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r <br /> 16 CONCLUSIONS <br /> rAnalytical results show a significant decreasing trend of petroleum hydrocarbons concentrations <br /> in the upgradient and downgradient wells Beyond a single detection of xylenes at 1 1 ug/L in <br /> ' MW-2 during the Apnl 2004 sampling event, MTBE has been the only constituent detected in <br /> the groundwater samples since June 2000 Therefore, MTBE appears to be the primary <br /> constituent of concern at the site <br /> Klemfelder compared the October 14, 2004 concentrations of MTBE detected in the groundwater <br /> samples to the 2003 Water Quality Goals set by the California EPA and the Regional Water <br /> Quality Control Board (RWQCB) Maximum contaminant levels (MCLs) are "enforceable <br /> standards"for human health protection from chemicals in drinking water <br /> • MTBE was detected in MW-1, MW-2, and MW-3 ranging from 0 75 ug/1 to 15 ug/L <br /> The detected concentrations were below the MCL for MTBE established at 13 ug/L <br /> October 14, 2004 marked the third quarterly sampling event of the deep well MW-4 During <br /> each sampling event petroleum hydrocarbons have not been detected above laboratory reporting <br /> limits Monitoring well MW-4 was placed downgradient of the former UST and should provide <br /> qualitative data related to potential impacts to the deep groundwater zone <br /> SWRCB UST Program—AB2886 (Electronic Reporting) Compliance <br /> The wells were surveyed on October 27, 2004 in accordance with the SWRCB UST Program — <br /> AB2886 (Electronic Reporting) regulations All required data have been submitted and are <br /> currently up to date Confirmation numbers for each submittal as shown in Geotracker are <br /> included in Appendix E Kleinfelder electronically submitted the following data to the SWRCB <br /> through Geotracker <br /> • Analytical Laboratory Results (a k a EDF) <br /> o April 1, 2004 (MW-4 soil sampling results) <br /> o April 7, 2004 (MW-1 through MW-4 groundwater sampling results) <br /> o August 13, 2004 (MW-1 through MW-4 groundwater sampling results) <br /> o October 13, 2004 (MW-1 through MW-4 groundwater sampling results) <br /> o October 14, 2004 (MW-1 through MW-4 groundwater sampling results <br /> r • Water Levels (a k a Geo Well) <br /> o June 28,2000 <br /> o October 31, 2000 <br /> o April 7, 2004 <br /> o August 13, 2004 <br /> ' o October 13, 2004 <br /> o October 14, 2004 <br /> ' • Well Survey—Latitude and Longitude (a k a Geo XY) <br /> o October 27, 2004 <br /> 49014-1/SAC4R482 Page 4 of 6 November 18,2004 <br /> Copyngbt 2004 Kletnfelder,Inc <br /> KLEINFELDER 3077 Fite Circle,Sacramento, CA 95827-1815 (916) 366-1701 (916)366 7013 fax <br />