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GROUP <br /> 302 Pendleton Way <br /> Oakland,CA 94621 <br /> License No.724938 <br /> September 21, 2009 <br /> Ms. Anne P. Conner <br /> Senior Remediation Project Manager <br /> PG&E Environmental Remediation <br /> 3401 Crow Canyon Road, Room 176C <br /> San Ramon, CA 94583 <br /> Subject: Well Decommissioning and Site Closure Report <br /> PG&E McDonald Island, California <br /> Dear Ms. Conner, <br /> On behalf of Pacific Gas and Electric Company(PG&E), MSE Group(MSE) is pleased to <br /> present this report summarizing closure activities implemented at the McDonald Island Gas <br /> Storage Facility located near Stockton, California(the site). Closure activities were initiated <br /> on April 24, 2009, when the California Regional Water Quality Control Board—Central <br /> Valley Region(CVRWQCB) rescinded Waste Discharge Requirements Order No. 96-176 <br /> (WDR) for the site. Closure activities will conclude with submittal of this report to the San <br /> Joaquin County Environmental Health Department (SJCEHD) and CVRWQCB on September <br /> 22, 2009. <br /> INTRODUCTION <br /> On January 30, 2009, PG&E submitted the 2008 Annual Groundwater Monitoring Report <br /> (MSE, 2009a) for the site to CVRWQCB. In summary, the evaluation of 2008 semiannual <br /> monitoring data presented in the report continued to confirm conclusions throughout reports <br /> produced in 2007 and 2008 that it is naturally occurring geochemical processes and irrigation <br /> operations on McDonald Island that affect groundwater concentrations of constituents of <br /> concern (COCs) listed in the WDR. In conjunction with the conclusion that contamination by <br /> COCs is not currently found within the Pond 3 footprint soil' or subsurface water, PG&E <br /> continued to strongly support the previous recommendation for termination of the corrective <br /> action program detailed in the WDR and rescission of the WDR. <br /> 1 Pond 3 was the Class II surface impoundment where materials were disposed that were associated with natural <br /> gas well drilling and production byproducts. Pond 3 was clean closed in 1994 by excavation and offsite disposal <br /> of 20,000 cubic yards of disposal material and native soil from within and below the pond. <br />