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y feet long by 30 feet wide (Figur` 2 ) . it is anticipated that the area will be excavated on November- 13 , 1995 . Work will be performed under the guidelines of the Health and Safety Plan (Appendix A) , and supplemental Health and Safety Plans prepared by contractors . Once ttis excavation is of ILC- �,�J ,L n:jt�sufficient size� i new tanks, saliltp_! os- will he cellecred to assess patent'al hydrocarbon impact In the area. Two SamDln=; will be collected tr0r, aaCi: sidewall , one at 5 feet bgs, a seccnd at , 1 feet bgs ( a total of B samples ) . In addition, twe bottom samples will be collected at total depth prior to tank installation. Samples will be analyzed for total petroleum hydrocarbons (TPH) as gasoline and diesel as well as benzene, toluene, ethylbenzene, and xylene (BTEX) . Soil samples from the excavation will to collected from the excavator bucket by remcvL nr, the top few inches of soil and pusr,iog a clean, 6-inch-long, 2-inch-diameter, crass sample tub; into the `oil until ccmpletely full . he ends of by sample tubes will he covered with aluminum foil ann s al'l with plastic en& caps . Tha samples will be labeled , placed in a cooler with ice, entered on a Chair:-of-Custody form and transported to a State-certified laboratory. In the event that groundwater is encountered in sufficient quantity to sample, groundwater samples will be collected from the excavation . A bailer will be used to collect the groundwater. The bailer will be emptied into appropriate VOA vials, or other glassware, preparers with preservative by the ;_aboratcry . Samples will be labeled, placed in a voolor with ice, tenterrd on a Chain- of-Custody orn and transported tC the laboratory. To accommodate the installauion of new USTs, groundwater will need to he removed from the excavation . water- will re Pumped continuously to on-site Baker tanks fc - storage . Water will be treated with activated carbon_ to remove any dissolved hydrocarbons prior to transport to the local Po'ltiti7. 3 . 3 Soil Disposition, Backfill and Compaction Soil generated during excavation will he stcckpi ie d on visruene on- size, and covered with v1sauene. Soil, fro."', non-scarce areas, will ba used to berm rhe sides of the stockpile, and visquene uT,_ ? L be arranged to miniv ze any run--oil . This iornatlon will be designed to protect susceptible storm drains, if inclement weather_ interrupts field activitic-s . Chevron proposes re-use of some scil depending upon the levels of contamination encountered. Soil will be segregated during excavation based on visual inspection. If analytical results (discrete samples collected for every 25 cubic yards ) indicate that soil is below 10 ppm TPH--gas and 0 . 005 Dram benzene than the soil