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Ms. Margaret Lagorio Project 797613 August 30, 1999 Page 3 remain in place, Pinnacle will direct the subcontractor to overexcavate until field screening data (using a photoionization detector [PID1) of soil samples collected from the base and sidewalls of the excavated area indicate soil containing relatively high concentrations of hydrocarbons have been removed. Overexcavation of soil will be limited to two feet laterally and six feet vertically in the product line areas and will not extend deeper than a total depth of approximately 17 feet in the UST area. The excavated soil is proposed to be stockpiled at the location shown on the site plan in Appendix A. • The anticipated length of areas to be overexcavated for product line removal and replacement will be approximately 100 to 120 feet. The actual length along the piping trenches may vary based upon observed impacts and results of field screening. • The anticipated volume of material to be removed from beneath the piping trenches is approximately 60 cubic yards. This volume is typical for recent piping and dispenser replacement activities at other ARCO facilities. • The excavated soil will be characterized for disposal and the analytical results will be evaluated to determine the appropriate, ARCO-approved, disposal facility. In the event that TPHG are less than 100 parts per million (ppm), the disposal facility may be either Redwood Landfill or BFI Vasco Road Landfill. In the event that TPHG concentrations exceed 100 ppm the soil will be transported to TPS located in Richmond, CA. Dillard Trucking, of Byron California, the ARCO transportation contractor, will submit profiling and disposal applications to the appropriate facility and transport the soil for proper disposal. • The anticipated volume of material to be removed from beneath the UST is estimated to range from approximately 300 to 800 cubic yards. This volume is typical for recent UST replacement activities at other ARCO facilities. The excavated soil from the UST location will be stored onsite and characterized for either proper disposal or, pending County approval, reuse as backfill material. • A site plan showing the piping layout and proposed locations for soil stockpile and other pertinent site features is located in Appendix A. Reporting Pinnacle will prepare a report summarizing the product delivery line, dispenser and UST removal and replacement activities, including verification soil sampling results. Copies of the certified analytical reports will be appended. CPIE:\ARCO\6080\REPORTS\608OP101,DOC-951sg:1 pilin�