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June 16, 1992 <br /> ARCO Station No. 548, Stockton, California <br />• CONCLUSIONS AND RECOMMENDATIONS <br /> The ground-water flow direction has consistently been south of east since October 1991. <br /> Hydrocarbons were detected in groundwater samples collected from the most downgradient <br /> monitoring well MW-1. No dissolved hydrocarbons were detected in monitoring wells MW- <br /> 2 through MW-4. <br /> We understand that Emcon will conduct the next quarterly monitoring event in June 1992. <br /> 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.Please call <br /> if you have questions regarding this report or any aspect of the project. <br /> Sincerely, <br /> RES lndustr' <br /> I <br /> Ja . J nson. <br />• Project Geologist <br /> Richard H. Walls <br /> P.E. 43139 <br />• <br /> Attachments: Plate 1, Site Vicinity Map <br /> Plate 2, Generalized Site Plan <br /> Plate 3, Potentiometric Map <br />• Table 1, Ground-Water Elevations in Monitoring Wells and Results of <br /> Subjective Analyses <br /> Table 2, Results of Chemical Analyses of Ground-Water Samples <br /> Chain of Custody Records <br /> Laboratory Analysis Reports <br />• <br /> 0421ccar <br /> 30004-6 3 <br />• <br />