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Ms. Hinson and Mr. Sasson August 23, 1995 Page 2 pipeline area soil are not likely to pose an unacceptable health risk.' Nevertheless, based on discussions with your office, Universal-Rundle Corporation has elected to excavate the soil in the vicinity of boring CE-3 and dispose of if at Forward Landfill. This plan was discussed with Steve Sasson on August 2 and 3, 1995 and found to be acceptable. PROPOSED SCOPE OF WORK Before beginning any field activities, USA Underground Service Alert will be notified of our intent to excavate. The area of the proposed excavation was cleared by an underground utilities locating service prior to drilling in July 1995. Figure 3 shows the approximate area of proposed excavation. SEMCO will be contracted by Universal-Rundle to excavate and haul the soil; Cypress Environmental will perform soil sampling. It is anticipated that the excavation will be about 10 feet wide by 10 feet long by 8 feet deep and will extend north of CE-3 to the asphalt pavement and south into the former Tank 1 backfill. The dimensions of the excavation may vary depending on field conditions.' Given the anticipated excavation dimensions and assuming a soil expansion factor of 1.3, approximately 40 to 50 cubic yards of soil will be removed from the excavation. The soil will be placed directly into a truck and hauled to Forward Landfill, where it will be stored in a temporary stockpile prior to disposal based on the results of base and sidewall soil sampling. After excavation is complete, Cypress Environmental will collect soil samples for chemical analysis from the base and four sidewalls of the excavation. Each soil sample will be collected by driving a 2-inch-diameter by 6-inch-long brass or stainless steel tube into the soil brought to the surface by the backhoe operator. The sample tubes will be capped, labeled, sealed in plastic bags, placed in a cooler with blue ice, and taken under chain-of-custody to a State-accredited laboratory for analysis of VOCs, including acetone, by EPA Method 8240. After analytical results are received which indicate that acetone and related VOCs are not detected at the base or in the sidewalls of the excavation, SEMCO will backfill the excavation with clean, imported fill which will be compacted and brought to grade. ' The reported concentrations of acetone, benzene, and 2-butanone are (i) 14,285, (ii) 82, and (iii) 348,000 times lower than their respective PRGs for residential sites. ' Soil brought to the ground surface will be field screened for the presence of VOCs using a photo-ionization detector(PID) or flame-ionization detector (FID). The PID or FID readings will be used to adjust or modify the excavation activities, as appropriate.