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1 <br /> Geofogica(Technicls Inc. <br />' 2741 River Road <br /> Modesto,CaCiforma 95351 <br /> (209)538 6424/FaX#538-5852 <br /> REPORT <br /> Groundwater Monitoring <br /> 3"d Quarter 2000 <br />' Valentine (Castle Motors) <br /> 2315 N. El Dorado St. <br /> Stockton, CA <br /> Project No 723 2 <br /> September 13, 2000 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 3`d Quarter 2000 round of groundwater monitoring and testing <br /> that took place on August 29, 2000 The test results show that <br /> • Detectable concentrations of the aromatic hydrocarbon compounds (BTEX) and gasoline <br /> range petroleum hydrocarbons (TPH-G) are present in all seven monitoring wells on site <br /> • MTBE was detected in one well, MW-5, at 1100 ug/l <br /> • Contaminant concentrations did not exceed the laboratory reporting limits for the second <br /> consecutive event in the domestic well located at 60 East Castle The well has previously <br /> contained trace amounts of Toluene and Xylene and low concentrations of TPH-G <br /> The groundwater elevations decreased approximately 2 16 feet since the May 5, 2000 <br /> monitoring event Groundwater gradient calculations show that groundwater flow is N82°E <br /> at 0 0046 ft/ft <br /> 1 <br /> i <br /> 1 <br />