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4010gicat Tech ics I= <br /> 1101 7h street <br /> Modesto,California 95354 <br /> 1 (209)522-41191 Fax(209)522-4227 <br /> ' REPORT <br /> ' Groundwater Monitoring <br /> 2°d Quarter 2004 <br />' Morita Brothers <br /> 814 E. Charter Way <br />' Stockton, CA <br /> Project No 724 2 <br />' August 27, 2004 <br /> EXECUTIVE SUMMARY <br />' This report summarizes the 2nd Quarter 2004 round of groundwater monitoring and testing <br /> that occurred on April 29, 2004 The laboratory analyses indicate that five of the nineteen <br /> monitoring wells on this site remain impacted by gasoline range petroleum hydrocarbons <br />' The groundwater contamination plume appears to have migrated off site This can be seen in <br /> Figures 5 and 7 <br /> The average elevation of groundwater in the water table wells at the site was —2169 feet <br /> MSL (below mean sea level) or approximately 37 feet below grade surface (Table 1) This <br /> project's historic low groundwater levels in the early 1990's were 20 feet lower than the <br />' current level This is part of the problem with trapped residual hydrocarbons below <br /> groundwater that act as a continuing source of groundwater contanunation <br />' Groundwater gradient calculations demonstrate that groundwater flow in the three-aquifer <br /> horizons investigated, water table, intermediate and deep wells, flowed in an easterly <br />' direction The historical groundwater gradients at this site consistently trend to the east The <br /> vertical flow component of shallow groundwater gradient were nixed for this quarter Well <br /> pair MW-41104 exhibited a downward flow that is consistent with past events <br /> The data from the wells that were installed at the site in December 2003 continues to indicate <br /> that the plume appears to extend to the east of the site It is not known whether or not <br /> 1 <br /> 1 <br />