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Geofogica[Technics Inc. <br />' 2741 RuerRoad <br /> Modesto,CaCfomia 95351 <br /> (2179)538-6424/jax#538-5852 <br />' REPORT <br /> Groundwater Monitoring <br />' Fall Quarter 1999 <br />' Valentine (Castle Motors) <br /> 2315 N. El Dorado St. <br />' Stockton, CA <br /> Project No 723 2 <br /> December 6, 1999 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the Fall Quarter 1999 round of groundwater monitoring and testing <br /> that took place on September 13, 1999 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 increase in MW-1, MW-2, MW-5 and MW-6 <br /> • MTBE was detected in all of the monitoring wells, however confirmation testing by EPA <br /> method 8260B did not show the presence of MTBE <br /> 0 DIPE is present in MW-3 and TBA is present in MW-4 by EPA 8260B <br /> • The old domestic well located at 60 East Castle showed the presence of trace amounts of <br /> Toluene and Xylene <br /> The groundwater level dropped approximately 0 2 feet since the January 25, 1999 monitoring <br /> event Groundwater gradient calculations show that groundwater flow is N85°E at 0 0033 <br /> ft/ft <br /> I <br />