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1 KLEiNFELDER File No 20-3769-01 November 21, 1994 Kleinfelder proposes that both piles be composite sampled so that the soil may be considered for backfill material for the existing excavation, for on-site treatment, or for transportation to an off- site facility for treatment and/or disposal �A (�X The soil piles would be composite sampled by graphically dividing each pile up into 150 cubic) JA -yard-sections Each section would then be sampled from four different locations and depths The f6ur different samples within each section would then be composited roto a single soil sample for chemical analysis A total of six composite samples would be analyzed for the presence and concentration of the following 4 • TPH Purgeable by EPA Method 8015M/5030 (gasoline range) • BTEX by EPA Method 8020 • TPH Extractable by EPA Method 3550 (kerosene range) ��, l The samples will be analyzed on a normal laboratory schedule requiring approximately two weeks (ten working days) for completion Once the samples have been analyzed, the results would be evaluated for use of the soil as excavation backfill, on-site treatment, and/or off-site treatment/disposal The results of that evaluation would be summarized in a short report which would be submitted to the client and the SJCEHD upon completion That short report could be used to evaluate some disposal/remediation alternatives for the soil Task B05 -Field Screening/Confirmation Sampling During Further Excavation Currently, the excavation is still open from previous excavation activities by DSS Engineering For this reason, it appears to be most cost effective to remove additional hydrocarbon affected soils at this tune in order to speed future soil or groundwater remediation which will likely be required by the SJCEHD Therefore, West Clay Properties will contract directly with an excavation contractor to conduct further excavation in the area shown on Plate 2 The area shown is the maximum extent of excavation recommended However, the actual excavation size should be determined by field observations as to the presence or absence of hydrocarbons in the soil, and field observations regarding the safety of continued excavation until the maximum area has been excavated Continued excavation should be limited to that which is determined by the excavation contractor in the field to be safe However, under no circumstances should excavation be continued beyond the area designated in Plate 2 without additional concurrence from our office to do so ETH and JYC194 f 11 6 0$e Copyright 1994 Kleinfelder Inc Aa