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4 <br /> �"� KLEINFELDER <br /> r <br /> 6. CONCLUSIONS AND RECOMMENDATIONS <br /> I 61. CONCLUSIONS <br /> Groundwater elevations ranged from a maximum of 1 28 feet above mean sea level <br /> (msl) at MW-4 to a minimum of —0 19 feet below msl at MW-2 Depth to water was <br /> measured at approximately 39 86 to 38 82 feet bgs Groundwater flow was calculated <br /> to be south by southwest with an approximate gradient of 0 005 ft/ft <br /> No product or sheen was observed from groundwater from perimeter monitoring wells <br /> MW-2, MW-3, and MW-4 <br /> None of the requested petroleum constituents were detected in the groundwater <br /> samples collected from the down-gradient monitoring wells, MW-2 and MW-3, or in the <br /> upgradient well MW-4 <br /> Based on the information obtained, It Is Klelnfelder's opinion that the groundwater <br /> contaminant plume is located In the vicinity of MW-1 and the existing UST area, and Is <br /> apparently contained within perimeter monitoring wells MW-2, MW-3 and MW4 A <br /> petroleum product layer has been detected on the surface of groundwater in monitoring <br /> well MW-1 over the last eleven quarterly sampling events at thicknesses ranging from a <br /> film (<0 01 feet) to approximately 33 feet (4 Inches) During the third quarter of 2005 a <br /> product skimmer was Installed In MW-1 and therefore a groundwater sample was not <br /> collected from this well Floating product was not detected In the Initial five groundwater <br /> sampling events beginning In June 2000 through June 2002 <br /> 6 2 RECOMMENDATIONS <br /> Based on the data obtained during this assessment, Kleinfelder makes the following <br /> recommendations <br /> 1 Continue quarterly groundwater monitoring of the existing wells MW-2, MW-3, and <br /> MW-4 Kleinfelder is not recommending additional sampling of MW-1 while <br /> product is still being noted and since a product skimmer has been Installed <br /> 2 Kleinfelder recommends that a copy of this report be submitted to SJCIEHD and <br /> the CVRWQCB for their review and comment <br /> 3 The purge water currently stored on-site should be evaluated and properly <br /> disposed of by the Client Kleinfelder can assist the Client In the disposal process <br /> at an additional charge if requested by the client <br /> 28209 T091ST05R14541DH Iv Page 9 of 12 <br /> ©2005, Kleinfelder, Inc November 30, 2005 <br />