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� XNA <br /> June 3, 1993 Working To Restore Nature <br /> ARCO Service Station No 2130, Stockton, California <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Hydrocarbon concentrations continue to fluctuate in ground water collected from six of the <br /> monitoring wells The ground-water flow direction was flowing towards the east-southeast <br /> which is consistent with past data <br /> In our opinion, continued quarterly monitoring is warranted We understand that Emcon <br /> will conduct the next quarterly monitoring event in July 1993 We recommend that copies <br /> of this report be forwarded to Mr. Michael Infurna of the San Joaquin Public Health <br /> Services, P O Box 2009, Stockton, California 95201 and Mr James Mangham of the Central <br />" Valley Regional Water Quality Control Board, 3443 Routier Road, Sacramento, California <br /> 95827-3098 <br /> Please call if you have questions regarding this report or any aspect of the protect <br />" Sincerely, <br /> RESN Industrie <br /> f ay Jo son <br /> Protect Manager <br /> Richard H Walls <br /> P E 43139 <br /> Attachments Plate 1, Site Vicinity Map <br /> Plate 2, Generalized Site Plan <br /> Plate 3, Potentiometric Surface Map <br /> Table 1, Results of Subjective Analyses and Ground-Water Elevations <br /> Table 2, Results of Chemical Analyses of Ground-Water Samples <br /> Appendix Emcon Associates Field Notes, Chain of Custody Record, and <br /> Laboratory Analysis Reports <br /> 0429kchr <br /> 30003-9 3 <br /> 1 <br />