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GeofiogicafTechnics Inc. <br />' 2741 R}vu Roar! <br /> Modesto,Cafeforma 9535I <br /> (209)538-6424/Yax#538-5852 <br /> REPORT <br /> Groundwater Monitoring <br />' 3' & 4" Quarters 1999 <br /> George's Service <br /> t1600 Durham Ferry Road <br /> Tracy, California <br /> Project No 425 2 <br /> February 17, 2000 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 3r6 & 4`h Quarters 1999 groundwater monitoring and testing that <br /> took place on September 1, and December 22, 1999 <br /> Groundwater gradients and bearings were calculated for both events The gradients and <br /> ' bearings are summarized as follows <br /> • September water table 0 0023 ft/ft at N11°E <br /> 1 • December water table 0 0015 ft/ft at N57°E <br /> • September intermediate 0 0034 ft/ft at N84°E <br /> • December intermediate 0 0016 ft/ft at N630E <br /> ' The test results from the September 1999 monitoring show that aromatic hydrocarbon <br /> compounds (BTEX) and gasoline range petroleum hydrocarbons (TPH-G) are present in 5 of <br /> ' the 12 monitoring wells (MW-1, MW-2, MW-4, MW-5 & MW-202) MTBE was not found <br /> to be present in the monitoring wells Three domestic water wells in the immediate area of <br /> the tanks were tested and found to be non-detect for all analytes <br /> The test results from the December 1999 monitoring show that aromatic hydrocarbon <br /> compounds (BTEX) and gasoline range petroleum hydrocarbons (TPH-G) are present in 4 of <br /> the 12 monitoring wells (MW-1, MW-2, MW-4, MW-5) MTBE was not tested for Three <br />