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NAVCOM 5 30 August 1990 <br /> 4) _ Assessment of the influence of the storm drain system upon Burns Cutoff and <br /> the ground water. <br /> Effluent samples from the pumping station will be taken monthly for six <br /> months and analyzed for VOCs. In addition, flow records of the pump <br /> station, and water level measurements in the storm drain channels and nearby <br /> - shallow monitoring wells will be correlated to determine if the storm drain <br /> system is dewatering the water table aquifer. Five surface water gauging <br /> stations will be installed, two in Burns Cutoff, one in an onsite duck pond, <br /> and two within the lower reaches of the drainage system. <br /> Three additional piezometer clusters, each containing three piezometers, <br /> will be installed in Area 1 . These clusters will be used to determine the <br /> relationships between ground water flow and the interior drainage ditch, <br /> including vertical gradients and the dewatering depths of the drainage <br /> system, and effects of tidal fluctuations. <br /> 5) Investigation of the interconnection of the upper and intermediate water <br /> bearing zones. <br /> Two 6-inch diameter wells will be installed in the vicinity of the <br /> piezometer clusters one in the shallow zone and the other in the <br /> intermediate zone. Pump tests will be conducted on these wells to determine <br /> the hydraulic characteristics of each zone and the intervening aquitard. <br /> Slug tests will be conducted in 15 wells and piezometers. <br /> 6) Improve the soil stratigraphy database <br /> All borings will be continuously logged. Select samples will also be taken <br /> for chemical (VOC) and physical (sieve analysis) testing. <br /> I have the following comments on this workplan. <br /> 1) Since the sampling of the ground water is very limited and dated (only <br /> sampled once in late 1986/87) , the MARK Group correctly concludes that this <br /> data is insufficient to gauge the quality of the ground water (page 2-4) . <br /> Yet, they recommend that further sampling be limited to VOCs only. <br /> Additional chemical analyses appears appropriate based upon these <br /> K1einfe1der findings:r�� zyv,.6k OLf 04 Q �klloL) <br /> a) Landfill area wells having arsenic and selenium levels in excess of <br /> MCLS, and specific conductance levels of around 3000 micromhos/cm, <br /> and chloride and sulfate levels as high as 8000 to 1500 mg/1 <br /> r spe ively- <br /> b) ell -lr in he Fire Fighting g g area having arsenic and chloride <br /> levels of 300 ppb and 2170 mg/l respectively. In addition, <br /> petroleum odors and sheens were noticed in ground water samples from <br /> this area. Therefore, total petroleum hydrocarbon scans and BTXE <br /> TVI 0-y-E:- <br />