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� b • L1 Levine•Fricke•Recon ENGINEERS,HVDROGEOLOGISTS 8 APPLIED SCIENTISTS October 16, 1997 4111.55-007 via fax and overnight mail Ms. Mary F. Meays, R.E.H.S. San Joaquin County Public Health Services, Environmental Health Division 304 East Weber Avenue, Third Floor P.O. Box 388 Stockton, CA 95201-0388 Subject: Monitoring Well MW-21 Evaluation and Recommendations, Lincoln Center, Stockton, California Dear Ms. Meays: On behalf of the Settling Dry Cleaning Defendants, Levine-Fricke-Recon Inc. (LFR) is transmitting the attached report, entitled "Monitoring Well MW-21 Evaluation and Recommendations, Lincoln Center, Stockton, California," dated October 16, 1997. This report describes the investigation work performed to evaluate the integrity of well MW-21, including details of the installation, development, and sampling of a set of nested replacement wells (MW- 203B-1,2,3). The replacement wells were installed approximately 20 feet upgradient of MW-21 for the purpose of assessing the vertical distribution of Hazardous Substances in the B-zone aquifer near well MW-21. As described in the attached report, LFR recommends that well MW-21 be abandoned. This letter described the proposed procedures to abandon well MW-21. Well History Well MW-21 was drilled to a total depth of 149 feet below ground surface (bgs) using the mud- rotary drilling method (Kennedy/Jenks Consultants 1991). The borehole was backfilled from 149 feet bgs to a depth of 117 feet bgs using filter pack material. The well was constructed from 117 feet bgs to the ground surface using a 5-inch-inner-diameter steel casing with a screened interval extending from 97 to 117 feet bgs. A conductor casing was not installed in this well. Well Abandonment Method To successfully abandon this well, the steel casing must be removed and the entire borehole must be overreamed to remove the filter pack and cement grout materials. Once overreamed, the borehole will then be grouted to the ground surface using neat cement. 1900 Powell Street, 12th Floor, Emeryville, California 94608-1827 • (510) 652-4500 • fax (510) 652-2246 Offices Worldwide