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C7Q0`ogic t nChnicS `nc' <br /> 1 101 7`h Street <br /> Modesto,California 95354 <br /> ' (209)522-4119/Fax(209)522-4227 <br /> ' REPORT <br /> Groundwater Monitoring <br /> 3"d Quarter 2002 <br /> Morita Brothers <br /> 814 E. Charter Way <br /> Stockton, CA <br /> Project No 724 2 <br /> January 17, 2003 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 3rd Quarter 2002 round of groundwater monitoring and testing <br /> that occurred on September 12, 2002 The laboratory analyses indicate that six of the ten <br /> monitoring wells on this site remain impacted by gasoline range petroleum hydrocarbons <br /> The groundwater contamination plume appears to have migrated off site as evident from <br /> detection in well MW-106 The contamination is present In well MW-106 at a depth of <br /> appioximately 20 feet below the water table <br /> ' The average groundwater elevation in the water table wells at the site was —20 77 feet mean <br /> sea level (msl) and this corresponds to approximately 36 feet below grade surface (bgs) <br />' Project historic low groundwater levels in the early 1990's were 20 feet lower than the <br /> current level This 1s part of the problem with trapped residual hydrocarbons below <br /> groundwater that act as a continuing source of groundwater contamination <br />' Groundwater gradient calculations demonstrate thatg roundwater flow was S40°E at 0 0063 <br />' ft/ft for the September 12, 2002 event The rose diagram in Figure 4 shows that the <br /> groundwater gradient at this site is consistently toward the east <br /> The 4" quarter monitoring event was performed on December 20, 2002 and the report of <br /> that work will be submitted ;n early February 2003 This report is late 1n submittal for <br /> which we apologize <br />