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f° <br /> ATTACHMENT 1 <br /> FIELD AND;QA/QC PROCEDURES <br /> Health and Safety <br /> Orion will modify the site-specific Health and Safety Plan (HSP) for the investigation <br /> outlined in this work plan. The HSP" resents procedures for personnel and equipment <br /> safety, medical surveillance, personal protection, air-quality monitoring, exposure control, <br /> emergency response procedures, and general work practices. <br /> Before beginning work at the site a sitesafet meeting <br /> will be <br /> conducted. Field <br /> personnel <br /> � <br /> will review the HSP and sign the accompanying acknowledgment form. Field personnel <br /> will be required to comply with the HSP throughout performance of site assessment <br /> activities. <br /> Based on the site history and potential chemicals of concern, field activities will be <br /> initiated in Level D personal protective equipment (PPE). During field. activities, the <br /> breathing zone of field personnel will be monitored using a field photoionization detector <br /> (PID). If breathing zone PID readings indicate elevated levels of organic vapors, PPE will <br /> be upgraded accordingly. Breathing zone readings will be recorded on the boring logs. f <br /> i <br /> The following sections provide a detailed description of Orion's well abandonment <br /> program. 1 <br /> 1. <br /> Overdrilling and Abandonment Procedures (MW-1, MW-2, MW=3) <br /> I <br /> Orion will obtain well destruction permits from the San Joaquin County Environmental <br /> Health Division and an encroachment permit from the City of Stockton. <br /> The borings for the abandonment oLithe monitoring wells will be drilled with'8-inch- <br /> diameter, hollow-stem, continuous-flight augers. Auger cuttings (grout and soil) and <br /> generated wastewater will be placed into 55-gallon drums and hauled off site for disposal. <br /> The well casing and other well materials will be pulled out of the well and disposed of <br /> properly. The former well borings will be backfilled with a bentonite slurry using the <br /> hollow-stem auger as a tremie pipe. After allowing the bentonite slurry to settle, the <br /> [S:\BFS\Stockton\WKP\WKP004.doc] 11/13/01 <br />