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4 .F A. `* <br /> IDOULOs <br /> Environmental, Inc. <br /> Telephone: (916)990-0333 <br /> FAX: (916)990-0332_ <br /> P.O. Box 2559.Oran=evale.CA 95662 e-insil: doulosenv@comcast.net. <br /> July 20, 2009 <br /> Mr. Harlin Knoll <br /> Public Health Services, San Joaquin County <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Well Abandonment Report for <br /> 2450 So. El Dorado`St., Stockton, CA <br /> Dear Mr. Knoll: <br /> Doulos Environmental, Inc. (Doulos) has been contracted by Dennis Kim (subject property owner) <br /> to abandon three monitoring"wells and prepare this report for the subject site. The purpose of this <br /> work was to meet.the requirements for case closure for the underground storage tank investigation <br /> that was conducted at this site as requested in the September 13, 2004 closure report by Advanced <br /> GeoEnvironmental, Inc. <br /> FIELD WORK <br /> The work performed included: Obtaining well abandonment permit from San Joaquin County . <br /> (permit enclosed), abandonment of three monitoring wells and preparing a report;which presents <br /> field procedures and volumes of grout, used. All activities were.completed in compliance with the <br /> San Joaquin County guideline and California State Department of Water Resources Bulletin 74-&1. <br /> Pressure Grouting <br /> On July 10, 2009, Doulos personnel abandoned three monitoring wells. Prior to pressure grouting <br /> the wells, the volume of grout needed to displace the pore space in the sand pack, and the volume of <br /> the casing was calculated. The wells were abandoned in.place by pressure grouting With a neat <br /> cement slurry. The grout was placed with a tremmie hose from approximately five feet above the <br /> bottom of the well to the surface.After the grout had been tremmied to the surface additional grout <br /> was added to maintain'the grout level at the top of the casing as it pushed its way into the sand pack <br /> pore space. The actual volume of grout placed in each well exceeded the calculated volume (see <br /> Table 1). Well covers were removed and approximately three feet of the top portion of the casing <br /> was removed. Portland was mushroomed over the top of the remaining casing: <br />