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r <br /> USA USA 6QSI]Lim CURPORAnun <br /> PETROLEUM 30101 Agoura Court, Ste. 200, Agoura Hills, CA 91301-4311 LE:NVIRCIK4 iE'1 i AL hE:A1.T I i <br /> (818)865-9200 FAX (818)865-0092 r; OMI <br /> T �ERVICE <br /> 94 NOV 14 PM 1: 30 <br /> October 28, 1994 <br /> Ms. Linda Turkatte <br /> San Joaquin County Public Health Services <br /> P.O. Box 2009 <br /> Stockton, California 95201 <br /> RE: USA Petroleum Station # 65 <br /> 2500 E. Lodi Avenue <br /> Lodi, CA <br /> Dear Ms. Turkatte: <br /> This letter is in response to your request for an Remedial Action Plan for the above referenced <br /> site. The last four quarter groundwater sampling results have shown non detect in five of the <br /> eight groundwater monitoring wells to very low level contamination in three wells (MW-8, MW- <br /> 4, & MW-2). The groundwater has fluctuated approximately six feet since 1991. Inspite of the <br /> high fluctuations in the watertable there is no significant changes in the contaminant <br /> concentrations in groundwater. Also, all soil boring samples taken show less than detectable <br /> hydrocarbon concentrations including the last boring drilled next to the tank area. These data <br /> indicate that there is no significant soil contamination in the capillary fringe or the vadose zone. <br /> However, there seems to be some residual contamination present in the MW-8 and MW-4 areas. <br /> Per your request, USA will continue to sample all the wells on a quarterly basis, so that <br /> adequate data be obtained for a remedial action plan. Pumping and treating the groundwater is <br /> not a suitable alternative, as we will be depressing the water table further more and possibly <br /> treating clean groundwater. USA is planning to conduct a one day vapor treatability test to <br /> obtain more data to prepare a remedial action plan. A vapor treatability test work plan will be <br /> submitted to you within 30 days. Please extend the deadline to submit the Remedial Action <br /> Plan. We appreciate your cooperation in this matter. <br /> If you have any questions please call me at (818) 865-9200 Ext 214. <br /> Thank You. <br /> Sincerely, <br /> Srikanth Dasappa <br /> Environmental Engineer <br />