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ameO <br /> Memo <br /> To: Mike Infurna Project: 0141430000.00008 and <br /> From: Heidi Dietrich OD11161120.02 <br /> Tel: (510) 663-4133 <br /> Fax: (510) 663-414135�,� <br /> Date: April 1, 2011 �v N(pt <br /> t* RECEIVED <br /> Subject: Work Plan for Soil and Groundwater Borings APR 11 2011 <br /> Tracy Railyard Site <br /> Tracy, California ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> On behalf of Chevron Environmental Management Company (Chevron), AMEC Geomatrix <br /> plans to advance 23 soil borings at 15 locations at the Tracy Railyard site (located at 6th Street <br /> and Central Ave), along the shoulders of Baldwin Court and Rockingham Court north of <br /> Rockingham Way, and on the shoulder of West 6th Street at 7th Street in Tracy, California, from <br /> April 26 to May 6, 2011. Boring locations are shown on the figure attached. <br /> Five of the boring locations (TRYW-2, TRYW-3, TRYW-4, TRYW-5 and TRYW-7) will be <br /> sampled for soil to a depth of 25 feet below ground surface (bgs) using a Geoprobe direct push <br /> rig operated by PeneCore Drilling. Seven locations (TRYW-1, TRYW-8, TRY-31, TRY-32, <br /> TRY-24, TRY-35 and TRY-36) will be sampled for groundwater to a depth of 20 feet bgs using <br /> hydropunch-style tools and a Geoprobe direct push rig operated by PeneCore Drilling. Two <br /> locations (TRY-30 and TRY-33) will be sampled for groundwater with four hydropunch borings <br /> advanced per location to 35, 45, 55 and 65 feet bgs using a CPT direct push rig operated by <br /> Gregg Drilling. One location (TRYW-6) will be sampled for groundwater with three hydropunch <br /> boring advanced to 60, 70 and 90 ft bgs using a CPT direct push rig operated by Gregg Drilling. <br /> The borings located on soil will be destroyed by using Portland Type 1/II neat cement grout, <br /> placed from total depth to 3 feet bgs using a tremie pipe. The top 3 feet will be filled with <br /> hydrated bentonite granules to ground surface. Borings located on City of Tracy streets will be <br /> destroyed by using Portland Type 1/II neat cement grout, placed from total depth to ground <br /> surface using a tremie pipe. The top of the grout column will be colored to match street surface <br /> conditions and will be equal with street surface grade. All soil cuttings and wash/purge water will <br /> be properly stored on site in 55-gallon drums to be removed by Chevron. This work will be <br /> conducted under an encroachment permit with the City of Tracy. Traffic control including <br /> signage will be set up for all work in City Streets. <br /> C�T <br /> lJ" <br /> AMEC Geomatrix, Inc. <br /> 2101 Webster Street, 12th Floor <br /> Oakland,California <br /> USA 94612-3066 <br /> Tel (510)663-4100 <br /> Fax (510)663-4141 AMEC Geomatrix , <br /> www.amecgeomatrixinc.com <br />