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Cl �. ATTACHMENT B IT'S FIELD AND LABORATORY PROCEDURES Exploratory Drilling The soil borings were drilled using 8-inch hollow-stem auger drilling equipment Bonngs were logged by an IT geologist or engineer using the Unified Soil Classification System and standard geologic techniques Soil samples were collected at 5-foot depth intervals using a California- modified split-spoon sampler The sampler was driven a maximum of 18 inches using a 140-pound hammer with a 30-inch drop All soil samples for chemical analysis were retained in brass liners, capped with Teflon squares and plastic end caps, and sealed in ZiplockTm-style bags The samples were placed on ice for transport to the laboratory accompanied by chain-of-custody documentation All down-hole drilling and sampling equipment was steam-cleaned following the completion of the soil boring Down-hole sampling equipment was washed in a tnsodium phosphate or alconox solution between samples Groundwater Monitoring Well Installation Groundwater monitoring wells were completed in three soil borings by installing 2-inch diameter, flush-threaded, Schedule 40 PVC casing with 0 020-inch factory-slotted screen Approximately 10 feet of screen was used to construct the monitoring wells An RMC 2112 sand pack, or equivalent, was placed in the annular space across the entire screened interval, and extended approximately 2 feet above the top of the screen for the well A 2 to 3-foot bentonite transition seal was placed atop the sand pack, and a Portland cement seal extended from the bentonite transition seal to the ground surface The Portland cement seal was emplaced by tremie pipe or through the center of the hollow-stem augers in one continuous operation from the bottom of the interval to be filled to the top Emplacement of the Portland cement grout specifically was not accomplished by "free fall" from the ground surface Boring logs show well construction details The groundwater monitoring wells were developed by GRI after completion The development procedure for each well consisted of pumping and bailing water from the well until the water was visibly clear, the well went dry, or until a maximum of ten casing volumes had been removed Organic Vapor Procedures Soil samples collected at 5-foot depth intervals during drilling were analyzed in the field for ionizable organic compounds using a flame-ionization detector(FID) or a PID with a 10 2 eV IT CORPORATION SAC U\Tosco Marketing\4409\Reports\AsmtRpt doe-00\s 1 B-1