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2.3 Pipeline Solution Descriptions <br />As described in Section 2.2, above, both pipelines will be of similar construction <br />and design. Although the solutions in the iwo project pipelines will contain <br />similar constituents, the fluids will have very different concentrations. The <br />product pipeline will carry the more concentrated of the two solutions. Pertinent <br />operating characteristics of the Yankee Gulch Project pipelines are indicated in <br />Table 2-1 below. <br />Table 2-1 Pipeline Operating Chazacteristics. <br />Pazameter .Product Line Return Water Line <br /> IN OUT IN OUT <br />Temperature <br />(degrees F) 203 183 158 144 <br />Flow Rate <br />($pm) 1549 1549 1735 1735 <br />Pressure (psi) 1400 1216 1875 291 <br />(Source: Williams Energy Services, 1999.) <br />The temperature differences within the product pipeline and the return water <br />pipeline indicated above were modeled based on the pipeline input parameters, <br />the insulative values of the pipeline, and the characteristics of the surrounding <br />environment. An ambient average m;n;mum ground temperature of 10 degrees <br />F was used in the model. Based on these values and the solubility characteristics <br />of the fluid, the product line would remain operable for a minimum of 101 <br />hours (just over 4 days) before plugging of the line could potentially occur. The <br />return water line has a much lower concentration, and, therefore, line plugging <br />is not a concern. <br />2.4 Pipeline Specifications <br />Both pipes (product line and return water line) will be placed in a single trench <br />over most of the pipeline corridor. Exceptions to this may occur at road crossings <br />where boring is required and in areas of significant rock where two trenches may <br />be required because of difficulties in trench excavation. The pipeline trench will <br />be 72 to 80 inches wide and 54 to 60 inches deep. The minimum burial depth for <br />the mainline pipes will be 30 inches from the top of pipe, which is in accordance <br />with 49 CFR Part 195. The two pipes will be spaced 24 inches apart. There will <br />generally be 6 inches of bedding under the pipe and 30 to 36 inches of soil above <br />the pipe, dependingori the presence of rock substrate. At perennial stream <br />Pipeline Plan of Development 7 <br />Yankee Gulch Sodium Mataal~ Project <br />Ameriom Soda, LLP. <br />