ARCHIVED REPORTS_XR0007385 CASE 1

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kn KLEINFELDER 6 CONCLUSIONS AND RECOMMENDATIONS 1 6.1. CONCLUSIONS Groundwater elevations ranged from a maximum of 0 42 feet above mean sea level (msl) at MW-4 to a minimum of —0 58 feet below msl at MW-2 Depth to water was measured at approximately 40 35 to 39 68 feet bgs Groundwater flow was calculated to be southwest with an approximate gradient of 0 003 ft/ft No product or sheen was observed from groundwater from perimeter monitoring wells !� MW-2, MW-3, and MW-4 None of the requested petroleum constituents were detected in the groundwater samples collected from the down-gradient monitoring wells, MW-2 and MW-3, or in the upgradient well MW-4 Based on the information obtained, It Is Kleinfelder's opinion that the groundwater contaminant plume is located In the vicinity of MW-1 and the existing UST area, and is apparently contained within perimeter monitoring wells MW-2, MW-3 and MW-4 A petroleum product layer has been detected on the surface of groundwater in monitoring well MWA from the third quarter 2002 to the second quarter 2005 quarterly sampling events at thicknesses ranging from a film (<0 01 feet) to approximately 0 33 feet (approximately 4 inches) During the third quarter of 2005 a product skimmer was installed in MWA and therefore a groundwater sample was not collected from this well Floating product was not detected In the initial five groundwater sampling events beginning In June 2000 through June 2002 6.2. RECOMMENDATIONS Based on the data obtained during this assessment, Kleinfelder makes the following recommendations 1 Continue quarterly groundwater monitoring of the existing wells MW-2, MW-3, and MW4 Kleinfelder is not recommending additional sampling of MWA while product is still being noted and since a product skimmer has been installed 2 Kleinfelder recommends that a copy of this report be submitted to SJCIEHD and the CVRWQCB for their review and comment 28209 T09/ST06R1601CD Iv Page 9 of 12 0 2006 Klewelder, Inc February 15, 2006