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IL <br /> Geofogicaf rIechncs Inc. <br /> 2741 River Road <br /> rModrito,caCfomia 95351 <br /> (209)538-6424/FaX#538-58520 <br /> 4 REPORT <br /> Groundwater Monitoring <br /> 4"' Quarter 1999 <br /> Valentine (Castle Motors) <br /> 2315 N. EI Dorado St: <br /> Stockton, CA — <br /> vi <br /> Project No. 723.2 <br /> January 19, 2000 <br /> f <br /> EXECUTIVE SUMMARY ` <br /> ccs J <br /> This report summarizes the 4' Quarter. 1999 round of groundwater monitoring and testing <br /> that took place on December 16,"199 9. The test results show that: C <br /> • Detectabl,'e concentrations of the aromatic'hydrocarbon compounds (BTEX) and gasoline <br /> r <br /> range petroleum hydrocarbons (TPH-G) are present in all seven monitoring wells on site. <br /> • Concentrations continue to increase in 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 /> - • The old domestic well located at 60 East Castle showed the presence of trace amounts of <br /> Toluene and Xylene and low levels of TPH-G. <br /> - The groundwater level dropped approximately 0.6 feet since the September 13, 1999 <br /> ' monitoring event. Groundwater gradient calculations show that groundwater flow is N66°E <br /> at 0.0029 ft/ft. <br />