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KAPREALIAN ENGINEERING <br /> I N C 0 R P 0 R A T E D <br /> KEI-P92-0205 .P4 <br /> October 26 , 1994 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P.O. Box 5155 <br /> San Ramon, California 94583 <br /> Attention: Mr. Robert A. Boust <br /> RE: Work Plan/Proposal <br /> Proposed Destruction of Monitoring Wells <br /> Former Unocal Bulk Plant #0950 <br /> 2835 Navy Drive <br /> Stockton, California <br /> Dear Mr. Boust: <br /> Per your request, this work plan/proposal for the destruction of <br /> existing monitoring wells MW1 through MW7 at the subject site is <br /> presented for your consideration. As outlined in a letter from the <br /> San Joaquin County Public Health Services Department (SJCPHS) and <br /> addressed to Unocal, a final site closure letter will be issued by <br /> the SJCPHS after the proper destruction of the monitoring wells. <br /> Site background information and a summary of our recent field <br /> activities are included in our Case Closure Report (KEI-J92- <br /> 0205 .R4) dated July 6, 1994 . <br /> PROPOSED WELL DESTRUCTION <br /> 1 . KEI proposes to destroy monitoring wells MW1 through MW7 <br /> by fully drilling out the existing well seals, all filter <br /> pack sand materials, and the PVC well casings. The seven <br /> monitoring wells extend to total depths ranging from 12 <br /> to 20 feet below grade. Permits will be obtained from <br /> the SJCPHS prior to beginning work. <br /> 2 . The former wells will be fully sealed by the use of <br /> either neat cement grout or 11-sack cement/sand slurry, <br /> in accordance with the grout mixing guidelines presented <br /> in the California Well Standards, Bulletin 74-90, dated <br /> June 1991. All grout will be placed by the use of a <br /> tremie pipe. Grout will be placed from the bottom of the <br /> borings up to the surface in one continuous pour. The <br /> upper 1 to 2 feet of grout may contain a hardening agent <br /> to allow for reduced .curing time. <br /> 2401 Stanwell Drive,Suite 400 <br /> Concord,California 94520 <br /> Tel:510.602.5100 Fax:510.6R7.0002 <br />