HomeMy WebLinkAboutItem 03 Wastewter Master Plan and Stormwater Facility Master Plan Updates
AGENDA ITEM SUMMARY
SPRINGFIELD
Meeting Date:
Meeting Type:
Department:
Staff Contact:
Staff Phone No:
January 14,2008
Work Session
Public Work
S. Smith,
G. Walker
726-3697,736-1035,
726-3674
45 minutes
CITY COUNCIL
ITEM TITLE:
Estimated Time:
WASTEWATER MASTER PLAN AND STORMW A TER FACILITY MASTER
PLAN UPDATES
ACTION
REQUESTED:
ISSUE
STATEMENT:
None. This item is for information only.
The Wastewater Master Plan (WWMP) and Stormwater Facility Master Plan (SWFMP)
projects are nearing completion. Draft plans are under review and capital improvement
projects have been identified. The following information provides a summary of the
master plan projects to date, as well as the timing for their completion.
ATTACHMENTS:
Attachment A: Council Briefing Memorandum
DISCUSSION/
FINANCIAL
IMPACT:
The consultants have submitted the initial drafts of both the Wastewater Master
Plan (WWMP) and the Stormwater Facility Master Plan (SWFMP). The initial
, draft documents provide a summary of the need for these plans, and a description of
the approaches used for preparing the plans. Sections are included describing the
study area characteristics, their impact on the development of the hydrologic and
hydraulic model tools used to identifY problem areas, and develop solutions in the
City's wastewater and stormwater systems. Subsequent sections of the documents
present a draft-prioritized list of proposed capital improvements projects for each of
these systems. The attached Council Briefmg Memorandum provides a more
detailed discussion of the methods used to develop the plans and the results of these
efforts.
The WWMP and SWFMP provide basic data for the City capital improvements
program, SDC methodology development and support for the development
community. Staff is currently reviewing the draft plan documents and is providing
comments to the consultant. As the final documents are being prepared, staff will
initiate appropriate amendments to the Eugene-Springfield Metropolitan Area
General Plan and the Public Facilities and Services Plan (PFSP).
Both master plan projects are within budget and funds for completing the master
plans are included in the fiscal year 2007 - 2008 Public Works budget.
MEMORANDUM
To:
City of Springfield'
From:
Gino Grimaldi, City Manager ?II
Dan Brown, Public Works Directo
Ken Vogeney, City Engineer v<
Matt Stouder, Civil Engineer
George Walker, Stormwater Facilities Planner
January 14,2008
STATUS REPORT ON WASTEWATER MASTER PLAN AND STORMWATER
FACILITY MASTER PLAN UPDATES
COUNCIL
BRIEFING
MEMORANDUM
Date:
Subject:
ISSUE
The Wastewater Master Plan (WWMP) and the Stormwater Facility Master Plan (SWFMP)
projects are nearing completion. The City's consultants for these projects have provided staff
with draft plans that identify recommended preliminary capital improvement projects associated
with each of these public systems. A summary of the work to date, the status of the planning
effort, and a timeline for completion of the plans is presented for each plan for City Council
information.
A. WASTEWATER MASTER PLAN
Background
The wastewater system serving Springfield has two parts: a local collection system (owned by
Springfield) and a regional conveyance and treatment system. The local system is made up of
over 200 miles of pipes and 17 pump stations. The Springfield collection system must be
continually maintained, rehabilitated, and expanded to deliver our community's wastewater to
theMWMC facilities for treatment and discharge to the Willamette River.
The purposed of the WWMP is to identify the City's existing and future wastewater collection
system needs, and projects to satisfy those needs. The plan was developed using a computer
model of the existing system and monitoring data from real storm events in Springfield. By
using actual data gathered from events in our system, the model provides a realistic projection of
the existing and future conditions in our system.
This pran will replace the City's existing and outdated 1980 Sailltary Sewer Master Plan. Initial
work on the current master planning effort startedin 2003, when the City awarded a contract to
CH2M-HiI1. Early in project development, the consultant identified large gaps in City's GIS data
that required additional data gathering and surveying by City staff before model development
could occur. In the last year, under an amended contract, the consultant has built and calibrated a
model ofthe City's wastewater system. The calibrated computer model matches very closely
with actual recorded data from City flow monitors, placed strategically throughout the City's
Attachment A
Page 1 of 4
wastewater system. The calibrated model is the basis for determining deficiencies in the system,
and the foundation upon which subsequent model runs for future planning are based.
Discussion
The initial draft of the WWMP submitted by CH2M-Hill presents the methods and results of
modeling and analysis of the City's wastewater system, as well as recommended capital
improvement projects. This plan provides basic data for the City's capital improvements
program; Systems Development Charge (SDC) methodology and rate development; and support
for the development community.
The draft WWMP includes preliminary recommendations for approximately $65 million (in
2008 dollars) of needed wastewater infrastructure improvements, which staff is currently
reviewing with the consultant. Improvements have been identified in three distinct areas,
including: "expanded" systems that will accommodate future growth inside the City's portion of
the Urban Growth Boundary; conveyance and rehabilitation projects within the City's existing
wastewater system (to address current capacity constraints); and future conveyance and
rehabilitation projects on the existing system (to address capacity constraints associated with
future development and system age).
The draft WWMP identifies seven projects for "expanded" future growth inside the City's
portion of the UGB, which now includes Glenwood. These projects are depicted on Exhibit 1
and include the Jasper trunk sewer extension; McVey Highway sewer extension in Glenwood;
and extensions of the Main St and Thurston Trunk sewers, among others. Collectively, the
estimated cost to design and construct these projects is $28.2 million.
A substantial amount of the needed improvements identified by the consultant is directly related
to predicted deficiencies in the City's existing wastewater collection system. These deficiencies
must be eliminated through rehabilitation in order to avoid future sewage overflow. To eliminate
these deficiencies, the WWMP identifies 16 projects, as depicted on Exhibit 2, in the form of
rehabilitation and conveyance system expansion projects. One of the rehabilitation project areas
was previously identified in the Wet Weather Flow Management Plan (WWFMP) as needing
rehabilitation. The collective estimated costs to design and construct both the rehabilitation and
conveyance projects for the existing system are approximately $25.6 million. It is important to
note that the City's master planning effort works in combination with the existing WWFMP
(adopted by Springfield, Eugene and the Metropolitan Wastewater Management Commission in
2001) to identify the most cost effective alternatives for a combination of rehabilitation and
conveyance projects. Over the last several years, the City has implemented the WWFMP-
recommended rehabilitation projects with costs ranging from $600,000 to $1,100,000, annually.
The remaining three projects identified in the draft WWMP, also depicted on Exhibit 2, consist
of rehabilitation and additional conveyance for the existing wastewater system to accommodate
build-out of available land inside the UGB. The costs estimated for these proje'?ts are
approximately $11.3 million. These projects will support the City Council's objectives f~r
development in Glenwood, the Jasper-Natron area, and the remainder of the unserved properties
Attachment A
Page 2 of 4
with Springfield's portion of the UGB.
The current contract for this project will expire at the end of June. Staff is continuing to work
with CH2M-Hill to prioritize projects and deliver a final plan. The project is within the adopted
budget and funds for the project are included in the fiscal year 2007 - 2008 Public Works budget.
B. STORMW ATER FACILITY MASTER PLAN
Background
In March of2007, staff updated the Council regarding status of the Stormwater Facility Master
Plan (SWFMP). Since that time, URS Corporation has developed the necessary data and tools to
analyze the City's stormwater system. Springfield has a very complex stormwater system .
incorporating pipes, constructed channels and natural streams. This plan identifies and provides
solutions to alleviate chronic capacity problems, and accommodate anticipated growth. When
completed, the plan will also address the water quality requirements of future facilities. The last
adopted stormwater master plans for the City were completed in 1979 (east) and 1983 (west).
These plans only addressed the portion of the system within the Springfield portion of the Urban
Growth Boundary (UGB), which did not include Glenwood at that time. The draft plan includes
projects that are needed to extend and improve the system to the McKenzie and Willamette
Rivers.
Discussion
The initial draft of the SWFMP submitted by URS Corporation presents the methods and results
of the first phase of the project, with a focus on flood control and capital improvement projects.
This phase provides basic data for the City's Capital Improvement Program (CIP), SDC
methodology development and support for the development community. The next phase will
address water quality and City policies related to stormwater management. A final document
will be prepared at the conclusion ofthe second phase of the project.
The initial draft document provides a summary of the need for the plan, and a description of the
approach for preparing the plan. Sections are included describing the study area characteristics
and their impact on the development of the hydrologic and hydraulic model tool used to identify
problem areas, and identifying solutions in the City's stormwater system.
The analysis evaluated the City's existing infrastructure and then evaluated the future needs
posed by anticipated growth and build out of the lands within the Springfield portion of the UGB.
Rainfall, topography, land use and zoning, and soil conditions were factored into the results
generated by the analysis. Contributing areas inside and outside of the City were identified as
catchments, each generating storm water flows. These flows have multiple exit points from the
City into both the McKenzie and the Willamette Rivers. Some drainage systems traverse the
City to Lane County and others to the City of Eugene.
The analysis identified 41 areas, as depicted on Exhibit 3, where there are capacity and flooding
Attachment A
Page 3 of 4
problems within the existing stormwater system, based upon the rainfall we experienced during
the 1996 flood event. Of those sites, 21 were given priority for inclusion into the CIP project list.
Four sites were determined as the highest priority and additional analysis was performed to
develop solutions that are more detailed. Those highest priority sites in order of significance are
Glenwood, Gray Creek (east Thurston), Jasper-Natron and the Channel 6 Basin (north ofI-105
and south of Hayden Bridge Rd.). The computer modeling completed as the foundation of the
plan will provide long-awaited system capacity information needed by the development
community as well as City Public Works staff.
The SWFMP does not, at this time, contain cost estimates that are refined adequately to describe
the total project and overall CIP costs. While some project costs can be readily identified, other
project areas have additional complexity and are identified as conceptual at this time. Many
variables in stormwater projects can change both the cost and scope of construction. Some of the
identified projects will only be identified in the plans on a conceptual basis for future refmement.
Some project costs will be better estimated after Phase IT of the SWFMP is complete.
Phase IT of the Master Plan study will contain water quality evaluations, an evaluation of
stormwater Best Management Practices (BMPs) related to clean water requirements,
recommendations for a monitoring program for flow and pollutants, a Policies and Procedures
Manual, and miscellaneous items remaining in the contract scope of work.
Staff is currently reviewing the Phase I document and will provide comments to the consultant.
The project is within adopted budget and funds for the project are included in the fiscal year 2007
- 2008 Public Works budget.
C. NEXT STEPS
Once completed, Staff will be proceeding with the approval process of the two master plans
simultaneously. This process will entail the following steps: 1) fmalizing the draft plans; 2)
presenting the plans to the Planning Commission in their role as the City's Committee for Citizen
Involvement (eCI); 3) conducting appropriate public outreach; 4) formal City Council review
and adoption of the plans; and 5) initiation and adoption of appropriate Metro Plan and Public
Facilities and Services Plan (PFSP) amendments. Staff anticipates that the fmal adoption of the
plans by the City Council will occur in the early summer of 2008, which rimy result in the delay
of the implementation of the updated Systems Development Charge (SDC) rates until late
summer.
Concurrent with the process to adopt the two master plans, staff is moving forward with the steps
necessary to fund and finance the resulting CIP projects. These steps include developing a '
capital financing plan; updating the City's SDC methodologies; and evaluating the need to
increase user fees. All of these steps will be brought to the City Council for review this spring.
COUNCIL ACTION REQUESTED
None. This item is for the Council's information and discussion.
'/
Attachment A
Page 4 of,4
J
,..
..;
over
McKenzie "I
}'
North
~ /'
Branch e;;
c~\,\1l'2.
!--'
(fJ
iE
;!
SAST
..
./
if" 11
" "'........
~
V
r: rK Wi\\amette
Middle ,,0' ~,
, <
~
Q=3.0
..
,r"
/
J
FilA P<=lth: P'\SDrin(']fipldOrCjtv()f\~-504f)7\nIS\M;;'l!1 n()r.1Jment~\FxmmdAdS~rvices_m)(d Date' Januarv 7 200810-39:20AM
JB)
pump ::;tallons to De
Decommissioned
II
Future Pump Stations
l1U
Pump Stations
...
WeirlDiversion
Expanded Service Pipes by Diameter
Sinch
8 inch
10 inch
12 inch
1Sinch
21 inch
Existing Major Wastewater
System Pipes
c::J Urban Growth Boundary
Expansion Areas
.. East South
.. East Thurston Rd
.. Franklin Blvd
.. Harbor Drive
.. Jasper Road
.. Vera PS Area
Note: Q at point (mgd)
j
o 2,000 4,000
I I I I I
Approximate scale in feet
FIGURE 5.5
Expanded Service Pipes
City of Springfield Wastewater Master Plan
CH2MHILL
~\.
II
)
./
~
r
f-.JC
(J) C
>-;5
~ >.
UJ ~
~.!!
<:leg
Zie River ~
McKe,E
(
'-- River
____ --.-Glen
"~
/
" ,
HAYD
ROE WAY
/,J...:
~
,I' ,.,., ~
-Nort~ i
Branch
,-
!
..
11,
~'.f--'
f
~...~~ "-~~
f-
Cf)
r
I-
:':
...
...
./
,
~".,~
../
~
:\i. 1
'...
- G"d'"~
T.=~ ~ ~
, Jasper
Meadows
(private)
..
~
#'
,.
~
~
b
.~.;'
QIJ Pump Stations 0 Existing Water Tight Manhole Improvements Ii'Iil Future Basin Rehabilitation
(V"vWFMP Subbasin 10)
. Existing Pump Station Improvements 0 Future Water Tight Manhole Improvements ~ Existing Basin Rehabilitation
~ Pump Stations to be Future Pipe Improvement Cl Urban Growth Boundary
Decommissioned J
II Future Pump Stations Existing Pipe Improvement
0 2,000 4,000
Existing Major Wastewater System Pipes I I I I I
... Weir/Diversion Approximate scale in feet
FilA P::lth' \\~jmh:=\\n,.....i\~nrinnfi,:::,.lrlnrr.ih,()f\':I,t:;n.1R7\.(~Ic:.\r..II:::ln nr"\rt 1IT1J:>nte>\C"C't'<:>n'lln'lnrf'l\It::>tTl,:mte> rnvrl n-:.t.:.' I",,,,, ""...." A ')/lno
r-~
11
13
1..'f'
" .
'J
c..;,.
'---"
..
...
\
,-
,-
~
'~
~-:-;
If'
j
,
12
..
I
}
)
,
,
, ,
.
I
FIGURE 5.3
System Improvements
City of Springfield Wastewater Master Plan
CH2MI-IILL
.
~
~
::r
f-l.
0"'
f-l.
r-t
'410;
t"..'
j'
""i~'. J1>
< ":..- /:f
\
City of Springfield
Stormwater Facilities Master Plan
Capital Improvement Projects
Figure 5-1
'.,,~''''-
+0....
J.
i-'''i
';(o.r;~'f.
t/'-~<
c:::> High Priority CIPs
c::> Lower P;iority CIPs :____: Springfield City Limits
- Non-Flooded Drainage Links 0 Urban Growth Boundary
Ill) Rivers, Lakes, and Ponds
o Boundary of Total Modeled Drainage Areas
0.5
1.5
2
'Miles
6
'N
- Flooded Drainage Links
Map Produced by URS & GeoDataScape Inc., December 2007
,'~~-""-,.....:--.".
w
~
Oa.s'/";
0",
% 'r "
~'?> J"
. ~":"'i,,.
a> " ~ .
l:}
j