HomeMy WebLinkAbout15.D.1. Authorize Storm Water Management Plan (SWMP) Update and an MPCA, NPDES Phase II Non-Degradation Plan
1S: D. I,
CITY OF SHAKOPEE CONSENT
Memorandum
TO: Mayor & City Council
Mark McNeill, City Administrator
FROM: Bruce Loney, Public Works Director
SUBJECT: Authorize Preparation of an Update to the
City's Comprehensive Storm Water Management Plan and an
MPCA, NPDES Phase II Non-Degradation Plan
DATE: November I, 2005
INTRODUCTION:
Attached to this memorandum is a proposal from WSB & Associates, Inc. on updating
the City's Comprehensive Stormwater Management Plan to meet the Minnesota Rules
8410. Also, this proposal includes preparing a Non-Degradation Plan, as required by the
MPCA National Pollution Discharge Elimination Phase II Permit, as the City of
Shakopee was one of the 30 cities selected to prepare a plan due to its development and
growth.
BACKGROUND:
The City of Shakopee has prepared a Comprehensive Stormwater Management Plan,
which was required by the Metropolitan Service Water Act and to be in compliance with
watershed management organizations and watershed districts within the City of
Shakopee. The City of Shakopee has two watershed districts and one watershed
management organization in its jurisdictional boundaries. These organizations are as
follows:
. Prior Lake-Spring Lake Watershed District
. Scott County Watershed Management Organization
. Lower Minnesota River Watershed District
The watershed districts have completed their second-generation watershed management
plan and most recently Scott County Watershed Management Organization has
completed their first generation plan, which has been approved by the Board of Soil and
Water Resources. Once these plans have been approved, the City of Shakopee must
revise its current Comprehensive Stormwater Management Plan to be consistent with the
plans that have been approved by the Board. of Soil and. Water Resources. Per the rules,
the City of. Shakopee must have an updated Comprehensive Stormwater Management
Plan by the spring of 2006.
WSB & Associates, Inc. has done the initial Stormwater Management Plan for the City
and has been doing the stormwater management planning for the Comprehensive Plan as
well. The proposal submitted by WSB & Associates, Inc. outlines the number of tasks to
complete the update of the Comprehensive Stormwater Management Plan, with a
maximum cost not-to-exceed cost of $36,300.00.
In addition, the MPCA has selected 30 cities to prepare a Non-Degradation plan to be in
conformance with the NPDES Phase II Rules. The proposal from WSB & Associates,
Inc. outlines the necessary tasks to complete the Non-Degradation plan. Most ofthe rules
have been clarified by the MPCA for the completion of the Non-Degradation Plan with
the exception of the deadline yet to be established for the City of Shakopee. The cost to
prepare this non-degradation plan is $32,000.00.
Staff did include funds in the 2005 Storm Drainage Fund for the upgrade of the
Comprehensive Stormwater Management Plan. Staff is also anticipating including funds
in the 2006 Storm Drainage Fund budget for the final updating of the Comprehensive
Stormwater Management Plan and the Non-Degradation Plan needed for the MPCA.
Both of these tasks are considered overall stormwater management tasks needed for
complying with State requirements for watershed management. Thus, it is proposed the
cost for these Stormwater Management Plan and Non-Degradation Plan be expended
from the Storm Drainage Fund.
ALTERNATIVES:
I. Authorize the appropriate City officials to execute an extension agreement with
WSB & Associates, Inc. for the update to the City's Comprehensive Stormwater
Management Plan and to prepare a Non-Degradation Plan to meet the MPCA/
NPDES Phase II Rules at a total cost not-to-exceed of $68,300.00.
2. Do not approve an extension agreement at this time.
3. Table for additional information.
RECOMMENDATION:
Staffrecommend's Alternative No. I, due to the fact that State requirements mandate that
the City update its Comprehensive Stormwater Management Plan by spring of 2006,
since the two watershed districts and the water management organization have completed
their plans and have been approved by the Board of Soil and Water Resources. Also,the
Non-degradation Plan has been mandated by the MPCA/NPDES Phase II Rules requiring
the City to proceed with that plan as well and to be completed by March 1, 2007.
ACTION REQUESTED:
Authorize the appropriate City officials to execute an extension agreement with WSB &
Associates, Inc. for the update to the City's Comprehensive Stormwater Management
Plan and to prepare a Non-Degradation Plan to meet the MPCAlNPDES Phase II Rules at
a cost not-to-exceed $68,300.00.
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Public Works Director
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ENGRlEFIPPENNINGTON/COUNCIUSTW ATERPLANS
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WSB
& Associates, Inc. Infrastructure I Engineering I Planning I Construction 701 Xenia Avenue South
Suite 300
October 26,2005 Minneapolis, MN 55416
Tel: 763-541-4800
Fax: 763-541-1700
Mr. Bruce Loney, P.E.
City of Shakopee
129 Holmes Street South
Shakopee, MN 55379
Re: Extension Agreement to Update the Comprehensive Storm Water Management Plan and
Prepare the MPCA NPDES Phase II Non-Degradation Plan for the City of Shakopee, MN
Dear Mr. Loney:
According to our agreement for professional services with the City of Shakopee and Section
I-C-2 (major projects), this Extension Agreement is written to provide professional services for
the above referenced projects.
Both the Comprehensive Storm Water Management Plan and the Non-Degradation Plan for the
City of Shako pee incorporate many of the same elements and modeling requirements to meet
review agency approvals. In an effort to streamline the process, we are proposing that we would
undertake both ofthese projects simultaneously so as to not expend additional monies
duplicating efforts in the near future.
We have provided a breakdown ofthe scope of services for the update to the Comprehensive
Storm Water Management Plan and the Phase II Non-Degradation Plan separately. Please be
aware the costs currently contained within this Extension Agreement anticipate that both projects
would be undertaken simultaneously to avoid duplication of efforts. We anticipate close
coordination ofthese efforts between the Watershed Districts, the WMO's and the Minnesota
Pollution Control Agency during the development ofthese projects. Below please find a
breakdown of the anticipated scope of services for each of the projects and the anticipated cost to
complete them:
I. Update Comprehensive Storm Water Management Plan
We propose to revise the City of Shako pee's Comprehensive Storm Water Management
Plan in a manner that would be consistent with the amendment procedures outlined in the
existing plan. We believe that a complete revision of the document is necessary to
incorporate the proposed annexation areas into the plan and to be in conformance with
the current watershed district and watershed management organization plans. We
anticipate completing the following tasks:
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October 26, 2005
Page 2
A. Review WMO and WD Watershed ManagementPlans
WSB will obtain copies of the current plans and review them for policy conflicts and any
new requirements for local units of government. We will review the following watershed
district and WMO plans:
a. Prior Lake Spring Lake Watershed District
b. Scott County Watershed Organization
c. Lower Minnesota River Watershed District
Following a review ofthe watershed district and watershed management organization
plans, we will meet with City staff, and ifnecessary the WD's and WMO, to review any
inconsistencies in the City's plan and to discuss our approach and response to any new
requirements.
Anticipated cost to complete this Task: $3,800 - $4,500.
B. Incorporate NPDES Storm Water Pollution Prevention Plan
WSB will review the City's NPDES Storm Water Pollution Prevention Plan (SWPPP) for
conflicts and conformance with the Storm Water Management Plan. We will work with
City Staffto identify and incorporate elements of the SWPPP into the Storm Water
Management Plan.
C. Revise Goals and Policies
We anticipate meeting with City staffto review the goals and policies section and to
determine if any of the policies have presented problems to the City of Shakopee through
implementation over the last five years, or ifthere are additional policies required which
can aid City staff in implementation of storm water improvements. In addition, WSB
will provide recommendations to address new requirements ofthe WMO, WDs, MPCA,
BWSR, and the City's SWPPP into the goals and policies section of the plan.
Anticipated cost to complete this Task: $4,200 - $4,600.
D. Revise Problem Areas and Corrective Actions
We will incorporate any new issues that have arisen since the City's 1999 plan, and
include any new problems or concerns contained within the WD plans, WMO plans, and
the City's SWPPP. A meeting will be held with City staff to review any new problems
and discus the status of the corrective actions identified in the 1999 plan.
WSB will update the City's Hydrologic Modeling as part ofthis Task. This update will
include:
F:\WPWIMTEHILTR-BLolley-E.ttAgmtCSWMP-I02605.cloc
Mr. Bruce Loney, P.E.
October 26, 2005
Page 3
1. Incorporating the Annexation areas into the plan
2. Incorporating all new developments which have occurred since the last update
3. Requirements of the WD's and WMO
4. Agreements the City has entered into
Anticipated cost to complete this Task: $12,500 - $16,200.
E. Update Implementation Priorities and Programs
Based on revisions to the goals and policies section, problem and corrective actions
section, and any additional or new requirements from WDs,WMOs, MPCA, and BWSR,
we will revise and update the implementation priority and the implementation program
section within the City's Storm Water Management Plan. We will review the proposed
changes with City staff.
Upon revising ofthe City's Storm Water Management Plan, we anticipate holding a
public meeting to receive input on the proposed changes and to keep the public informed
of the City's progress on addressing and improving water quality within the City of
Shakopee.
Anticipated cost to complete this Task: $3,200 -$3,800.
F.Plan Preparation and Review Process
WSB will prepare and provide approximately ten copies of a draft plan for distribution to
review agencies and City staff. Upon receiving comments from review agencies WSB
will meet with City Staff to prepare responses and revisions to the plan. Following this
meeting, WSB will provide responses to the WMO and WDs for approval.
Upon approval ofthe Storm Water Management Plan by the review agencies, WSB will
provide ten copies of the document to the City along with digital files of the plan in a
format consistent with the City's computer system.
Anticipated cost to complete this Task: $6,800 - $7,200.
WSB proposes to complete the update to the City's Comprehensive Storm Water Management
Plan for an estimated cost of $30,500 - $36,300 with a not-to-exceed cost of $36,300. This Task
is anticipated to be completed by the spring of2006 to meet the requirements of the Watershed
Districts and WMO's.
II. Prepare MPCA Non-Degradation Plan
The work plan we recommend utilizing to complete your non-degradation plan in
conformance with NPDES Phase II rules as outlined below:
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Mr. Bruce Loney, PE.
October 26, 2005
Page 4
A. Collect Background Information
As part of this task, WSB will collect necessary background information as it relates to
the development of a non-degradation plan for the City of Shakopee. Land use
information, aerial photography, available GIS mapping, and other information available
will be utilized to the fullest extent necessary to address the requirements ofNPDES
Phase II Rules. Much of this information is already available in our WSB Library.
Anticipated cost to complete this Task: $3,000.
B. Coordination With MPCA / Secure Approval of Work Plan
WSB's proj ect team will work with the City of Shakopee and the MPCA to
develop a process and methodology for responding to the non-degradation
requirements. This task anticipates holding up to four meetings with MPCAand/or City
staffto discuss methodologies proposed by WSB to complete the non-degradation storm
water modeling, define the assumptions needed to evaluate conversion of undeveloped
areas to developed areas, and quantify the benefits provided by various best management
practices (BMPs). We anticipate two meetings with the MPCA at the onset of the project
to discuss and receive approval of a finalized methodology to address the non-
degradation plan. This work may take up to 3 months to complete.
Anticipated cost to complete this Task: $1,800.
C. Land Use Analysis
This task involves the development of data, maps, and tables that can be used to estimate
volume, total suspended solids, and total phosphorus loadings for three specific land use
conditions within the City of Shakopee:
1. The land use conditions of the City of Shakopee that were present in 1988.
2. The land use conditions present in year 2000. This effort would require an
analysis of land-use conversion that occurred in the City of Shako pee from
1988 to 2000. This will identify areas where increases in impervious surface
area mayor may not have increased the loadings of pollutants to waters of the
State.
3. The development of information that predicts the areas of future growth
within the City through the year 2020. The impact of future development on
changes in impervious surface cover will be determined with this analysis.
Anticipated cost to complete this Task: $5,000 - $7,500.
D. Non-Degradation Water Quality Modeling
Water quality modeling as required in the NPDES Phase II rules will be completed as
part ofthis task. WSB proposes to utilize an approach consistent with P8 modeling for
this purpose; however, refinement of the approach will be undertaken as part of Task B.
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Mr. Bruce Loney, P.E.
October 26, 2005
Page 5
WSB Staff will utilize information contained in the City of Shakopee's storm water
management plan in conjunction with GIS mapping for the City to determine the impact
of land conversion for land use conditions defined in Task C. This will include
development ofP8 or similar modeling for each type of developed and undeveloped land-
use identified within the City. WSB will utilize existing soils information and land-use to
determine the changes in pollutant loadings of total phosphorous, total suspended solids,
and runoff volume.
We will utilize the requirements outlined in the City's storm water management plan to
quantify the extent to which new areas of development receive treatment in the form of
storm water ponding, infiltration basins, overland overflow, and other best management
practices which provide benefits to reducing storm water runoff volumes and pollutant
loadings. WSB will develop anticipated benefits from each BMP identified in the City's
current NPDES Phase II permit and the capital improvements and policy requirements
contained in the comprehensive storm water management plan to determine the net
increase or decrease in total phosphorous, total suspended solids, and runoff volumes
from developed areas.
Anticipated cost to complete this Task: $5,000 - $7,000.
E. Evaluation of Modeling Results
WSB will provide a report interpreting the results of the modeling activities described in
Task IV. This task will summarize the modeling methodologies and determine the net
increase or decrease of total phosphorous, total suspended solids, and runoff volume from
areas which have developed in the City of Shako pee from 1988 and are anticipated to
develop through the year 2020.
Anticipated cost to complete this Task: $3,000 - $4,000.
F. Mitigation Plan Development
As part ofthis task, we will prepare a mitigation plan to meet the requirements ofthe
NPDES Phase II rules. The plan will identify the best management practices which may
be implemented by the City of Shako pee to return runoff volumes, total phosphorous, and
total suspended solids and loadings to 1988 levels. This non-degradation plan will
include a discussion associated with the costs to implement the proposed best
management practices, and a test of reasonableness to determine if the activities
identified within the management plan are considered feasible and prudent for
implementation.
Anticipated cost to complete this Task: $6,000 - $8,000.
WSB proposes to prepare an NPDES Non-Degradation Plan for the City of Shakopee with an
estimated cost of$23,800 - $31,300 and a not-to-exceed cost of$32,OOO. This Non-Degradation
Plan will be completed by the deadline established by the MPCA for the City of Shakopee.
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Mr. Bruce Loney, P.E.
October 26, 2005
Page 6
The anticipated total project cost ranges from $54,300 - $67,800 with a not-to-exceed cost of
$68,300.
The City of Shakopee agrees to reimburse WSB & Associates, Inc. for these services in
accordance with Section V of the Agreement for Professional Services.
Ifthis agreement meets with your approval, please sign below and return one copy to our office.
Sincerely,
';$A -.
Todd E. Hubmer, P.E.
Project Manager
cc: Pete Willenbring, P.E., WSB & Associates, Inc.
Bret Weiss, P.E., WSB & Associates, Inc.
kw
City Admin.
City Clerk
Mayor
Date
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MS4 proposed Permit 2/28/05 Page 30 of 30
The following selected MS4s shall submit their plan for nondegradation and, the proposed
Storm Water Pollution Prevention Program to the MPCA for review and approval,
postmarked on or before the listed dates.
Selected MS4 Submittal date
1 Rochester January 1, 2007
2 Woodbury January 1, 2007
3 Maple Grove January 1, 2007
4 Lakeville January 1, 2007
5 Eden Prairie January 1, 2007
6 Eaqan February 1, 2007
7 Plymouth February 1, 2007
8 Blaine February 1, 2007
9 Bloomington February 1, 2007
10 Duluth February 1, 2007
11 Brooklyn Park March 1, 2007
12 Shakooee March 1, 2007
13 Apole Valley March 1, 2007
14 St. Cloud March 1, 2007
15 Burnsville March 1, 2007
16 Prior Lake April 1 , 2007
17 Maolewood April 1 , 2007
18 Coon Rapids April 1, 2007
19 Andover April 1 , 2007
20 Elk River April 1 , 2007
21 Savaqe May 1, 2007
22 Farminqton May 1, 2007
23 St. Louis Park May 1, 2007
24 Edina . May 1, 2007
25 Minnetonka May 1, 2007
26 Chanhassen June 1, 2007
27 Chaska June 1, 2007
28 Inver Grove Heiqhts June 1, 2007
29 Rosemount June 1, 2007
30 Cottaqe Grove June 1, 2007
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