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• V <br /> ATTACHMENT C <br /> PRE-FIELD, FIELD, AND LABORATORY PROCEDURES <br /> Health and Safety Plan Preparation <br /> Prior to performing field work at the site, SECOR will prepare a Site-Specific Health and <br /> Safety Plan required by the Occupational Health and Safety Administration (OSHA) <br /> Standard"Hazardous Waste Operations and Emergency Response" guidelines (29 CFR <br /> 1910.120) and by California Occupational Health and Safety Administration <br /> (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR <br /> Title 8, Section 5192). <br /> Exploratory Drilling and Soil Sampling <br /> The soil borings will be advanced using 10-inch hollow-stem auger drilling equipment. <br /> Borings will be logged by a SECOR representative using the Unified Soil Classification <br /> System and standard geologic techniques. Soil samples for logging will be collected <br /> continuously using either a California-modified split-spoon sampler (above <br /> groundwater), or a Simui-Probe® or Enviro-Corea sampler. All soil samples for <br /> chemical analysis will be retained in brass, stainless steel, or plastic liners, capped with <br /> Teflon squares and plastic end caps, and sealed in zip-lock bags. The samples will be <br /> placed on ice for transport to the laboratory accompanied by chain-of-custody docu- <br /> mentation. All down-hole drilling and sampling equipment will be steam-cleaned <br /> following the completion of the soil boring. Down-hole sampling equipment will be <br /> washed in a tri-sodium phosphate or alconox solution between samples. <br /> Well Installation <br /> The borings will be converted to groundwater monitoring wells by installing 4-inch <br /> diameter, flush-threaded, Schedule 40PVC casing with 0.020-inch factory-slotted screen. <br /> The screen intervals will be installed in each well as described in the proposed scope of <br /> work section of the work plan. An RMC2/12 sand pack, or equivalent, will be placed in <br /> the annular space across the entire screened interval, and will extend approximately 1 to <br /> 2 feet above the top of the screen for the well. A bentonite and Portland cement seal will <br />