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q \ <br /> August 16, 1991 <br /> San Joaquin County Public Health Services AUG 2 0 1991 <br /> Environmental Health Services <br /> P.O. Box 2009 L.':dIRONMENTAL HEALTH <br /> Stockton, CA 95201 PE!:',":;T..1SERVICES <br /> SUBJECT: Site Mitigation Plan <br /> Cal West Concrete Cutting I r <br /> 1153 Vanderbilt Circle <br /> Manteca, CA \ "� <br /> Dear Staffperson: <br /> The following work plan presenia a reasonable process to mitigate soil <br /> contamination caused by petroleum hydrocarbons at Cal West Concrete, 1153 <br /> Vanderbilt Circle, Manteca, California. <br /> BACKGROUND: On March 7, 1991 , two underground storage tanks were removed <br /> from the subject property under permit of San Joaquin County Public Health <br /> Services/Environmental Health Division and Manteca Fire Department. Tank <br /> #1 (Figure 1 ) formally contained gasoline motor fuel, eft leaded and <br /> unleaded- Tank #2 (Figure 1 ) formally contained di :i tor-. fus3; The <br /> tanks were degassed, and subsequently shipped and disposed of by Erickson <br /> Inc. , of Richmond California. At the time of removal, there appeared to <br /> be no visible breaches of the tanks by puncture or corrosion. <br /> Soil Tech Engineering, 298 Brokaw Road, Santa Clara, California 95050, <br /> collected four soil samples at approximately 3 feet below the former tank <br /> bottom area. The samples were labeled 1, 2, 3, and 4. (Location 1-W-12, <br /> 1-E-12, 2-W-12, and 2-E-12, respectively. ) (Figure 1 ) <br /> The samples were conducted by hand sampler and collected in brass tubes. <br /> The ends were covered with aluminum foil , plastic caps and sealed, labeled, <br /> and placed on blue ice for transport to a state certified analytical <br /> laboratory under chain of custody. (Attached) <br /> LABORATORY ANALYSIS: The soil samples (1 and 2) were analyzed for Total <br /> Petroleum Hydrocarbons as gasoline (TDHg), Benzene, Toluene, Ethel benzen, <br /> Xylene (BTEX) and EPA Methods 7420/7421 and 8240. <br /> Soil samples 3 and 4 were analyzed for Total Petroleum Hydrocarbons as diesel <br /> and Benzene, Toluene, ethyl benzene and Xylene (BTEX). <br /> The results of analysis of the soil samples are shown in Table 1. The <br /> locations of the soil samples taken from the excavation are shown on the <br /> site plan (Figure 1 ). The laboratory testing results by Anametrix Inc. , <br /> are attached. , <br /> lv, r <br />