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1 <br /> cgob ical TechnW" s lac. <br /> 1 101 7°i Street <br /> Modesto,California 95354 <br /> (209)522-3119/Fax(209)522-4227 <br /> ' REPORT <br /> Groundwater Monitoring <br /> 4th Quarter 2002 <br /> ' George's Service <br /> 1600 Durham Ferry Road <br /> Tracy, California <br /> Project No 425 2 <br /> Apn1 18, 2003 <br /> MEXECUTIVE SUMMARY <br /> This report summarizes the 4'h Quarter 2002 groundwater monitoring and testing event that <br /> was completed on December 26, 2002 The water table gradient for this monitoring event <br /> ' was 0 0009 ft/ft flowing N05°E Depth to groundwater at the site ranged between 11 85 and <br /> 13 01 feet below ground surface (bgs) for the event The groundwater gradient to the site's <br /> Intermediate wells was 0 0037 ft/ft flowing S621E These data are consistent with past <br /> events <br /> The analytical results from the December 26, 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 (six events), increasing slightly during the September 2002 <br /> ' monitoring event <br /> C TPH-G concentrations in MW-1, MW-4 and MW-5 have shown an increasing trend <br /> over the history of the site <br />