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NAVCOM 4 30 August 1990 <br /> 6) Interconnection of shallow and intermediate zones; <br /> 7) _ Effect of pumping station/storm drain system upon water quality in Burns <br /> Cutoff; <br /> 8) Improved understanding of stratigraphic zones and soil quality; <br /> 9) Improved understanding of ground water and surface water quality; <br /> 10) Confirmation of vertical migration of VOCs from shallow to intermediate <br /> zones; <br /> 11) Depth of ground water below which surface drainage ceases to govern ground <br /> water flow; and <br /> 12) Calculation of aquifer hydraulic parameters. <br /> The MARK Group has recommended that the following work elements be performed to fill <br /> the data gaps identified above: <br /> 1) Evaluation of the hydraulic conductivity between Burns Cutoff and the around <br /> water. <br /> Tasks include a tidal study, installation of piezometers, and water level <br /> measurements. Tidal effects, storm events, and long term seasonal effects <br /> will be evaluated. <br /> 2) Evaluation of the offsite migration of chemical constituents. <br /> Six additional shallow and intermediate zone monitoring well clusters (two <br /> piezometers and ten wells) will be installed in the landfill area (Area 1) . <br /> These wells and existing well clusters (W14-15, W9-10, and W11-12) will be <br /> sampled four times for VOCs, twice during the wet season and twice during <br /> the dry season, and water level measurements will be taken monthly. In <br /> addition, monthly water samples of the Burns Cutoff will be taken and <br /> analyzed for VOCs . <br /> Two additional well clusters will be installed in the vicinity of the fire <br /> fighting burn pit (Area 3) . These wells and the existing wells W1 and W2 <br /> will be sampled for VOCs. <br /> 3) Determination of the regional ground water flow. <br /> Four additional piezometers and one additional monitoring well will be <br /> installed in the intermediate zone. Hence, 10 intermediate wells (includes <br /> five existing wells) will be used to determine regional ground water flow <br /> characteristics. Monthly water level measurements will be taken for six <br /> months from these intermediate zone monitoring wells. <br />