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ATTACHMENT B <br /> FIELD AND LABORATORY PROCEDURES <br /> Exploratory Drilling <br /> The soil bonngs will be drilled using 8-inch hollow-stem auger drilling equipment Borings <br /> will be logged by an IT geologist or engineer using the Unified Soil Classification System <br /> and standard geologic techniques Soil samples will be collected at 5-foot depth intervals <br /> using a California-modified split-spoon sampler The sampler will be driven a maximum of <br /> 18 inches using a 140-pound hammer with a 30-inch drop All soil samples for chemical <br /> analysis will be retained in brass liners, capped with Teflon squares and plastic end caps, and <br /> sealed in ZiplockTM-style bags The samples will be placed on ice for transport to the labora- <br /> tory accompanied by chain-of-custody documentation All down-hole drilling and sampling <br /> . equipment will be steam-cleaned following the completion of the soil boring Down-hole <br /> sampling equipment will be washed in a tnsodium phosphate or alconox solution between <br /> samples <br /> Groundwater Monitoring Well Installation <br /> Groundwater monitoring wells will be completed in up to five soil bonngs by installing <br /> 2-mch diameter, flush-threaded, Schedule 40 PVC casing Screen intervals will consist of <br /> approximately 20 feet of 0 020-inch factory-slotted casing Screen intervals will be placed <br /> approximately 5 feet above to approximately 15 feet below first encountered groundwater <br /> An RMC 2/12 sand pack, or equivalent, will be placed in the annular space across the entire <br /> screened interval, and will extend approximately 2 feet above the top of the screen for the <br /> well A 2 foot bentonite transition seal will be placed atop the sand pack, and a Portland <br /> cement seal will extend from the bentonite transition seal to the ground surface The Portland <br /> cement seal will be emplaced through the center of the hollow-stern augers <br /> The groundwater monitoring wells will be developed after completion The development <br /> procedure for each well will consist of pumping or bailing water from the well until the water <br /> is visibly clear, the well goes dry, or until a maximum of ten casing volumes have been <br /> removed <br /> IISACRFPIICOMMONIrancfpl\Projects\Projects1911100511001021WorkPlan doc <br /> B-1 <br />