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i <br /> detector (PID: Thermo Environmental 580A, 10 . 0 eV, calibrated to <br /> isobutylene) . The soil was then described in accordance with the <br /> I Unified Soil Classification System. Boring logs are included in <br /> Appendix A. <br /> 3. 3 . 4 completion <br />' The boring was completed as a groundwater monitoring well by the <br /> installation of 0. 020 screen PVC liner from 20 to 5 feet. Monterey <br />' sand (#3 ) was used from 3 . 5 feet to total depth. Bentonite pellets <br /> were used from 1 . 5 to 3 . 5 feet and the well was backfilled to the <br /> surface with Portland Cement. <br />' 3 . 3. 5 Surveying <br /> On August 27 , 1993 , MW-4 was surveyed relative to MW-2 . A survey <br />' rod and level were used to measure the elevation of the top of the <br /> well casings to the nearest . 01 foot. A notch was cut into the top <br /> of the casing as a reference point for future measurements. Casing <br />' elevations are tabulated in Table 1 . <br /> TABLE 1 <br /> RELATIVE GROUNDWATER ELEVATIONS <br />' Depth to Relative <br /> Relative Groundwater Groundwater <br /> Well No. Casing Elevation <br /> Elevation 3/93 9/93 3/93 9/93 <br /> 1 <br /> MW-1 49 . 71 9 . 85 12 . 08 39.86 37 . 63 <br />' MW-2 48 . 40 8 . 48 10.70 39 . 92 37 .70 <br /> MW-3 48 . 74 8 . 66 10.86 40. 08 1 37 . 88 <br />' MW-4 46 . 94 --- 9 . 56 ---- 37 . 38 <br /> * All measurements in feet <br />' 3 . 4 Backfilling of Excavation <br /> On September 7 and 8 , 1993 , the uncontaminated stockpiles were used <br />' to partially backfill the excavation. The soil was placed into the <br /> excavation and compacted using a loader/backhoe. <br />' 3 . 5 Stockpile sampling <br /> On September 8 , 1993 , 14 samples (1 per 50 cubic yards) were <br /> collected from the contaminated stockpile. Samples were collected <br /> in clean, 2 by 3-inch brass tubes. The ends of the tubes were <br /> covered with aluminum sheets, capped and sealed with tape. The <br />' 8 <br />