.2 Bromomethane 0.5 ug/L / 524.2 Chloroethane Fluorotrichloromethane 1,1-Dichloroethane 0.5 ug/L / 524.2 0.5 ug/L / 524.2 0.5 ug/L / 524.2 2,2-Dichloropropane 0.5 ug/L / 524.2 Bromochloromethane 0.5 ug/L / 524.2 Chloroform 0.5 ug/L/524.2 Trichloroethylene 0.5 ug/L / 524.2 1,1-Dichloropropene 0.5 ug/L / 524.2 1,2-Dichloropropane 0.5 ug/L/524.2 Toluene 1,1,2-Trichloroethane T etrachloroethylene 0.5 ug/L / 524.2 0.5 ug/L / 524.2 0.5 ug/L / 524.2 Chlorobenzene 0.5 ug/L/524.2 Ethylbenzene 0.5 ug/L / 524.2 Total Xylenes 0.5 ug/L/524.2 Styrene 0.5 ug/L / 524.2 p-Dichlorobenzene o-Dichlorobenzene 1,2,4-Trichloro benzene 0.5 ug/L / 524.2 0.5 ug/L / 524.2 0.5 ug/L / 524.2 Dibromomethane 0.5 ug/L / 524.2 Bromodichloro methane Cis-1,3-Dichloropropene Trans-1,3Dichloropropene 0.5 ug/L / 524.2 0.5 ug/L / 524.2 0.5 ug/L / 524.2 1,3-Dichloropropane 0.5 ug/L / 524.2 Chlorodibromomethane 0.5 ug/L / 524.2 1,2-Dibromoethane 0.5 ug/L / 524.2 1,1,1,2Tetrachloroethane 0.5 ug/L/524.2 Bromoform 0.5 ug/L / 524.2 Isopropylbenzene 1,1,2,2Tetrachloroethane 0.5 ug/L / 524.2 0.5 ug/L / 524.2 A-24 Table A-9, Continued. Analytes, ERA Analytical Methods, and Reporting Limits. Analyte Reporting Limit/ EPA Method Analyte Reporting Limit/ EPA Method Bromobenzene 1,2,3-Trichloropropane n-Propylbenzene 0.5 ug/L / 524.2 0.5 ug/L / 524.2 0.5 ug/L / 524.2 o-Chlorotoluene 1,3,5-Trimethylbenzene p-Chlorotoluene 0.5 ug/L / 524.2 0.5 ug/L / 524.2 0.5 ug/L / 524.2 Tert-Butylbenzene 1,2,4-Trimethylbenzene Sec-Butylbenzene 0.5 ug/L / 524.2 0.5 ug/L / 524.2 0.5 ug/L / 524.2 p-lscpropyltoluene 0.5 ug/L / 524.2 m-Dichlorobenzene 0.5 ug/L / 524.2 n-Butylbenzene 1,2-Dibrcmo-3chlorcpropane Hexachlorobutadiene Naphthalene 1,2,3-Trichlorobenzene Methyl-tert-butyl ether (MTBE) Chloride 0.5 ug/L / 524.2 0.5 ug/L / 524.2 0.5 ug/L / 524.2 0.5 ug/L / 524.2 0.5 ug/L / 524.2 0.5 ug/L / 524.2 10 mg/L/300.0 Sulfate* Nitrate/nitrite* 10 mg/L/300.0 0.02 mg/L as Nitrogen / 353.2 Total Phosphorus Fluoride Silver Aluminum Arsenic Barium Beryllium Calcium Cobalt Chromium Copper Iron Potassium Magnesium Manganese Sodium Nickel Lead Antimony Selenium 0.02 mg/L/365.1 0.20 mg/L / 300.0 10 ug/L/200.7 (ICP) 60 ug/L / 200.7 80 ug/L / 200.7 10 ug/L/200.7 10 ug/L/200.7 1000 ug/L/200.7 10 ug/L/200.7 20 ug/L / 200.7 20 ug/L / 200.7 20 ug/L / 200.7 5000 ug/L / 200.7 1000 ug/L/200.7 10 ug/L/200.7 1000 ug/L/200.7 20 ug/L / 200.7 90 ug/L / 200.7 120 ug/L/200.7 190 ug/L/200.7 A-25 Table A-9, Continued. EPA Analytical Methods, and Reporting Limits. Analytes and Reporting Limits. Analyte Reporting Limit/ EPA Method Analyte Reporting Limit/ EPA Method Titanium Thallium Vanadium Zinc Chromium Nickel Copper Zinc Arsenic Selenium 10 ug/L/200.7 200 ug/L / 200.7 10 ug/L/200.7 20 ug/L / 200.7 5 ug/L / 200.8 (ICPMS) 10 ug/L/200.8 5 ug/L/200.8 10 ug/L/200.8 5 ug/L/200.8 5 ug/L / 200.8 Molybdenum Silver Cadmium Tin Antimony Barium Thallium Lead Uranium 5 ug/L / 200.8 5 ug/L / 200.8 0.7 ug/L / 200.8 30 ug/L / 200.8 5 ug/L / 200.8 2 ug/L / 200.8 1 ug/L / 200.8 1 ug/L / 200.8 1 ug/L / 200.8 * Note: Reporting limits for sulfate and nitrate/nitrite are subject to change. A sample with a concentration of either analyte greater than certain ranges may need to be diluted to bring the concentration within the analytical ranges of the testing instruments. This dilution results in a proportional increase in the reporting limit. A-26 Table A-10. Analytes, Primary MCLs^A), and Secondary MCLs*^. Analyte Primary MCL Second ary MCL Analyte ,i i Primary Second MCL ary MCL Vinyl Chloride 1,1-Dichloroethylene Dichloromethane Trans-1,2Dichloroethylene Cis-1,2Dichloroethylene 1,1,1-Trichloroethane 2 ug/L 7 ug/L 5 ug/L None None None 100 ug/L None 70 ug/L None 200 ug/L None Carbon Tetrachloride 5 ug/L None Benzene 1,2-Dichloroethane 5 ug/L 5 ug/L None None Trichloroethylene 5 ug/L None 1,2-Dichloro-propane 5 ug/L Toluene 1,1,2-Trichloroethane Tetrachloroethylene 1,000 ug/L 5 ug/L 5 ug/L None None None None Chlorobenzene 100 ug/L None Ethylbenzene Total Xylenes Styrene 700 ug/L 10,000 ug/L 100 ug/L None None None p-Dichlorobenzene o-Dichlorobenzene 1,2,4-Trichlorobenzene Chloroform (1) Bromodichloromethane (2) Chlorodibromomethane (3) Bromoform (4) Chloride Sulfate Nitrate/nitrite Fluoride Aluminum Antimony Arsenic Barium Beryllium Cadmium Chromium 75 ug/L None 600 ug/L None 70 ug/L None Total 1,2,3,4 = 80 ug/L Total 1,2,3,4 = 80 ug/L Total 1,2,3,4 = 80 ug/L Total 1,2,3,4 = 80 ug/L None None 10 mg/L as Nitrogen None None None None 250 mg/L 250 mg/L None 4 mg/L 2 mg/L None 50 -200 ug/L 6 ug/L None 10 ug/L 2000 ug/L 4 ug/L None None None 5 ug/L None 100 ug/L None A-27 Table A-10, Continued. Analytes, Primary MCLs*, and Secondary MCLs*. Analyte Copper Iron Lead Manganese Nickel !Y!Cfi Primary Secondarv MCL Analyte Action level = 1,300 ug/L(C) None Action level = 15 ug/L`c> None 1000 ug/L Selenium 300 ug/L Silver None Thallium 50 ug/L Zinc 100 ug/L None Primary Second- MCL arv MCL 50 ug/L None None 100 ug/L 2 ug/L None None 5,000 ug/L Notes: (A) Primary MCL = Primary Maximum Contaminant Level, a maximum concentration of a substance (other than lead or copper) allowed in public drinking water due to adverse health effects. (B) Secondary MCL = Secondary Maximum Contaminant Level, a maximum concentration of a substance suggested for public drinking water due solely to unpleasant characteristics such as bad flavor or stain-causing ability. (C) Action Level = the maximum concentrations of lead or copper permitted for public drinking water as measured at the user's end of the system. Water issuing from at least ninety percent of a representative sample of user's end outlets must contain copper or lead concentrations at or below their respective action levels. mg/L = milligrams per liter. ug/L = micrograms per liter. A-28 The Department of Natural Resources is an equal opportunity employer and offers all persons the opportunity to compete and participate in each area of DNR employment regardless of race, color, religion, national origin, age, handicap, or other non-merit factors.