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u <br /> u <br /> r.•r r <br /> Working To Restore Nature <br /> 11 be necessary to complete the excavation in two separate phases. <br /> Excavated soils will be field screened by employing a photoionization detector (PID) calibrated <br /> to an isobutylene standard, as well as olfactory and visual observations. Clean soils will be <br /> stockpiled separately from the impacted soils based on field observations (odor, discoloration, <br /> PID readings). <br /> Following excavation, it is anticipated that one verification sample will be collected for every <br /> 20 linear feet along the sidewalls of the excavation and one for every 400 square feet of the <br /> excavation floor. The exact location of samples will be determined in the field under the <br /> regulatory guidance of PHS/EHD. <br /> k- All verification samples will be collected from the backhoe bucket from at least three inches <br /> below the surface of the soil. The samples will be collected into prewashed brass liners. Each <br /> liner will be sealed with Teflon sheets and plastic caps, sealed in air-tight bags, and preserved <br /> krr on ice pending shipment to a laboratory. Soil samples will be transported under chain-of- <br /> custody to a State-certified laboratory for analysis of BTEX and TPHd. <br /> Hydrocarbon impacted soils will be treated on site by either bioremediation or incineration and, <br /> subsequent to appropriate confirmation sampling, backfilled into the open excavation upon <br /> approval from PHS/EHD. <br /> ` 6.2 Groundwater Extraction and Treatment <br /> During the excavation process, the pit will be dewatered by pumping groundwater which flows <br /> into the pit. Depending upon the volume of groundwater extracted, the degree of contamination, <br /> and the volume of free product present, extracted groundwater will be treated by granular <br /> activated carbon and discharged to the sanitary sewer, discharged directly to the sanitary sewer <br /> for treatment at the wastewater treatment plant, or transported to a licensed disposal facility. <br /> Upon completion of field activities and receipt of laboratory analyses, RESNA will summarize <br /> field methods and data collected during the remediation/excavation in a technical report to be <br /> submitted to PHS/EHD. <br /> I <br /> I <br /> i <br /> F <br /> W03651REPORTs1CAP0294.FNL 8 <br />