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0069&dt TCChAICS tAC- <br /> 1 1 101 7"Street <br /> Modesto California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> REPORT <br /> ' Groundwater Monitoring <br /> 3rd Quarter 2002 <br /> George's Service <br /> 1600 Durham Ferry Road <br /> Tracy, California <br /> Project No 425 2 <br /> ' December 5, 2002 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 3' Quarter 2002 groundwater monitoring and testing event that <br /> was completed on September 11, 2002 The water table gradient for September I I" was <br /> 0 0013 ft/ft flowing N17°E Depth to groundwater at the site ranged between 11 9 and 12 9 <br /> feet below ground surface (bgs) for the event The groundwater gradient in the site's <br /> intermediate wells was 0 0023 ft/ft flowing N750E These data are consistent with past <br /> events <br /> The analytical results from the September 11, 2002, 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 domestic <br /> water wells in the immediate area of the former tanks were tested and none of the wells <br /> ' contained contaminant concentrations above the laboratory detection limits <br /> A summary of groundwater analytical findings includes <br /> ® TPH-G contaminant concentrations exhibited a decreasing trend in well MW-2 since <br /> the June 2001 event(four events), but increased slightly during this event <br /> ® TPH-G concentrations in MW-1 increased slightly over last quarter, however, <br /> benzene decreased slightly <br />