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Ceotogicat rec%tics kc. <br /> ' <br /> 110170 Street <br /> Modesto,Cahfornia 95354 <br /> (209)522-41191 Fax(209)522-4227 <br /> ' REPORT <br /> Groundwater Monitoring <br /> ' 2nd Quarter 2005 <br /> ' Morita Brothers <br /> 814 E. Charter Way <br /> Stockton, CA <br /> Project No 724 2 <br /> May 16, 2005 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 2nd Quarter 2005 round of groundwater monitoring and testing <br /> ' that occurred on April 18, 2005 The laboratory analyses indicate that six 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 /> Figure 6 <br /> The average elevation of groundwater in the water table wells at the site was —2133 feet <br /> MSL (below mean sea level, Table 1) This project's historic low groundwater levels in the <br /> early 1990's were 20 feet lower than the current level This is part of the problem with <br /> trapped residual hydrocarbons below groundwater that act as a continuing source of <br /> groundwater contamination <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, <br /> ' ranging from northeast to southeast The vertical flow component of shallow groundwater <br /> gradient was nixed for this quarter Well pairs MW-41104 and MW-7/MW-107 exhibited a <br /> downward flow that is consistent with past events, whereas MW-6/106 exhibited an upward <br /> isflow that is consistent with past events <br />