HomeMy WebLinkAboutItem 06.ir
August 16, 2013 Item No.
APPROVE JOINT POWERS AGREEMENT WITH VERMILLION RIVER
WATERSHED JOINT POWERS ORGANIZATION AND THE CITY OF
FARMINGTON FOR COST SHARE RELATED TO UPDATE OF LOCAL
STORMWATER MODELS
August 19, 2013 City Council Meeting
Proposed Action
Staff recommends adoption of the following motion: Move to approve Joint Powers
Agreement (JPA) with Vermillion River Watershed Joint Powers Organization ( VRWJPO) and
the Cif of Farmington for cost share related to update of local stormwater models, City
Project 13 -12.
Passage of this motion will establish City and VRWJPO project responsibilities and costs
associated with the loca! stormwater mode! updates.
Overview
To comply with the VRWJPO's inter- community flow standards, the City is updating its
hydrologic model. The updated hydrologic modeling will establish peak flow rates and runoff
volumes at municipal boundaries consistent with VRWJPO requirements. The City previously
entered into a JPA with the VRWJPO and Farmington to complete phase 1(North Creek) of the
modeling. This JPA is to complete the remaining phases (2 -5) of the modeling. The modeling
update is scheduled to begin this fall.
Primary Issues to Consider
® What benefit will this project provide?
• How will the project be financed?
Supporting Information
• Staff analysis of primary issues
• A copy of the Joint Powers Agreement is attached (Contract No. C0025127)
• A copy of the Barr Engineering Scope of Work, dated May 15, 2013, is attached
Zac o
City ngineer
Financial Impact: $95,300 Budgeted: Yes Source: Utility Fund — Env. Resources
Related Documents (CIP, ERP, etc.):
Notes: Additional funding provided by VRWJPO and the City of Farmington
Staff Analysis of Primary Issues
• What benefit will this project provide?
The hydrology identified in the City's current Water Resources Management Plan was
not revised during the City's 2008 Comprehensive Plan Update because the VRWJPO
had not yet completed the update of their hydrologic model. This project will update
the City's hydrologic model and serve as guidance to ensure that peak flow rates and
runoff volumes at municipal boundaries comply with VRWJPO requirements and
create uniformity with Farmington's hydrologic model.
• How will the project be financed?
The VRWJPO has a cost - sharing policy providing guidance for projects affecting the
Vermillion River Watershed. In an collaborative effort to achieve cost - savings and
ensure agreement between the two hydrologic models, the cities of Lakeville and
Farmington submitted a joint request for funding assistance; this project qualified for
a 50% cost share. Phase 4 of Lakeville's hydrologic model is located within the Black
Dog Watershed and is not eligible for funding assistance from the VRWJPO.
Listed below is a summary of the project's funding sources:
a. VRWJPO:
$111,250
b. Lakeville:
$95,300
c. Farmington:
$62,450
d. Total:
$269,000
Dakota County Contract #C0025127
JOINT POWERS AGREEMENT
BETWEEN THE VERMILLION RIVER WATERSHED JOINT POWERS ORGANIZATION
AND
THE CITIES OF FARMINGTON AND LAKEVILLE
FOR COST SHARE RELATED TO UPDATE OF LOCAL STORM WATER MODELS
WHEREAS, Minn. Stat. § 471.59 authorizes local governmental units to jointly or cooperatively exercise any power
common to the contracting parties; and
WHEREAS, the Vermillion River Watershed Joint Powers Organization is a watershed management body
consisting of Dakota and Scott Counties ( VRWJPO) governed by the Vermillion River Watershed Joint Powers Board
(VRWJPB) and is charged with carrying out the duties set forth in Minn. Stat. §§ 103B.211 to 103B.255 and as otherwise
provided by law; and
WHEREAS, the Cities of Farmington and Lakeville (collectively refern9d to as "the Cities ") are governmental units
and political subdivisions of the State of Minnesota; and
WHEREAS, the Cities desire to update their respective storm water models to comply with the VRWJPO Watershed
Plan inter- community flow standards; and
WHEREAS, the Cities, in a collaborative effort, developed a scope of work for updating their respective surface
water models (Project); and
WHEREAS, the Project consists of five phases and the VRWJPO previously provided cost share funding to the
Cities in the amount of $47,700.00 for Phase 1 of the Project (VRW Res. No. 11 -13); and
WHEREAS, Phase I of the Project has been completed and the Cities are now seeking cost share funding from the
VRWJPO for Phases 2 - 5 of the Project; and
WHEREAS, the estimated cost of Phases 2 - 5 of the Project is $222,500.00; and
WHEREAS, the VRWJPO adopted its Watershed Plan on November 3, 2005, and said Watershed Plan contains a
Cost Sharing Policy that provides guidance to the VRWJPB regarding the cost sharing between the VRWJPO and
potential partners for various watershed management efforts affecting the Vermillion River Watershed; and
WHEREAS, the Cost Sharing Policy sets forth priorities for improvements affecting the Vermillion River Watershed
and Phases 2 - 5 of the Project qualify Poor up to a 50% cost share; and
NOW, THEREFORE, in consideration of the mutual promises and benefits that the VRWJPO and the Cities shall
derive from this Agreement, the VRWJPO, through the VRWJPB, and the Cities hereby enter Into this Agreement for the
purposes sued herein.
ARTICLE 7
PURPOSE
The purpose of this Agreement is to define the responsibilities and cost sharing obligations of the VRWJPO and the Cities
for Phases 2 - 5 of the Project as more fully described in Exhibit 1, attached hereto and incorporated herein by this
reference.
ARTICLE Z
PARTIES
The parties to this Agreement are the Vermillion River Watershed Joint Powers Organization ( VRWJPO) acting through its
Joint Powers Board (VRWJPB) and the City of Farmington, Minnesota, and the City of Lakeville, Minnesota (collectively
"the Cities").
ARTICLE 3
TERM
This Agreement shall be effective the date of the signatures of the parties to this Agreement and shall remain in effect
until December 31, 2014, or until completion by the parties of their respective obligations under this Agreement, whichever
occurs first, unless earlier terminated by law or according to the provisions of this Agreement
ARTICLE 4
COOPERATION
The VRWJPO and the Cities agree to cooperate and use their reasonable efforts to ensure prompt implementation of the
various provisions of this Agreement and to, in good faith, undertake resolution of any dispute in an equitable and timely
manner.
ARTICLE 5
PAYMENT
5.1 The VRWJPO shall cost share with the Cities in an amount equal to 50% of the total cost incurred by the Cities for
Phases 2 - 5 of the Project, but not to exceed the amount of $111,250.00 (Agreement Maximum). Of the
Agreement Maximum, Forty eight Thousand Eight Hundred and No/100 Dollars ($48,800) is allotted to the City of
Lakeville for its costs incurred for Phases 2 — 5 of the Project; and Slaty Two Thousand Four Hundred Fifty
and Noll 00 Dollars ($62,450) is allotted to the City of Farmington for its costs incurred for Phases 2 — 5 of the
Project.
5.2 The VRWJPO shall make payment to the Cities after Phases 2 — 6 of the Project has been completed and the
VRWJPO has been provided with a final report as required by Section 6.2 below. The VRWJPO shall make
payment to the Cities within 45 days foilowing receipt of the final report and receipt of an invoice detailing the
costs incurred by the Cities in conducting Phases 2 — 5 of the Project.
5.3 The VRWJPO may refuse to pay any claim that is not specifically authorized by this Agreement. Payment of a
claim shall not preclude the VRWJPO from questioning the propriety of the claim. The VRWJPO reserves the
right to offset any overpayment or disallowance of claim by reducing future payments.
ARTICLE 6
CITY'S OBLIGATIONS
6.1 AUTHORIZED PURPOSE. The cost share funds provided under this Agreement may only be used by the Cities
for the payment of costs associated in conducting Phases 2 — 5 of the Project as described in Exhibit 1.
6.2 FINAL REPORT. Following completion of Phases 2 — 5 of the Project, the Cities shall provide to the VRWJPO a
final technical memorandum that outlines the completion of modeling elements as well as the findings,
conclusions and recommendations of Phases 2 — 5 of the Project.
6.3 ACKNOWLEDGMENT. The Cities shall appropriately acknowledge the funding assistance provided by the
VRWJPO in any promotional materials, signage, reports, publketions, notices, and presentations relating to the
Project. This section shall survive the expiration or termination of this Agreement
GA COMPLIANCE WITH LAWSISTANDARDS. The Cities shall abide by all federal, state, or local laws, statutes,
ordinances, rules and regulations in conducting the Project.
ARTICLE 7
TERMINATION
7.1 IN GENERAL. Any party may terminate this Agreement for cause by giving seven days' written notice or
without cause by giving 30 days' written notice, of its intent to terminate, to the other parties. Such notice to
terminate for cause shall specify the circumstances warranting termination of the Agreement Cause shall mean
a material breach of this Agreement and any supplemental agreements or amendments thereto. Notice of
Termination shall be made by certified mail or personal delivery to the authorized representative of the other
parties. Termination of this Agreement shalt not discharge any liability, responsibility or right of any party, which
arises from the performance of or failure to adequately perform the terms of this Agreement prior to the effective
date of termination.
7.2 TERMINATION BY VRWJPO FOR LACK OF FUNDING. Notwithstanding any provision of this
Agreement to the contrary, the VRWJPO may immediately terminate this Agreement if it does not obtain funding
from the Minnesota Legislature, Minnesots Agencies, or other funding source, or if it's funding cannot be
continued at a level sufficient to allow payment of the amounts due under this Agreement. Written notice of
termination sent by the VRWJPO to the Cities by facsimile is sufficient notice under this section. The VRWJPO is
not obligated to pay for any services that are provided after written notice of termination for lack of funding. The
VRWJPO will not be assessed any penalty or damages if the Agreement is terminated due to lack of funding.
ARTICLE 8
GENERAL PROVISIONS
8.1 LIABILITY. Each party to this Agreement shall be liable for the acts of its officers, employees or agents and the
results thereof to the extent authorized by law and shall not be responsible for the acts of the other party, its
officers, employees or agents. The provisions of the Municipal Tort Claims Act, Minn. Stat. ch. 468 and other
applicable laws govern liability of the VRWJPO and the Cities. This section shall survive the expiration or
termination of this Agreement
8.2 AUTHORIZED REPRESENTATIVES. The following named persons are designated the Authorized
Representatives of the parties for purposes of this Agreement These persons have authority to bind the party
they represent and to consent to modreations, except that the authorized representatives shall have only the
authority specifically or generally granted by their respective governing boards. Notice required to be provided
pursuant to this Agreement shall be provided to the following named persons and addresses unless otherwise
stated In this Agreement, or in a modification of this Agreement:
TO THE VRWJPB: Paul Krause or successor, Chair
Vermillion River Watershed Joint Powers Organization
14955 Galaxie Avenue
Apple Valley, MN 55124
Telephone: (952) 891-7030
TO FARMINGTON: Todd Larson or successor, Mayor
City of Farmington
430 Third St.
Farmington, MN 55024
Telephone: (651) 280.6BW
TO LAKEVILLE Matt Little or successor, Mayor
City of Lakeville
20195 Holyoke Ave.
Lakeville, MN 55044
Telephone: (952) 985 -4420
In addition, notification to the VRWJPO regarding termination of this Agreement shall be provided to the Office of
the Dakota County Attorney, Civil Division, 1560 Highway 55, Hastings, Minnesota 55033.
8.3 LIAISONS. To assist the parties in the day -to-day performance of this Agreement and to ensure compliance and
provide ongoing consultation, a liaison shall be designated by the VRWJPO and the Cities. The VRWJPO and
the Cities shall keep each other continually informed, in writing, of any change in the designated liaison. At the
time of execution of this Agreement, the following persons are the designated liaisons:
VRWJPO Liaison: Mark Zabel
Telephone: (952) 891 -7546
Farmington Liaison: Kevin Schorzman
Telephone: (651) 281)-6800
Lakeville Liaison: Keith Nelson
Telephone: (952) 985
B.4 MODIFICATIONS. Any alterations, variations, modifications, or waivers of the provisions of this Agreement shall
only be valid when they have been reduced to writing, approved by the parties respective Boards, and signed by
the Authorized Representatives of the VRWJPO and the Cities.
8.5 RECORDS RETETION AND AUDITS. Each party's bonds, records, documents, papers, accounting procedures
and practices, and other records relevant to this Agreement are subject to the examination, duptication,
transcription and audit by the other party, the Legislative Auditor or State Auditor under Minn. Stat. § 16C.05,
subd. 5. If the cost share funds provided under this Agreement use federal funds these records are also subject
to review by the Comptroller General of the United States and his or her approved representative. Fallowing
termination of this Agreement, the parties must keep these records for at least six years or longer if any audit-In-
progress needs a longer retention time.
8.6 DEFAULT: FORCE MAJEURE. No party shall be liable to any other party for any loss or damage resulting
from a delay or failure to perform due to unforeseeable acts or events outside the defaulting party's reasonable
control, providing the defaulting party gives notice to the other party as soon as possible. Acts and events may
include acts of God, acts of terrorism, war, fire, flood, epidemic, acts of civil or military authority, and natural
disasters.
83 ASSIGNMENT. No party may assign any of its rights under this Agreement without the prior written consent
of the other parties. Said consent may be subject to conditions.
8.8 GOVERNMENT DATA PRACTICES. For purposes of this Agreement, all data on individuals collected, created,
received, maintained or disseminated shall be administered consistent with the Minnesota Government Data
Practices Act, Minn. StaL ch. 13.
8.9 GOVERNING LAW, JURISDICTION AND VENUE. This Agreement shall be governed by and construed in
accordance with the substantive and procedural laws of the State of Minnesota, without giving effect to the
principles of conflict of laws. All proceedings related to this Agreement shall be venued in the County of Dakota,
State of Minnesota. This section shall survive the expiration or termination of this Agreement
8.10 MERGER. This Agreement is the final expression of the agreement of the parties and the complete and exclusive
statement of the terms agreed upon and shall supersede all prior negotiations, understandings, or agreements.
8.11 SEVERASILITY. The provisions of this Agreement shall be deemed severable. If any part of this Agreement Is
rendered void, invalid, or unenforoeable, such rendering shall not affect the validity and enforceability of the
remainder of this Agreement unless the part or parts that are void, invalid or otherwise unenforceable shall
substantially impair the value of the entire Agreement with respect to either party.
IN WITNESS WHEREOF, the parties hereto have executed this Agreement on the date(s) indicated below.
APPROVED AS TO FORM:
d sistant Dakota County Attorney Date
KS -13-21 O(EF)
VRW Res. No. 13-28
CITY OF FARMINGTON
By
Todd Larson, Mayor
Date of Signature: _
BY
City Clerk
Date of Signature:
CITY OF LAKEVILLE
By
Matt Little, Mayor
Date of Signature:
By
. City Clerk
Date of Signature:
VERMILLION RIVER WATERSHED
JOINT POWERS BOARD
By
Paul J. Krause, Chair
Date of Signature:
5
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May 15, 2013
Mr. Zachary Johnson
City Engineer
City of Lakeville
20195 Holyoke Ave
Lakeville, MN 55044
Mr. Kevin Schomman
City Engineer
City of Farmington
430 Third Street
Farmington, MN 55024
ace. llydWoglc Modeling for the CNtes of Famdngton and l akwAle, Including Atlas 14
Dear Mr. Johnson and Mr. Schommen,
Thank yon far meeting with us on March 19, 2013 to discuss potential implications of Atlas 14 and your
plans for hydrologic modeling within the Vermillion River watershed. During our dissuasion theme won
several questions raised regarding Atlas 14, specifically related to how the updated precipitation depths
could impact the VRWJFO peals flow rate and runoffvahune standards at municipal boundaries. It is our
understanding that the Cities and the VRWJPO would lire to estimate these impacts as pant of the
hydrologio modeling for Lakeville and Farmington.
This letter presents a scope of work to evaluate the impacts of Atlas 14 at VRWJPO standard locations
using the updated Vernnillmn Rivet XP -SWMM model. This letter also includes a wised schedule and
cost for contpledng the ranaimng phases of planned XP -SWIM model updates within Lakovilla and
Pabentlal lmpwb of Aflaa 14
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May 15,2D13
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XP -SWMM model will not need to be mooed to convey storm water nmofff generated by larger
predpitatioo de rft downetoeam to the Vermillion River.
The modeling methodology will be oammarized for each city. Subwatershed results, figures, and tables
sumnierizing the impacts of Atlas 14 updates will be developed, and compiled in a technical
memorandum. An electronic (PDF) draft of this document, the figures, and the tables will be provided to
the Cities for a single round of review and comment.
Additional hypollmlical design xbm m events (Le., SCS 24-hour, 104W Snowmdt Bveot, etc.) can be
simulated using the XP -SWMM model at the Cities request, and will be completed an time and wqmn
in addition to the cast estimate provided for each Phase of model updates.
Plonned XP- M Modeling
In November 2010 Barr provided Lakeville and Farmington a scope of work for completing city-wide
mislons to the VRW3P0 X24WMM model. The Cities selected to complete the updates following a
Phased approach. The development of the November, 2010 scope of work and estimated budget for
e Vnecang sere m assumed that following Compledw of Phase 1, work on sdbsequent phases (2
would begin, and all Phases would be complete by the end of 2011. Phase 1, updates to the North Creek
sabwatetahed were completed in 2011 and the draft report was delimed in January 2012. Following the
Phase 1 updates to the North Creek subwetershed, these was an =anticipated delay between modeIimg
phases. We would also Bros to enure this opportunity to present an updated schedule and request a budget
adjustment for completing the remaining phases of model updates, which are listed below. The remised
schedule and budget atustme nt eensxhw "lessons learned" during the updates to the North Creek portion
of rho XP-4WMM model, and the unanticipated delay between modeling phases. The updated scope,
sae, and budget estimate for each remaining phase are summarized in the following sections.
• Phase 1: Revise the hydrologic modal for the North Creek drainage area - CO A; f'LL IT
• Phase 2: Revise the hydrologic model for the South Creak dtainage area (South Creak, Marian Lake,
and Farmington Outlet)
• Phase 3: Revise: the hydrologic model for the Middle G'mk dtaitiage area
• Phase 4: Complete hydrologic modeling for the remaining drainage arm with the Cities. For
Lakeville this includes the Orchard Labe and Crystal Lake drainage areas is the northwest portion of
the City, and for Farmington this includes the Vermillion River mainstem and adjacent drainage area
in the southeast portion of the city.
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May 1& 2013
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• Phase S: Prepare a summary of the model updates completed.. For the City of Lakeville this includa
updating the Stormwater System District Analysis (Section 4) of the City's WRMP with results from
the updated model analysis, and preparing a tecillnioaal memorandum for the City of Farmington.
M hodofty
An X P -SWlV M model %gill be c aort l for ewh subwatershed. within the Cities representing a dsdag
(2005) land use conditions and existing storm sewer systems. Prior to creating each XP -SWMM model,
we would review the cu na t subwatershed divides in each of the Cities' respective WRMPs and make
any necessary corrmficu s. The existing land use map that was developed for the VRWJPO model will be
used for this project, and information firm the City's electronic storm sewer database will be used to
supplement the stormweW conveyance system cunantly modeled in the VRWJPO XP -SWMM model.
This data will be input into the models, and the models will be run for the 1-yew, 2-year, 10-year,
50 -year, and loo -year, 4-day storm events to remain ocrosiarent with the storm events used to develop the
VRWJPO standards. This design event hyetograph was developed so that the peals of the storm occurs at
the center with decrushig intensities building out By design, critical storm events with lesser duration
are nested in the overall 4-day event distribution for similar drainage areas. That way only one design
event is required to obtain critical flaws Oroughout the watadied. (i.e., location of a subwalandied in the
drainage network is irrelevant because the critical duration storm event for each subwateished n nested
within the 4 -day precipitatiaut hyetograph).
This methodology is similar to the methodology used to develop the standard SCS Type A 24 -hour stunt
hyetogrsph; thwifore, the 4-day fiequency based design steam developed for the VRWJPO modeling has
a similar peak intensity of the SCS Type 1124 -hour design event and sherr duration frequency based
storms. As a result, the proposed model simulations will test all storm durations without having to
simulate storms of varying durations.
Model results at the municipal boundary will be compared with results from the VRWJPO XP -SWMM
model to vez► that peak discharges and volumes meet co i - , VRWJPO standards. Discrepancies
between results fi m the two models will be addressed or discussed with the City and the VRWJPO.
Proposed storm sewer alignments and planned regional basins fram the Cities current WRMPs will be
added to the XP -SWM M model to develop a future conditions model. Ilic Cities future conditions (2030)
laud use from the Cities 2008 Comp Plan will be reviawed and adjusted if necessary to create
classifications that are similar to those used in the VRWJPO XP -SWMM model. Peak discharge and total
runoff volume at the municipal boundary will be reviewed to verify that model results comply with
current VRWJPO akmdards. Future storm sewer and regional basins will be resiz ed if needed to ensure
they meet VRWJPO standards. If additional basins are required to meet VRWJPO standards, proposed
locations of additional basins will be discussed with the City and will be sized to meet VRWJPO
standards.
After the modeling has been completed, the model description and results will be provided to each City.
Model results for the City of Lakeville will be integrated into the City's WRMP. In the current WRMP,
the 1995 model information is contained in Section 4: Stormwater System District Analysis. This section
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May 15, 2013
Pape 4
will be replaced with updated Md including a district -by- district model description, results, and
recommendations. A discussions of bow the City's modeling is Inftrated with modeling completed by the
VRWJPO and all data tables and figures that changed sa a result of the modeft effiorts will be included
as part of this revision, It is assumed that all updates will be deemed as minor plan revisions that only
require VRWJPO staff review and tie updates will not require approval $om the watecabed boards, the
Mdropolitan Council, the La1mville City Council. or other jurisdictions. A draft will be submitted for
Lakeville staff review and coahment bed it is fin@Hzod.
If new issues or implementation tall® are identified as put of the modeling e8'urt we will discuss
updating Section. 6: Assessment of Issues and Opportunities, and Section 7: Implementation Plan with the
city at that time. However, the scope of work and associated out ibr updating other sections of
Lakeville's WRAP (other than Section 4) will be determined in the hilt and be in addition to the scope
of services de fled in ibis left.
Similarly model mediodolgW, results, and background infounation will be provided to the City of
Farmnigton in a technical memo format. Should the Qty of Farmington decide to update their WRMP
following completion of the modeling effort a cost estivate can be provided
Phase 2: MadelEng of the South Creek Subwatersheds
Our work scope for phase 2 includes the following tasks:
Task 1— Review Subwahmshed Divides and Develop Hydrologic Model Paramefers
Barr will review the current subwatenhed divides for the South Creek Waftibed and update the divides
as necessW to reflect changes in existing drainage patterns. This task does not include subdividing
existing subwatersheds in the Cities WRMP to ON addition9 detail to the XP -SWMM modeL Hydrologic
model parameters will be calculated for all subwateisheds following the acme methodology used to
develop the vermillion River XP -SWMM model.
In locations where subwatetshed divides stop at the municipal boundary, the sabwatesheds from the
VRWJPO model will be used to account for drainage area that flows into each City. These drainage areas
outside the municipal boundary will not be subdivided as part of the model update and wM be modeled
with the acme level of detail as the existing VRW7PO IP SWMM modesl.
Task S — Develop Hydraulic Model Inputs
We will create a water resources inventory, including wetlands, low areas, ditches, storm sewers, culverts,
and other drainage features. This inventory will be completed using data p %dW by the Cities or
relevant information used in the development of the VRWJPO XP -SWMM model. As part of our base
map prepatndon, Barr will review the Cities' electronic storm sewer database to organise information for
input into the XP -SWIIr M model and identify records that are missing the data. The City naming
convention used in tine database provided. to Boa will be used to develop the XP -SWMM model. This
map will be used to identify locations where additional storm sewer informations is needed (La., missing
from the database). As -built plans of crossings will be collected and reviewed; cross section data will be
reviewed and compared to data in the VRWJPO model; and where available high water marlm and rainfall
W:Nnmia UWIW%WRV opaaL171 IW1nn7 .10CityofLihnibSwMMModeNAp MI3=13Mey_BYftMaddhIL-VIAD=
May 15.2015
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data will be reviewed. The model will be a4usted to mimic observed field conditions as app mpriabe using
available data. It is assumed that the Cities will be able to provide the storm sewer data as plan sheets (in
electronic fomaet or as had copies), or will conduct field surveys to collect or verify ia£or mafiam. if
necessary.
Task 3 — Develop lcbdng CondtNoru XP-SW MM Model
Upon receipt of the necessary storm sewer data ftm. the Cities, Barr will ca+eat1 the hydrologic and
hydraulic model of the South Creek watershed rasing the XP -SWMM software. The model will
imorporate casting ( 2005) land use, storm aewa, channel own sections, and detention storage data. The
XP -SWMM model is intended to be a tool for the Cities to identify locations where BMPs are needed to
meet VRWJPO standards, and can be used by the Cities to verify brat future Bbes are sized appropriately
to meet City and VRWJPO rate and volume standards. The model will be run using the 1-year, 2year,
10 -year, 50 -year, and 100 -year 4-day rainfall evauls that were used to define peak discharges =d runoff
volumes for the VRWJPO.
At the municipal boundary, Che up iatea model win be tied to ihhe disking VRWJPO XP.SW M model to
account ftrr downstream tailwatear conditions.
.Additional hypothetical design storm events (i.e., SCS 24 -hour, 10- day Snowmeh Event, etc.) can be
simulated using the XP -SWMM model at the Cities negaest, and will be completed on time and axpmse
in addition to the cost estimate provided for Phase 2.
Task 4 — Develop Future Conditions XP -SWMM Model
Model results will be compared t D VRWJPO standards at the municipal boundary to verify peak
discharge and total ror off volume standards are met. If necessary planned regional basips will be resized.
or added to comply with current VRWJPO standards. The model will be ron using the 1-year, 2 -year,
10 -year, 50-year, and 100 -year 4-day rainfall events that were used to define peak disclarges and runoff
volumes for the VRWJPO.
At the municipal boundary, the updated model will be tied to the cad ng VRWJPO XP -SWMM model to
account for downstream taiilwater conditions. The existing VRWJPO XP -SWMM model will be used for
downstream boundary conditions because it is assumed that curtmt VRWJPO standards will keep future
peak diwlwges and nmoff volumes comparable to mu not conditions.
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Additional hypotbeftW design storm events (Le., SCS 24hou,1 ®-day Snowmelt Event, etc.) can be
simulated using the XP -SWMM model at the Cities request, and will be completed on a time and eapeuse
basis in addition to flue cost estimate provided for Phase 2.
Task 5 — summary of Methodology and Results
The modeling methodology will be summarized for each city. The Soulh Creek subwattushed results,
f genres, and tables will be compiled as part ofthis task, and they will be formatted to be placed fitly
into the Cities WRMP. An electronic (PDF) draft of this docm=4 the figures, sad the tables will be
provided to the Cities for review and comment. Edits to this draft will be incorporated into the final
Section 4 or technical memorandum, completed as part of Phase S.
Task 6 — Project Management
Tbw ttlak includes regular email and other colraspoodence with the Cities during the Phase 2 work
Additionally, two meetings will be held with the Cities during Chia phase of Work am project kick -off
meeting and a second to present initial model results.
Phases S & 4a. Modeling of Remaining Subwatersheds
Phases 3 and 4 will involve similar scopes of wo& to those described in Phase 2, Tasks i &ran h 6 for
the Middle Creek subwatarahed (Phase 3), and the remaining portions is each City (Phase 4). Rather than
reiterate the task descriptions in Phase 2, Table 1 provides a simplified description and proposed costs
associated with Phases 3 and 4.
Phase 5: Updating the City WIMP
The work scope for Phase S includes the following steps:
Task I — Revise Tend and Figures
The watershed and results summaries completed in Phases 1-4 will be compiled as part of" task, and
the comments received in the previous phases will be incorporated. We will submit a draft Section 4 to
the City of Lakeville and VRWJPO staff for review and comment; as well as a draft technical
memorandurn to the City of Farminglom
As part of this task we will review the entire plan and provide a recommendation to the City on other
parts of the plan that should be revised to reflect the updated model results.
Talc 2 — Incorporate Comments and Prepare Final Revised section 4
The City of Lakeville and VRWJPO staff comments will be incorporated into the final revised Section 4,
and City of Farmington comments will be incorporated into the final technical matnorandum. We will
provide the Cities with five hard copies, and one electronic copy. In addition we will provide Lakeville
with one electramnc copy of the entire plan with the revised Section. 4 incorporated.
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May 15.2013
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Task 3 (OpRonad) — Revise AddNlonal WRMP Sections
It is possible that the model results and revisions to Section 4 may affect other sections of the City's
WRAD. For example the updated modeling may show additional areas of flooding dW should be
discussed in another section. A detailed scope of work and cost estimate for this task will be provided
upon completion of Phase 4, Task 1, when we are able to determine it and W what extent; the updated
modeling affects other sections in the current City WRMP.
Tcmk 4 — Project Mwagennent
This task includes regalar amail and othex cerreapomdence with the Cities during the Phase 5 work, as
well as one meeting to discuss comments on the revised Section 4 and fmal tacknical mtmioraudum.
Table 1— Pleases 24 Estimated Engineering Services Schedule and Cost
'Assumes suftwhation of all phases by June 1. 2013. The protect schedule will be w*misd as need N autha 1 11 a dalarw.
= VWMP addendum for the Clly of LakwAis or summary d roaalls from al phaaee for the O ty of Fannkom. Exdudm o *wW
T ask 3.
3 Co 1 p�Won data depende on wh or the updated modal Is used or the VRWJPC modal b used to co mplaba the waluidon of
Thank you for this opportunity. We look forward to continuing to assist your City develop a
hydrologic model that can be used by the Cities for stormwater planning and cocrdinatiom
with the VRWJPO. If fie proposed 4ustments to file project sc cWc and budget estimates (to awn the
implications of Atlas 14 and reflect the postponement of Phase 2-5 from 2011 to 2013) are acceptable,
please let us know when work can begin. In an effart to meet the revised whadale the work should begin
as soon as possible. Please contact me at 952- 832 -2755 at Brandon Barnes at 952-832-2737 if you have
qurticros.
Scott Sobicch, PE, CFM
Vice President
Brandon Barnes, PE
Nect
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Phase
South Crook
$51,200
$24.604
December, 2013
Phase 3
Middle Creek
$24,1800
$46=
February, 2014
Phase 4
Remaining Watersheds
$46,500
$41,gOp
March, 2014
Phase 5
Summario Result
$16.104
$11,100
April, 2014
Subtotal
$138,800
$119,400
Alm 14
$5,600
$5,600
see Note 3
Total
$144,100
;124,900
'Assumes suftwhation of all phases by June 1. 2013. The protect schedule will be w*misd as need N autha 1 11 a dalarw.
= VWMP addendum for the Clly of LakwAis or summary d roaalls from al phaaee for the O ty of Fannkom. Exdudm o *wW
T ask 3.
3 Co 1 p�Won data depende on wh or the updated modal Is used or the VRWJPC modal b used to co mplaba the waluidon of
Thank you for this opportunity. We look forward to continuing to assist your City develop a
hydrologic model that can be used by the Cities for stormwater planning and cocrdinatiom
with the VRWJPO. If fie proposed 4ustments to file project sc cWc and budget estimates (to awn the
implications of Atlas 14 and reflect the postponement of Phase 2-5 from 2011 to 2013) are acceptable,
please let us know when work can begin. In an effart to meet the revised whadale the work should begin
as soon as possible. Please contact me at 952- 832 -2755 at Brandon Barnes at 952-832-2737 if you have
qurticros.
Scott Sobicch, PE, CFM
Vice President
Brandon Barnes, PE
Nect
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