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09 August 1999 AGE-NC Project No. 98-0466 r- Page 6 of 10 _ pit and in the dispenser-area excavation to collect soil wid ground water samples to assess for.the presence of petroleum hydrocarbons'in soil and grouno water to depths below 45 feet bsg. AGE . prepared a work plan dated 20 May 1999 and titled Site';4ssessment Work Plan-Former USTNa. 1, which was approved by the PHS-EHD-on 03 June 1999. 3.0. PROCEDURES To meet the PHS-EHD requirements for closure consideration, AGE advanced three soil borings to 50 feet bsg (and one soil boring to 20 feet bsg that,was abandoned due to hole problems), collected k soil and ground water samples from-the borings, procure laboratory analysis for TPH-d and.BTEX in the,groundwater and selected soil samples, and prepared this report of findings. The field'investigation was conducted in accordance-with PHS-EHD and CVRWQCB,guidelines for,the investigation of UST sites and in accordance with the PH S-EHD-approved work plan prepared by AGE. r Field work was conducted on 22 June and 24 June 1.999; the fieldwork was conducted under the . observation of the PHS-EHD; deviations from the work )]an were made with the concurrence of the PHS-EHD representative, with the.exception of a sampl,ing error that was discussed and remedied ' with PHS-EHD concurrence, as discussed in Section 32. below. r 3:1. SOIL SAMPLING AND ANALYSIS t Soil samples were, collected utilizing a.van-mounted eoprobe 5400 soil probing machine. The geoprobe utilized direct push technology to advance a s it or ground water sampling attachment to the desired sampling depth..Four probe borings were ad anced on the site: P I and P2 in the former - UST pit.area, and P3 and P4 in the former(dispenser/pi oduct piping) excavation area. Soil boring P1 was advanced in the former UST pit, but pea-gravel collapsed back into'the probe boring each time the sampler was withdrawn. At 20 feet bsg,the hole was abandoned,with PHS-EHD approval, and was reestablished approximately 5 feet from P1 just butside the former UST pit. Pea-gravel was still encountered in probe boring P2,but the volume appeared to-be reduced and hole problems were manageable. Soil samples were collected at 5-foot,intervals in.boti gs P1 and P2, at 10-foot intervals for the upper 40 feef of-P3 in the former excavation area, and at 5-foot intervals from 40 feet bsg to,50 feet bsg. Soil samples were notcollected from probe boring P4.- Soil 4:Soil samples were collected-utilizing 1.25-inch'diam ter probe rods and all attached 2.15-inch 7 diameter soil sampler..The soil sampler was loaded with four.6-inch brass sleeves to receive the Advanced GcoEnvironmental,Inc.