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ARCADIS <br /> ARCADIS U.S.,Inc. <br /> 2999 Oak Road <br /> Suite 300 <br /> Walnut Creek <br /> California 94597 <br /> Mr. Robert M. Gray Tel 925.274.1100 <br /> Pacific Gas& Electric <br /> Fax 925.274.1103 <br /> Environmental Services <br /> 3401 Crow Canyon Road www.arcadis-us.cus.com <br /> San Ramon, CA 94583 <br /> Subject: <br /> Groundwater Monitoring Well Installation and Sampling Work Plan Addendum <br /> McDonald Island Compressor Station <br /> C-51 Tank Site <br /> Holt, California <br /> Date: <br /> Dear Mr. Gray: February 21, 2013 <br /> As discussed with the Regional Water Quality Control Board, Central Valley Region, Contact: <br /> ARCADIS U.S., Inc. (ARCADIS) has revised the proposed monitoring well locations Allison Greenly <br /> for the C-51 Tank Site at the Pacific Gas and Electric Company(PG&E) McDonald Phone: <br /> Island Compressor Station located in Holt, California. The enclosed figures present 925.296.7836 <br /> the revised locations and are provided as an addendum to the Groundwater <br /> Monitoring Well Installation and Sampling Work Plan submitted in November 2012. Email: <br /> e <br /> n.Grenly <br /> The proposed locations are contingent on PG&E compressor station staff approval Alliso@arcn.Gre my <br /> and may be adjusted in the field due to potential conflicts with above/underground <br /> utilities. <br /> If you have any questions or comments, please contact me by phone at <br /> 925.296.7836 or by e-mail at Allison.Greenly@arcadis-us.com. <br /> Sincerely, <br /> ARCADIS U.S., Inc. <br /> oh�(M a-"r <br /> Allison Greenly <br /> Project Manager <br /> Enclosures: <br /> Figure 3 Previous Sampling and Excavation Locations <br /> Figure 4 Proposed Monitoring Well Locations <br />