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i <br /> i CH2M HILL <br /> 1111 Broadway <br /> P.O.Box 12681 <br /> CH2MHILL Oakland,CA <br /> 94604-2681 <br /> Tel 510.251.2426 <br /> May 11, 1999 Fax 510.893.8205 <br /> 114348.RD.ZZ <br /> Mr.Jeff Wong,REHS <br /> San Joaquin County Public Health <br /> Environmental Health Division <br /> 304 East Weber Ave., 3d Floor <br /> Stockton,CA 95202 <br /> Subject: Work Plan for Well Destruction <br /> Pacific Gas and Electric Company Maintenance Yard—Former MGP Site <br /> 535 South Center Street, Stockton <br /> Dear Mr. Wong: <br /> CH2M HILL Constructors, Inc. (CCI) has submitted an application with San Joaquin County Public <br /> Health, Environmental Health Division (County) for the destruction of four monitoring wells at the <br /> Pacific Gas and Electric Company (PG&E) maintenance yard. The destruction of the wells is being <br /> performed to allow for remediation activities to be performed at the facility under the regulatory <br /> direction of the California Environmental Protection Agency, Department of Toxic Substances <br /> Control (DTSC). As requested by the County, this letter presents our work plan for destruction of the <br /> monitoring wells. <br /> Well completion logs for the four monitoring wells to be destroyed are attached. As shown on the <br /> logs, two of the monitoring wells were constructed with 10-inch diameter steel conductor casing <br /> (MW-6 and MW-9). These two wells will be destroyed by tremie grouting with neat cement from the <br /> bottom of well to surface. The two wells constructed without steel conductor casing (MW-10 and <br /> MW-19) will be destroyed by over-drilling the wells to the depth of the top of the stainless steel well <br /> screen and tremie grouting from the screen zone to surface while removing the auger. The drilling <br /> company that will perform the well destructions is Spectrum Drilling of Stockton, California. <br /> Spectrum Drilling plans to use a CME-75 flight-auger rig for the over-drilling. Drill cuttings will be <br /> managed with excavated soil under the DTSC remediation activities which are to commence in June. <br /> The well destructions are planned for June 1 through 3, 1999. <br /> Thank you for your assistance expediting the application and scheduling process. Please contact me <br /> at(510)251-1888 x2170 if you have any questions regarding this work plan. <br /> Sincerely, <br /> H2M HII L Constructors, Inc. <br /> avid P. o le, E. <br /> Project Manager <br /> c: Patricia Sullivan, Pacific Gas and Electric Co. <br /> Paula Bolio,CH2M HILL <br /> Dale Hemstad,CH2M HILL Constructors,Inc. <br /> CAB`, PSTOCKTONU_ GRSVWONG_51 LDDC <br />