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1 ' Bl. Drilling and Soil Sampling Procedures 1 Borings were drilled using CME 75 or a Mobile B-51 drilling ng equipped with 8-inch or ' 10-inch outside diameter (OD) hollow-stem augers Prior to drilling borings were hand augered down to 5 feet bgs Drilling services were provided by West Hazmat Drilling Corporation of Rancho Cordova, California 2 The augers were steam-cleaned prior to the drilling of each boring ' 3 Soil cuttings generated from the drilling operations and liquids generated during decontamination and development activities were stored in Department of Transportation (DOT)-approved, 55-gallon steel drums ' 4 Soil descriptions (in general accordance with the Unified Soil Classification System), sample type and depth, and related drilling information were recorded on a boring log ' and reviewed by a State-Registered geologist from Tait Environmental Management, Inc (TEM) ' 5 Soil samples were collected at approximately 5-foot depth intervals or at significant changes in lithology, whichever occurred first, using a 2-inch(inside) diameter split- barrel California modified sampler, continuing to the bottom of the boring 6 The sampler was washed between sampling intervals, using a bristle brush, with a non- phosphate containing detergent solution, this was followed by two tapwater rinses The ' sampler was dried by air or with a paper towel prior to being used for sampling 7 Soil samples were collected in three 6-inch long by 2-inch diameter brass tubes inside the ' sampler Prior to use, the sample tubes were washed, rinsed, and dried using the procedures described in item 6 8 The sampler was driven using a 140-pound hammer dropping approximately 30 inches The number of blows (blow count) required to advance the sampler 18 inches in 6-Inch Increments was recorded on a boring log ' 9 Following retrieval of the sampler, the bottom 6-Inch long tube was removed from the sampler, its ends were covered with Teflon tape and capped with polyvinyl chloride ' (PVC) end caps Each sample tube was labeled with the sample number, depth, collection date/time, and project number, and were submitted to the on-SITE mobile laboratory for analysis ' 10 The soil retained in the middle sample tube was used to describe the soil lithology and to measure volatile organic compounds (VOC's) using a Photoionization Detector (PID) ' calibrated to a 100 ppm hexane standard Approximately one-half of the soil was • removed and placed within a plastic bag The sample in the bag was then agitated and set aside to allow organic vapors, if present, to accumulate In the void space (headspace) of rthe bag The VOC concentration in the headspace was then recorded with the PID The measurements were considered in the selection of soil samples for laboratory analyses I