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000109 cal TCChA*S 1KC. <br /> ' 2741 River Road <br /> Modesto,California 95351 <br /> (209)538-6424/Fax#538-5852 <br /> REPORT <br /> ' Groundwater Monitoring <br /> 3rd Quarter 2001 <br /> Valentine (Castle Motors) <br /> 2315 N. El Dorado St. <br /> Stockton, CA <br /> Project No 723 2 <br /> ' November 7, 2001 <br /> EXECUTIVE SUMMARY <br /> ' This report summarizes the Y4 Quarter 2001 round of groundwater monitoring and testing <br /> that took place on September 12, 2001 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 seven monitoring wells on site <br /> The groundwater elevations decreased approximately 2 99 feet since the June 25, 2001 <br /> ' monitoring event Groundwater gradient calculations show that groundwater flow is N70°E <br /> at 0 0058 ft/ft This is consistent with the site's historical directions that have been <br /> ' predominantly to the northeast <br /> 1.0 GROUNDWATER MONITORING <br /> r <br /> 1.1 Hydrogeology of Site <br /> A site-specific groundwater gradient and bearing was calculated from computer software <br /> generated contours The gradient was 0 0058 ft/ft flowing N70°E The average elevation of <br /> groundwater under the site was 21 32 feet below mean sea level Depths to water ranged <br /> from 31 25 — 32 15 feet bgs <br />