In ]984 and 1985, a quasi thrcc-dJmcnsiona! groundwater flow model was developed for the A/M Area (Savannah River Laboratory Comp|ex) of the Savannah River Site to assist in the design of a groundwater recovery well network to rcmediate groundwater contaminated with chlorlnatcd hydrocarbon solvents. In ]986, the c×isting groundwater flow model was used to ¢va|uatc the effectiveness of groundwater remediation systems. Since the original mode! was developed, additional monitoring wells have been installed, the understanding of the hydrogeologic system has improved and the horizontal and vertical extent of the contamination in the groundwater systems has been better defined. The objective of this study is to update and improve the existing A/M Area groundwater flow model by incorporating recent hydrologic information. The new model is calibrated to 1989-1990 groundwater levels and surface water flows. The model area is approximately 31 square miles and encompasses a manufacturing and processing area designated the A/M Area, a previous waste effluent disposal basin and overflow to a natural depression (Lost Lake), and several surface water features. The simulations are run on a 80386-based personal computer using the public-domain groundwater flow code MODFLOW.This calibrated coarse-grid model is a base model. Specific areas of interest can be further discritized to provide more detailed and accurate water level elevations for use in particle tracking and capture analysis. The particle tracking and capture analysis are used to evaluate the ground_vater contamination capture and removal capacity of proposed recovery wells.

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Abstract. This project involves the purification of reclaimed and excess surface waters by treatment through natural processes on reclaimed lands previously mined by phosphate mining companies. As a result of the mining process, the phosphate companies leave behind open mine pits, clay settling areas (CSA), and tailing sand deposits (TSD). The companies are required to reclaim the mined areas as land and lakes, wetlands, and/or pasture and agricultural lands. The basis for this project is the assumption that the natural systems, in particular, wetlands, created on reclaimed CSA's followed by tailing sand filtration, will remove any organic, inorganic and microbiological contaminants in surface waters and waste waters, resulting in water that will meet drinking water standards. To store the water, the project envisions recharge to the underlying Floridan Aquifer, a regionally exteusive limestone confined ground-water system, capable of storing and transmitting large quantities of water. The projects in support of this concept have been funded by the Florida Institute of Phosphate Research. Studies have been completed on the radiological and microorganism aspects of the percolation of water through tailing sand deposits. This paper will present the results of the studies conducted so far and will describe in detail the ongoing pilot project now being constructed at a site owned and operated by Florida Power Corporation. A feasibility study has identified five project sites where a total of 7 4 million gallons per day could be harvested, treated and recharged to the Floridan Aquifer at an average cost of$ 1.1 O per 1000 gallons. This augmentation fits well in the overall regional water resources management plan for the Southern Water Use Caution Area, in which an increase of350 MGD in the regional supply to meet agricultural, industrial and public water supply demands is projected for the year 2020.Additional Keywords: Water supply development, natural treatment, surface water diversion, ground water recharge.

A visual selection technique can be utilized to locate potential well field sites prior to on‐site testing. The technique is based upon an understanding of the regional hydrology and an appreciation for development goals such as the identification of high‐yield and low‐impact locations. Although the uniqueness of Pasco, Pinellas, and Hillsborough Counties in Western Florida has been incorporated into the current application, the methodology, with modifications, is transferable to other geographic regions. Overlays of each criterion used in site selection are combined to form a regional composite showing favorable site locations and further serve a useful communications role as visual aids during public presentation. Implications of direct and indirect cost savings to the public are obtained when the methodology is applied to the location of municipal well fields.