Hydrogeology and Groundwater Quality of Highlands ... - USGS

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50 Hydrogeology and Groundwater Quality of Highlands County, Florida 27°30’ 27°15’ 27°00’ HARDEE COUNTY 21 DESOTO COUNTY CHARLOTTE COUNTY POLK COUNTY Avon Park 68 54 30 30 0.20 54 27 63 Sebring 98 5.3 7.4 76 HIGHLANDS COUNTY 17 45 Lake Placid 30 69 0.20 Figure 38. Generalized distribution of sulfate concentrations in water from the surficial aquifer. Concentrations of nitrate in groundwater underlying undeveloped areas generally are low, indicating that natural sources of nitrate do not contribute substantially to concentrations in groundwater. Nitrate concentrations of water samples underlying the Ocala National Forest in Lake and Marion Counties were less than 1.0 mg/L (Adamski and Knowles, 2001). Water samples collected from the surficial aquifer beneath undeveloped land at two sites in Polk and Highlands Counties had concentrations of less than 0.002 mg/L (Tihansky and Sacks, 1997). Likely sources of nitrate in these undeveloped areas are usually organic matter in soils and atmospheric deposition. In central Florida, the concentration of nitrate in rainwater generally is less than 1.0 mg/L (Adamski and German, 2004). 81°30’ 81°15’ 81°00’ Kuhlman 1.8 7.0 2.1 0.20 87 39 40 1.9 7.1 17 16 2.0 Archbold Biological Station 29 51 2.0 51 3.9 Venus Base modified from U.S. Geological Survey digital data, 1:100,000, 1985 Albers NAD projection 1983 0 0 27 44 9.8 Lorida 0.23 5 10MILES 5 10KILOMETERS 70 98 2.8 GLADES COUNTY 1.0 36 Brighton EXPLANATION SULFATE CONCENTRATION, IN MILLIGRAMS PER LITER < 10 10 - 29 30 or greater 30 Cornwell OSCEOLA COUNTY OKEECHOBEE COUNTY 30 WELL – Number indicates sulfate concentration Other nutrients of interest in the study area are orthophosphate and phosphorus. Concentrations of dissolved orthophosphate in water from the surficial aquifer in Highlands County ranged from 0.004 to 4.5 mg/L, with a median value of 0.027 mg/L. Phosphorous concentrations ranged from 0.004 to 5.2 mg/L, with a median value of 0.016 mg/L (app. 3 and table 3). Orthophosphate concentrations are typically low in the surficial aquifer because phosphate-bearing minerals are generally uncommon in the surficial aquifer (at least in the upper part). In addition, because of the ability of phosphate ions to sorb onto metal oxides, especially ferric and manganese oxyhydroxides, background concentrations in water greater than a 0.87 0.20
27°30’ 27°15’ 27°00’ HARDEE COUNTY
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Prepared in cooperation with Highla
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Hydrogeology and Groundwater Qualit
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Acknowledgments The author grateful
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vi Appendix 1. Inventory of wells u
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Page 82 and 83: Appendix 1. Inventory of wells used
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Hydrogeology and Groundwater Quality of Highlands ... - USGS

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