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ARCADIS BBL Mr. Gray <br /> September 1, 2007 <br /> o Air dry <br /> After sampling is complete, all borings will be tremie grouted from the total depth to <br /> ground surface using neat cement in accordance with local county protocols. Concrete <br /> or asphalt will be applied at the surface as necessary to restore the site to prior <br /> conditions. <br /> Following the completion of field activities,each newly installed sail boring will be <br /> surveyed by a California-licensed land surveyor.Additional site features may be <br /> surveyed to accurately depict the site. <br /> Soil cuttings, decontamination fluids, and purge water generated during drilling <br /> activities will be stored on-site in labeled 55-gallon drums pending receipt of <br /> analytical data for soil and water samples and coordination of disposal at <br /> aappropriate PG&E approved facility. A drum staging area will be coordinated with <br /> the substation staff. <br /> Sample Collection and Analyses <br /> Soil samples will be collected every five feet from surface soil to the total depth of the <br /> boring for analytical testing.The soil samples will be sealed, labeled, and placed in <br /> an ice-chilled cooler.All soil samples will be submitted to Calscience Environmental <br /> Laboratories, a California Department of Public Health certified analytical laboratory, <br /> for the following analyses: <br /> o Total petroleum hydrocarbons(TPH), quantified into carbon ranges, <br /> by United States Environmental Protection Agency(USEPA) Method <br /> 8015B <br /> o California Assessment Manual(CAM-17)Metals by USEPA Method <br /> 60108 <br /> o Polychlorinated biphenyls(PCBs)by USEPA Method 8082. <br /> If groundwater is encountered, one grab groundwater sample will be collected.The <br /> grab groundwater sample will be collected by inserting clean,dedicated schedule 40 <br /> polyvinyl chloride(PVC)screen and riser into the borehole and collecting a <br /> groundwater sample through the PVC screen using a decontaminated stainless-steel <br /> bailer.The groundwater sample will be retained in laboratory-supplied containers, <br /> sealed, labeled,and placed in an ice-chilled cooler.The groundwater sample will be <br /> submitted to Calscience Environmental Laboratories for the following analyses: <br /> Page: <br /> 4/5 <br />