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Clati ton Copies of these permits are provided in -%ppcndLx A 40 HEALTH AND SAEEIY ELMNINQ According to the laboratory analysis of soil samples coli---Lted from the subject si.e during installation of the monitoring Aellti, the possible contaminants to be encountered during the soil excavation Acre petroleum hydrocarbons as gasoline, toluene, ethylbenzene, xylenes, and oil and grease BenLene was not detected in any of the samples. In addition to the chemical hazards posed by the presence of these chemicals, some physical hazards related to deep excavations and soil aeration were consideree/ To account for ,hese chemical and physical hazards, Clayton developed a health and safety plan This plan was provided to the contractor and workers onsite der ing a health and safety briefing conducted prior to rommencement of work onsite. A copy of this plan is provided in Appendix B. 5.0 SQ1L EXCAYADON AND AERATION Soil excavation started on July 23, 1990, near to-- g, soline island concrete pad, which was still in place Fuel Oil Polishing Company excavated the soil using a Case excavator, a 12-yard dump truck, and a Case 450 truck loader. Clayton monitored excavated soils with an organic vapor meter (OVM) to detect hydrocarbons. On July 26, 1990, after about 1,000 cubic yards of soil were excavated, Clayton collected five soil samples from the walls of the excavation Analysis of these samples revealed further gasoline and oil and grease contamination near the north and east walls of the excavation Excavation continued on the north and east sides of the excavation A total of about 1,650 cubic yards of soil were excavated to achieve removal of all soils with concentrations exceeding 10 mg/kg of gasoline and 100 mg/kg of oil and grease Aeration of the excavated soils involved spreading the soils in thin layers (approximately 1 foot High) onto a polymeric liner. This liner was used to prevent the contaminants in the excavated soil from mixing with surface soil. ne aerating soils were periodically turned over 5.1 EXCAVATION PIT SAMPLING A total of 13 soil samples were collected from the excavation pit Ten samples were crilected from the walls of the initial excavation to confirm that all contaminated soils had been excavated All samples were collected in 2-inch diameter brass tubes, covered with aluminum foil, capped, and sealed with tape to prevent volatile hydrocarbon escape, These samples were placed on dry ice and transported to Clayton's state-certified laboratory for analysis The 10 samples collected from the walls of the excavation were analyzed by the iollowing methods: C EPA Method 5030/8015-8020, for TPH as gasoline and for BTEX -3- :ys}]filli,4.F