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Confirmation soil samples were collected from the excavation sidewalls and bottom The samples were placed on ice, secured, and transported under chain-of-custody protocol to Argon ' Laboratories Samples were analyzed for TPH& TPHd, and BTEX None of the confirmation samples contained detectable concentrations of TPHg, TPHd, or BTEX Sample locations are shown on Figure 5 and analytical results are summarized in Table 3 4.4.2 Stockpiled Soil Remediation ' In November 1993, 12 discrete soil samples were collected from the 1,500 cubic yards of stockpiled soil The samples were collected a minimum of two feet below the surface of the soil pile into prewashed brass tubes, capped with Teflon tape and plastic end caps and transported on ice, under chain-of-custody to Argon Laboratories Samples were analyzed for TPH& TPHd, and BTEX The samples were composited into six samples and five of the samples contained no detectable concentrations of TPHg, TPHd, or BTEX Sample SP1-Ij contained ethylbenzene at concentrations of 0 15 ppb, xylenes at concentrations of 7 6 ppb, and TPHg at concentrations of 420 ppb Soil sample locations are shown on Figure 5 and analytical results are summarized in Table 3 In April 1994, RESNA personnel, using a loader, manipulated the stockpiled soil by turning and spreading to further enhance and expedite natural biodegradation processes The portion of the soil that contained TPHg at 420 ppb in November 1993, was spread out south of the stockpile to promote aeration No samples were collected at the time In September 1994, RESNA personnel collected 30 discrete soil samples, one for every 50 cubic yards of soil, in accordance with PHS/EHD correspondence dated March 24, 1994 The samples were collected a minimum of two feet below the surface of the soil pile into prewashed brass tubes, capped with Teflon tape and plastic end caps and transported on ice, under chain-of-custody, to Argon Laboratories Samples were analyzed for TPH& TPHd, and BTEX No petroleum hydrocarbons were detected in any samples Soil sample locations are shown on Figure 6 and analytical results are summarized in Table 4 In December 1994, RESNA personnel supervised backfilling and compaction activities Approximately 170 tons of sand was placed in the floor of the excavation and overlain with a fabric liner prior to placing remediated material into the excavation The imported sand and the fabric liner were planed to provide a stable base upon which to accomplish adequate compaction The remainder of the excavation was backfilled with native remediated soil 4.4.3 Groundwater Remediation In November 1993, a discrete water sample was collected from the excavation pit The sample was placed on ice and transported under chain-of-custody, to Argon Laboratories The sample was analyzed for TPH& TPHd, and BTEX The sample contained TPHg at concentrations of 3,100 ppb, w 1943381closure doc 5