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Geological Technics W. <br /> ' 2741 River Road <br /> Modesto California 95351 <br /> (209)538-6424/Fax 4 538-5852 <br /> ' LL REPORT r <br /> ' Groundwater Monitoring <br /> 3rd Quarter 2001 <br /> George's Service <br /> 1600 Durham Ferry Road <br /> ' Tracy, California <br /> Project No 425 2 <br /> ' November 12, 2001 <br /> MEXECUTIVE SUMMARY <br /> ' This report summarizes the 3' Quarter 2001 groundwater monitoring and testing that was <br /> completed on September 7, 2001 <br /> Groundwater gradients and bearings were calculated and are summarized as follows <br /> • Water table 0 0017 ft/ft at N08°W <br /> ' • Intermediate 0 016 ft/ft at S48°E <br /> The analytical results from the September 7, 2001 monitoring event show that aromatic <br /> ' hydrocarbon compounds (BTEX) and gasoline range petroleum hydrocarbons (TPH-G) are <br /> present in 4 of the 12 monitoring wells (MW-1, MW-2, MW-4, and MW-5) Three <br /> domestic water wells in the immediate area of the tanks were tested and none of the wells <br /> ' contained contaminant concentrations above the laboratory detection limits <br /> A summary of findings include <br /> ' 1 Hydrogeology <br /> • The predominant groundwater gradient direction for the shallow aquifer was to the <br /> north from May 1995 to May 1998 After this period the direction has trended to the <br /> northeast For the September 7, 2001 event, the direction was calculated to the north <br /> . which is consistent with historical data <br />