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1 - <br /> CleologicaI Technics 11tc. <br />' 1 101 Th Street <br /> Modesto,California 95354 <br />' (209)522-4119 1 Fax(209)5224227 <br />' REPORT <br /> Groundwater Monitoring <br /> 2nd Quarter 2002 <br /> Morita Brothers <br /> 81.4 E. Charter Way <br />' Stockton, CA <br /> Project No 724 2 <br /> October 3, 2002 <br /> EXECUTIVE SUMMARY <br />' This report summarizes the 2"d Quarter 2002 round of groundwater monitoring and testing <br /> that took place on June 21, 2002 The laboratory analyses indicate that five 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 /> approximately 22 feet below the water table <br />' The average groundwater elevation in the water table wells at the site was —19 29 feet mean <br /> sea level (msl) and this corresponds to 33 94 feet below grade surface (bgs) Project historic <br />' low groundwater stands in the early 1990's were 20 feet lower than the current level This <br /> is part of the problem with trapped residual hydrocarbons below groundwater that act as a <br />' source of groundwater contamination <br /> Groundwater gradient calculations show that groundwater flow was S57°E at 0 0057 ft/ft for <br /> the event of June 21, 2002 The rose diagram in Figure 4 shows that the groundwater <br /> gradient at this site is consistently toward the east <br />