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i <br /> - L - _ - <br /> • also extended vertically to approximately 10 feet in depth <br /> along the western portion of the excavation. The final <br /> excavation was approximately 24 feet at the widest location, <br /> 46 feet long and 10 feet at the deepest portion. Additional <br /> excavation bottom samples designated OXB2 , OXB3 and OXB4 <br /> were collected beneath the areas of former samples PXB7 and <br /> PXB2 as shown in Figure 4/Table E . <br /> Stockpile Sampling <br /> Soils generated during the fuel UST and piping removal <br /> activities were stockpiled and sampled. Approximately 350 <br /> cubic yards were generated from the removal and excavation <br /> of the USTs and piping. Samples designated SP-1 (a-d) through <br /> SP-3(a-d) and PSP-1 (a-d) were collected from the fuel UST <br /> and piping stockpiles . Samples designated UOSP(a&b) were <br /> collected from approximately 50 cy of soil generated from <br /> the used oil tank and hoist removals (Figure 2 ) . <br /> The stockpiles represented by samples SP-4 (a-d) through SP- <br /> 9 (a-d) were collected from the soils generated from the <br /> overexcavation activities and totaled approximately 900 <br /> cubic yards of soil (Figure 3 ) . The stockpile represented <br /> by samples SP-9 (a-d) was segragated during the excavation of <br /> the western portion of the southern most pump island. This <br /> • soil was eventually added to the used oil stockpile due to <br /> the suspected presence of heavier hydrocarbons . <br /> Stockpile samples SP-1 (a-d) through SP-9 (a-d) each <br /> representing approximately 100 cubic yards . Initially, one <br /> sample was collected for every 25 cy. Four samples were then <br /> composited in the laboratory and analyzed as one sample <br /> representing approximately 100 cy. <br /> Stockpile soil samples were collected by removing the top 12 <br /> to 16 inches of soil, pushing a clean 6 " long (2 " diameter) <br /> brass tube into the stockpile until completely filled, then <br /> removing, sealing and handling the sample tube with the same <br /> protocol as described previously. <br /> SOIL REMEDIATION <br /> The soils generated from UST/piping removal and over- <br /> excavation activities and represented by samples SP-1 (a-d) <br /> through SP-8 (a-d) were spread over the site and aerated. <br /> Aeration activities were in compliance with San Joaquin <br /> Valley Unified Air Pollution Control District ( SJVUAPCD) <br /> guidelines and permit . Aeration permit is attached in <br /> Appendix A. <br /> Soils were aerated by spreading the soils into thin 'lifts, <br /> • then mechanically turning the soil over to allow for volat.i- <br /> Page 5 <br />