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tri/valley <br /> growers <br /> Page 2 <br /> California Laboratories <br /> 1430 Carpenter Lane <br /> Modesto,CA <br /> (209)-527-4050 <br /> Authorization to release technical data is attached to this letter. <br /> 6,M-e-th.9d of dis2omlof resid—nal-Mg—erials <br /> The oil tank has been cleaned and contains no residual material. The residual <br /> gasoline will be pumped out and reused if possible. If this is not possible, the <br /> residual will be disposed in a manner to conform to regulations set forth for the <br /> disposal of this type of material. <br /> 7.Tank Pp,ry ing. <br /> The 116 oil tank has been cleaned enough to preclude any flammable vapors <br /> from emanating from the tank. <br /> Dry Ice(002)will introduced into the 1,000 gallon gasoline tank to prevent <br /> flammable vapors from escaping. <br /> S.Method of Disposal <br /> The 22,000 gallon oil tank will be filled in place with a cement slurry and <br /> capped with cement. <br /> The 1,000 gallon oil tank will be removed,cut up and sold as scrap metal by <br /> Stockton Service Station Equipment. <br /> We are also including the results of the analysis that were taken from Beta and <br /> Associates. The temporary monitoring well (drill hole 1) was constructed using two <br /> inch diameter PVC monitoring casing, the lower fifteen feet was slotted. Soil samples <br /> were taken at five foot depth intervals to a depth of twenty feet and at ten foot intervals <br /> to the base of the boring at 55 feet.The Well was pumped until discharge water became <br /> relatively clear of fine sediment and electrical conductivity readings stabilized. Five <br /> further well volumes were extracted prior to obtaining a sample. <br /> A twelve inch diameter core was cut through the concrete near the 22,000 <br /> gallon 86 oil tank to expose the underlying soil for sampling (drill hole 3). A soil <br /> boring was made to a depth of 17.5 feet. Soil types were logged almost continuously at <br /> this boring. <br /> Shallow soil samples from these borings were tested for gasoline and oil, <br /> respectively,using a flame ionization technique (FID). Shallow soil samples from drill <br /> holes 1 and 3, plus groundwater samples were tested for volatile organics using EPA <br /> method number 624.(see attachments) <br /> P. 0. Box 7114, 1255 Battery St., San Francisco, CA 94120-7114 Phone: (415) 445-1600 Telex: 03-4756 Cable: Trivalley <br />