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which will require treatment or disposal Prior to excavation it is recommended that the ground <br /> surface be cleared of asphalt and/or concrete Approximately 3,050 square feet of asphalt and <br /> 3,500 square feet of concrete will require removal (Appendix III) <br /> Excavated soils should be field screened by employing a photoionization detector meter (PID), <br /> calibrated to a isobutylene standard Clean overburden material (approximately 640 to 800 cubic <br /> yards) should be stockpiled separately from the impacted soils based upon field observations, <br /> i e , odor, discoloration, PID readings <br /> 1 <br /> Hydrocarbon impacted soils should be covered and underlain by 6 mil plastic sheeting pending <br /> ' results of laboratory analysis for the determination of the appropriate remediation/disposal <br /> ' method It may be necessary to transport impacted soil to an off-site staging area for <br /> stockpiling. <br /> During the excavation process, excavation may proceed up to 2-3 feet below the water table <br /> ' The pit may be dewatered if appropriate by pumping groundwater which flows into the pit to <br /> portable Baker Tanks Purged groundwater would be sampled for BTEX and TPHg and stored <br /> ' on-site pending determination of appropriate remediation or disposal Disposal options include <br /> transportation to a licensed disposal facility or on-site treatment by carbon or aeration with <br /> ' subsequent disposal to the city sewer system or via irrigation <br /> ' Following excavation, it is anticipated that up to twelve venficatton samples would be collected <br /> from the excavation sidewalls, one for every 20 linear feet In addition, up to four verification <br /> ' samples would be collected from the excavation floor <br /> All verification soil samples would be collected from the backhoe bucket at least three inches <br /> below the surface of the soil The samples should be collected into prewashed brass liners <br /> ' Each liner should be sealed with Teflon sheets and plastic caps, sealed in air-tight bags, and <br /> preserved on ice pending shipment to a state-certified laboratory <br /> 1500871R-053194 FNL 9 <br />