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AMERICAN GEOLOGICAL SERVICES . INC . <br /> — - Environmental, Geological, and Natural Resource Consultants <br /> Colorado • California Virginia • Hawaii Saipan <br /> �E C- V/ <br /> February 13, 2009 <br /> FEB 1 8 2009 <br /> Mr. Harlan Knoll ENVIRONMENT HEALTH <br /> San Joaquin County/Ehd PERMIT/SERVICES <br /> 600 E Main Street <br /> Stockton, CA 95202 <br /> RE: Well abandonment, 336 East Locust Street, Lodi, CA <br /> Dear Mr. Knoll, <br /> American Geological Services, Inc. has been retained my Mrs. Lucy Thater to abandon <br /> one soil vapor extraction well, and four ground water monitoring wells installed on her <br /> site at the address listed above. This letter work plan outlines the proposed well <br /> abandonment procedures to be followed. The well abandonment permit application and <br /> associated fee are attached to this letter. <br /> Scope of Work <br /> Five ground water monitoring wells were installed at the site, along with one soil vapor <br /> extraction well. The wells were designated MW-1 though MW-5 and VW-1, <br /> respectively. Monitoring well MW-3 was previously abandoned by pressure grouting. <br /> The current scope of work will include the pressure grouting of the remaining four <br /> monitoring wells and the one soil vapor extraction well. Each well will be abandoned <br /> using the same methodology. <br /> Each well will be sounded for total depth prior to abandonment. A tremie pipe will be <br /> installed into the well to within one foot of the bottom of the well, and connected to the <br /> grout mixing tank via pressure lines. A neat cement slurry will be prepared such that it <br /> contains no lumps. The grout will be injected into the well casing through the tremie <br /> pipe, and as the grout rises within the casing, sections of the tremie pipe will be removed <br /> to prevent loss within the well casing. Upon filling the well casing to the surface, <br /> pressure will be applied to ensure that the grout is forced into the sand pack within the <br /> well. <br /> The well box will be removed by hand digging, and the first three feet of the well casing <br /> will be exposed as practical. The exposed well casing will be cut off approximately two <br /> and a half feet below the ground surface, thereby leaving approximately six inches of <br /> casing extending above the bottom of the hand excavation. A concrete mushroom cap <br /> Tel. (209)532-8021 14847 Mono Way, Sonora, CA 95370 FAX(209)532-3809 <br />