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08 April 1997 <br /> AGE-NC Project No. 95-0167 <br /> Page 4 of 4 <br /> l Service Alert (USA) check of underground utilities or pipes. <br /> 4. Install five probe borings, using a van-mounted Geoprobe equipped with a 1 .25 -inch <br /> diameter probe rods and a 2. 15-inch diameter soil sampler. Probe borings will be advanced <br /> to depths of approximately 25 feet. Boring locations are illustrated on Figure 2 . <br /> 5 . Decontaminate sampling equipment in an Alconox solution and rinse twice with water prior <br /> to each sampling run. <br /> 6 . Obtain discrete soil samples at five foot intervals using a Geoprobe soil sampling assembly <br /> loaded with four pre-cleaned 1 . 125 -inch by 6-inch brass sleeves. <br /> 7 . Preserve soil in the second brass sleeve by covering both ends with Teflon sheets, capping, <br /> and sealing with tape. Label and log samples on a chain-of-custody form. <br /> S . Screen soil sample duplicates for the presence of volatile organics using a photo-ionization <br /> detector (PID) pre-calibrated to isobutylene. <br /> i <br /> 9 . Log borings in accordance with the Unified Soil Classification System. <br /> 10 . Collect three ground water samples. Ground water samples will be collected from selected <br /> probe borings using a Geoprobe water sampling assembly. Samples will be collected in 40- <br /> ml VOA vials , labeled and placed in a chilled container. <br /> 11 . Backfill each probing using a Portland cement slung in the entire depth of the boring. <br /> 12. Selected soil and ground water samples will be transported to a State-certified laboratory and <br /> analyzed for TPH-g, BTE&X and MTBE in accordance with the appropriate EPA methods. <br /> 4 .2 . REPORTING <br /> A Closure Summary Report (CSR), if applicable, detailing the site conditions will be prepared . The <br /> report will be in a format acceptable to the PHS-EHD and CVRWQCB . The report will be reviewed <br /> and signed by a California Registered Geologist. <br />