Laserfiche WebLink
ameO <br /> Memo <br /> To: Mike Infurna Project: 14143.000 Task 5 <br /> From: Mari Gilmore <br /> Tel: (510) 663-4163 �✓���'3�,/ <br /> Fax: (510) 663-4141 <br /> Date: 8/24/09 <br /> Subject: Workplan to Destroy Soil Vapor Probes at Tracy Railyard Site <br /> On behalf of Chevron Environmental Management Company (Chevron), AMEC Geomatrix <br /> plans to destroy 5 soil vapor probes at the Tracy Railyard site(located at 61' St. and Central <br /> Ave. in Tracy, CA) on August 27th, 2009. The soil vapor probes are constructed of 2 nested <br /> probes (with 0.25" diameter polyethylene tubing)to 5 feet below ground surface (bgs) and 10 <br /> feet bgs, respectively. One foot of clean Monterey sand surrounds each probe at 5 and 10 feet <br /> bgs, with the remainder of the annular space filled with hydrated bentonite granules. The probes <br /> were installed using a 3"- diameter hand auger. <br /> The probes will be destroyed by drilling out the annular materials and tubing using a 4.5' <br /> diameter solid-flight auger to the total depth of 10 feet. The solid augers will drill out the <br /> bentonite, tubing, sand, etc. and bring everything up to the surface as cuttings. All drill cuttings <br /> will be properly stored in 55-gallon drums to be removed by Chevron. The borings will be <br /> destroyed by using Portland Type 1/11 neat cement grout, placed from total depth (10 feet)to 3 <br /> feet bgs using a tremie pipe. The top 3 feet will be filled with hydrated bentonite granules to <br /> ground surface. Please contact the undersigned with any questions. <br /> Sincerely yours, <br /> AMEC Geomatrix, Inc. <br /> Mari Gilmore <br /> Project Geologist <br /> Direct Tel.: 510-663-4163 <br /> Direct Fax: 510-663-4141 <br /> E-mail: mari.gilmore@amec.com <br /> is\project\14000\14143.000\5000 investigation\permits\memo soil vapor probe destruction.doc <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 <br /> www.amecgeomatrixinc.com <br />