© 2016 HDR, Inc., all rights reserved.

Northern California Pipe Users Group Sharing Technologies Seminar – February 21, 2019

Big Changes for a Small Town: The Freeport Septic Conversion Project

Kevin Calderwood Senior Project Manager HDR Folsom, CA

Linda Peters, PE

Associate Civil Engineer Sacramento Area Sewer District Sacramento, CA

Presenters

Provides wastewater collection services to 1.2 million customers in: o Unincorporated Sacramento County o Citrus Heights, Rancho Cordova, Elk Grove o Portions of Folsom and Sacramento

More than 300 wastewater professionals. 105 lift stations; over 4,600 miles of pipeline Conveys wastewater to the Regional San

interceptor system for treatment at the Sacramento Regional Wastewater Treatment Plant near Elk Grove

Sacramento Area Sewer District

Freeport, CA Project Location

13 candidate communities throughout Sacramento County o Many are decades old, do not meet current County and State regulatory requirements o May pose a contamination risk to groundwater and nearby drinking water wells

SWRCB Prop. 1 grant funding available to help communities fund these conversion projects

SASD Septic Conversion Program

Sacramento River community at the western edge of Sacramento County

Established in 1860 2010 Census population of 38 41 parcels, 29 occupied

Freeport, California

Large proportion of retired residents Rely on wells for drinking water and septic

systems for wastewater disposal Many septic systems are decades old River-side lots are small, with inadequate

separation between septic systems and wells

Excellent candidate for septic conversion project

Freeport, California

Five alternatives were identified o Alternative 1 – “Do Nothing” o Alternative 2 – Gravity system o Alternative 3 – Low-Pressure Grinder Pump

System o Alternative 4 – Gravity + Lift Station and Force

Main System o Alternative 5 – “Hybrid” System

Project Design Alternative Evaluation

Alternative 1 – “Do Nothing” o Does not meet project objectives

of eliminating septic systems and protecting water quality

o Eliminated from further consideration

Project Design Alternative Evaluation

Alternative 2 – Gravity System o Infeasible due to length of sewer

required and insufficient depth of available connection point to existing sewer system

o Eliminated from further consideration

Project Design Alternative Evaluation

Alternative 3 – Low-Pressure Grinder Pump System o Determined to be feasible –

included in detailed evaluation o Lower capital costs o O&M costs higher for property

owners, offset partly by elimination of septic maintenance costs

o Lower easement acquisition costs o Simpler permitting

Project Design Alternative Evaluation

Alternative 4 – Gravity Sewer + Lift Station and Force Main System o Determined to be feasible –

included in detailed evaluation o Higher capital and long-term O&M

costs o Higher easement acquisition costs o More challenging permitting

Project Design Alternative Evaluation

Alternative 5 – “Hybrid” System o Determined to be feasible –

included in detailed evaluation o Combination of low-pressure grinder

pump and gravity + lift station systems

o Highest capital costs o Long term operation and

maintenance costs for both District and property owners

o High property acquisition costs o Challenging permitting o “Worst of both worlds” alternative

Project Design Alternative Evaluation

Alternative 3 – Low-Pressure Grinder Pump System identified as preferred alternative

Project Design Alternative Evaluation

Single pump 70 gallon capacity

Up to 700 gpd

Single pump 150 gallon capacity

Up to 1,500 gpd

Dual pump 150 gallon capacity

Up to 3,000 gpd

Quad pump 486 gallon capacity

Up to 7,000 gpd

E-one Low-Pressure Grinder Pump Systems

Grinder pump at each property with a functioning septic tank

1-1/4” pressure laterals Common 2” to 3” force main in

Freeport Blvd. HDD through existing Regional San

easement north of Cosumnes River Blvd.

SASD discharge manhole 8” gravity sewer segment connecting

to existing City of Sacramento manhole

Project Components

Each property requires “back-yard” work o Abandonment of existing septic tank o Installation of grinder pump o Rerouting existing house lateral o Installation of pressure lateral o Sufficient electrical supply

Design Challenges Working on Private Property

Design Challenges Working on Private Property Drawing set contains specific drawings for each

property

o Property owner at northern portion of the project unwilling to grant easement

o Pipeline will be installed within existing Regional San’s easement for their Sacramento Forcemain

o Easement requirements dictate construction methods: • Minimum 6-feet of cover • HDD construction (no open-cut)

Design Challenges Working in Existing Easements

Connection to existing City of Sacramento manhole

Narrow, curved alignment of easement requires open-cut

Design Challenges Working in Existing Easements

o Mature trees • Tree survey completed during design • Protection requirements included in contract

documents o Potential protected species

• Swainson’s Hawk • Burrowing Owl

o Potential cultural/tribal resources o Tree survey completed during design o IS/MND and MMRP prepared by Sacramento

County Planning and Environmental Review

Design Challenges Environmental Issues

Caltrans Encroachment Permit o Freeport Blvd is State Highway 160

Central Valley Flood Control Board o Work in the vicinity of Sacramento River levees

Sacramento County Encroachment Permit o For traffic control needed on Cosumnes River Blvd.

Project Permitting

o Public Meetings • Determine public interest • Review design and demo pump • Upcoming meeting to finalize participation

o Outreach to residents • Postcards and project newsletters • Door-to-door

Public Outreach

Prop 1 Grant Funding: State Water Resources Control Board Small Communities Wastewater Grant Confluence Regional Partnership Program Sacramento County Economic Development Fee Credits Other discretionary funds

Project Funding

Combined funding is expected to make the project cost-free to residential customers

© 2016 HDR, Inc., all rights reserved.

Northern California Pipe Users Group Sharing Technologies Seminar – February 21, 2019

Big Changes for a Small Town: The Freeport Septic Conversion Project

Questions?