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05/19/99 15:56 $510 893 8205 CH2M HILL 10002 <br /> CH2M HILL <br /> tin eroadway <br /> P.O.Bur 12681 <br /> Oalaand,CA <br /> CH2MHILL 9280,,2581 <br /> TN 510.251 24" <br /> May 13, 1999 rev sto.em ems <br /> Mr.Jeff Wong,RENS <br /> San Joaquin County Public Health <br /> Environmental Health Division <br /> 304 East Weber Ave.,3"Floor <br /> Stockton,CA 95202 <br /> Subject: Revised Work Plan fur 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 revised work plan for <br /> destruction of the 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 pressure grouting with neat cement from <br /> the bottom of well to surface.The two wells constructed without steel conductor casing(MW-10 and <br /> MW-19) will be destroyed by pressure grouting with neat cement from the bottom of well to the <br /> surface.Each well will then be over-drilled to the depth of the top of the stainless steel well screen <br /> (while grout is still wet)and the borehole will be tremie grouted from the top of screen to the surface <br /> while removing the auger. The drilling company that will perform the well destructions is Spectrum <br /> Drilling of Stockton, California. Spectrum Drilling plans to use a ChIF-75 flight-auger rig for the <br /> over-drilling. Drill cuttings will be managed with excavated soil under the DTSC remediation <br /> activities which are to commence in June. The well destructions are planned for June 1 through 3. <br /> 1999. <br /> Thank you for your assistance expediting the application and scheduling process. Please contact me <br /> at(3 10)251-IUS x2170 if you have any questions regarding this work plan. <br /> Sincerely, <br /> H2M HILL Cions-tru�ct_o�rs.Inc. <br /> Dareeld .PX_ <br /> Project Manager <br /> c: Patricia Sullivan.Pacific Gas and Electric Co. <br /> Paula Bolio,CH2M HQ-L <br /> Dale Hernstad,CH?M HILL Constructors,Inc. <br /> CAVO OQ� 0 <br />