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Workplan for Additional Assessment and Feasibility Testing 2 <br /> 7-Eleven,Inc.Store No.20632,4627 DaVinci Drive,Stockton,CA October 17,2001 <br /> To determine the vertical extent of the plume in the source area, one soil boring will be installed to depths <br /> of 40 feet below grade as shown on Figure 2, using Simulprobe (dual-barrel)/hydropunch technology. <br /> Health and Safety Plan/Permits <br /> The existing site-specific Health,and Safety Plan will be used during subsequent drilling operations. The <br /> Health and Safety Plan has been prepared as required by the Occupational Safety and Health <br /> Administration(OSHA) Standard"Hazardous Waste Operations and Emergency Response"guidelines(29 <br /> CFR 1910.120). The document-will be reviewed and signed by all IT Corporation personnel and <br /> subcontractors performing work at the site. <br /> All applicable permits will be obtained prior to field operations. <br /> On-site underground utilities will be marked by an,underground utility company, and Underground Service <br /> Alert(USA)will be contacted and requested to notify the local utility companies to mark the location of <br /> underground utilities surrounding the site. For offsite drilling, a private utility locating service may also be <br /> used. <br /> Drillin-g/Soil Sampling <br /> Drilling will be conducted using a truck-mounted drill rig equipped with 8-inch-diameter hollow-stem augers. <br /> Soil samples will be collected at 5-foot intervals to a total depth of each boring beginning at 5 feet below <br /> grade using a split-spoon sampler lined with 2-inch-diameter by 6-inch-long brass sample tubes. The <br /> hollow-stem augers will be steam-cleaned before;drilling, and sampling equipment will be cleaned between <br /> each sampling interval. Each soil sample will be screened for volatile content using a photoionization <br /> detector(PID). Soils encountered during drilling 'will be logged using the Unified Soil Classification System <br /> by an IT Corporation field geologist,working under the supervision of a California registered geologist. One <br /> sample tube from each sampling interval will be sealed with Teflon sheets, capped,taped, labeled, and <br /> placed on ice in an insulated container. <br /> 20632SAW.DOC <br /> J <br />