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lv 1•, <br /> Ms. Laurie A. Cotulla <br /> May 8, 1991 <br /> Page Three <br /> have no observable effect on the gradient of the shallow aquifer <br /> that is the subject of investigation at this site. The disposi- <br /> tion of the production wells is beyond the scope of this investi- <br /> gation. 's <br /> I r <br /> 4) We will identify the leach lines and provide you with a heap <br /> showing their location. ° <br /> In conclusion, although low levels of <br /> g petroleum hydrocarbon <br /> constituents may be present in soils within the capillary fringe <br /> in the area of former tank #3, this has had no deleterious effect <br /> on groundwater quality. Petroleum hydrocarbon constituents in <br /> groundwater within the four monitoring wells located on-site, <br /> including MW-4 immediately downgradient of the former tank pit, <br /> have been only sporadically detected over a period of one and one <br /> half years of monitoring and have remained several orders of F <br /> magnitude below State MCLS. The single exception to this was the <br /> initial sample collected from MW-4 on 5/22/90. Subsequent sam- <br /> pling and analysis has shown that the sample was not representa- <br /> tive. of undisturbed groundwater. <br /> Subsurface investigation and groundwater monitoring have satis- <br /> F faotorally demonstrated that the waters of the State have not <br /> been adversly affected at this site. Case closure is recommend- <br /> ed. <br /> Please direct your questions or comments to the undersigned. We <br /> are anticipating your prompt response in concurrence with our <br /> recommendations. = <br /> Respectfully, <br /> WaterWork <br /> Gregory P. Stahl, zz <br /> Project Geologist } <br /> i 1 <br /> Nora H. Kataoka, <br /> CA Registered Civil Engineer No. 38322 <br /> cc Bill Keller <br /> 1 <br /> CRWQCB <br />