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r <br /> r <br /> Geofogicaf Technics Inc. <br /> r 2741 River Rgad <br /> Modesto,Ca&fornia 35351 <br /> (209)538-6424IFax*538-5852 <br /> r <br /> r REPORT <br /> Groundwater Monitoring <br /> r Winter Quarter 1998199 <br /> iValentine (Castle Motors) <br /> 2315 N. El Dorado St. <br /> rStockton, CA <br /> rProject No 723 2 <br /> June 4, 1999 <br /> I • <br /> EXECUTIVE SUMMARY <br /> This report summarizes the Winter Quarter 1998/99 round of groundwater monitoring and <br /> testing that took place on January 25, 1999 The test results show that detectable <br /> rconcentrations of the aromatic hydrocarbon compounds (BTEX) and gasoline range <br /> petroleum hydrocarbons (TPH-G) are present in the six monitoring wells on site <br /> r Concentrations have increased dramatically in MW-2 since the last event Concentrations in <br /> the other wells remained consistent with those observed during the history of the site MTBE <br /> was not detected in any of the wells <br /> The groundwater level dropped approximately 0 3 feet since the June 1998 monitoring event <br /> Groundwater gradient calculations show that groundwater flow is N58°E at 0 0202 ft/ft <br /> I <br /> 1.0 GROUNDWATER MONITORING <br /> r1.1 Hydrogeology of Site <br /> A site-specific groundwater gradient and bearing was calculated from the depth to water <br /> measurements taken during the groundwater monitoring The gradient was 0 0202 ft/ft <br /> flowing N58°E This is the first event where a site specific groundwater gradient was <br /> r <br /> r <br />