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January 11, 1992 Working To Restore Nature <br />• ARCO Station No. 548, Stockton, California <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The ground-water flow direction has consistently been southeast since October 1991. Low <br /> concentrations of hydrocarbons were detected in ground-water samples collected from <br /> monitoring well MW-1. Dissolved hydrocarbons were not detected in monitoring wells MW- <br /> 2. MW-3, and MW-4. <br /> We understand that Emcon will conduct the next quarterly monitoring event in December <br />• 1992. We recommend signed copies of this report be forwarded to Mr. Steve Schneider, San <br /> Joaquin Public Health Services, Environmental Health Division, P.O. Box 2009, Stockton, <br /> California 95201 and Ms. Elizabeth Thayer, California Regional Water Quality Control <br /> Board, Central Valley Region, 3443 Routier Road, Sacramento, California 95827. <br /> Please call if you have questions regarding this report or any aspect of the project. <br /> i' <br /> Sincerely, <br /> RESNA Industries <br /> i•I, ' <br /> /regggW. ltimari <br /> Proj eologis <br /> t Ja nson <br /> oject Geologist <br /> /4" a. <br /> t Richard H. Walls <br /> P.E. 43139 <br /> Attachments: Plate 1, Site Vicinity Map <br /> Plate 2, Generalized Site Plan <br /> Plate 3, Potentiometric Map <br /> Table 1, Ground-Water Monitoring Data <br /> Appendix: Emcon Associates: Field Notes, Chain of Custody Record, and Laboratory <br /> Analysis Reports <br /> I030ccar <br /> 30004-6 3 <br />