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• DRAFT • <br /> removal depth of the obvious petroleum impacted soil as illustrated on Plate 4. <br /> Therefore, Kleinfelder proposes excavation sidewall soil sampling depth within Area B <br /> to average approximately 2 '/2 feet bgs and the average sidewall sample depth of 4 1/2 <br /> feet bgs in Area C. The average sidewall soil sample depth in area D is proposed at <br /> approximately 6 1/2 feet bgs. <br /> Previous soil sampling locations and analytical results from Kleinfelder's pushprobe <br /> assessment will be used to evaluate actual confirmation soil sampling locations and <br /> depths. A Photo-ionization detector (PID) will be used during excavation activities as a <br /> screening tool to assess the potential limits of petroleum impacted soil. The potential <br /> and actual confirmation soil sampling location will be field screened using the PID and <br /> recorded for reporting purposes as described in Appendix B, Section B-2.2. <br /> The soil samples from within the excavation will be collected from the bucket of an <br /> excavator or by using a stainless steel core barrel attached to extension rods and a <br /> slide hammer. The stainless steel tubes will be removed from the soil and the ends <br /> sealed with Teflon tape and tightly fitting plastic caps. The samples will be placed <br /> immediately into an iced cooler. The samples obtained will be transported under chain- <br /> of-custody control to Kleinfelder's office and then transported by courier in a chilled ice <br /> chest to a State-certified analytical laboratory for the requested chemical analyses. <br /> The stainless steel hand auger and sampling equipment and tubes will be cleaned <br /> between sample locations with a Liquinox® (laboratory-grade detergent) and potable <br /> water wash and a distilled water rinse. New stainless steel tubes used for sample <br /> collection will also be decontaminated using the same methodology. <br /> Based upon preliminary verbal conversation between RAH Environmental of Loomis, <br /> California (RAH), a hazardous materials excavation and disposal subcontractor, it is <br /> Kleinfelder's understanding that Forward Landfill or Altamont Landfill (local Class II <br /> Landfills) will accept the proposed excavated material based on the analytical data <br /> contained in Kleinfelder's previous pushprobe soil and groundwater assessment and <br /> will not require additional stockpiling or chemical analyses. Based on this preliminary <br /> information, this workplan does not include stockpiling of excavated soil onsite, <br /> stockpile soil sampling or chemical analyses for disposal purposes. At this time, <br /> Kleinfelder proposes that the material be excavated directly into transportation trucks <br /> and hauled directly to a local landfill. This aspect of the workplan, if realized, will <br /> contribute to a significant cost savings since the excavated soil will not have to be <br /> handled several times and will also save money in terms of soil collection and testing. <br /> The time for the removal process should also be much shorter by directly loading the <br /> material into the transportation trucks. <br /> Please note that additional excavation activities and soil sample collection and analyses <br /> may be necessary based on the requests of EHD and/or based on confirmation soil <br /> sampling results which are above acceptable health risk/agency cleanup goal/s. <br /> 44843.T04/STO5R997/DH:Iv Page 6 of 14 <br /> ©2005 Kleinfelder, Inc. August 16,2005 <br />