Myriad Engineering provided design services for the replacement of sewer and water mains, laterals, and meters in the Old Town area of Healdsburg. A topographic survey was completed by our subconsultants and used along with utility mapping to develop an alignment that provided required clearances between utilities, was constructable, and minimized impact to the residents. The result of replacing the aging water mains is an increased fire flow and reduced maintenance and repair costs. The result of replacing the deteriorated sewer mains and laterals is a reduction in inflow, infiltration, and maintenance costs.
Approximately 2,625 LF of cast iron water main will be replaced with an 8-inch diameter PVC water main along with approximately 69 water service laterals, water meters, and hydrants. The project also includes replacing approximately 2,205 LF of sewer main, associated manholes, and 55 sewer service laterals.
Myriad Engineering prepared both plan and profile drawings that provide the contractor with detailed guide on alignment, utility conflicts and crossing details, and relocation of water services and sewer laterals. The sewer design required a change in flow direction and hydraulic analysis to ensure minimum velocities for scouring, maintaining minimum cover and maximum depth of less than 20 feet. The water main design required coordination to maintain a minimum depth and minimum separations between sewer laterals, water services, and gas laterals.
Scope of Services
- Project management
- Sewer and water pipe layout and design
- Coordination of street design, survey, and environmental documentation
- Prepare technical specifications
- Prepare bid package front ends
- Prepare Engineers’ construction estimate