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ameO <br /> Memo <br /> To: Mike Infurna Project: 14143.000 Task 5 <br /> From: Heidi Dietrich <br /> Tel: (510) 663-4133 <br /> Fax: (510) 663-4141 7f� <br /> Date: 2/18/2010 <br /> 28 <br /> Subject: Workplan for Soil and Groundwater Borings at the Tracy Railyard Site <br /> On behalf of Chevron Environmental Management Company (Chevron), AMEC Geomatrix <br /> plans to advance 14 soil borings at 6 locations at the Tracy Railyard site (located at 6th St. and <br /> Central Ave. in Tracy, CA) from March 8 to 10, 2010. Two of the boring locations will be <br /> sampled for soil and groundwater to a depth of 22 feet bgs using a Geoprobe direct push rig <br /> operated by PeneCore Drilling. The other 4 locations will be sampled for groundwater only, with <br /> three hydropunch borings advanced per location to different depths, for a total of 12 hydropunch <br /> borings. Six of the groundwater samples will be collected at depths up to 45 feet bgs using a <br /> Geoprobe direct push rig operated by PeneCore Drilling. The remaining six groundwater <br /> samples will be collected at depths up to 85 feet bgs using a CPT direct push rig operated by <br /> Gregg Drilling. Boring locations are shown on the Figure attached. <br /> The borings will be destroyed by using Portland Type 1/II neat cement grout, placed from total <br /> depth to 3 feet bgs using a tremie pipe. The top 3 feet will be filled with hydrated bentonite <br /> granules to ground surface. All soil cuttings and wash/purge water will be properly stored on <br /> site in 55-gallon drums to be removed by Chevron. Please contact me or Mari Gilmore at <br /> 510-663-4163 with any questions. <br /> �0 6 <br /> Sincerely yours, 7 U <br /> AMEC Geomatrix, Inc. <br /> 728 <br /> �9 <br /> Heidi Dietrich <br /> Staff Scientist <br /> Direct Tel.: 510-663-4133 <br /> Direct Fax: 510-663-4141 <br /> E-mail: heidi.dietrich@amec.com <br /> is\project\14000\14143.000\5000 investigation\permits\memosoil bore.doc <br /> AMEC Geomatrix, Inc. <br /> 2101 Webster Street, 12th Floor <br /> Oakland,California <br /> USA 94612-3066 <br /> Tel (510)663-4100l <br /> Fax (510)663-414141 . Geomatrix <br /> www.amecgeomatrixinc.com <br />