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Ceologkat Technics Inc. <br /> I 10 1 Th Street <br /> Modesto,California 95354 <br /> ' (209)522-4119/Fax(209)522-4227 <br /> REPORT <br /> ' Groundwater Monitoring <br /> 3rd Quarter 2002 <br /> ' Valentine (Castle Motors) <br /> 2315 N. EI Dorado St. <br /> ' Stockton, CA <br /> ' Project No 723 2 <br /> December 17, 2002 <br /> EXECUTIVE SUMMARY <br /> ' This report summarizes the 3`d Quarter 2002 round of groundwater monitoring and testing <br /> that took place on September 9, 2002 The laboratory results indicate that detectable <br /> concentrations of the aromatic hydrocarbon compounds (BTEX) and gasoline range <br /> petroleum hydrocarbons (TPH-G) are present in all eight monitoring wells on site <br /> ' The groundwater elevation averaged --24 62 feet mean sea level in the wells and this <br /> corresponds to about 35 feet below grade surface (bgs) This elevation is a decrease of <br /> approximately 4 29 feet since the June 6, 2002 monitoring event Groundwater gradient <br /> ' calculations show that groundwater flow is N62°E at 0 0061 ft/ft This is consistent with the <br /> site's historical directions that have beenn predominantly to the northeast <br /> ' <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 N62°E at a gradient of 0 0061 ft/ft The average <br /> elevation of groundwater at the site was 20 33 feet below mean sea level Depths to water <br /> 1 <br />