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i l <br /> Ceolocal -echiics tAC. <br /> 1 101 714 Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> REPORT <br /> k I <br /> Groundwater Monitoring <br /> 2°d <br /> Quarter 2002 <br /> Valentine (Castle Motors) <br /> 2315 N. El Dorado St. <br /> ' Stockton, CA # <br /> Project No, 723.2 <br /> k <br /> September 30, 2002 , <br /> 4 k <br /> iJ <br /> EXECUTIVE SUMMARY <br /> 4 This report summarizes the 2" Quarter 2002 round of groundwater monitoring and testing <br /> that took place on June 6, 2002. The laboratory results indicate that detectable <br /> f concentrations of the. aromatic hydrocarbon compounds (BTEX) and gasoline range <br /> petrolewn hydrocarbons (TPH-G) are present in all eight monitoring wells on site. <br /> The groundwater elevation averaged —20.33 feet mean sea level in the wells.and this <br /> corresponds to about 31 feet below grade surface (bgs). This elevation is a decrease of <br /> approximately 0.4 feet since the February 27, 2002 monitoring event... Groundwater <br /> gradient calculations show that groundwater flow is N75°E at 0.0042 MI. This is <br /> consistent with the site's historical directions that have been predominantly to the northeast. <br /> 1.0 ' GROUNDWATER MONITORING_Ltr <br /> 11 Hydrogeology of Site <br /> A site-specific groundwater gradient and bearing were calculated from computer generated <br /> s o <br /> contours. The groundwater was flowing N75 E at a gradient of 0.0042 ft/fi. The average <br /> elevation of groundwater at the site was 20.33 feet below mean sea level. Depths to water <br />