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LE <br />Advanced <br />GeoEnvironmental, Inc. <br />12 May 2010 <br />AGE-NC Project No. 06-1468 <br />to.AY 1 4 2019 <br />Mr. James Barton <br />Regional Water Quality Control Board - Central Valley <br /> ENVIRONMENT HEALTH <br />PERMIT/SERVICES <br />11020 Sun Center Drive #200 <br />Rancho Cordova, California 95670 <br />Subject: Well Destruction Report <br />GARDNER PROPERTY <br />26090 N. Thornton Road, Thornton, California <br />Dear Mr. Barton: <br />At the request of Mr. Ron Barber, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Well <br />Destruction Report for 26090 North Thornton Road, Thornton, California. The site setting is <br />illustrated in Figure 1. Site structures and former monitoring well locations are depicted in Figure 2. <br />INTRODUCTION/BACKGROUND <br />Ground water monitoring and remediation wells MW-1 through MW-7, VW-1 through VW-3 and <br />AW-1, were previously installed at the site as part of a leaking underground storage tank (UST) <br />investigation. All wells were single completed as either two or four-inch diameter wells to total <br />depths of 13 (VW-1 through VW-3), 20 (MW-7), 23 (AW-1), 27 feet (MW-1), 28 feet (MW-2 and <br />MW-3) and 30 feet (MW-4 through MW-6) below surface grade (bsg). <br />PROCEDURES <br />On 03 and 04 May 2010, a total of eleven (11) ground water monitoring and remediation wells were <br />destroyed at the site under San Joaquin County Environmental Health Depaanient (EHD) well <br />destruction permits (Appendix A). Well destruction activities were performed by All Well <br />Abandonment, Inc. ofPlacerville, California. Prior to well destruction, each well casing was sounded <br />with a Solinst water level meter to ensure that no obstructions were present in the casings. <br />In accordance with the AGE prepared, Work Plan for Well Destruction, dated 27 January 2010, <br />monitoring wells MW-3 and MW-4 were overdrilled to a total depth of 30 bsg utilizing a CME-75 <br />HT hollow stem drill rig equipped with 8-inch diameter hollow stem augurs. Thereafter, the overbore <br />void space was backfilled utilizing portland type II grout (a ratio of six gallons of water for every 94- <br />pound sack of portland cement was utilized to prepare the grout mixture). Each well was filled to <br />approximately one foot bsg and finished at the surface with either cement or native materials. <br />8 37 Shaw Road. Stockton, California 95215 <br />Telephone (209) 467-1006 Fax (209) 467-1118