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Geological Technic Inc. <br /> Confirmation GW Sampling WP <br /> Project No. 770.2 <br /> February 28,2011 <br /> collected from each borehole. The samples will be collected using small diameter poly <br /> tubing with a Waterra® check-ball attachment and gently transferred into VOA vials. <br /> - <br /> Groundwater samples will be submitted to a California Certified Laboratory for the analyses <br /> outlined in Section 2.5 below. <br /> 2.3 Conformational Groundwater Sampling(Water Supply Wells) <br /> Per the SJC PHS/EHD directive dated January 11, 2011, conf�rmational groundwater <br /> samples will be collected in the water supply wells within 600 feet of the site. As discussed <br /> in Section 2.1 above, the number and location of water supply wells within 600 foot radius of <br /> the release will be confirmed by review of DWR logs followed by site reconnaissance. <br /> i <br /> 2.3.1 Groundwater Sampling Procedure <br /> Before sampling is attempted, water supply well samplingports will be decontaminated in an <br /> Alconox® solution and will be double-rinsed with de-ionized water. Water supply wells will <br /> then be purged by activating their respective well pumps for ten to fifteen minutes prior to <br /> sample collection. <br /> Once purging is complete, a groundwater sample will be collected from the sampling port. <br /> Care will be taken to minimize sample agitation. Once the sample container is filled and <br /> capped, the bottle will be inverted, tapped and checked for;headspace bubbles. The sample <br /> container will be identified and labeled with a unique designation, inserted into foam holders <br /> and placed into an ice chest cooled to 4°C for transport to the laboratory. <br /> Disposable gloves will be used by the sampling technician to collect all samples and will be j <br /> 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 ensure their <br /> i <br /> integrity. <br /> All water purged from the water supply wells will be considered unregulated material and <br /> will be discharged to the land. <br /> 2.4 Conformational Groundwater Sampling (Monitoring Wells) <br /> Per the SJC PHS/EHD directive dated January 11, 2011, conformational groundwater <br /> - <br /> - - W-7. <br /> samples will be collected from MW-1, MW 4, MW 5, MW 6 and M t[- <br /> i <br /> Geological Tec&ks Inc. 5 <br /> 7702 Confirmation GW Sampling 2-25-1 Ldoc <br /> I , <br />