- Project Dates: JUN 2013 - JUN 2014
- Contract Amount: $104,108
- Planning / Civil Engineering
SBCC was contracted by the Clark County Water Reclamation District (CCWRD) to prepare an engineering feasibility and predesign report for two critical facilities. First, the cross-town interceptor flowing into the headworks of the East Flamingo Water Resource Center is flowing full with surcharge conditions where the 84-inch Reinforced Concrete Pipe (RCP) line flows into a 69-inch RCP. Second, surge ponds within the wastewater treatment complex do not currently have a designated emergency overflow. SBCC evaluated the two areas of concern, developed solutions to correct the identified problems, and prepared a preliminary design report for moving the solutions forward. The provided work scope included the following task items:
Task 1: Surcharge Elimination
Evaluate options to eliminate surcharge conditions and provide headspace within the 84-inch and 69-inch lines for airflow and improved hydraulics. SBCC completed Level D Subsurface Utility Engineering (SUE) services in support of the feasibility analysis of improvements to the cross town sewer interceptor. SBCC gathered as-built information on the existing utilities, and utilized the information in the subsequent analysis. SBCC evaluated and prepared a predesign report for a 115 million gallon per day (mgd) lift station (320 mgd peak) as an alternative (at locations both within the treatment Facility boundary and outside the Facility boundary), which included the following options:
- Replacing the existing pipeline with an elevated 84-inch diameter sewer along the same alignment (estimated construction costs exceed $30 million);
- Add a 115 million gallon per day (mgd) lift station at the treatment facility (estimated construction costs exceed $100 million);
- Combine these two options (estimated construction cost exceeds $130 million).
Task 2: Emergency Overflow
Evaluated overflow conditions and prepared a preliminary design for emergency overflow while protecting a nearby electrical duct bank. SBCC produced a final report that evaluated the configuration options, identified design criteria, provided a planning level cost estimate, and included the following options:
- Add an overflow channel from the existing ponds to discharge to the Flamingo Wash(estimated construction costs exceed $5 million);
- Improve the existing Monson Channel and add an overflow (estimated construction costs exceeds $10 million);
- Add additional 80 million gallons of storage in a new pond (estimated construction cost exceeds $30 million).