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1 <br /> r <br /> Mr Kyle Christie Project 0805-142 003 <br /> a July 28, 1995 <br /> Page 3 <br /> • EMCON conducted an additional off-site subsurface investigation on June 7, <br /> 1995, which included the installation of two vapor extraction wells (VW-12 and <br /> VW-13 [see Figure 2]) Results of this investigation will be presented in a <br /> Problem Assessment Report (PAR) currently being prepared <br /> ANTICIPATED WORK <br /> • ARCO will continue quarterly monitoring The next sampling event is tentatively <br /> scheduled for August 1995 <br /> • EMCON will prepare a PAR <br /> CONCLUSIONS <br /> TOG and benzene were below laboratory detection limits in all wells TPHG was detected in <br /> all wells TPHD was not detected in wells MW-2 and MW-3, but was detected in well MW-1 <br /> However, the laboratory indicated that the sample from well MW-1, analyzed for diesel, <br /> contained a hydrocarbon component that eluted in the diesel range The laboratory indicated <br /> that the eluding peak did not match the typical diesel fingerprint The groundwater flow <br /> direction was toward the south, which is consistent with all the previous sampling events, <br /> except for sampling conducted during the second quarter 1994 During the second quarter <br /> 1994, the groundwater flow direction was towards the northeast <br /> DOCUMENT DISTRIBUTION <br /> We recommend that copies of this report be forwarded to <br /> Linda Turkatte <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 388 <br /> Stockton, California 95201-0388 <br /> Elizabeth Thayer <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> SAC/N\PJ"80"8051420 3BL-95 PAS 3 <br />