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2011 Water and Sewer Master Plan Updates

City of Arroyo Grande

The City of Arroyo Grande hired WSC to prepare the 2011 Water and Sewer Master Plan Updates for the City. WSC updated the water system and sewer system GIS mapping using record drawings and information provided by City staff.  WSC created a WaterGEMS® hydraulic model for the water distribution system and a SewerGEMS® hydraulic model of the collection system from updated GIS mapping. WSC spatially allocated water demands using customer record data and developed updated land use water demand factors to project water demands through buildout. Using sewer duty factors and flow monitoring data, WSC developed sewer loading for the sewer model for both current and buildout scenarios. WSC utilized the water and sewer hydraulic models to perform a capacity-based assessment of the City’s water distribution system and the City’s wastewater collection system.  WSC also analyzed production, storage, and supply redundancy of the City’s water system.

WSC developed a prioritized, risk-based Capital Improvement Plan, which recommends over 18,000 LF of water main replacement, including a creek crossing and several Highway 101 crossings, as well as other facility projects including a new water storage reservoir.  The CIP projects for the sewer system include over 10,000 LF of trenchless sewer rehabilitation, replacement of 3000 LF of forcemain, and additional sewer upgrades and manhole rehabilitation.

As part of the project, WSC performed a detailed site evaluation of the City’s five lift stations, a capacity evaluation of the lift stations, and a quantitative well condition assessment. WSC identified capital improvement projects based on the findings, which were included in the CIP.

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