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Page 2 of 2 <br /> A <br /> TPZ-1 through TPZ-5. The two remaining wells that are known to have been installed by PG&E and that still exist <br /> at the site are CSD-1 and WSD-1, which supply non-potable water to the two compressor stations and will not be <br /> decommissioned. Information on these wells (except for TPZ-1 through -5) is shown in the attached Table 2-1. <br /> MSE was able to locate boring logs and well diagrams only for MW-10 and MW-11, shown in Table 2-1 as having <br /> 2' PVC casings. However, the borehole diameter is not provided on the well diagrams. As I mentioned to you, I <br /> am sure the drillers performing this work met the minimum County (or, previously, District) requirements for a 2" <br /> annular space around the wells, but SOPs for the various consultants that installed these wells could have <br /> specified boreholes to have larger annular spaces. So that the drillers can accurately estimate their time and <br /> materials for the decommissioning project, MSE would appreciate you also searching and providing any <br /> construction records you might have on the following: <br /> • MW-1 RD (representing MW-1 RD through MW-5, installed in 1986) <br /> • MW-6 (representing MW-6 through MW-9, installed in 1989) <br /> • MW-10 (representing MW-10 and MW-11, installed in 2000) 'f 4 m'�' �J t <br /> • P-1 (representing P-1 through P-7, WLs first measured in 1994 but unknown installation dates) <br /> MSE has construction logs for TPZ-1 through TPZ-5. These temporary piezometers were installed by MSE and <br /> inspected by you in December 2007. <br /> Anne Conner, the PG&E PM for the site, is aware that you will bill PG&E directly on a time and materials basis for <br /> the records search. She has moved from the North Wiget Lane address shown on the attached letter to the <br /> following address: <br /> Anne Conner <br /> Senior Remediation Project Manager <br /> PG&E Environmental Remediation <br /> 3401 Crow Canyon Road, Room 176C <br /> San Ramon, CA 94583 <br /> (925)415-6381 <br /> We very much appreciate your prompt provision of the SJCEHD website link, the decommissioning schematic, <br /> and any relevant records you can find on the above wells. Once we receive these materials we will finalize the <br /> RFB, receive and evaluate drillers' bids, obtain authorization to proceed from PG&E, and then submit the well <br /> permit application to you. Please contact me if you have any questions or need additional information. <br /> Thank you, <br /> Robert A. Ellgas, Ph.D. <br /> Program Manager <br /> MSE Group <br /> 302 Pendleton Way <br /> Oakland, CA 94621 <br /> 510-383-9600 <br /> 510-383-9300 fax <br /> 5/29/2009 <br />