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' PROTOCOLS FOR INSTALLATION, SAMPLING, AND ABANDONMENT . OF EXPEDITED SITE ASSESSMENT BORINGS 1 SINGLE TUBE SOIL CORING PROCEDURES ' Prior to drilling, the proposed boring locations will be cleared utilizingthe services of Underground � Service Alert(USA) and a utility line locating service ' Soil samples will be collected for hthola is and chemical analysis using a direct driven single tube soil coring system A hydraulic hammer will drive sampling rods into the ground to collect ' continuous or discrete soil cores As the rods are advanced, soil is driven into an approximately 1 5- inch-diameter sample barrel that is attached to the end of the rods Soil samples are collected in sleeves inside the sample barrel as the rods are advanced After being driven 2 to 4 feet(depending ' on the sample interval and the length of the sample barrel), the rods are removed from the borehole The sleeves containing the soil samples are removed from the sample barrel, and can then be ' preserved for chemical analyses or used for hthologic identification Samples to be preserved for chemical analyses are sealed with Teflon tape and caps and placed in a cooler with ice After adding new sleeves, the drive sampler and rods are then lowered back into the borehole to the previous ' depth and the process is repeated until the desired depth is reached All drive casing, sample barrels, rods, and tools will be cleaned with Alconox or equivalent detergent ' and delomzed water All soil will be contained in drums or stockpiles at the project site for later disposal ISOIL GAS SAMPLING PROCEDURES Soil gas samples will be collected for chemical analysis using a direct driven single tube system A hydraulic hammer will drive the sampling rods into the ground to the desired depth of the soil gas sample The soil gas sample is collected using the GeoProbe Post-Run Tubing(PRT) System Once I the PRT tubing system is inserted into the rods and connected to the PRT expendable point holder, the rods are retracted at a desired interval and the expendable drive point on the bottom of the rods is released A vacuum is then applied to the tubing to purge the ambient air The soil gas sample is then collected in a summa canister A summa canister is a 6-liter stainless steel vessel which has had the internal surfaces specially passivated using a"Summa"process The summa canister arrives pre-cleaned from the laboratory and with an internal vacuum of between 25" Hg and 30" Hg Prior to use, the pressure in the summa canister is checked with a pressure gauge to ensure a vacuum of at least 25"Hg for quality control purposes Once the PRT tubing has been purged of ambient air, the vacuum system is shut off and, without exposing the tubing to the ambient air, it is connected to a summa canister A particulate filter is used in-line to filter out particles and liquids, and a pressure gauge may be used in-line or after sampling to check the final pressure The valve on the summa canister is opened, and the soil gas sample is drawn into the canister A small vacuum of about 5" Hg is left inside the canister and is recorded on the chain-of-custody Upon receipt the laboratory will check the pressure in the canister and compare it to the pressure recorded on the chain-of custody for quality control purposes G\Projects%739421NiASTER%WP4RaOSO 15pi olocois$16Rsg01 doc 1