City of Mt. Shasta Sewer Line Improvements Project
Roles of Team
CITY OF
Mt. Shasta
CALIFORNIA
City of Mt. Shasta – CEQA Lead Agency
• Point of contact for the public
• Adoption of the EIR under CEQA
• Approval of project
Pace Engineering, Inc. – Engineering Consultant
• Screening of alternatives and construction methodologies
• Project design
North State Resources, Inc.
North State Resources, Inc. – Environmental Consultant
• Completion of supporting technical studies
• Facilitation of public outreach/scoping process
• Preparation of the EIR under direction of the City
CITY OF
Mt. Shasta
CALIFORNIA
City of Mt. Shasta Sewer Line Improvements Project
CEQA Process
The California Environmental
Quality Act
California Environmental Quality Act
(CEQA) – CEQA requires that California state
and local agencies prepare an Environmental
Impact Report (EIR) when they determine the
project may have a significant impact on the
environment
EIR - An EIR is a public document that
provides an assessment of the potential
environmental impacts resulting from a
proposed project and alternatives. Within the
EIR, the potentially affected environmental
setting is identified and resources potentially
impacted are analyzed.
Analysis – Major resource areas to be
evaluated in the EIR include, but are not
limited to:
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Aesthetics
Biological resources
Cultural resources
Groundwater
Land use
Hydrology and water quality
Air quality
Noise
Hazardous materials and hazardous waste
Traffic
Cumulative Impacts
EIR
Public Involvement Opportunities
During the CEQA Process
Notice of Preparation
Attend the Public Scoping Meeting in Mt.
Shasta, CA – November 12, 2014
Scoping
Review and Comment on the Draft EIR –
Summer 2015
Draft EIR
• Availability of the Draft EIR will be
announced in the local newspaper and on
the City’s website
Public and Agency Review
• The 45-day comment period commences
with the availability of the announcement
State Clearinghouse Review
Final EIR
Review of Responses by Commenting
Agencies
Agency Discussion
Findings;
Statement of Overriding Considerations;
Mitigation Monitoring Program
Attend the Public Hearing on Draft EIR –
Fall 2015 – Winter 2015
• Notice of the hearing will be announced
in the local newspaper and on the City’s
website
Attend Public Hearing on the Final EIR
• Notice of the hearing will be announced
in the local newspaper and on the City’s
website
While it is the goal of the project team to meet these
dates, all dates references are tentative and may
be adjusted as circumstances dictate during the EIR
process.
CITY OF
Mt. Shasta
CALIFORNIA
City of Mt. Shasta Water and Wastewater Facility Improvement Project
Key Environmental Issues
Air Quality
• Fugitive dust generated by construction
activities, including vehicle travel over unpaved
roads
• Exhaust emissions from construction
equipment and worker commute and delivery
vehicles
• Contribution to greenhouse gas emissions
(construction and operational)
Cultural Resources
• Sensitivity for historic and prehistoric
resources within the project study area
• Potential for discovery of prehistoric resources
during ground-disturbing activities
Hydrology and Water Quality
• Short-term sedimentation and turbidity within
Cold Creek, a tributary to the Sacramento River,
as a result of erosion during construction
• Excavation activities has the potential to perch
groundwater, which would require dewatering
Wetlands and Biological Resources
• Temporary and permanent effects to
jurisdictional waters and riparian vegetation
• Potential effects on special-status species and
associated habitat
–– Little willow flycatcher
–– Greater sandhill crane
–– Yellow warbler/yellow-breasted chat
–– Cascade frog/foothill yellow-legged frog
–– Alepo avens
Hazards/Hazardous Materials
• Accidental spills from construction equipment
and/or vehicles
• Potential for wild land fire
CITY OF
Mt. Shasta
CALIFORNIA
City of Mt. Shasta Water and Wastewater Facility Improvement Project
Key Environmental Issues
Aesthetics
• Temporary disruption of area view shed due to
presence of construction equipment in open space
areas
• Short-term disturbance to open space areas following
construction and prior to revegetation
Land Use
• Consistency with local land use plans, policies, and
deed restrictions associated with an established
mitigation area
• Temporary conflicts with existing land uses and
during construction
Noise
• Short-term disturbance to adjacent residents during
construction of the proposed sewer line
• Consistency with the City’s local noise policy
Cumulative Impacts
• City’s Wastewater Treatment and Disposal
Feasibility Study to comply with State Mandated
NPDES permit and new ammonia levels
• Relationship to proposed operations at the
Crystal Geyser Bottling Facility
–– Truck traffic along existing local roads
–– Air quality associated with operation/truck
traffic
–– Noise associated with operation/truck traffic
–– Effects of pumping activities on local aquifer
and groundwater levels of local residential
wells
–– Potential changes in effluent quality
associated with discharge of effluent from
the Crystal Geyser Bottling Facility into the
City’s sewer system
CITY OF
Mt. Shasta
CALIFORNIA
City of Mt. Shasta Sewer Line Improvements Project
Proposed Project Layout
Replace sanitary sewer in place
in same easement (open cut)
(east)
Sanitary sewer to be
abandoned (east)
Sanitary sewer (open cut)
north
Potential construction
staging area
Sanitary sewer trenchless
Potential access road
Replace sanitary sewer in same
easement (open cut) (east)
CITY OF
Mt. Shasta
CALIFORNIA
City of Mt. Shasta Sewer Line Improvements Project
Alternative 1
CITY OF
Mt. Shasta
CALIFORNIA
• Alternative 1 would replace the majority of existing
interceptor within existing easements, including
the portion across the wetlands parcel.
• Alternative 1 would have the greatest impact to
wetlands because open-cut trenching would need
to occur within the wetlands (Photo 1A). Some
of the impact could be mitigated by using trackmounted equipment and temporary road mats
in travel areas. However, due to the status of the
parcel having conservation easement restrictions,
Alternative 1 may not be possible to permit and
construct.
• The wet, unstable soil through the wetlands
would be difficult to brace and shore for keeping
construction workers safe (Photo 1B).
Replace sanitary sewer in same
easement (open cut) (east)
Bore and jack sanitary
sewer (north)
Replace sanitary sewer in same
easement (open cut) (east)
Replace sanitary sewer in same
easement (open cut) (east)
Potential construction
staging area
Potential access road
• The portion of interceptor south of South Old
Stage Road would be replaced using open-cut,
excluding the portion south of Ream Avenue,
which would utilize Horizontal Directional
Drilling (HDD) due to the large culvert conveying
the unnamed drainage tributary to Cold Creek.
There may be a couple of additional reaches
crossing wetlands that we may utilize HDD
(Photos 1C and 1D).
Photo Alternative 1A
Typical open-cut trench installation
Photo Alternative 1B
Open-cut sewer installation inside a shoring shield,
under normal trenching conditions
Alternative 1
Photo Alternative 1C
Typical open-cut sewer installation using excavators
and shoring shield
Photo Alternative 1D
Typical open-cut sewer installation using
excavators and shoring shield
CITY OF
City of Mt. Shasta Sewer Line Improvements Project
Mt. Shasta
CALIFORNIA
Alternative 2
• Alternative 2 would utilize HDD to replace the portion
of the interceptor across the wetlands parcel. This
approach would significantly reduce the impacts
to existing wetlands because HDD is a “trenchless”
installation technique (Photo 2A and 2B).
• The HDD process, particularly with the diameter and
lengths being considered, requires a relatively straight
alignment between drilling and receiving pits. This
makes pulling the new pipeline back through the drilled
hole easier. As such, it will be necessary to establish a
new alignment across the wetlands parcel.
• It will be necessary to install one manhole near the
center of the HDD pipeline, which will require vehicular
access across the property through wetlands. Thus,
there will be some impacts that will be mitigated by
using temporary road swamp mats when traversing
across wetlands to the upland area near the proposed
manhole (Photo 2C).
Replace sanitary sewer in place in
same easement (open cut) (east)
Sanitary sewer to be
abandoned (east)
Sanitary sewer (open cut) (north)
Potential construction
staging area
Sanitary sewer (trenchless)
(north)
Replace sanitary sewer in
easement (open cut) (east)
Potential access road
• It will be necessary to obtain new easements from
the property owner and “quit-claim” back existing
easements.
• The portion of interceptor south of South Old Stage
Road will be constructed similar to Alternative 1.
Photo Alternative 2A
Typical HDD installation showing the pipe pull
Alternative 2
Photo Alternative 2B
Typical HDD installation showing the drill rig
(note: HDD pipe shown is smaller than what is being
proposed for this project)
Photo Alternative 2C
Example of temporary road swamp map
CITY OF
City of Mt. Shasta Sewer Line Improvements Project
Mt. Shasta
CALIFORNIA
Alternative 3
• Alternative 3 eliminates the need to replace a
large portion of interceptor across the wetlands
parcel by installing a new sewage lift station
near the intersection of West Jessie Street and
Hatchery Lane near the I-5 interchange (Photo
3A).
• A pressurized raw sewage force main would be
constructed west along Hatchery Lane, and then
south along South Old Stage Road, discharging to
a manhole in South Old Stage Road.
• Since the City has no other raw sewage lift
stations in its collection system, a new lift station
presents operational and maintenance challenges
for City staff. This would increase on-going O&M
costs for the City.
Replace sanitary sewer in place in
same easement (open cut) (east)
Sanitary sewer to
be abandoned
Sanitary sewer (open cut) (north)
Sanitary sewer lift station
(north)
Replace sanitary sewer in same
easement (open cut) (east)
Sanitary sewer force main
(open cut) (north)
• The lift station would increase electrical power
consumption and lead to increased O&M costs.
• The portion of interceptor south of South
Old Stage Road will be constructed similar to
Alternative 1.
Alternative 3
Photo Alternative 3A
Typical submersible-type sewage lift station
CITY OF
City of Mt. Shasta Sewer Line Improvements Project
Mt. Shasta
CALIFORNIA
Alternative 4
• Alternative 4 is similar to Alternative 3
in that constructing a new interceptor
across the wetlands parcel is eliminated.
The alternative consists of constructing a
gravity sewer west along Hatchery Lane,
then south along South Old Stage Road to
the current alignment.
• Due to the increase in length between West
Jessie/Hatchery Lane and the existing
alignment on South Old Stage Road, a
new gravity interceptor would be much
deeper (by approximately 20 feet) than
the existing pipeline. This will require
deepening the downstream interceptor for
a considerable distance, leading to higher
costs.
Replace sanitary sewer in
place in same easement
(open cut) (east)
Sanitary sewer (open cut) (north)
Sanitary sewer
(open cut) (north)
Replace sanitary sewer in
same easement
(open cut) (east)
• Portions of the new interceptor along
South Old Stage Road would be about
20 feet deep, which is difficult and very
expensive to construct. Future O&M is also
challenging.
• The portion of interceptor south of South
Old Stage Road will be constructed similar
to Alternative 1, except a significant
portion would be much deeper to account
for the longer upstream alignment.
Alternative 4
CITY OF
City of Mt. Shasta Sewer Line Improvements Project
Mt. Shasta
CALIFORNIA
Alternative 5
• Alternative 5 eliminates the need to
install a new interceptor across the
wetlands property, except that a small
diameter pipeline would be pushed
through the existing interceptor pipe in
order to serve the existing services on
West Jessie Street, west of Interstate 5.
• A new gravity interceptor would be
installed along the east boundary of
the Interstate 5 interchange, across
West Lake Street to the existing sewer
alignment that traverses around the
north and south sides of the Tree house
Inn. It would be necessary to use a
trenchless installation under West Lake
Street and Interstate 5.
Replace sanitary
sewer in
(open cut) (east)
Bore & jack sanitary
sewer (north)
Replace sanitary sewer
(open cut) (east)
Bore & jack sanitary
sewer (north)
Sanitary sewer (open cut) (north)
HDPE gravity sanitary sewer
(north) inside sanitary sewer
(east)
Replace sanitary sewer in
same easement (open cut)
(east)
• The trenchless installations could be
HDD or Bore and Jack (Photo 5A).
• New easements will be required for much
of this new alignment, and there would
be impacts to existing wetlands on the
east side of the Interstate 5 interchange.
• A Caltrans encroachment permit would
be required for boring under Interstate 5.
Alternative 5
• The portion of interceptor south of South
Old Stage Road will be constructed
similar to Alternative 1.
Photo Alternative 5A
Typical bore and jack process used on
Mt. Shasta’s 2007 Interceptor Replacement Project