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around the former and existing tank pit, pump islands and <br />used oil UST will be visually inspected for evidence of <br />hydrocarbon impact. Confirmation soil samples will be <br />collected in compliance with San Joaquin County guidelines <br />at the excavation limits. Analytical results from all <br />excavations will be used to determine weather to continue <br />overexcavation and to document soil remediation activities <br />and effectiveness. <br />Work will be performed under the guidelines of the Health <br />and Safety Plan (Appendix A), and supplemental Health and <br />Safety Plans prepared by the general contractor. <br />Excavation activities will continue until one of the <br />following conditions are met: <br />* Excavation is jeopardizing nearby utilities or structures <br />* The lateral and vertical extent of hydrocarbons in soil is <br />defined <br />* Groundwater is encountered <br />* Gross vertical and laterial impact is discovered, then a <br />second option may be evaluated <br />Once excavation activities are completed, soil samples will <br />be collected along the excavation sidewalls and bottom <br />within a 20 foot by 20 foot grid and/or where residual <br />hydrocarbon impact may still be suspected. Soil samples <br />collected from the excavation will be collected from the <br />excavator bucket by removing the top few inches of soil and <br />pushing a clean, 6 -inch -long, 2--inch-diameter, brass tube <br />into the soil until completely full. The ends of the sample <br />tubes will be covered with teflon tape and sealed with <br />plastic end caps. The samples will be labeled, placed in a <br />cooler with ice, entered on a Chain -of -Custody form and <br />transported to a State -certified laboratory. <br />3.2 Soil Disposition/Remediation Backfill and Compaction <br />Soil generated during excavation will be stockpiled on <br />visquene onsite, and covered with visquene. Soil, from non - <br />source areas, will be used to berm the sides of the <br />stockpile, and visquene will be arranged to minimize any <br />run-off. The stockpile cover and berms will be designed to <br />protect susceptible storm drains, if inclement weather <br />interrupts field activities. <br />Chevron proposes re -use of soil depending upon the type of <br />contaminant found. Soil will be segregated during excavation <br />based on visual inspection and from waste oil/hoist areas <br />2 <br />