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1 <br /> Geofogica(Technics Inc. <br /> 2741�R—R-d <br /> Mato,CaCfomia 95351 <br /> (20 9)538-6424/jaX#538-5852 <br /> 1 <br /> REPORT <br /> r <br /> Groundwater Monitoring <br /> 2"d Quarter 2000 <br /> Valentine (Castle Motors) <br /> 2315 N. El Dorado St. <br /> Stockton, CA <br /> Project No 723 2 <br /> June 29, 2000 <br /> r <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 2"d Quarter 2000 round of groundwater monitoring and testing <br />' that took place on May 4, 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 /> • Concentrations continue to exhibit an increasing trend in wells MW-2, MW-3 and MW-5 <br /> • None of the oxygenated fuel compounds were detected, however detection limits were <br /> elevated due to interference from BTEX and TPH-G <br /> • Contaminant concentrations did not exceed the laboratory reporting limits in the old <br /> domestic well located at 60 East Castle The well has previously contained trace amounts <br />' of Toluene and Xylene and low concentrations of TPH-G <br /> The groundwater elevations increased approximately 3 18 feet since the December 16, 1999 <br /> monitoring event Groundwater gradient calculations show that groundwater flow is N70°E <br /> at 0 0033 ft/ft <br /> r <br /> r <br /> r <br /> r <br />