RMC employs recognized industry experts for all aspects of wastewater planning and design projects—including master planning and modeling, infiltration/inflow analysis, condition assessment, O&M assessment, capital project planning and prioritization, pipeline design, trenchless construction technology, and asset management.

Bridgehead Pump Station and Conveyance System

Delta Diablo Sanitation District

RMC prepared a comprehensive facilities master plan for the Bridgehead Pump Station and Conveyance System, and followed up with design of the Phase 1 and Phase 2 facilities. RMC:

• Designed a 28-inch force main, an 11.75-mgd wastewater pump station, an emergency storage basin, and improvements to the existing submersible pump station for conversion to a diversion pump station
• Designed mechanical, HVAC, electrical, and instrumentation and controls support systems
• Provided construction services, permitting, and CEQA documentation

 

Sanitary Sewer Overflow Elimination Project

Inland Empire Utilities Agency (IEUA)

RMC completed a fast-track evaluation and design of improvements to re-route sewer flows in the event of a power outage. We:

• Evaluated alternatives, using a hydraulic model, for passive overflow protection for a pump station if it went out of service during an emergency
• Identified a way to provide equal protection for an additional pump station
• Designed improvements to protect both facilities for a fraction of the original construction budget
• Designed structural modifications to two existing structures in the trunk system and new piping at the wastewater treatment plant to route flows to existing overflow prevention basins

 

Sewer Master Plan

City of San Jose

Between 2003 and 2004, RMC master-planned the central portion of San Jose—comprised of 185 miles of sewers—as part of a citywide master plan. In 2006 we were selected for the second phase which addresses the remaining areas of the City and updates the Phase I areas to include an expanded sewer network and more focused analysis on priority development areas. RMC:

• Conducted wet weather flow monitoring
• Constructed a dynamic hydraulic model of the central area system
• Developed capacity improvement projects and program
• Conducted extensive training of city staff in use of the model

 

Overflow Reduction Action Plans

Sewerage Agency of Southern Marin (SASM) & Sausalito-Marin City Sanitary District (SMCSD)

RMC is helping two agencies and their member organizations to develop overflow reduction action plans and respond to EPA Compliance Orders. The orders require submittal of 15 separate plans and reports over two years. Peak wet weather flows reaching the wastewater treatment plants can be 10 times average dry weather flows. To address the unique systems, RMC has:

• Conducted extensive flow monitoring
• Provided capacity assessment and modeling
• Conducted condition assessment analysis
• Helped meet all of the EPA compliance order milestones to date
• Helped implement a strategy for addressing wet weather overflow issues in the future

Wet Weather Infrastructure and I/I Studies

East Bay Municipal Utility District

RMC participated in a series of regulatory-driven studies to address wet weather issues in the interceptor system and remote treatment facilities. The District’s interceptor system is made up of over 40 miles of pipelines, including gravity interceptors up to 108 inches in diameter and 14 pump stations. We:

• Conducted hydraulic modeling and analysis of flow monitoring data to quantify flows from the community collection systems
• Evaluated alternatives for increased conveyance and storage capacity and optimizing operational control of diversions and pump stations
• Identified and evaluated options for inflow/infiltration management
• Conducted InfoSWMM model training sessions for agency staff

Collection System Operations and Rehabilitation Assessment

Central Contra Costa Sanitary District

Our practical and implementation-oriented approach quickly results in tangible benefits. For example, since fine tuning their cleaning process based on RMC’s recommendations, the Central Contra Costa Sanitary District, one of the best performing collection system agencies in the state, saw a 26% reduction in sewer system overflows in only one year—about half the time it usually takes to see performance improvement results in collection systems. RMC:

• Conducted an assessment of sewer cleaning operations
• Completed a sewer cleaning effectiveness study
• Identified several areas where the District could improve sewer cleaning operations

Annual Sewer Upgrade Program

City of Milpitas

RMC is assisting agencies statewide with their annual sewer upgrade projects. For the City of Milpitas, we have provided:

• CCTV inspection, condition assessment, repair prioritization
• Design for 15 sites using a mix of trenchless pipe-bursting and open cut
• 17-foot deep trenchless design under a levee
• 250-foot pipe burst design of 6” VCP burst to 8”

Interstate 80 Crossing at Denton Court

Vallejo Sanitation and Flood Control District

RMC designed the sewer crossing under I-80 at Denton Court, a project in the Vallejo Sanitation and Flood Control District’s capital improvement program selected for immediate implementation. RMC:

• Designed using a combination of construction methods, including guided auger boring, pipe bursting, and pipe reaming
• Designed the challenging sewer crossing under I-80
• Designed a sewer upsizing across a mobile home park
• Prepared the engineer’s cost estimate, conducted utility research, and led obtainment of the encroachment permit from Caltrans