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1 <br /> October 15, 1993 Working To Restore Nature <br /> ARCO Service Station No. 2130, Stockton, California <br /> I <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Hydrocarbon concentrations continue to fluctuate in groundwater collected from six of the <br /> monitoring wells The groundwater flow direction was flowing towards the east-southeast <br /> which is generally 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 October 1993 We recommend that <br /> copies of this report be forwarded to Mr Michael Infurna of the San Joaquin Public Health <br /> I Services, P O Box 2009, Stockton,California 95201 and Ms Elizabeth Thayer of the Central <br /> Valley Regional Water Quality Control Board, 3443 Routier Road, Sacramento, California <br /> 95827-3098 Please call if you have questions regarding this report or any aspect of the <br /> project <br /> Sincerely, <br /> _ R A In s <br /> ED Geo ff <br /> -i a R. hnson <br /> P sect Manager <br /> No 4313 � w � <br /> E1F C114%c, <br /> ohn Bailey Bobbitt <br />' R G 4313 <br /> Attachments Plate 1, Site Vicinity Map <br /> Plate 2, Generalized Site Plan <br /> Plate 3, Potentiometnc Surface Map <br /> Table 1, Results of Subjective Analyses and Groundwater Elevations <br /> Table 2, Results of Chemical Analyses of Groundwater Samples <br /> Appendix EMCON Associates Field Notes, Chain of Custody Record, and <br /> Laboratory Analysis Reports <br /> k <br /> E <br /> 0825ccar <br /> -VW3-9 3 <br /> i <br />