Regulatory Support


Sewer Planning Support, Hydraulic Model and Master Plan Update
City of Richmond, California

West Yost developed City-wide flow monitoring programs for two consecutive wet weather seasons in order to quantify I/I and provide data for hydraulic model calibration. The master plan was designed to address aggressive deadlines for infiltration and inflow (I/I) and sanitary sewer overflow reduction that are required to meet a settlement agreement with San Francisco Baykeeper. West Yost also developed an innovative flow monitoring program in order to identify and quantify tidally-influenced I/I that collection system operators suspected was occurring.


Wet Weather Alternatives Analysis
City of Millbrae, California

Faced with tight deadlines under a Baykeeper consent decree to complete multiple capacity upgrades, West Yost helped the City evaluate its options for implementing a long-term plan to reduce infiltration and inflow (I/I) through collection system rehabilitation and private lateral programs. The analysis included identifying and prioritizing subbasins within the collection system with the largest I/I levels by analyzing flow monitoring data and hydraulic model calibration results.


Wastewater Collection System Asset Management Plan and Master Plan Update
Castro Valley Sanitary District, California

As consulting District Engineer, West Yost developed a gravity sewer Asset Management Program, and is currently conducting wet weather flow monitoring for use in recalibrating the District’s existing hydraulic model. Key components of this work included:


Collection System Regulatory Compliance
City of Sausalito, California

West Yost has assisted the City in its timely response to findings from an EPA Clean Water Act compliance evaluation inspection, and the ensuing Order for Compliance issued by the EPA. This included preparing the Regional Water Quality Control Board (RWQCB) annual reports, Sewer System Management Plan (SSMP) audits, system condition assessments, State Revolving Fund (SRF) funding support, and development of a District-wide capital improvement program (CIP). Subsequently, an updated master plan was prepared, which identified over $200 million in upgrades and trunk sewer extensions into growth areas, and West Yost has provided design services on the highest priority projects including pipeline and pump station rehabilitation and replacement.


District Engineering and Collection System Management
West Bay Sanitary District (WBSD), California

West Yost has provided interim District Manager services to WBSD for over two years. During this time, a number of critical sewer management and regulatory compliance projects have been completed, including: a Sewer System Management Plan (SSMP); Regional Water Quality Control Board (RWQCB) annual reports; SSMP audits; system condition rating of pipes; development of prioritized capital improvement program (CIP); maintenance planning support and CMMS optimization; and State Revolving Fund (SRF) funding support.


Sewer Planning
Veolia Water / City of Richmond, California

West Yost is providing as needed sewer planning support to Veolia Water, the contract water, wastewater, and stormwater system operator for the City.

The City’s settlement agreement with a prominent environmental group requires infiltration and inflow (I&I) reductions and system improvements similar to those required by an EPA order.

West Yost’s work in support of this settlement has included; a Sewer System Management Plan; development of prioritized capital improvement program (CIP); State Revolving Fund (SRF) funding support; maintenance planning support; hydraulic modeling; and master planning support.


Sewer System Assessment Planning and Design
Placer County, California

West Yost completed three separate but related projects for Placer County (County) within the Auburn Ravine Basin, including a Sewer System Condition Assessment, Collection System Recommended Improvement Plan, and the Auburn Ravine Basin Hydraulic Capacity Assessment. Timing for each project was critical since the County Redevelopment Agency’s North Auburn Commercial Infrastructure Development Program was providing partial funding for these projects under a challenging timetable.