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FC7X ENVIRaNMENTAL SERVICES, ING. A 6015 West Cliff Orive • Knoxville, TN 37919 • (6151690-1996 7 November 30, 1985 rZ_ DD Mr. Kelly Williamson Kayo Oil Company 1221 E. Main Street Chattanooga, TN 3708 RE: Econo Station 4325 E. Washington Ave. Stockton, CA 95205 Dear :�r. Williamson- The illiamson:The following report covers several soil and groundwater assessment procedures that have been performed since the last four monitor wells were installed at the Econo gas station located at 8325 E. Washington Ave. in Stockton, CA. On September 25, 1985 a soil boring was made in the west side of the underground storage tank back fill to assess the soil contamination levels with respect to depth. Soil samples were taken every five feet from the surface, down to 41 feet, where groundwater was encountered. �- Each soil sample was field screened with a draper tube and pump and any sample that indicated a presence of hydrocarbon was sent to Twining Lab- ortories for analysis. A copy of the analysis is attached, as is the analysis of the soil samples that were taken on September 18, 19, 20, 1985 during the drilling of MW1478, MW#9, MW#10 and MWr11, On September 26, 1985, groundwater samples were collected from monitor wells MW, MW�9, M1Jn10 and M14u11 and these samples were analyzed for EPA 602, E.D.B. and lead and these results are attached. Additional groundwater samples have been ordered as of December 5, 1985, and the results of these analysis will be forwarded when they are received. An updated monitor well data sheet is attached for your review, and you will note the appearance of visible hydrocarbon contamination in MWu7 and MWn9 hhich previously was not observed. There has been a continual decrease in the groundwater table at this loca- tion from June 22, 1985 to present, lending to the premise that a permeable zone has been exposed to the product plume that exists upon the groundwater, and this plume has started to migrate, as is evidenced by the observation of visible hydrocarbon contamination in MW,Y5, MW#7 and 1114.119.