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March 24, 1997 <br /> Page 6 <br /> 1 <br /> Summary of Findings <br /> Petroleum hydrocarbons were detected in the southeast comer of the <br /> former UST complex at concentrations up to 4,000 ppm TPH-g <br /> Concentrations remaining after over-excavation ranged from <br /> nondetect in perimeter samples to 2,300 ppm TPH-g in Sample T-8 at <br /> 23 feet bgs Benzene was nondetectable in all of the samples <br /> collected The TPH-g impacted area is defined horizontally to <br /> nondetect <br /> • Material removed and stockpiled during the excavation of the former <br /> gasoline UST pit consisted of approximately 380 cubic yards of <br /> impacted soil and approximately 200 yards of concrete debris <br /> No petroleum hydrocarbons were detected in the soil samples <br /> collected from beneath the former waste oil storage tank and former <br /> product lines <br /> • As approved by SJCEHD, material excavated from the waste oil tank <br /> pit was reused as backfill in the waste oil tank excavation Excavated <br /> debris and soil from the former gasoline UST pit was disposed of <br /> offsite <br /> • • No new utilities were placed in the original excavations and the site <br /> has been backfilled and graded <br /> PROPOSED SCOPE OF WORK <br /> The scope of work for subsequent investigation has been proposed to evaluate the <br /> vertical extent of gasoline hydrocarbons in soil within the area where the highest <br /> concentrations of gasoline hydrocarbons in soil were discovered during recent <br /> excavation activities This will be accomplished by drilling one soil boring (B-7) in the <br /> area of Sample T-8 This revised workscope amends PACIFIC's previously submitted <br /> workscope outlined in the Corrective Action Plan, dated August 27, 1996 <br /> As required by the Occupational Health and Safety Administration(OSHA) Standard <br /> "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR <br /> 1910 120), and by California Occupational Health and Safety Administration <br /> (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR <br /> Title 8, Section 5192), PACIFIC will prepare a Site-Specific Health and Safety Plan <br /> prior to the commencement of fieldwork The Site-Specific Health and Safety Plan will <br /> be reviewed by the field staff and contractors before beginning field operations at the <br /> site <br /> Applicable permits will be obtained from SJCE1-ID prior to drilling <br /> . The specific scope of work is discussed below <br /> 9200391 APA[i PUL l DOC <br />