City of Salinas
Draft Sanitary Sewer Master Plan Update (SSMPU)
Prepared by Wallace Group
Kari Wagner, PE Principal/Director of Water Resources
Andrea Kingsbury, PE Civil Engineer
Presentation Overview
Master Plan Objectives
Study Area
Flow Monitoring
Existing & Future Sewer Flows
Sewer Model Overview & Results
Capital Improvement Program
Next Steps
SSMPU Objectives
Comprehensive Update to City’s 2011 Sewer Master Plan
Provide City with working, living, functional document to use for budgets, schedule improvement, and plan for the future
Calibrated Sewer Model
Prioritized Capital Improvement Program (existing and future conditions)
SSMPU Study Area
Existing Service Area
Future Growth Areas
Target Areas
Bolsa Knolls
Flow Monitoring
Velocity, level, and direction of
flow
18 monitoring locations
45 days
Insignificant rainfall to determine
Inflow and Infiltration
Existing Sewer Flows
Flow factors based on land use type and population
Water Use Data
Flow Monitoring Sewersheds
Densification per 2020 Census Tract data
Sewer Collection
System Model
Main Trunk Sewer (10‐inch and larger)
Wallace Group surveyed 689 manholes
Manhole Rim and Condition; Pipe Invert and Diameter
As‐built record drawings
11 City Lift Stations
Flow Scenarios (Existing & Future)
Average Daily Flow
Max Day, Dry Weather Flow
Peaking Factor=1.5
Peak Hour Wet Weather Flow
Rainfall Dependent Infiltration and Inflow Rates
Existing: 1,200‐3,000 gallons/acre/day
Future: 500 gallons/acre/day
Existing System
Deficiencies
Future System
Deficiencies
Future Flow Total= 17,715,200 gallons per day
Flow factors applied to future land use
Future flow assumptions
Based on most probable connections
Assume gravity flow, no lift stations (except Ag‐
Industrial Center)
Based on projected land use, per the General Plan
Modeling should be performed during planning
and design phases for future developments if
different than the assumptions made in the
SSMPU
Salinas SSMPU
Capital Improvement Program
Existing CIPs
Implementation of existing CIPs to be
completed over the next 1‐7 years
Hydraulic Deficiencies and O&M Repairs
Lift Station Upgrades
Future CIPs
Implementation of future CIPs to be
completed as development comes on‐line
Identified based on impact of future
developments
Capital
Improvement
Program (Existing)
Existing CIPs ($90‐$120 million)
Six (6) projects identified as
hydraulic deficiencies
Twenty‐one (21) O&M Repairs
CCTV Program
Inflow/Infiltration Evaluation
Brick Manhole and Flushing Inlet
Inspection/Replacement
Includes over $30 million in lift
station upgrades
Capital
Improvement
Program
(Existing Lift Station)
Lift Station Evaluation performed
by Fluid Resource Management
(FRM)
Lift Station CIPs
Lake Street Lift Station pumping
capacity is undersized to meet
existing peak flows
Several site upgrades needed at all
lift stations
Capital
Improvement
Program (Future)
Future CIPs ($48.5 million)
Nine (9) projects identified as
hydraulic deficiencies
Driven by future development and
growth areas
Next Steps
Finalize Sanitary Sewer Master Plan Update Report
Development Impact Fee Nexus Study and Sanitary Sewer Rate Study Thank You
Questions?