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Pacific Gas and Electric Company Environmental Services <br /> P0.Box 7640 <br /> San Francisco,CA 94120 <br /> 415/973-7000 <br /> July 28, 1992 Direct Dial 415/973- <br /> Telecopy415/973-9201 `'� <br /> Ll"Mr. ti 1 r <br /> AUG 0 3 1992 <br /> CaliforniaVal F. Siebal ENVIRONMENTAL HEALTH <br /> CalEnvironmental Protection Agency PERMIT/SERVICES <br /> Department of Toxic Substances Control <br /> 10151 Croydon Way <br /> Sacramento, CA 95827 <br /> Attention: Mr. Fernando Amador <br /> Dear Mr. Siebal : <br /> Re: Docket #HSA 90/91-08 - Stockton Manufactured Gas Plant Site <br /> Subject: Completion of IRM on Hazelton Avenue <br /> PG&E has completed construction of the portland cement cap located on <br /> the northern embankment of Hazelton Avenue south of the former gas plant <br /> site and Station A Substation. The Department approved this cement cap <br /> as an Interim Remedial Measure (IRM) by letter of February 14, 1992. <br /> The attached figure shows the extent of the cement cap constructed. A <br /> summary of the construction activities follows. Work was conducted by <br /> PG&E health and safety certified engineering and construction personnel <br /> and permitted by the City of Stockton. Construction was completed on <br /> schedule, beginning April 28 and ending June 1, 1992. Traffic and dust <br /> control were maintained throughout the project. All construction was <br /> consistent with the pre-construction specifications and design, with one <br /> revision to Detail Section 3 as shown in the attached figure. <br /> Prior to construction, existing concrete riprap and vegetation was <br /> removed from the embankment. The slope was graded to a flat uniform <br /> slope with drainage as specified in the plan. Approximately 560 cubic <br /> yards of cement conforming to Caltrans Class B was placed in wood forms <br /> using a roller screed. The completed pad was a minimum of four inches <br /> thick and reinforced with 6-inch by 6-inch welded wire fabric. <br /> Expansion joints on 10 foot centers were filled with premolded expansion <br /> joint filler. Imported material was used as fill around utility poles. <br /> Please let me know if you would like any addition detail regarding this <br /> project. You can reach me at (415) 973-1116. <br /> Sincerely, <br /> Yvonne J. Meeks, R.G. , C.E.G. <br /> Manufactured Gas Plant Project <br />