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AFIRM" <br /> November $, 1993 O�� <br /> Working to Restore Nature <br /> ARCO Station No. 548, Stockton, California <br /> in the sample from well MW-1. Concentrations of benzene and TPI-Ig are shown on Plate <br /> 2. <br /> WORK IN PROGRESS <br />• <br /> ARCO has authorized preparation of a work plan for installation of one vapor extraction <br /> well in the area where the unauthorized leak occurred and one offsite groundwater <br /> monitoring well hydraulically downgradient of monitoring well MW-5. The vapor extraction <br /> well will be incorporated into the vapor extraction system which will be installed at the site. <br />• ARCO will continue quarterly monitoring. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Dissolved gasoline hydrocarbons were detected in groundwater samples collected from <br />• monitoring wells MW-1 and MW-5. Well MW-1 did not contain TOG at concentrations <br /> above laboratory detection limits. RESNA recommends continued quarterly monitoring. <br /> We understand that EMCON will conduct the next quarterly monitoring event in December, <br /> 1993. <br /> . We recommend that copies of this report be forwarded to Ms. Mary Meays of the San <br />• Joaquin Public Health Services, P.O. Box 2009, Stockton, California 95201 and Ms. <br /> Elizabeth Thayer of the California Regional Water Quality Control Board, Central Valley <br /> Region, 3443 Routier Road, Sacramento, California 95827-3098. <br />• <br />• <br /> r <br /> r <br /> i1001ccar <br /> 3OW4-a 3 <br />