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i <br /> l <br /> CHRONOLOGY <br /> LINDEN UNIFIED SCHOOL DISTRICT <br /> BUS-GARAGE <br /> 18351 EAST MAIN STREET <br /> LINDEN CA <br /> 08-19-86 A 10,000 gallon diesel tank fails a precision test. <br /> 09-03-86 The 10,000 gallon diesel tank fails a repeat precision test. <br /> 09-08-86 The 10,000 gallon diesel tank again fails a precision test. <br /> 12-05-86 A 10,000 gallon c5esel tank is inspected this date by a structural engineer and is found to <br /> be;,:structurally sound. The tank is certified structurally sound and is ready for the <br /> fiberglass lining. <br /> 10,000 Gallon Diesel Tank <br /> Piping End N <br /> 00 <br /> Fill End W + E <br /> Dispenser Island S <br /> 01-16-87 -After the 10,000+:Tion tank had been lined with fiberglass and during a precision test, the <br /> tank tester noted a leak from a union joint in the suction piping. After tightening this joint <br /> the tank passed tl-'e precision test: <br /> 12-06-89 Three angled scii baring were drilled to obtain soil samples from beneath the tank. A soil <br /> sat, pie was taken Tom approximately 25 feet below ground surface beneath the middle <br /> aneach end cfte tank. The.soil to the total depth of the borings was noted as silty <br /> clay. <br /> The middle and eastern soil samples showed nondetect for TPH as diesel and BTEX at <br /> detection limits cf 5.0 ppm and 0.005 ppm, respectively. <br /> The western scii sample showed nondetect for TPH as diesel and EX at the detection <br /> limits noted abcie, but showed 0.009 ppm and 0.021 ppm for benzene and toluene, <br /> respectively. <br /> 03-15-90 Site placed in LCP this date. <br /> 03-28-94 PHS/EHD start:mpares leaching potential analysis. Site passes. PHS/EHD calculated <br /> an estimate of"Me mass volume,remaining at the site. A conservative area of 40 feet by <br /> 40;feet by 40 fe was assumed. A bulk density value of 120 pounds per cubic foot was <br /> selected from .=blished tables for silty clay soils. The concentrations noted .in the <br /> laboratory results were used for the average hydrocarbon concentration. It was calculated <br /> that 0.069 pounds of benzene and 0.161 pounds of toluene remain in an area of 64,000 <br /> cubic feet. The highest groundwater for this site is 105 feet below ground surface. <br />