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Department of Toxic Substances Control <br /> Deborah O. Raphael, Director Edmund G.Brown Jr. <br /> Matthew Rodriquez 8800 Cal Center Drive Governor <br /> Secretary for Sacramento,California 95826-3200 <br /> Environmental Protection <br /> December 6, 2011 <br /> Ms. Patricia Sullivan <br /> Pacific and Gas Electric <br /> Senior Engineer <br /> Environmental Remediation <br /> 3401 Crow Canyon Road <br /> San Ramon, California 94583 <br /> REVISED LIMITED SUBSURFACE INVESTIGATION WORK PLAN, PACIFIC GAS <br /> AND ELECTRIC (PG&E) STOCKTON GAS LOAD CENTER, (FORMER STOCKTON <br /> MANUFACTURED GAS PLANT), 535 CENTER STREET, STOCKTON, CALIFORNIA <br /> Dear Ms. Sullivan: <br /> The California Department of Toxic Substances Control (DTSC) and the Regional Water <br /> Quality Control Board (RWQCB) received the November 23, 2011 response to <br /> comments (Response to Comments)and the revised work plan (Work Plan)to conduct <br /> a limited subsurface investigation for the former PG&E Manufactured Gas Plan (Site) <br /> located at 535 S. Center Street in Stockton, California. DTSC and the RWQCB <br /> reviewed the draft Work Plan and mailed comments to PG&E in letter dated September <br /> 30, 2011. DTSC, the RWQCB, PG&E, and Arcadis (PG&E consultant) participated in a <br /> teleconference call on October 18, 2011 to discuss the September 30, 2011 comment <br /> letter. The revised work plan incorporates the September 30, 2011 comments and <br /> proposes to conduct a limited investigation to assess Polycyiic Aromatic Hydrocarbons <br /> (PAHs), total petroleum hydrocarbons as diesel (TPHd) and gasoline (TPHg) <br /> concentrations in the groundwater and soil. The work plan proposes to install a total of <br /> six monitoring wells, three wells screened from 20-35 feet below the ground surface, <br /> one screened from 70-85 feet below the ground surface, one well screened from <br /> 100— 115 feet below the ground surface, and one well screened from 115 — 130 feet <br /> below the ground surface. The groundwater is approximately 23 feet below the ground <br /> surface. The work plan proposes to collect soil samples in each of the six well's borings <br /> at approximately every 10 feet. Each of the soil samples will be analyzed for PAHs, <br /> TPHg, TPHd, and benzene, toluene, ethylbenzene, and total xylene. The Response to <br /> Comments addresses DTSC and the RWQCB September 30, 2011 comments. PG&E <br /> should implement the workplan within 60 days from receiving this letter. Once the wells <br /> have been installed, developed, and sampled, PG&E should submit a technical report <br /> within 10 weeks following receipt of the final laboratory reports. <br /> ® Printed on Recyded Paper <br />