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zi <br /> J... yw <br /> 1 <br /> KAPREALIAN ENGINEERING, INC. <br /> K Consulting Engineers <br /> 535 Main Street <br /> Martinez,Ca.84553 <br /> 1415)372-5444 _ <br /> 'KEx-P86-084SS <br /> November 12 , 1986 <br /> Mobil Oil Corporation <br /> P.O. Box 127 <br /> Richmond, CA 94807 <br /> Attention : Mr . W. Bennett <br /> Re: Additional Soil Sampling For <br /> Mobil Service Station 110-NP4 Located at <br /> Tracy Blvd. and Grantline Road <br /> Tracy, California <br /> Dear Mr. Bennett : <br /> This letter report summarizes the results of the additional <br /> soil sampling and laboratory analyses for the referenced <br /> site. The stockpile soil samples were taken at 11689 Clover <br /> Road in -Tracy , California . The additional sampling analyses <br /> were conducted to comply with the County Health Department <br /> requirements for proper disposal of contaminated soil . <br /> On October 10, 1986 the stockpiled soil at the referenced <br /> site was sampled for proper disposal . Three composite soil <br /> samples (designated as COMP. "A" , COMP. "B" and COMP. "C") <br /> were taken and analyzed for Total Hydrocarbons (THC) , <br /> Benzene , Toluene, and Xylene (BTX) concentrations . Each <br /> composite soil sample consisted of four(4) individual grab <br /> samples taken at various depths and locations and composited <br /> as one sample. The results of the soil analyses showed <br /> concentrations of THC ranging from 9.9 to 52 parts per <br /> million (ppm) which was considered to be non hazardous per <br /> San Joaquin Health District (Ms. Lori Cottula) . <br /> On October 16, 1986, per San Joaquin County Health District ' s <br /> approval , approximately 600 cubic yards of stockpiled soil <br /> were transported to a private property located at 11689 <br /> Clover Road . On October 24, 1986 permission was obtained (by <br /> giving 24 hour notice) from Air Pollution Control District <br /> (Mr . George Sanderson) to aerate the transported soil. On <br /> October 27 , 1986 the soil was spread thinly (between 6 to 12 <br /> inches) on the property to allow further degradation of <br /> hydrocarbons . <br />