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16 <br /> Geological Teclfitcs kc. <br /> 1 10 1 7`h Street <br /> Modesto,California 95354 <br /> ' (209) 522-4119/Fax (209)522-4227 <br /> REPORT <br /> ' Groundwater Monitoring <br /> V Quarter 2003 <br /> Valentine (Castle Motors) <br /> 2315 N. El Dorado St. <br /> ' Stockton, CA <br /> Project No 723 2 <br /> April 18, 2003 <br /> EXECUTIVE SUMMARY <br />' This report summarizes the 151 Quarter 2003 round of groundwater monitoring and testing <br /> that took place on March 5, 2003 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 seven of eight monitoring wells on site <br />' The groundwater elevation averaged —22 73 feet mean sea level in the wells and this <br /> corresponds to about 33 feet below grade surface (bgs) This elevation is an increase of <br /> approximately 1 79 feet since the December 17, 2002 monitoring event Groundwater <br /> gradient calculations show that groundwater flow is N77°E at 0 0045 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 1 Hydrogeology of Site <br /> A site-specific groundwater gradient and bearing were calculated from computer-generated <br />' contours The groundwater was flowing N77E at a gradient of 0 0045 ft/ft The average <br /> elevation of groundwater at the site was 22 73 feet below mean sea level Depths to water <br />