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Monitor Well Abandonment Request <br /> Sharpe Army Depot, Lathrop, California <br /> RE: Abandonment of MW-520A, MW-520B and MW-520C, Sharpe Army Depot, <br /> Lathrop, California. <br /> Following the USATHAMA Geotechnical Requirements for monitoring well <br /> abandonment, Environmental Science and Engineering, Inc. (ESE) is submitting the <br /> following information. <br /> III.A.11.a.(1) Boreholes proposed to abandon include monitoring wells MW-520A, <br /> MW-520B and MW-520C. <br /> IH.A.11.a.(2) Current statuses of the above mentioned monitoring wells are <br /> summarized in the attached boring logs which include well construction diagrams. <br /> III.A 11.a.(3) The monitor wells are to be abandoned due to their status as clean <br /> during all previous sampling efforts. The maintenance of these wells is not <br /> practical, due to their lack of potential use to delineate. a contaminant plume <br /> from Sharpe Army Depot. The property owner is developing the land for <br /> residential use where these wells are located. <br /> Abandonment procedures are to be as follows. Due to clean status of the monitoring <br /> wells, according to the California Water Well Standards, Bulletin 74-90, Section 23, the <br /> wells shall be grouted from the bottom of the well to five feet below ground surface. <br /> The 0.010 inch screen in the bottom of the wells shall be punctured in order to saturate <br /> the sand filter pack with grout. A 3% bentonite- 97% portland cement mixture grout <br /> will be tremied to the bottom of each well and allowed to set. A pit shall be dug <br /> around the upper 5 feet of each well. The top 5 feet of the well will then be cut off. <br /> The pit is then to be filled in with native soil. <br />