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PRE-TANK REPLACEMENT Site Assessment Results <br /> 1 420 WEST KETTLEHAN LANE,LO01, {A. <br /> Aegis Project No. 89-013 <br /> Page 9 <br /> 4.3 PETROLEUM HYDROCARBONS IN SOIL: 'WESTERN FUEL ISLAND <br /> Gasoline odor observations, PID readings and soil sample analytical <br /> lab data do not indicate marked impact to the subsurface near the <br /> western fuel island (figure 2, Appendix B, Tables 1&2) . <br /> 5.0 CONCLUSIONS <br /> Aegis offers the following conclusions regarding petroleum <br /> hydrocarbons in the existing tank basin and proposed new tank <br /> location: <br /> 1) There, appears to be minimal impact to native soils adjacent <br /> to the existing tank basin: <br /> 2) Backfill soils in the existing tank basin may contain <br /> petroleum hydrocarbons. There are between 300 and 400 cubic <br /> yards of backfill soil in the tank basin. A permit from the <br /> San Joaquin County Health District (SJCHD) is required to <br /> remove more than twofeet from the bottom of an excavation <br /> E from which underground storage tanks have been removed, <br /> 3) Soils from the northwestern corner of the proposed new tank <br /> location contain petroleum hydrocarbons. <br /> ; - 4) Preliminarily, native soils are probably suitable for in- <br /> situ treatment technclogies, such as Vapor. extraction. <br /> Lj5) On-site thin-spreading .anu` aeration of soils containing <br /> petroleum hydrocarbons requires a permit from the San <br /> Joaquin County Air PoII74tion Control District (SJCAPCD) and <br /> approval from SJCHD. Typically there are- likilts to the E <br /> -1 amount of.soil that can,be aerated at given time. <br /> 6) There appears to be minimal impact to native soils adjacent <br /> j . <br /> to the western fuel island. <br /> j 7) A contingency should be developedto manage a maximum 500 <br /> cubic yards of soil generated during the tank closure, which <br /> i maycontain petroleum hydrocarbons (including trench lines, <br /> tank. backfill, etc) <br /> E <br /> ----- ------- <br /> k <br /> N <br />