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SECTION 4.0 <br /> Natural Gas Supply <br /> The Lodi Energy Center (LEC) will require construction of a new offsite pipeline to supply <br /> natural gas to the project site. Pacific Gas and Electric Company (PG&E) operates a high- <br /> pressure natural gas pipeline (#108) in a utility easement approximately 2.5 miles east of the <br /> site at the northwest intersection of the Western Pacific Railroad and Armstrong Road. The <br /> proposed natural gas pipeline would be parallel to the existing 3-mile pipeline that serves <br /> the existing Northern California Power Agency (NCPA) Combustion Turbine Project#2 <br /> (STIG plant),which is next to the proposed LEC site. The existing gas pipeline exits the STIG <br /> plant approximately 400 feet south of the White Sough gas metering station and then turns <br /> east for approximately 1,600 feet (0.3 mile) along the access road to the City of Lodi s White <br /> Slough Water Pollution Control Facility (WPCF) and under Interstate 5 (I-5). The pipeline <br /> continues east from I-5, along a utility easement for approximately 8,400 feet (1.6 miles), <br /> bordering several private agricultural fields until the intersection of De Vries Road and <br /> Armstrong Road. The pipeline then continues in an easement adjacent to the north side of <br /> Armstrong Road for approximately 3,000 feet (0.6 mile) to PG&E's high-pressure natural gas <br /> pipeline #108. The entire length of the gas pipeline is approximately 13,400 feet, or 2.5 miles, <br /> as shown in Figure 1.1-3. The pipe connecting the LEC site with the PG&E pipeline will be <br /> 12 inches in diameter. Construction primarily will be the open-trench method with a <br /> construction corridor of 50 feet or less. No other alternative routes were evaluated because <br /> this route is the only direct route that could use existing rights-of-way and utility easements. <br /> The pipeline will be constructed of alloyed carbon steel in accordance with the American <br /> Petroleum Institute (API) specification for gas pipeline. The pipe will have factory-applied <br /> corrosion-protection coating.Joints will be welded,inspected using x-ray,and wrapped <br /> with a corrosion-protection coating. <br /> 4.1 Construction <br /> The construction of the natural gas pipeline will consist of the following components: <br /> 1. Trenching width depends on the type of soils encountered and requirements of the <br /> governing agencies. The optimal trench will be approximately 24 inches wide and <br /> 48 inches deep. If loose soil is encountered,a trench up to 8 feet wide at the top and <br /> 2 feet wide at the bottom may be required. The pipeline will be buried to provide a <br /> minimum cover of 36 inches. The excavated soil will be piled on one side of the trench <br /> and used for backfilling after the pipe is installed.The pipeline will be installed through <br /> trenching at all locations except where boring or directional drilling is required to pass <br /> beneath other buried utilities. <br /> 2. Stringing consists of trucking lengths of pipe to the right-of-way and laying them on <br /> wooden skids beside the open trench. <br /> 3. Installation consists of bending,welding,and coating the weld-joint areas of the pipe <br /> after it has been strung,padding the ditch with sand or fine spoil, and lowering the <br /> SAC 371322/082330004(LEC_4.0_NATURAL_GAS_SUPPLY.DOC) 4-1 <br />