1i. Storm Sewer Management Proposal from Enviroscience, Inc. 1 , '
OTYOF
C HANHASSEN
690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317
(612) 937-1900
' MEMORANDUM •
TO: Don Ashworth, City Manager
' FROM: Gary Warren, City Engineerw5, . 4--6 -E�l
DATE: April 5 , 1989
' SUBJ: Accept Storm Sewer Management Proposal from :..i_s0-•
Enviroscience, Inc . f
File No. PW201B
' As you are aware, the Administrative Trust Fund includes a
$15 , 000 budget item for storm water management comprehensive
planning. To my best recollection, the only portion of the City
which has had the benefit of comprehensive storm water management
planning has been the downtown redevelopment area. The lack of a
comprehensive plan places staff in a very difficult position when
asked to review subdivision proposals and forces us to require
' on-site ponding and other remedial measures within the sub-
division to deal with storm water conveyance and nutrient
control .
While $15 , 000 will not allow us to fill in all of the gaps of the
City, we have scoped this element to include the remaining por-
tions of the Riley Creek watershed as shown on the attached map.
' This is a prime area where we are experiencing, and anticipate
experiencing, continued development in the future. This also
correlates with the Chain of Lakes project and will fit nicely
with the corrective measures which hopefully will be undertaken
under the state funded Chain of Lakes program.
' This will be a fees for service contract. As such, I have con-
tacted the firm of Enviroscience, Inc. who has been active in the
Trunk Highway 212 environmental impact statement preparation and
is familiar with our area to submit a proposal for our con-
sideration. I have attached excerpts from this proposal which
are pertinent to this study. The consultant' s estimated fees for
this service is $13 ,500 with the understanding that the study
' will not elaborate on the Chapter 509 watershed requirements
since this is an element which we intend to budget for next year
for the entire City. I have found Enviroscience ' s services to be
very responsive and technically sound and their fees have been
' very reasonable.
Don Ashworth
April 5 , 1989
Page 2
It is therefore my recommendation that the firm of Enviroscience,
Inc. be authorized to prepare the City ' s next element of the
storm water management plan as notea in the attached scope of
services .
Attachments
1 . Budget excerpt. '
2. Storm water management study proposal.
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, FUND: ADMINISTRATIVE TRUST
DEPARTMENT: GENERAL ADMINISTRATION
II 1989 BUDGET
I Commentary
Function: To act as a trust fund for expenses anticipated to occur in pro-
viding services to special assessment improvement projects, administering debt
I service accounts during the period of assessments, and to help in the purchase
of major pieces of equipment/capital expenditures.
Expenditures:
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General Comment: The concept of "transfers" from this fund to the General
Fund has been eliminated. This change is in keeping with the general policy
I statement of the Council in 1983 to eliminate transfers to the maximum extent
possible, i.e. establishing total costs within one control center.
Secondarily, the City must maintain the integrity of the General Fund in future
I years while providing a means by which special consultive or major capital
purchases can be made which are typically beyond the scope of the general
operating departments. As the revenues of this fund cannot be assured in
II future years, it should not be considered as a continual revenue source of the
General Fund. However, if properly managed, sufficient monies should exist in
this fund to assure the City Council of a means by which special consultive
reports/major capital purchases can be budgeted without distorting the general
Ioperating expenditures of the City.
Expenditures include: 1989
I 4010 - Project Engineer 100%
Engineering Tech 100/
II 1987 1988 1989 1990
Fees, Service:
gp Storm Water Comprehensive Plan C15,OC`�O� 30,000
Engineering Services 60,000 40,000 60,000
II EIS for T.H. 212
TH 5 Acceleration 10,000 10,000 10,000
15,000 15,000 20,000
Highway 101 Realignment 40,000
II Codification (Carried from 84) 2,000 0 0
Zoning Ordinance 5,000 0 0
00
Auditing 7,000 8,000
9,000
City Attorney - (Codification) 1,000 0 0
I Highway 7 Study 5,000 0 0
Highway 212 Study 0
0 7 500
Data Processing Services 7,500 0 0
I Comprehensive Plan (Koegler) 5,000 5,000 5,000
General Fixed Asset System 0 0 5,000 3,000
Development Framework ^,000 2,000 0
II Computer Training ^1,600 2,000 2,000 2,000
Staff Dev. Training 5,000 5,000 5,000 5,000
Community Center _0,000 6,000 A
61,100 153,000 113,500 130,000
I Printing & Publishing
Comprehensive Plan 2,500
I Capital Equipment:
Computer Replacement/Upgrade 11,800 7,000 6,000
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STORM WATER
MANAGEMENT
STUDY
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PROPOSAL SUBMITTED BY:
ENVIROSCIENCE, INC. '
8951 WEST 36TH STREET, SUITE H
MINNEAPOLIS, MINNESOTA 55426
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JANUARY 1989 '
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! / I `! l i'1 l; :\ /�\1-
NU(
Consulting Engineers & Land Surveyors
SUITE H 8951 W 36th STREET
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MINNEAPOLIS, MINNESOTA 55426
(612) 932-9757
January 31, 1989
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i Mr. Garry G. Warren, P.E.
City Engineer/Public Works Director
City of Chanhassen
690 Coulter Drive
Chanhassen, Minnesota 55317
' Dear Mr. Warren:
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Thank you for the opportunity to submit this proposal to you to perform a stormwater
,,1 management plan for a portion of the City of Chanhassen.
Dennis Kim, Jon Bogart and Gary Peterson have been involved in a number of stromwater
management plans and drainage studies. Our personnel have extensive experience in the
fields of hydrology and hydraulics.
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We at Enviroscience, realize the importance of personal attention and the need for project
cohesion and coordination. Project management will be executed by Dr. Kim. Jon Bogart
will act as project engineer. Our size, tight project management, and quality control allows
us to be responsive, efficient and most cost effective.
If selected, Enviroscience will be responsible for the total project, including data gathering,
computer model analysis, hydrologic and hydraulic investigations and analysis, coordination
with governmental agencies, meetings, preparation of draft and final stormwater
management plan.
We believe our recent work on the T.H. 212 Environmental Impact Statement in
Chanhassen will aid in the rapid completion of this project.
Again, thank you for considering us for this project. If you have any q uestions or need
additional information, please call us.
Sincerely yours,
K. Dennis Kim, Ph.D., P.E.,
' President
KDK:ln
' Enclosures
ENGINEERING EXCELLENCE BY ANY MEASURE
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L I. GOALS
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GOALS OF STUDY
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To prepare a Storm Water Management Plan for the City of Chanhassen to assist the city
staff for future development plans and to meet the requirements of Act 509, Section 22
Minnesota Statutes. This study will address:
IA. The existing and proposed P h Y sical environment and land use of the
specified study area.
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B. Define the drainage areas and the volumes, rates, and paths of
stormwater runoff.
C. Identify areas and elevations adequate to meet stormwater storage
performance standards established by Riley Creek, Minnehaha Creek,
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Bluff Creek, and Purgatory Creek watershed districts.
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D. Define water quality standards and water quality protection methods
adequate to performance standards as set forth by the respective
Watershed District.
E. Identify all protected and regulated wetlands and waterways.
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F. Produce an implementation program including a description of official
' controls and a preliminary capital improvement program for the storm
drainage system.
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G. Inventory existing stormwater drainage facilities in the study area.
H. Identify existing problems and potential future problems with the stormwater
drainage system.
I. Identify existing and potential stormwater detention areas.
J. Identify potential methods to reduce nutrient loading of stormwater runoff
leading to Christmas Lake and Lake Riley.
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II. STUDY AREA 1
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III. PROPOSED WORK PLAN
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' { PROPOSED WORK PLAN
1. Collect Available Data
I } A. Collect all available mapping of the study area, including aerial mapping and
1 photography from city contractor, U.S.G.S. Quadrangles, county soil maps, -
current city street maps, Fish & Wildlife Service wetland maps.
B. Collect information from the City of Chanhassen to include: new subdivisions
I not shown on existing mapping, zoning information, master plans, existing and
proposed drainage ways, ditches, storm sewers that impact on the study area.
C. Collect information from existing Flood Insurance Studies, Environmental
Assessments Worksheets, Environmental Impact Statements, and wetland
evaluation worksheets.
3 D. Meet with MPCA, MDNR, affected watershed districts, and other
governmental agencies to address their concerns with water quality and
quantity.
I 3 E. Meet with City of Chanhassen officials to discuss future needs and existing
problems with storm water quality and quantity.
2. Assemble Data into a Meaningful Form:
' A. Divide the watershed into several subwatersheds (drainage areas) using the
prepared general topographic maps.
B. Determine the existing and proposed times of concentration using soils, land
use, area, length, slope and storage coefficients.
' C. Determine a rainfall design storm and runoff for each subwatershed.
D. Prepare a watershed and subwatershed map showing the existing waterways,
sewer lines, lowlands, wetlands, temporary and permanent storage ponds.
E. Identify on the watershed and subwatershed map the volumes, rates and paths
of stormwater runoff.
F. Identify existing problem or potential problem areas already constructed that
will be affected by the increased flow from additional urbanization.
G. Select an appropriate hydrologic model for the entire watershed, i.e., the SCS's
Technical Release No. 20 (TR20), Project Formulation Program -- Hydrology,
or the U.S. Army Corps of Engineers Flood Hydrography Package, HEC-1.
NB
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H. Select various and appropriate, design storms; for example the 100-year, 6- 1
hour and 24-hour, and the 10-day snow melt events. These design storms will
be used in the computer program, for overall simulation of the watershed.
iI. Assess the flooding problems in each subwatershed under the existing
condition. g
1. Determine the critical design storms and snow melt.
2. Estimate runoff hydrographs (discharge rates) for each subwatershed for
existing and proposed ultimate conditions.
J. Assess the watershed flooding and soil erosion problems for the proposed ,
ultimate conditions through the developed and underdeveloped areas and the
erosion and sedimentation problems in the various ditches.
K. Identify structural and non-structural flood control alternatives to reduce or
eliminate the potential flooding and soil erosion problems, including: retention
ponds, channel cleaning and alignment, ditch restoration and reconstruction, '
restrictive land use, purchase of land frequently flooded, adjustment in stream
crossings, culverts and bridges, etc.
L. Identify the most cost-effective flood control measures which are compatible
with the city's policies and objective.
M. Estimate the runoff coefficients for the developed and undeveloped areas.
N. Recommend optional and feasible operational and management policies, rules,
and regulations to implement a comprehensive drainage plan within the city
1 compatible with community development programs. To be included with the
recommendations will be a proposed capital improvement plan consistent with
long-term city needs.
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VI. LIST OF RELATED PROJECTS
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LIST OF RELATED PROJECTS I
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Hydrologic Model of Coon Creek Watershed District
Enviroscience, Inc. conducted a comprehensive rehensive h droloa' I
P hydrologic and hydraulic study of the Coon
Creek Watershed District. The purpose of the study was: (1) to assess the existing
management and flooding problems in the district; (2) to assess the existing policies of the
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1 Watershed District Board and the rules and regulations of the Minnesota Department of
Natural Resources; (3) to develop a detailed but integrated water management program to
minimize flood damages and allow land development in the district.
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i Enviroscience developed three mathematical models for the entire watershed and its
waterway system using HEC-1, HEC-2 and TR-20. These models will be used as a
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management tool to assist the board of managers in their policy and decision-making. The
models also simulate lake level variations and their impact on downstream communities.
The impact of various flood control measures in reducing expected flood damages were also
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Hydrologic and Hydraulic Study for Sandoz Nutrition, St. Louis Park, Minnesota I
Enviroscience, Inc. recently completed a hydrologic study for the Sandoz Nutrition
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Corporation. The '1'R-20 computer program was used to model the effects of converting
natural wetlands and fill areas to impervious parking lots and roof tops. Flood flows were
1. routed using TR-20. Flood plain elevations were estimated and storage ponds were
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designated to minimize the effects of the proposed development on the urban area. Existing
storm sewer systems were examined to determine the best routes for the runoff.
j__ Sediment Transport Study, Coon Creek--Anoka County, MN.
{ The mechanics of sediment transport was investigated for Ditch 58 and Sand Creek in the I
( _ Coon Creek Watershed District. The waterways were analyzed for deterioration of the
channel and banks from erosion, and bank stability. Recommendations were made for
1 proper erosion and deposition control.
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Hydrologic Study of Sand Creek Watershed near Jordan, Minnesota
IAdischarge frequency curve, using the HEC-1 computer model, was developed for Sand
Creek upstream of U.S. Highway 169 at Jordan, Minnesota. This work included the
computation of the 10, 25, 50, 100 year and Standard Project Flood hydrographs at this
location. Additionally, other techniques were used to develop discharge frequency curves
' for comparison. These were the S.C.S. peak-flow discharge method, U.S. Geological Survey
regional regression equations, and the Minnesota Department of Transportation regional
discharge frequency equation. The St. Paul District of the U.S. Army Corps of Engineers
I 1 has used the study to design flood protection structures for the city of Jordan, Minnesota.
Wetland, Fish & Wildlife Analysis for a New Trunk Highway 212
Enviroscience, Inc., has prepared a technical report describing existing conditions of
wetlands, fish and wildlife for a proposed T.H. 212 in Carver and Hennepin Counties.
Potential impacts and mitigation measures to wetlands and wildlife were studied in detail.
This technical report was a part of a comprehensive Environmental Impact Study (EIS) for
Ithe proposed project.
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IPengilly Expressway (T.H. 169) - Itasca County, MN.
As part of the EIS, Enviroscience, Inc. studied the impacts of highway runoff on
watercourses near T.H. 169. The regional hydrology was studied, the impact from roadway
salt was asessed, and a preliminary drainage system design was prepared.
' Hydrologic Study for Village Chevrolet, Wayzata, Minnesota
I! The TR-20 computer program was used to determine design flows and volumes for sizing
storm sewers and sedimentation ponds for a proposed expansion of Village Chevrolet. The
site will experience extensive regrading and the addition of impervious surface area. Storage
' ponds and outlet structures were designed to minimize impacts from increased peak flows
and runoff volumes on local wetlands and neighborhoods.
' Watertown, South Dakota for the Federal Emergency Management Agency
Enviroscience, Inc., performed topographic and ground control surveys of Watertown, South
' Dakota for the Federal Emergency Management Agency. Horizontal and vertical control
- data were utilized to produce a two-foot contour map for portions of the city by Markhurd,
Inc. Channel cross-sections and profiles of the hydraulic structures on the Big Sioux River
,} were determined by Enviroscience.
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Hydrologic Model of Redwood and Cottonwood River Watersheds '
The St. Paul District of the U.S. Army Corps of Engineers, in conjunction with the Soil
1 Conservation Service, awarded Enviroscience with two contracts to calibrate the S.C.S. 'TR-
20 computer program to the 1.25, 2, 5, 10, 25, 50, 100, 200, and 500-year, and Standard
P P g y ,
Project Floods in the Redwood and Cottonwood Rivers in southwestern Minnesota. These
models rerouted the rivers through several lakes,31 earthfilled dams, and incorporated 1000
square miles of drainage in each basin. Both watersheds consist mainly of farmland
containing many types of soils, which were included as variables in the hydrologic model.
Also included in the model were cross over-flow from one basin to another, soil type,
channel condition,velocity in reach and each subbasin area. The Soil Conservation Services
uses both models as a management tool.
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Hydrologic and Hydraulic Design of Waterfowl Production Areas in North Central
Minnesota ,
The purpose of this project was to design hydrologically adequate and hydraulically stable
dikes and outlet structures for waterfowl production. This requires fairly constant water
surface elevation for waterfowl and prevention of flooding of adjacent lands. The '1'R-20
computer program was used to computer peak flows and hydrographs of the 10, 20, 50 and
100-year rainfall events. This information was then used to design earthen dikes, culverts
and grassed channels to provide stable waterfowl habitat. After the work was completed
by Enviroscience, Inc., the U.S. Fish and Wildlife Service implemented the most practical
plan. '
Anoka-Champlin Bridge Environmental Impact Statemment
Enviroscience is currently working with az team of consultants on an Environmental Impact
Statement for the proposed new Mississippi River crossing of T1H. 169 between Champlin
and Anoka, Minnesota. Areas of responsibility include water quality, flood plain, fisheries,
wildlife and wetlands anaylsis.
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VII. RESUMES
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K. DENNIS KIM, CIVIL ENGINEER, PH.D., P.E.
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Education: University of Minnesota, Ph.D., Civil Engineering 1976 -
University of Minnesota, M.S., Fluid Mechanics 1972
Memberships: American Society of Civil Engineers
Chi Epsilon Honorary Civil Engineering Society
National Society of Professional Engineers
Society of American Military Engineers
Minnesota Ground Water Association
Experience: Dr. Kim has over 15 years experience in the development and 1
application of hydrologic and hydraulic model for various sites of
watersheds. 1
Dr. Kim's recent experience includes the following projects:
Comprehensive watershed study for the Coon Creek Watershed 1
District in Anoka County. Determination of existing and
future flood conditions and potential alternatives were
identified and studied. Water quality and sediment problems
studied.
Water management study for Wara Real Estate in Minnetrista, 1
Minnesota. The study included determination of flows for
different frequencies and design of ponds and outlets.
- Drainage study for Village Chevrolet in Wayzata, Minnesota.
Study of drainage system and design of outlet structures and
water quality control ponds.
Project Manager for the Flood Insurance Study (FIS) for the
{ Federal Emergency Management Agency for the City of
( . Watertown, South Dakota. This study involves extensive
hydrologic and hydraulic analysis of the Big Sioux River, Roby
Creek, Lake Kamapeska, and Lake Pelican. Frequency 1
analysis and the HEC-1 computer program were used for
comprehensive hydrologic modeling, and the HEC-2 program
was used for hydraulic modeling. 1
- Project Manager for the development of TR-20 models for the
Redwood River and the Cottonwood River Basins in
Minnesota. Utilized Log-Pearson Type III frequency analysis
to determine flood flows for different return periods.
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K. DENNIS KIM, CIVIL ENGINEER, PH.D., P.E. - Continued
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Project Manager for the development of an HEC-1 model for
Sand Creek at Jordan, Minnesota. Snyder's unit hydrograph
method was utilized to compute peak discharges.
I - Design of storm sewer, sanitary sewer parking lot and
pavement for the U. S. Post Office in Forest Lake, Minnesota.
II - Feasibility study and preliminary design of water supply system,
storm and sanitary sewers for Northaven Residential
IDevelopment in Blaine, Minnesota.
- Feasibility study, preparation of plans and specifications,
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' construction management, construction surveys and inspection
f for a new water main and distribution system for a prison
facility in Duluth, Minnesota.
I - Drainage Study and Design for Sandoz Nutrition in St. Louis
Park, Minnesota. The project included study of drainage
conditions in the project area and design of storm sewers,
I outlet structures, and ponds for peak flow and water quality
control.
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