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Pacific Gas&Electric Co.. . <br /> s <br /> Page 6 <br /> U Upon retrieval,samples retained'for chemical analysis willbe contained in the sample sleeve by means of a-plastic <br /> cap over a teflon seal oneach end'of the sample.tube.The samples will be placed into a cooler chest on"ice"under. <br /> proper chain of custody protocol for shipment to the analytical laboratory. <br /> LI <br /> The maximum depth of each soil boring will be determined by using theSeld screening device.A given soil boring <br /> will be terminated at an approximate depth of 40 feet below the.surface grade,or when three consecutive non- . <br /> detected readings(10 vertical feet) are it tained.7 Each soil boring.will be backfilled upon termination with a <br /> sand-cement grout from the bottom of the soil boring to the surface grade.. <br /> Laboratory Analyses: <br /> Soil samples will be transported to a state approved laboratoryfor chemical analyses::The'laboratory analyses will. <br /> be focused on the'detection*of compounds commonlyassociated with gasoline. The following methodologies will be <br /> specified for the chemical analyses of soil and groundwater samples: <br /> U <br /> --EPA method 8020 for BTEX <br /> Methoddetection'limit:Soil .0.005 mg/kg <br /> --EPA method 8015(modified)for total petroleum hydrocarbons as gasoline <br /> Method detection limit:$oil-03.mg/kg <br /> DHS LUFT method for organic lead - <br /> U Method:detection limit:Soil-0.5 mg/kg <br /> Decontamination Procedures: <br /> iBetween sampling attempts,the samplerwillbe dissassembled and washed in a trisodium phosphate.(TSP).solution, <br /> l.i <br /> rinsed twice with.purified water,and reassembled with stainless steel sleeves to minimize the potential of <br /> spreading contaminants among samples.Decontamination water will be retained in approved drums onsite. <br /> LI <br /> fProposal . <br /> U Stockton Service Center <br /> DAMES 6L MOORE <br />