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ATTACHM NT B <br /> FIELD AND LABORATC RY PROCEDURES <br /> s <br /> Exploratory Geoprobe® Procedures <br /> The probes for the soil and groundwater investigate n will be advanced using direct-push, <br /> hydraulic and percussion drive-point sampling syst m. This will involve the driving of a <br /> one-inch O.D. screen point sampler to groundwate (anticipated between 20 and 25 feet bgs). <br /> Five probes will be advanced at 5 foot intervals taking soil samples at these intervals. Five <br /> probes will be continuously cored taking samples ong the entire length. The borings will <br /> be logged by a PEG geologist using the Unified Soil Classification System and standard <br /> geologic techniques. <br /> Soil samples for chemical analysis will be retained in acrylic liners, capped with Tefloa and <br /> plastic end caps. These samples will be placed in a cooler on ice for transport to the <br /> laboratory accompanied by chain-of-custody documentation. <br /> Once groundwater is encountered, the sampler case will be retracted a distance corresponding <br /> to the length of an enclosed 112 inch x 18 inch stairless steel screen. This disengages an <br /> expendable point and allows the slotted screen toe end into the open borehole. The water is <br /> then allowed to enter the sampler through the screen for collection. <br /> Exploratory Hollow Stem Auger Drilling (HSA) <br /> The soil borings for well installations will be drilled using 8-inch hollow-stem auger drilling <br /> equipment to depths of approximately 35 feet belowground surface figs) or approximately <br /> 10 to 15 feet into first groundwater. Borings will be logged by a Pacific Environmental <br /> Group, Inc. geologist using the Unified Soil Classification System and standard geologic <br /> techniques. Soil samples for logging will be collected at 5-foot depth intervals using a <br /> 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 clean ZiplockTm 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 tri-sodium phosphate or alconox solution between f <br /> 911-007.1 B/WRKPLN B-1 <br /> i <br />