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==Mai [D) <br /> DOULOs { <br /> -AUG 1 2 2003 <br /> Environmental, Inc. F <br /> ENVIRONMENT HEALTH <br /> Telephone: (916)990-0333 <br /> f I 11�IIT�SIrF1Vl S FAX; (916)990-0332 <br /> P.O. Box 2559,Or angevale,CA 95662 ;) ;'' e-mail- doulosenv(a?,comcast.net <br /> ` if <br /> I �E <br /> August 5, 2003 <br /> Mr. Joseph Aldridge <br /> Valero Energy Corporation <br /> 685 West Third Street <br /> Hanford, California 93230 <br /> Subject: Well Abandonment Report for Former Beacon#610 <br /> 3300 Waterloo Road, Stockton, California <br /> Dear Mr. Aldridge: <br /> :j <br /> Valero Energy Corporation (Valero)has contracted Doulos Environmental Inc. (Doulos) to abandon <br /> monitoring and vapor extraction wells, as well as prepare this repoit for the subject site. The <br /> purpose of this work was to meet the requirements for case closure for the underground storage tank ' <br /> investigation that was conducted at this site as requested in the March 20, 2003 letter by Gordon <br /> Boggs from the California Regional Water Quality Control Board, Central Valley Region <br /> (enclosed). <br /> FIELD WORK <br /> The work performed included: Obtaining well abandonment permits from San Joaquin County <br /> (permits enclosed), abandonment of seven monitoring wells and three vapor extraction wells, and <br /> preparing a report which presents field procedures and volumes of grout used. All activities were <br /> completed in compliance with the San Joaquin County guideline and California State Department of <br /> Water Resources Bulletin 74-81. <br /> Pressure Groutine ;r <br /> On July 16 and 17, 2003, Doulos personnel abandoned seven'monitoring wells and three vapor <br /> extraction wells. Prior to pressure grouting the wells, the volume of grout needed to displace the <br /> pore space in the sand pack, and the volume of the casing wash calculated. The wells were <br /> abandoned in place by pressure grouting with a neat cement slurry. The grout was placed with a <br /> tremmie hose from approximately five feet above the bottom of the well to the surface. After the <br /> grout had been tremmied to the surface additional grout was added t'o maintain the grout level at the <br /> top of the casing as it pushed its way into the sand pack pore space. The actual volume of grout <br /> placed in each well exceeded the calculated volume(see Table). Well covers were removed and <br /> replaced with like-material to match the surrounding area. �� <br />