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P <br /> i " <br /> Inc.. <br /> Geol ogicat 7ec/t/tIcs <br /> 1 101 7"'Street <br /> Modesto,California 95354 <br /> (209)522-411 9/Fax(209)522-4227 <br /> �II <br /> 7 � <br /> REPORT <br /> Groundwater Monitoring <br /> 4"' Quarter 2002 ` <br /> Valentine (Castle Motors) <br /> 2315 N. El Dorado St.' <br /> Stockton, CA <br /> !. Project No. 723.2 <br /> March 10, 2003 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 4"' Quarter 2002 round of groundwater rnonitoring and testing <br /> that took place on December 17, 2002. The laboratory results indicate that detectable 1 <br /> concentrations of the aromatic hydrocarbon compounds (BTEX) and gasoline range <br /> petroleum hydrocarbons (TPH-G) are present in seven of eight monitoring wells on site. <br /> The groundwater elevation averaged --24.52 feet mean sea level in the wells and this <br /> corresponds to about 35 feet below grade surface (bgs). This elevation is an increase of <br />' approximately 0.1 feet since the September 9, 2002 monitoring event. Groundwater <br /> gradient calculations show that groundwater flow is N71°E at 0.0053 ft/ft. This is <br /> consistent with the site's historical directions that have been predominantly to the northeast. <br /> r <br /> 1.0 GROUNDWATER MONITORING <br /> 1.1 Hydrogeology of Site <br /> A site-specific groundwater gradient and bearing were calculated from computer-generated <br /> contours. The groundwater was flowing N7 1'F at a gradient of 0.0053 ft/ft. The average <br /> ti <br /> elevation of groundwater at the site was 24.52 feet below mean sea level. Depths to water 1, <br /> rf <br />