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1 <br /> GedCo icat rechiics Inc. <br /> i 10 7111 street <br /> Modesto Calilomia 95354 <br /> (209)522-4119/fax(209)522-4227 <br /> ~ REPORT w <br /> 1 Groundwater Monitoring <br /> ]Sl Quarter 2002 <br /> ' George's Service <br /> 1600 Durham Ferry Road <br />}� Tracy, California <br /> Project No 425 2 <br /> May 20, 2002 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the I" Quarter 2002 groundwater monitoring and testing event that <br /> was completed on February 22, 2002 The water table gradient for February 22, 2002, was <br /> 0 0011 ft/ft flowing N6 11E Depth to groundwater at the site was approximately 12 feet <br /> below ground surface (bgs) for the event The groundwater gradient in the site's <br /> intermediate wells was 0 0016 ft/ft flowing N871E These data are consistent with past <br /> ' events <br /> The analytical results from the February 22, 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 tanks were tested and none of the wells contained <br /> ' contaminant concentrations above the laboratory detection limits <br /> A summary of groundwater analytical findings includes <br /> • TPH-G contaminant concentrations exhibit a decreasing trend in well MW-2 since <br /> the June 2001 event (three events) The impacted soils in the vicinity of the farmer <br /> USTs were excavated in July 2001 The decrease is probably the result of the <br /> ' reduction of available mass to leach to groundwater after the excavation project in <br /> July 2001 Additional monitoring is required to determine contaminant trends <br />