Laserfiche WebLink
OCT 16'97 17:39 FR LEVINE F W E 510 6524906 TO 1209 683433 P .02i06 <br /> g0j) K"ML@YWfOACOM IttE 1"I006"(E•R�Qti <br /> October 16, 1997 4111.55-007 <br /> via far and overnight mail <br /> Ms. Mary F. Meat's, R.E.H.S- <br /> San Joaquin County Public Health Services, <br /> Environmental Health Division <br /> 304 East Weber Avemte, Third Floor <br /> P.O. Box 398 <br /> Stockton, CA 95201-0388 <br /> Subject: Monitoring Well MW-21 Evaluation and Reconimendatiom, Lincoln Center, Stockton, <br /> California <br /> Dear Ms. Meays: <br /> On behalf of the Settling Dry Cleaning Defendants, Levine•Fricke-Recon Inc. (LFR) is <br /> transmitting the attached report,entitled"Monitoring Well MW-21 Evaluation and <br /> Recommendations, Lincoln Center, Stockton, California," dated October 16, 1997. This report <br /> describes the investigation work performed to evaluate the integrity of well MW-21, including <br /> details of the installation, development, and sampling of a set of nested replacement wells(MW- <br /> 20313-1,2,3). The replacement wells were installed approximately 20 feet upgradient of MW-21 <br /> for the purpose of assessing the vertical distribution of Hazardous Substances in the B-zone aquifer <br /> near well MW-21. <br /> As described in the attached report, LFR recommends that well MW-21 be abandoned. This letter <br /> described the proposed procedures to abandon well MW-21. <br /> Well History <br /> Well MW-21 was drilled to a total depth of 149 feet below ground surface (bgs) using the mud- <br /> rotary drilling method(Kennedy/Jenks Consultants 1991). The borehole was backfilled from 149 <br /> feet bgs to a depth of 117 feet bgs using filter pack material. The well was constructed from 117 <br /> feet bgs to the ground surface using a 5-inch-inner-diameter steel Casing with a screened interval <br /> extending from 97 to 117 feet bgs. A conductor casing was not installed in this well. <br /> Well Abandonment Method <br /> To successfully abandon this well, the steel casing must be removed and the entire borehole must <br /> be overreamed to remove the filter pack and cement grout materials. Once overreamed, the <br /> borehole will then be grouted to the ground surface using neat cement. <br /> 1900 Powell Street. 12th Floor, Emeryville. California 94608.1827 • (510) 552-4500 • tax (510) 652-2246 <br /> Offices workwide <br />