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April 2015 <br /> AGE Project No. 15-3394 <br /> Page 3 of 4 <br /> SOIL-VAPOR SAMPLING <br /> Soil-vapor samples will be collected at depths of approximately five and ten feet bsg. <br /> Prior to sampling, temporary soil-vapor wells will be installed in each soil-vapor boring <br /> advanced. <br /> For installation of the soil-vapor wells, temporary/disposable vapor-tips and seven feet <br /> of '/4-inch Teflon tubing will be lowered to the base of the borings for the five foot <br /> samples and twelve feet of tubing will be lowered to the base of the borings for the ten <br /> foot soil-vapor samples; two feet of tubing will remain outside the boreholes for vapor <br /> sample collection. Once the tubing and vapor-tips are in place, a filter pack of #3 sand <br /> will be placed from the bottom of the boreholes to one foot above the base of the <br /> boreholes. Following placement of the filter pack, one-foot of dry bentonite crumbles will <br /> be placed atop the filter packs. Thereafter, additional bentonite will be placed and <br /> hydrated above the dry bentonite to near surface grade to seal the vapor wells from <br /> ambient air intrusion. Once vapor wells are set, a half-hour equalization time will be <br /> observed prior to sampling. <br /> Prior to sample collection the boring trace and tubing will be purged for a minimum of <br /> one-minute utilizing a peristaltic pump calibrated to 200 ml per minute. Once purged, <br /> soil vapor samples will be collected into 1-liter Tedlar bags. <br /> Each soil-vapor boring location will be isolated from ambient air by enclosing the <br /> borehole and tubing in a plastic shroud, which will be weighted at the surface. Isopropyl <br /> alcohol (IPA) as a liquid will be placed in a stainless steel bowl within the plastic <br /> structure and allowed to volatilize into the air enclosed within the plastic structure <br /> surrounding the borehole and tubing. <br /> The samples will be transported under chain-of-custody procedure to a CDPH-certified <br /> laboratory. Each sample container will be labeled with sample designation, time, date <br /> and sampler's initials and analyzed for VOCs, and IPA by EPA Method 8260B. <br /> EQUIPMENT DECONTAMINATION/WASTE MANAGEMENT <br /> Prior to use, all non-disposable sampling tools used for sample collection will be <br /> thoroughly rinsed with clean water after being washed with a solution of Alconox. Any <br /> soil or water waste generated during field activities will be containerized in properly <br /> labeled DOT-approved 55-gallon drums, and stored on-site in an area lacking public <br /> access. Disposal alternatives will be evaluated based on results of soil and water <br /> analysis. <br /> Advanced GcoEnvironmcntal,Inc. <br />