4. A 24-in sanitary sewer, 8,000 ft long, carries raw sewage to the city's wastewater treatment plant. The pipe is 45 ye

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4 A 24 In Sanitary Sewer 8 000 Ft Long Carries Raw Sewage To The City S Wastewater Treatment Plant The Pipe Is 45 Ye 1 (30.06 KiB) Viewed 18 times

4. A 24-in sanitary sewer, 8,000 ft long, carries raw sewage to the city's wastewater treatment plant. The pipe is 45 years old and is made of concrete. There are 9 manholes on the way and no laterals. In recent years, there have been approximately five failures per year costing the city approximately $25,000 for each emergency repair and bypassing the raw sewage. The top of the pipe on average is 10 ft deep from the ground surface and water table is assumed to be 4 ft deep. Although the pipe location is out of the city limits, it is adjacent to the railroad tracks that make the open-cut replacement option impractical. The city has employed you to select the best method to renew this sewer (include installing a new line within your options). Assume 1,000 ft of the pipe will be renewed at one time. Include justifications for eliminating or selecting each option (35 Points).