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k "f <br /> KAPREALIAN ENGINEERING <br /> N C 0 R P 0 R A T E D <br /> KEI-P91-0202 .R8 <br /> March 14, 1996 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P.O. Box 5155 <br /> San Ramon, California 94583 <br /> Attention: Mr. David B. De Witt <br /> RE: Report of Destruction of Monitoring Wells <br /> Unocal Service Station #6015 <br /> 601 E. Kettleman Lane <br /> Lodi California <br /> Dear Mr. De Witt: <br /> INTRODUCTION J <br /> I <br /> This report documents the destruction of nine monitoring wells at <br /> the subject site, in accordance with K prealian Engineering, Ines. <br /> (KEI) work plan/proposal (KEI-P91-020 .P5) dated January 24 , 1996. <br /> The former wells, designated as MW1 through MW9 on the attached <br /> Figure 1, extended to total depths ranging from 70 to 85 feet below <br /> grade, and were proposed to be des royed due to pending site j <br /> closure. Site background information and a summary of our most <br /> recent field activities are included in KEI 's Site Investigation <br /> Summary letter dated November 2 , 1993 , and .the MPDS Services, Inc. <br /> report (MPDS-UN6015-04) dated December 7, 1995. <br /> RECENT FIELD ACTIVITIES <br /> On March 5, 1996, the nine existing monitoring wells (MW1 through <br /> MW9) were destroyed by pumping neat cement grout into the well <br /> casings. The grout was pumped under pressure from the total depth <br /> of each well to the surface by the use of a 0. 5-inch diameter PVC <br /> tremie pipe plumbed with a flexible hose to a grout pump. Mr. <br /> Harlin Knoll of the San Joaquin County Public Health Services <br /> (SJCPHS) was present during grouting of the wells. <br /> DISTRIBUTION <br /> A copy of this report should be submitted to the SJCPHS, and to the <br /> Regional Water Quality Control Board, Central Valley Region. <br /> 2401 Stanwell Drive,Suite 4 0 <br /> i <br /> Concord,California 9452 <br /> Tel;510.602.5100 Fac:510.6870602 <br />