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1 <br /> 1 <br /> 1 <br /> Ceoto ical Technics W. <br /> 101 7`h Street <br /> Modesto,California 95354 <br />' (209)522-4119/l;ax(209)522-4227 <br /> 1 REPORT <br /> 1 Groundwater Monitoring 5f <br /> 1 Quarter 2002 <br /> ' Valentine (Castle Motors) <br /> 2315 N. El Dorado St. <br /> ' Stockton, CA <br /> ' Project No 723 2 <br /> May 15, 2002 <br /> EXECUTIVE SUMMARY <br /> ' This report summarizes the 151 Quarter 2002 round of groundwater monitoring and testing <br /> that took place on February 27, 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 /> 1 The groundwater elevation averaged --19 93 feet mean sea level in the wells and this <br /> corresponds to about 30 feet below grade surface (bgs) This elevation is an increase of <br /> approximately 2 16 feet since the monitoring event of February 11, 2001 Groundwater <br /> ' gradient calculations show that groundwater flow is N87E at 0 0065 ft/ft This is <br /> consistent with the site's historical directions that have been predominantly to the northeast <br /> ' 1.0 GROUNDWATER MONITORING <br /> 1 11 Hydrogeology of Site <br /> A site-specific groundwater gradient and bearing were calculated from computer generated <br /> ' contours The groundwater was flowing N87E at a gradient of 0 0065 ft/ft The average <br /> elevation of groundwater at the site was 19 93 feet below mean sea level Depths to water <br />