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Geological TOMM CS <br /> Confirmation GW Sampling WP <br /> Project No.770.2 <br /> February 28,2011 <br /> 2.4.1 Groundwater Sampling Procedure <br /> Before sampling is attempted, the wells.;will be sounded for depth to water. The wells will be <br /> purged using a dedicated Waterra® check-ball assembly;arid 1/2 inch tubing. Purging will <br /> continue until the temperature, conductivity and pH of!the groundwater have stabilized <br /> (<10% variation among three readings) indicating that formation water representative of <br /> aquifer conditions is entering the wells. Water quality parameters will be measured at <br /> intervals of each well volume purged. <br /> r Once purging is complete, a water sample will be collected from the Waterra® tube. Care <br /> L will be taken to minimize sample agitation. Once the sample container is filled and capped, <br /> the bottle will be inverted, tapped and checked for headspace bubbles. The sample container <br /> will be identified and labeled with a unique designation, inserted into foam holders and <br /> placed into an ice chest cooled to 4°C for transport to the laboratory. <br /> All non-disposable sampling equipment will be decontaminated in an Alconox® solution and <br /> will be double-rinsed with de-ionized water before initial use and between uses at each <br /> monitoring well. Disposable gloves were used by the technician to collect all samples and <br /> were changed with each sample collection. <br /> A chain of custody document, listing all samples collected, will accompany the samples from <br /> field to laboratory, thereby providing a means to track their movement and insure their <br /> integrity. <br /> All water purged from each monitoring well and not used as a sample will be placed in.a <br /> properly labeled 55 gallon DOT approved container and stored. on-site until its proper <br /> r disposition can be arranged. <br /> 2.5 Groundwater Laboratory Analysis <br /> All groundwater samples will be submitted to a State Certified Laboratory for analysis. The <br /> laboratory will be selected through a bidding process after Work plan approval. Groundwater <br /> samples will be submitted for the following analysis: <br /> ■ Total Petroleum Hydrocarbons as Diesel (TPH-D) by EPA method 8015B(M) <br /> ■ Benzene, Toluene, Ethyl Benzene and Xylenes (BTEX)by EPA method 8260 <br /> ■ Naphthalene by EPA method 8260 <br /> Geological Tectmics/nc. 6 <br /> 7702 Confirmation GW Sampling 2-25-1 l.doc <br />