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WEST & HANSEN ENGINEERS, INC. <br /> P. O. Box 5891, Vacaville, California 95696 • (707) 451-1360 <br /> April 5, 1991 <br /> San Joaquin County APR 9 i4WQn1� <br /> Public Health Services ENVIRONMENTAL HEALTH <br /> PO Box 2009 PERMIT/SERVICES <br /> Environmental Health Division <br /> 1601 East Hazelton Avenue <br /> Stockton, CA 95201 <br /> Attn: Letitia Resch REHS <br /> Subject: Addendum to Closure In Place Proposal; Underground Boiler <br /> Fuel Tank - Stockton Developmental Center <br /> Dear Ms. Resch, <br /> In reply to our telephone conversation of Thursday March 28, 1991 , <br /> we respectfully submit the following additional information <br /> describing our proposed underground tank closure in place at <br /> Stockton Developmental Center. <br /> 1 . TANK ID NUMBER <br /> Stockton DC staff refer to the tank in question as tank no. 6. To <br /> maintain consistency with Environmental Health Division records, we <br /> will refer to this tank as no. 3 in the future. <br /> 2. PIPING ABANDONMENT <br /> There is an underground product pipeline extending from the fuel <br /> storage tank to the Boiler Plant, a distance of 90 feet. Most of <br /> the pipe run is under concrete pavement. Our preferred alternative <br /> is to remove the piping, at least to its entrance under the Boiler <br /> Plant building foundation. The piping will be removed unless other <br /> overlying utilities make this approach 'impractical. Stockton DC <br /> Plant Operations personnel are currently investigating the <br /> positioning of potentially interfering utility lines in order to <br /> determine the feasibility of removing the tank No. 3 fuel pipeline. <br /> If removal of the fuel pipeline proves to be impractical, we <br /> propose to close it in place. To determine if the line has leaked <br /> we will take one soil sample from the pipe bedding for every 20 <br /> lineal feet of pipe run. Each sample will be discreetly analyzed <br /> for TPH and BTXE utilizing the methods described later in this <br /> addendum. <br /> If the pipeline is found to have leaked, a Notice of Unauthorized <br /> Release will be filed with the Environmental Health Division and a <br /> workplan for assessing the degree of soil contamination will be <br /> prepared. <br />