HomeMy WebLinkAbout6.l. Broackway Property Environmental Assessment Worksheet (EAW), City Project #381CITY OF ROSEMOUNT
EXECUTIVE SUMMARY FOR ACTION
CITY COUNCIL MEETING DATE: February 3, 2004
AGENDA ITEM: Brockway Property Environmental Assessment
A SECTION:
Worksheet (EAW), City Project #381
4Consent
PREPARED BY: Andrew J. Brotzler, P.E., City Engineer
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ATTACHMENTS: Cover Memo; Draft Environmental Assessment
APPROVED BY:
Worksheet for Brockway Property
The attached documents contain information regarding the Brockway Property Residential
Development Environmental Assessment Worksheet (EAW). The EAW is being submitted to
the City Council for authorization to distribute the EAW for a 30 -day public comment period.
The purpose of this EAW is to identify potential environmental impacts associated with the
development and determine whether or not an Environmental Impact Statement (EIS) is
required. An EIS is a more extensive environmental review process.
This item is before the City Council for review and authorization to distribute the EAW for the
30 -day public review and comment period.
Memorandum
To: Honorable Mayor and City Council, City of Rosemount
From: Andi Moffatt, WSB & Associates, Inc.
Date: January 21,2004
Re: Brockway Residential Development
Environmental Assessment Worksheet
WSB Project No. 1556 -03
Attached, please find a draft copy of the Environmental Assessment Worksheet (EAW) for
the Brockway Residential Development for your consideration at the February 3, 2004 City
Council meeting. The purpose of the EAW is to identify potential environmental impacts
associated with the project and determine whether or not an Environmental Impact
Statement is needed. Based on Minnesota Rules 4410.4300, the EAW for this project is
mandatory due to the size of the proposed residential development. The EAW process is
required to be completed prior to the City issuing any approvals for this project.
The City Council is asked to authorize public distribution of the EAW as required by
Minnesota Rules 4410. Upon authorization, the EAW will be distributed for a 30 -day public
comment period. At the end of the comment period, responses to comments will be
developed and a recommendation as to the need for an Environmental Impact Statement will
be made to the City Council for consideration.
If you have any questions, please feel free to call me at (763)287 - 7196.
C. Jamie Verbrugge, City Administrator
Rick Pearson, City of Rosemount
Andy Brotzler, City of Rosemount
Dave Hempel, CPDC
Bill Weber, CPDC
F:1 TN 03W12104hmcc.doc
Minneapolis St. Cloud • Equal Opportunity Employer
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Brockway Residential
Development
RGU:
EQB Publication Date: February 16, 2004
EAW Comment Deadline: March 17, 2004
City of Rosemount
Rick Pearson
2875 145th St. W
Rosemount, MN 55068
WS B
& Associates, Inc.
WSB Project No. 1556 -03
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ENVIRONMENTALAsSESSMENT WORKSHEET
Note to preparers: This form is available at www.mnplan.state.mn.us. EAW Guidelines will be available
in Spring 1999 at the web site. The Environmental Assessment Worksheet provides information about a
project that may have the potential for significant environmental effects. The EAW is prepared by the
Responsible Governmental Unit or its agents to determine whether an Environmental Impact Statement should
be prepared. The project proposer must supply any reasonably accessible data for — but should not complete
— the final worksheet. If a complete answer does not fit in the space allotted, attach additional sheets as
necessary. The complete question as well as the answer must be included if the EAW is prepared electronically.
Note to reviewers: Comments must be submitted to the RGU during the 30 -day comment period following
notice of the EAW in the EQB Monitor. Comments should address the accuracy and completeness of
information, potential impacts that warrant further investigation and the need for an EIS.
Tables, Figures, and Appendices attached to the EA W.
• County map showing the general location of the project
' • United States Geological Survey 7.5 minute, 1:24,000 scale map indicating project boundaries
(photocopy acceptable)
• Site plan showing all significant project and natural features
TDD (for hearing and speech impaired only): (651) 282 -5332
' Printed on recycled paper containing 30% fibers from paper recycled by consumers
1 Pro,ec T><tle rc�cwa Resiclertia IeveTopanent >' L Z.
These items are attached in Appendix A and B.
I Description:
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a Provd a proect,snrrmaryf Std Qrds o ess to pubshean the tV1�ndr ._ „ ,
The City of Rosemount has prepared an EAW for the Brockway Residential Development. This
development includes construction of 86 single - family homes, three 60 -unit apartment buildings of
which 1% will be senior housing, and 346 town home units, as well as a 15,000 SF of a Neighborhood
Commercial area on approximately 106 acres located south of County Road 38, and east of State
Highway 3 (South Robert Trail).
Contractor Property Developers Company (CPDC) is proposing a mixed use residential development
consisting of 612 total units. Housing types will consist of single and multi - family residential. Several
outlots are proposed on the project site. One outlot will consist of up to 15.0 acres of dedicated city
park, a storm water pond, a ball field, and a trail that will be connected to a trail system.
The site currently contains 106 acres of a 9 -hole golf course, club house, maintenance shed, and
500,000- square foot warehouse and former glass - manufacturing furnace room with associated paved
parking and landscaped areas. Approximately 2 acres of County Road Right of Way is located on the
north side of the site. Currently there is 0.94 acres of ponding on site. After construction, the site will
include approximately 35 acres of lawn/landscaping and private open space, trails, and park, up to 15
acres of dedicated city park which includes a ball field, 41 acres of impervious surfaces, and 5 acres of
total ponding area. It should be noted that the cover type amounts are only estimates and are subject to
change as part of the plan review process.
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Prior to redevelopment of this site, the existing factory and warehouse will be demolished. All
associated debris from the demolition of the existing buildings will be disposed of according to state and
local guidelines and requirements.
Project construction is anticipated to begin in May 2004 and be completed in September 2010. The
ultimate development schedule will depend on market conditions.
Brockway Residential Development
Rosemount, Minnesota
1/8/04
Environmental Assessment
Worksheet
The Brockway Residential Development site is bordered on the north by County Road 38 (Bonaire
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Path), on the south by Connemara Trail, on the west by State Highway 3, and on the east by the Chicago,
Milwaukee, St. Paul, and Pacific Railroad. The site is anticipated to be graded in several phases to
install sewer and water, construct streets, and building pads. Prior to the commencement of each site
grading operation, erosion control and other Best Management Practices will be implemented. The
grading plan will incorporate approximately 4 additional acres of on -site ponding for storm water
treatment and rate control to provide a total of approximately 5 acres of ponding. Erosion control
measures will remain in place until all construction on -site is completed and the site is stabilized.
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Permanent erosion control measures include ponding and landscaping.
The construction methods are anticipated to be the conventional earthwork methods for site grading that
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include earthmoving scrapers, bulldozers, backhoes, and vibratory compactors. The public utilities will
also be constructed with conventional practices utilizing backhoes, bulldozers, and compactors for
excavation and backfill in the utility trenches.
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Prior to redevelopment of this site, the existing factory and warehouse will be demolished. All
associated debris from the demolition of the existing buildings will be disposed of according to state and
local guidelines and requirements.
Project construction is anticipated to begin in May 2004 and be completed in September 2010. The
ultimate development schedule will depend on market conditions.
Brockway Residential Development
Rosemount, Minnesota
1/8/04
Environmental Assessment
Worksheet
Outlots are included in the development and will contain park, storm water ponds, open space, and trails.
These outlots will remain as open space and park and will not be developed in the future.
Not Applicable
Unit of Government Type of Application Status
State
MPCA Review / Approval of a To be obtained
Construction Contingency
Plan/Response Action Plan
MPCA SDS Permit To be obtained, if needed
Brockway Residential Development Environmental Assessment
Rosemount, Minnesota 3 Worksheet
1/8/04
The purpose of the project is to provide residential housing within the City of Rosemount. A
government unit is not carrying out this project
*Neighborhood commercial
The Concept Development plan for the project site details the lot sizes and locations related to the
ponds and open space. A copy of the plan is included in Appendix B.
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MPCA
NPDES Phase lI Storm Water
To be obtained
Permit
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MPCA
Sanitary Sewer Extension Permit
To be obtained
Minnesota DNR
Water Appropriation
To be obtained, if needed
Minnesota Department of Health
Water Main Extension Permit
To be obtained
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City/Local
Met Council
Comprehensive Guide Plan
To be obtained
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Amendment
Met Council
Sanitary Sewer Extension
To be obtained
Dakota County
Review Construction
To be obtained
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Contingency Plan/Response
Action Plan
Dakota County
Access Permit
To be obtained
City of Rosemount/Dakota County
Platting
To be completed
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City of Rosemount
Building Permits
To be obtained
City of Rosemount
Site Plan Review
To be completed
City of Rosemount
WCA Permit
To be obtained, if needed
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City of Rosemount
Grading Permit
To be obtained
City of Rosemount
Rezoning Approval
To be obtained
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Recent land use in the project area is a recreational 9 -hole golf course with associated clubhouse and
maintenance shed and a warehouse facility. Past land use in the project area included agricultural use
until the late 1950s - early 1960s. The Brockway Glass manufacturing plant and associated 500,000 SF
warehouse and furnace room was established in 1964. Presently the warehouse structure is utilized by
Wintz Trucking. Residential housing is located adjacent to the project site to the north and west, and a
Multi - family mobile home park is located to the south.
Based on information from the MPCA, Dakota County, and the Phase I Environmental Site Assessment
(ESA) Update (7/03), the following potential and known pollutants have been identified on the site (see
Appendix A for pollutant location map):
• DUMP/Volunteer Investigation and Cleanup Site (VIC) owned by Brockway Owen Glass under
a restrictive covenant by MPCA
• closed LUST site which may contain residual contamination
• high levels of diesel fuel organics identified in the northern most pond on the southwest side of
the site in 1999 that is recognized as an environmental condition
• Unpermitted dumpsite containing grass clippings and other garden waste, and possibly other trash
and /or contaminants reported to Dakota County through citizen complaints
' • demolition and removal of the warehouse, factory, and associated hazardous materials such as
asbestos and contaminated electrical equipment
• two above ground storage tanks with no secondary containment
' Brockway Residential Development Environmental Assessment
Rosemount, Minnesota 4 Worksheet
1/8/04
The Farmland and Natural Area Protection Plan for Dakota County illustrates the general vicinity of this
site on the Generalized Land Cover map as grassland and woodland. Areas within the vicinity of Keegan
Lake are classified as "Privately Owned Natural Areas" on the Dakota County Hybrid Natural Area
Protection Scenario map.
' • the P resence of floor drains and an oily il substance in the building indicating possible
contamination underneath the building site due to leaking pipes from the drains and the oil /water
' separator
The ESA Update recommends a Response Action Plan (RAP) be prepared and approved by MPCA prior to
initiating redevelopment activities in this site. Additionally, the ESA Update recommends incorporating a
construction contingency plan to deal with removal of contaminated soil and/or groundwater if identified
after removal of the 500,000 SF building and removal of any residual pollutants within the location of the
LUST incident, retention ponds, and surrounding areas. The Brockway Glass Dumpsite is currently in the
VIC program and was capped, remediated and may not be disturbed. Development in and around this area
may be approved by MPCA and is subject to their mandate as long as it does not disturb the area.
' The City of Rosemount met with representatives of Contractor Property Developers Company (CPDC),
MPCA, and Dakota County on January 14, 2004 to discuss these issues and determine actions that would be
needed on the site. CPDC anticipates working with the MPCA and Dakota County to address these issues
either through implementation of a Construction Contingency Plan or Response Action Plan. It is
anticipated that CPDC will enroll in the VIC and VPIC (Volunteer Petroleum Investigation and Cleanup)
' programs to implement cleanup of known pollutants and pollutants identified through further investigation
of the site during the construction phase of the project.
The City of Rosemount 2020 Comprehensive Plan has designated the project site as a combination of Parks
and Open Space, and Business Park. The area will be required to be re -zoned and re- guided to a
combination of urban and high density residential to reflect the different housing types proposed in the plan
as well as the small commercial site. The property is currently zoned B -P2 (Business Park -2) and PI (Public
i Institutional) and will be re -zoned to a combination of R -1, R -2, R -3, and CI. The proposed density and re-
zoning will be reviewed by the City as part of the plan approval process.
' Several of the proposed single family home units will be located adjacent to the active railroad that borders
the site on the east - southeast. This presents the potential for incompatible land uses based on the noise and
visual impacts associated with the railroad. Appropriate mitigative measures, such as adequate landscaping
to screen the housing units from the railroad, will be required by the City. This will be reviewed as part of
the plan approval process.
Williams Pipeline Company has a petroleum pipeline which extends east to west in the southern half of the
property. The 100' wide pipeline easement is documented as #637707. The project plan illustrates the
approximate location of the pipeline within the project site and proposes to locate the trail along this
easement. Northern States Power Company has a 50' wide easement documented as #972787 and located
on the north east side of the site. A copy of the site plan is included in Appendix B. The power line and
gas line easements are also illustrated on the Well Location Map (Figure 5) in Appendix A.
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Brockway Residential Development
Rosemount, Minnesota
1/8/04
Environmental Assessment
Worksheet
Note that these areas are estimates and may change during the plan review process.
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The development plan incorporates approximately 15 acres of public park, a combination of 10 acres
of private parkland, open space and trails, and a total of 5 acres of ponding. These areas will
provide habitat and corridors for wildlife adapted to living in urban settings.
The wildlife on this site is a result of the plant communities present. The three prominent plant
communities on and adjacent to the project site include wetlands and ponds, wooded/forested and
grassland areas, and sodded turf (golf greens).
Brockway Residential Development Environmental Assessment
Rosemount, Minnesota 6 Worksheet
1/8/04
Ponds /Wetlands
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The City of Rosemount's Comprehensive Wetland Management Plan identifies two Manage H
wetlands and one Utilize wetland located within the property boundaries. The Manage II wetlands
provide some functions for vegetative diversity and wildlife habitat with high functions for water
quality protection and flood attenuation. An aerial photo review of the site was performed to
determine if the ponds were constructed. Aerial photos between 1940 and 2001 were reviewed. In
all years reviewed, the pond located on the north boundary of the site was present. Review of the
ponds located on the southwest boundary of the site was inconclusive due to the amount of trees
present in this area. Historical accounting of these ponds with previous property owners indicates
that they have been used as stormwater and effluent treatment ponds since the late 1950s / early
1960s when the glass factory was constructed. The classification of these wetlands will be evaluated
by the City as part of the review process of the proposed development plan.
The City's Wetland Management Plan requires sediment pretreatment for Manage H wetlands. The
Utilize wetland has the highest functions as a water quality protection and flood attenuation wetland.
It does not generally provide high quality wildlife habitat. The City's Wetland Management Plan
does not require treatment for Utilize wetlands.
Wooded/Forest and Grassland/Brush
The wooded and grassland/brush areas are found in the southwest and southeast corners of the
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property. The dominant species within the tree strata is oak, pine, and Russian olive. These species
provide an ecological function to the area by reducing the impact of soil erosion and by providing
cover for deer and other wildlife. However, the tree stratum does not function as a significant
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ecological corridor for most wildlife since it is relatively small and Connemara Trail abuts this area
to the south and Highway 3 to the west. The development plan has identified park and open space in
the wooded areas of the site and many of the existing trees are not anticipated to be removed from
the southwest corner of the site.
Wildlife
Wildlife typical of wooded areas includes white - tailed deer, geese, pheasants, ducks, rabbits, birds,
turtles, frogs, gophers, chipmunks, mice, raccoons, and squirrels. These animals are believed to be in
the vicinity of the project site. Deer tracks were observed during the site visit in December 2003.
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The development plan incorporates approximately 15 acres of public park, a combination of 10 acres
of private parkland, open space and trails, and a total of 5 acres of ponding. These areas will
provide habitat and corridors for wildlife adapted to living in urban settings.
The wildlife on this site is a result of the plant communities present. The three prominent plant
communities on and adjacent to the project site include wetlands and ponds, wooded/forested and
grassland areas, and sodded turf (golf greens).
Brockway Residential Development Environmental Assessment
Rosemount, Minnesota 6 Worksheet
1/8/04
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Based on the DNR Natural Heritage Database and site visit, there are no known endangered or rare
species on or near the site. The letter from the DNR is included in Appendix C.
The City of Rosemount 2020 Land Use Plan Map from the 2020 Comprehensive Plan Update has
designated the project site as Park/Open Space and Business Park. This area will need to be re- guided as
Urban Attached residential or Moderate Density Residential (R -3). The City of Rosemount's municipal
water system currently consists of two independent water systems, which operate at different elevations.
One serves the urbanized, west side of the City and the other serves the more industrial, eastern portion of
the City. The western system consists of four wells and two storage facilities. The eastern system
consists of two wells and a recently constructed water tower. To meet increases in water demand, the two
systems were connected this year in an effort to provide limited backup to the eastern system. The
western pressure zone operates at a higher elevation than the eastern pressure zone. A pressure reducing
station allows flow from the western zone to the eastern zone under certain conditions.
The Brockway Residential project site is located in the Western pressure zone. At build -out the Western
pressure zone will have an estimated maximum daily water demand of 13.5 MGD. Wells will be added to
the system as required to meet the anticipated need of 13.5 MGD. Planning for a new well is underway.
The new well is anticipated to be installed by February 2005 and will pump directly into the Western
pressure zone. It is anticipated that the new well capacity will be approximately 1200 GPM.
Additionally, a new water tower is proposed to be constructed by October 2005. Existing wells include
the following:
Well Number
Unique Well No.
Well Capacity GPM
3
211999
500
7
112212
1100
8
509060
1000
9
554248
1600
*RR 1 (10)
457167
500
*RR 2 (11)
474335
500
*Designates wells that are located in the Eastern pressure zone.
Brockway Residential Development
Rosemount, Minnesota
1/8/04
Environmental Assessment
Worksheet
Approximately 4 additional acres of on -site ponding is proposed for this project.
One known well is located in the warehouse and the approximate location of the well is illustrated on
Figure 5 in Appendix A. This well is proposed to be permanently sealed and recorded prior to
commencement of the development project.
Planning for the overall system, including source, treatment, storage, and distribution is discussed in the
Water Supply and Distribution Plan for the City of Rosemount (September 1997). Although water
treatment is not required at this time, it is anticipated that treatment may be needed or desired at a future
time. The DNR water appropriation permit number is 766069.
The project site does not fall within the FEMA 100 -year flood plain and there are no shoreland zoning
districts within the vicinity of this project. No state or federally designated wild or scenic river land use
district exists on the property according to the Minnesota DNR's Wild, Scenic, and Recreational Rivers'
map.
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Not Applicable
The Soil Survey of Dakota County, Minnesota (Index Map Sheets 21, 22) shows the area soils that have
steep slopes and/or are highly erodible as:
• Chetek Sandy Loam (155C), 8 -15 Percent Slopes
• Spencer (150B), 2 -6 Percent Slopes, Potentially Highly Erodible Land
The site is generally level to rolling with some hillier areas to the south where Chetek Sandy Loam is
mapped. These hillier areas are planned as park and main entrance areas and will be vegetated with trees,
shrubs, and grasses to prevent erosion.
During construction, silt fence, on -site ponding and Best Management Practices as outlined by MPCA will
be incorporated throughout all construction phases and until final site stabilization. Catch basin clean out
and street sweeping as needed will be used as temporary and permanent sediment control measures.
Brockway Residential Development
Rosemount, Minnesota
1/8/04
Environmental Assessment
Worksheet
The predicted future water demands for the Brockway Residential Development were based on estimating
that each residential unit will use 274 gallons /day /unit. This creates an estimated demand of 167,688
GPD for the development. The City will provide adequate water supply to meet the residential
requirements and has plans underway for a new well and water tower to be completed by 2005.
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Current runoff from the site is treated by approximately 0.94 acres of existing ponding. The City of
Rosemount's Comprehensive Stormwater Management Plan (CSMP) provides policies for water
quantity and quality once development occurs. This Plan also identifies regional storm water
basins /infiltration areas for surface water management. With an increase in existing impervious
surface onsite, approximately 4 acres of new ponding is proposed to be constructed to address the
requirements of the City's CSMP and to provide treatment for runoff from this site. The City has
plans to build a regional storm water pond west of Trunk Highway 3 that will receive runoff from
the western portion of the surrounding subwatershed area. In the fall of 2004, Keegan Lake will
outlet to a new regional pond located southeast of the site to accommodate increases to water
quantity volumes.
The site is proposed to drain in three directions; north to Keegan Lake, west across Trunk Highway
3, and southeast across Connemara Trail to an existing regional pond. All three of these areas are
designated as regional ponding areas in the City's Stormwater Management Plan. Drainage to
Keegan Lake will be required to meet Nationwide Urban Runoff Program (NURP), NPDES, and /or
requirements of the City's Wetland Management Plan for rate control and pollutant removal.
The storm water management plan for the site is required to limit the maximum peak storm water
discharge rate to 0.05 cfs /acre for a 100 -year, 24 hour storm event by using the regional ponds
and /or on -site ponding. The development will also be required to provide 1/12 of an acre -
foot/acre /day of infiltration for the entire site's acreage either on -site or in the regional system.
' The City's Comprehensive Stormwater Management Plan requires pretreatment of storm water in
accordance with NURP or NPDES guidelines prior to discharge from the site.
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The City of Rosemount's Comprehensive Stormwater Management Plan outlines storm water
discharge directions and locations. On -site ponding will be required to provide rate control. The
majority of the storm water from the southern half of the site will be directed into a regional pond
located south of the site across Connemara Trail. Drainage from the northern section of the site will
be directed to Keegan Lake after pretreatment of runoff to NURP standards using on -site ponding
(see site plan, Appendix B). Ponding and infiltration in the north will also provide the required
rate control. Drainage from the west of the site will be directed to the regional pond on the west
side of Trunk Highway 3.
The City of Rosemount anticipates directing stormwater runoff to the Mississippi River via a major
trunk system in the near future. During the short and potentially long interim to completion of this
project, the City has entered into an agreement with MCES to oversize their existing waste water
effluent outfall to the Mississippi River to accommodate increased treated stormwater flows from
the City. Construction of the oversized outfall is scheduled to begin in 2005. The City's
Comprehensive Stormwater Management Plan outlines policies to manage stormwater runoff on an
interim basis. This Plan also identifies the construction of a future storm water trunk system that
will direct treated storm water south and east to a regional pond and finally to the Mississippi
' Brockway Residential Development
Rosemount, Minnesota
1/8/04
Environmental Assessment
Worksheet
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interim basis. This Plan also identifies the construction of a future storm water trunk system that
will direct treated storm water south and east to a regional pond and finally to the Mississippi
River. The City's long -term plan is to provide this treated surface water outlet to the Mississippi
River. The incorporation of the City's policies for storm water infiltration, rate control, and
treatment will minimize the impact of storm water on the water quality of receiving waters within
' the development and downstream, both now and in the future.
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This area is in the 2010 Metropolitan Urban Service Area (MUSA) and will be served with
treatment by the MCES Rosemount Wastewater Treatment Plant. Based on information received
from MCES, it is anticipated that this facility has the capacity to accommodate the development of
this property. The sanitary sewer flow generated by the development will be accommodated by the
City of Rosemount sanitary sewer system. The Brockway Draw Trunk Sanitary Sewer Line will
provide sewer connection to this development.
Not Applicable
Brockway Residential Development Environmental Assessment
Rosemount, Minnesota 10 Worksheet
1/8/04
Normal domestic sewage will be generated by the site and treated at the Metropolitan Council
Environmental Services (MCES) Rosemount Wastewater Treatment Plant. It is estimated that this
site will generate 167,688 gallons per day (GPD). The estimate assumes that each unit in the
development will generate 274 GPD.
Wastewater will not be treated on -site.
Based on the information from the Dakota County Soil Survey, there are no known sink holes,
shallow limestone formations, or karst conditions within the site. It is believed that groundwater in
the area generally flows to the east - northeast. Information about groundwater and bedrock depths
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came from the Geological Atlas of Dakota County, MN and the Phase I Environmental Site
Assessment (ESA) Update report dated July 30, 2003.
See response to Item 9 for more information.
• Antigo Silt Loam, Ito 8 percent slopes (49B)
Undulating to rolling, well drained soil. The permeability of the soil is moderate in the
upper mantle and rapid in the underlying material and runoff is medium. This soil has a
poor filtering capacity which may result in ground water contamination. This soil map unit
is the largest unit within the property boundary.
• Kennebec Variant Silt Loam (1816)
Nearly level, moderately well drained soil. Kennebec has a moderate permeability. Runoff
is slow to ponded. This soil has a low potential for groundwater contamination.
• Chetek Sandy Loam, 8 to 15 percent slopes (155C)
Rolling and hilly, somewhat excessively drained soil. The soil permeability is moderately
rapid in the surface layer and rapid in the underlying layer and runoff is medium. This soil
has a poor filtering capacity which may result in ground water contamination.
• Kingsley Sandy Loam, 3 to 8 percent slopes (342B)
Undulating to rolling, well drained. Soil permeability in the surface layer is moderate and
moderately slow in the subsurface layer and runoff is medium. This soil has a low potential
for ground water contamination.
• Spencer Silt Loam, 2 to 6 percent slopes (150B)
Undulating and moderately well drained. Soil permeability is moderate and runoff is
medium. This soil has a low potential for ground water pollution.
• Kingsley - Mahtomedi- Spencer Complex, 3 to 8 percent slopes (895B)
Undulating to rolling, well drained, excessively drained, and moderately drained soils.
Permeability is rapid and runoff is medium. Filtering capacity is low which increases the
potential for ground water contamination in the Mahtomedi soils.
• Urban Land (1039)
Level to gently sloping with greater than 90 percent of the surface covered with buildings,
asphalt, concrete and other impervious surfaces. Runoff is high and potential for ground
water contamination is low.
Based on information from the Dakota County Geological Atlas, the sensitivity of the Prairie du
Chien -Jordan aquifer to pollution is considered high in this area. However, the proposed residential
development is not anticipated to create the potential for groundwater contamination as hazardous
waste will not be present on -site. Additionally, storm water will be pretreated prior to discharge
into the city storm sewer system. Any contaminated soils identified during the demolition and
removal of the glass factory facility and grading of areas identified as being potential sources of
pollutants will be removed or treated prior to redevelopment.
The Soil Survey of Dakota County, Minnesota (Index Map Sheets 21,22) shows the following soils
in the project area:
Brockway Residential Development Environmental Assessment
Rosemount, Minnesota 11 Worksheet
1/8/04
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Traffic Generation
Land Use "
Size
Daily Traffic
P.M. Peak Hour
Single Family
125
1,197
127
Multi-Family
487
1,795
160
Commercial/Retail
15,000 SF
665
41
Total Development
3,657
328
The estimated trip generation is based on information identified in the Sixth Edition of the Institute of
Transportation Engineers (ITE) Trip Generation Manual.
A Traffic Impact Study was prepared for the proposed Brockway Residential Development. The traffic
study document is included in Appendix D.
The primary impacted roadways adjacent to the site are Connemara Trail, County Road (CR) 38 (132
Street), and Trunk Highway (TH) 3. Primary access to the site will be provided via Connemara Trail and
CR 3 8. Both Connemara Trail and CR 3 8 are local collector roadways. TH 3 is classified as a minor
arterial
' The regional impacts to TH 3 were analyzed. The results indicated that the existing (2003) intersections
are operating at satisfactory levels of service, (i.e. LOS C or better). The 2008 conditions are anticipated
to operate at Level of Service (LOS) E at TH 3 and Connemara Trail and CR 38 intersections, assuming
' no traffic control improvements. Based on this data and analysis, the proposed site traffic combined with
future background traffic would have a small potential impact to the regional highway system in the
future. Coordination would be required between the City, Dakota County, and Mn/DOT as traffic
' Brockway Residential Development Environmental Assessment
Rosemount, Minnesota 12 Worksheet
' 1/8/04
Household municipal solid waste will be generated by this project. Municipal solid waste will be
hauled away by local garbage haulers and residents will be encouraged to recycle.
The project itself will not generate any toxic or hazardous materials. However, the demolitions of
the existing warehouse and factory as well as the presence of existing on -site contaminants have
been identified as an issue. See Item # 9 for more details.
All above ground storage tanks will be removed prior to site redevelopment.
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continues to grow on Connemara Trail and CR 38. The City has submitted a Municipal Cooperative
Agreement Application for improvements to TH 3 that would include:
1. TH 3 at Connemara Trail
• Constructing a new traffic control signal system at the intersection.
2. TH 3 at CR 38 (132 Street)
• Widen TH 3 with the additional left and right -turn lanes for northbound and southbound
approaches.
• Widen CR 38 westbound to include two lanes of approach with a left -turn and a through
right -turn lane.
3. TH 3 at CSAH 30 (125` Street)
• Widen TH 3 with the addition of a northbound left -turn lane and southbound right -turn lane.
• Widen CSAH 38 eastbound to include a two -lane approach with a left -turn lane and right-
turn lane.
• Construct a new traffic control signal system at the intersection.
4. Access Improvements
• Close the access on TH 3 to the Triangle Warehouse and Brockway Golf Course and
relocate the access to CR 38.
• Work with property owners on the west side of TH 3 to combine the two access points or
relocate both accesses to Dodd Boulevard.
If these improvements were installed, the overall intersection levels of service would improve to LOS C
or better at the intersections of Connemara Trail and TH 13, and CR 30 and TH 3.
The CR 38 intersection will need to be reviewed as development occurs to determine when or if a traffic
signal would be justified.
No stationary sources of air emissions will be constructed as part of the project.
The proposed project will include development of approximately 612 new residential units. A carbon
monoxide analysis is not required for this project. However, it is not anticipated that the state or federal
guidelines would be exceeded.
Brockway Residential Development Environmental Assessment
Rosemount, Minnesota 13 Worksheet
1/8/04
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Noise
Noise from construction activity is anticipated to temporarily increase. However, upon completion of
construction of the site, only normal noise levels associated with a residential condition are anticipated.
Dust
During construction, particulate emission will temporarily increase due to generation of fugitive dust.
The following dust control measures will be undertaken as necessary:
1. Minimize the period and extent of area being exposed or regraded at any one time.
2. Spraying construction areas and haul roads with water, especially during periods of high wind or
high levels of construction activity.
3. Minimize the use of vehicles on unpaved surfaces.
4. Covering or spraying material piles and truck loads.
Odors
a) According to the letter received from SHPO, there is a possibility that unreported archeological
properties might be present in the project area within 500 feet of Keegan Lake and recommends
completing a survey of these areas. The letter states that if the site was previously disturbed, the
need for a survey would be re- evaluated. A small portion of the northeast corner of this site is
within 500 feet of Keegan Lake south of County Road 38. It is probable that areas of this site
within 500 feet of Keegan Lake were graded in the past when the golf course was constructed.
Additionally, the SHPO letter states that an old rectory is located in the NW SW NE of Section
20. This site is located to the northwest and outside of the Brockway site and will not be
impacted by the proposed Brockway Residential Development. A copy of this letter is included
in Appendix C.
b) Based on information from the Dakota County Soil Survey the following are Prime Farmland
Soils:
• Antigo Silt Loam (4913)
Brockway Residential Development Environmental Assessment
Rosemount, Minnesota 14 Worksheet
1/8/04
The construction and/or operation of this project is not anticipated to involve any processes or materials
that would generate any odors.
This area will be converted from golf greens /open space and industrial /warehouse to residential
housing and park/open space.
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activities.
This project is subject to the following City of Rosemount plans:
' Additionally, this project is subject to review and approval by the Minnesota Pollution Control Agency
since there is a documented VIC site located within the proposed development site.
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Rosemount, Minnesota 15 Worksheet
1/8/04
Construction operations will be required to meet the City's ordinances related to duration of construction
The 1997 Water Supply and Distribution Plan for the City of Rosemount provides information on future
locations of trunk water main, treatment facilities, and storage reservoirs. The 1997 plan contains a 1.5
MG elevated reservoir near the Brockway Residential Development site. Based on the City of
• Comprehensive Stormwater Management Plan
The storm water management for the site will be required to meet the policies of the City's
Comprehensive Stormwater Management Plan. This will be addressed during the City's plan
review process.
• Comprehensive Wetland Management Plan
Development around the wetlands is required to meet the policies in the City's Wetland
Management Plan. This will be addressed during the City's plan review process.
• 2020 Comprehensive Plan and Comprehensive Plan Amendment
Re- guiding of the area is required for this proposed project to address the housing density and
change of land use within the site. This will be addressed as part of the plan review process.
'
A review of the Comprehensive Stormwater Management Plan, Comprehensive Wetland Management
Plan, and the 2020 Comprehensive Plan was completed. The Brockway Residential Development plan
will be required to meet the standards and policies in these plans. The City has concerns over whether or
not the Concept Plan offers adequate parking. This issue will be addressed during the review process and
final approval of the site plan.
' Additionally, this project is subject to review and approval by the Minnesota Pollution Control Agency
since there is a documented VIC site located within the proposed development site.
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Brockway Residential Development Environmental Assessment
Rosemount, Minnesota 15 Worksheet
1/8/04
Construction operations will be required to meet the City's ordinances related to duration of construction
The 1997 Water Supply and Distribution Plan for the City of Rosemount provides information on future
locations of trunk water main, treatment facilities, and storage reservoirs. The 1997 plan contains a 1.5
MG elevated reservoir near the Brockway Residential Development site. Based on the City of
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Rosemount's 2020 Comprehensive Plan, this 1997 water storage need has been determined to be 1.0 MG
in lieu of the 1.5 MG originally planned. Water lines will be extended from the proposed 1.0 MG water
storage facility and connected to the City's water distribution system that is currently in place. The City
has a new well and water tower planned for completion in 2005 to accommodate growth in demand for
water in this area.
The City's Comprehensive Stormwater Management Plan includes regional ponding to accommodate and
treat increased runoff from development in the general vicinity of this project. The Plan identifies the
construction of a future storm water trunk system that will direct treated storm water south and east to a
regional pond and finally to the Mississippi River. Interim use of the oversized MCES outfall proposed
to begin construction in 2005 will accommodate treated runoff from the City. The City's long -term plan is
to provide this surface water outlet to the Mississippi River. The incorporation of the City's policies for
stormwater infiltration, rate control, and treatment will minimize the impact of storm water on the water
quality of receiving waters within the development and downstream, both now and in the future. Onsite
ponding for treatment is proposed as part of the project plan and will be required to meet City standards.
The Brockway trunk sanitary sewer line will service the Brockway Development. Sewage will be treated
by the existing MCES Rosemount Wastewater Treatment Plant.
Traffic volume on TH 3, Connemara Trail and CR 38 will increase. The development of the proposed
project, together with adjacent development and future background traffic, will require improvements to
the roadway system. These improvements include:
' 1. Work with Mn/DOT and the City on geometric improvements as outlined below:
• TH 3 at Connemara Trail — Construct a potential new traffic control signal system at the
intersection.
• TH 3 at CR 38 (132 Street) — Widen TH 3 with the addition of left- and right -turn lanes for
northbound and southbound approaches. Widen CR 3 8 westbound to include two lanes of
approach with a left -turn lane and through right -turn lane.
• Access Improvements — Close the access on TH 3 to the Triangle Warehouse and Brockway
' site and relocate the access to CR 38. Work with the property owners on the west side of
TH 3 to combine the two access points or relocate both accesses to Dodd Boulevard.
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2. Monitor the traffic conditions at TH 3 at CR 38 to determine when a traffic signal system would be
warranted and justified. Work with Mn/DOT and Dakota County on funding when this occurs.
Money should be escrowed from the developer for the City's portion of the signal cost.
3. Improve CR 38 from the site access to TH 3 to a 44 -foot wide three -lane roadway providing left -turn
lanes at the site access and TH 3.
4. Construct the site accesses to three -lane cross sections with one entry lane and two exiting lanes.
The regional land use conversion from open space /park and industrial/warehouse to developed residential
space is anticipated to have a cumulative impact on the area. Attempts to mitigate for this impact will
Brockway Residential Development Environmental Assessment
Rosemount, Minnesota 16 Worksheet
1/8/04
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include providing 25 acres of open space in the development which includes a 15 acre dedicated park,
providing adequate storm water management facilities, and addressing traffic impacts. The land
surrounding the site is zoned as RI, R2, and R3. The City's current ordinances, standards, and policies
are anticipated to be adequate to address these issues.
The recognized environmental impacts associated with the Brockway Residential Development project
are as follows:
The land use will be converted from industrial, open space and park to residential: The
development plans include a 15 acre public park and ball field and 10 acres of private open space
area to mitigate this impact. The development also provides the opportunity to create a trail system
and cleanup any existing or potential environmental conditions under the direction of Dakota
County and MPCA, as recommended by the Phase I ESA Update report and by the participants in
the January 14, 2004 meeting.
2. Sanitary sewer flows and water consumption will increase: The MCES Rosemount Wastewater
Treatment Facility has adequate capacity to handle the sewage volumes from this site. The increase
in water demand will be mitigated by the expansion of the City's water supply through the
installation of a new well and water tower, storage, and distribution systems that are planned for
completion in 2005.
3. Stormwater runoff volume will increase and runoff pollutant loads will increase: Within the
development site approximately 0.94 acres of ponding/infiltration basins exist and 4 acres will be
created to accommodate the increased stormwater runoff volume. The impacts related to storm
water quality and quantity will be mitigated by the use of the on -site storm water treatment ponds
and infiltration areas to reduce pollutant loads and provide rate control.
4. Traffic on the impacted roadways (TH 3, Connemara Trail and CR 38) will continue to increase
with this proposed development, adjacent development, and general background traffic growth. As
a result, several improvements will be necessary to improve the safety and operation of traffic on
these roadways. These improvements are outlined in Section 28 (Impact on Infrastructure and
Public Services).
5. Information from Dakota County, MPCA, and the July 2003 Phase I ESA Update report identifies
potential and/or existing pollutants within the site. A Construction Contingency Plan and/or a
Response Action Plan will be developed by CPDC. It is also anticipated that the site will be
enrolled in the VIC and VPIC programs to address the existing and potential contaminants on the
site.
Brockway Residential Development
Rosemount, Minnesota 17
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Environmental Assessment
Worksheet
No other adverse environmental impacts are anticipated to result from this project.
RGU CERTIFICATION.
I hereby certify that:
• The information contained in this document is accurate and complete to the best of my knowledge.
• The EAW describes the complete project; there are no other projects, stages or components other than those
described in this document, which are related to the project as connected actions or phased actions, as
defined at Minn. R. 4410.0200, subps. 9b and 60, respectively.
• Copies of this EAW are being sent to the entire EQB distribution list.
Name and Title of Signer:
Date:
The format of the Environmental Assessment Worksheet was prepared by the staff of the Environmental
Quality Board at Minnesota Planning. For additional information, worksheets or for EAW Guidelines, contact:
Environmental Quality Board, 658 Cedar St., St. Paul, MN 55155, 651- 296 -8253, or at their Web site
http://www.mnplan.state.mn.us
Brockway Residential Development
Rosemount, Minnesota 18
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Environmental Assessment
Worksheet
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APPENDIX A
General Location Map, U.S.G.S. Quad Map, Aerial Photo, Known and Potential
Pollutant Location Map, Existing Well Location Map
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Figure 1
General Location Map
Brockway Development Site
' Rosemount, MN
-
4150 Olson Memorial Highway
Suite 300
WVB
Minneapolis, MN 55422
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&.associates, Im.
FAX 763- 541 -1700
WSB Project No. 1556-03
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USGS LOCATION MAP
ROSEMOUNT, MN
WSB PROJECT NO. 1556-03
FIGURE 2
LEGEND
Feet
0 1,000 2,000 4,000
FIGURE 3
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AERIAL PHOTO
ROSEMOUNT, MN
WSB PROJECT NO. 1556-03
PROJECT LOCATION
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BROCKWAY DEVELOPMENT SITE
LOCATION OF POTENTIAL AND KNOWN SOURCES
OF SOIL AND GROUNDWATER POLLUTANT SITES
ROSEMOUNT, MN
WSB PROJECT NO. 1556 -03
LEGEND
�.� POTENTIAL POLLUTANTS UNDERNEATH BUILDING
VOLUNTARY INVESTIGATION & CLEANUP
■ DROs
® FORMER LUST SITE
Site information based on data from MPCA, the Phase I ESA update,
and Dakota County
_ P
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BROCKWAY DEVELOPMENT SITE
LOCATION OF POTENTIAL AND KNOWN SOURCES
OF SOIL AND GROUNDWATER POLLUTANT SITES
ROSEMOUNT, MN
WSB PROJECT NO. 1556 -03
LEGEND
�.� POTENTIAL POLLUTANTS UNDERNEATH BUILDING
VOLUNTARY INVESTIGATION & CLEANUP
■ DROs
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Site information based on data from MPCA, the Phase I ESA update,
and Dakota County
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APPENDIX C
Department of Natural Resources Letter,
State Historical Preservation Office Letter,
MPCA LUST Incident Letter of Closure
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December 10, 2003
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Anna Brenes
. C- L ' t
WSB & Associates Inc. DEC 1 6 2003
4150 Olson Memorial Highway, Suite 300
Minneapolis, MN 55422 WSB & ASSOCIATES
Re: Request for Natural Heritage information for vicinity of proposed Brockway Residential
Development
T115N R 1 9W Section 20 & 21, Dakota County
NHNRP Contact #: ERDB 20040372
Dear Ms. Brenes,
The Minnesota Natural Heritage database has been reviewed to determine if any rare plant or
animal species or other significant natural features are known to occur within an approximate one -mile
radius of the area indicated on the map enclosed with your information request. Based on this review,
there are no known occurrences of rare species or natural communities in the area searched.
The Natural Heritage database is maintained by the Natural Heritage and Nongame Research
Program, a unit within the Division of Ecological Services, Department of Natural Resources. It is
continually updated as new information becomes available, and is the most complete source of data on
Minnesota's rare or otherwise significant species, natural communities, and other natural features. Its
purpose is to foster better understanding and protection of these features.
Because our information is not based on a comprehensive inventory, there may be rare or
otherwise significant natural features in the state that are not represented in the database. A county -by-
county survey of rare natural features is now underway, and has been completed for Dakota County. Our
information about natural communities is, therefore, quite thorough for that county. However, because
survey work for rare plants and animals is less exhaustive, and because there has not been an on -site
survey of all areas of the county, ecologically significant features for which we have no records may exist
on the project area.
Please be aware that review by the Natural Heritage and Nongame Research Program focuses
only on rare natural features. It does not constitute review or approval by the Department of Natural
Resources as a whole. If you require further information on the environmental review process for other
wildlife- related issues, you may contact your Regional Environmental Assessment Ecologist, Wayne
Barstad, at (651) 772 -7940.
An invoice for the work completed is enclosed. You are being billed for map and database search
and staff scientist review. Please forward this invoice to your Accounts Payable Department. Thank you
for consulting us on this matter, and for your interest in preserving Minnesota's rare natural resources.
encl: Invoice
Sincerely
Sarah D. Hoffmann
Endangered Species Environmental Review Coordinator
DNR Information: 651 -296 -6157 • 1- 888 - 646 -6367 • TTY: 651- 296 -5484 • 1 -800- 657 -3929
Minnesota Department of Natural Resources
Natural Heritage and Nongame Research Program, Box 25
500 Lafayette Road
St. Paul, NRinnesola 55155 -40
Phone: (651) 296 -7863 Fax: (651) 296 -1811 E -mail: sarah.hoffmann @dnr.state.mn.us
An Equal Opportunity Employer ®f Printed on Recycled Paper Containing a
Who Values Diversity W Minimum of 10% Post - Consumer Waste
JAN -06 -2004 09:16 WSB & ASSOCIATES 7635411700 P.03iO4
01/06/2004 09:09 AM City of Rosemount Engineer! Dept. 651 322 2694 3/4
JAN--05 -2004 16:52 WSB & ASSOCIATES 7635411700 P.04
January 2.2004
0
MINNESOTA HISTORICAL SOCIETY
STATE HisToRlc PRESEWATION OFFICE
Ms. Anna Brsnes
WS9 & AssoclWas
4150 Olson Memorial Highway, Suite 300
Minneapolis, MN 56422
' RE: Brockway Residential Development
Project No. 1556-03
T115 Rig S20 & S21, Rosemount, Dakota County
SHOD Number: 2004-0652
Dear Ms. Brenes:
ThanK you for Consulting with our office regarding the above referenced project proposal. We have the following
comments:
1. We believe that there is a good probability that unreported archaeological properties might be present In the
project area. Therefore, we recommend that a survey of the project areas within 500 feet of the lake be completed.
' The survey must meet the requirements of the Secretary of the Interior's Standards for identification and Evaluation,
and should include an evaluation of National Register efigbility for any properties that are identified. For your
information, we have enclosed a list of consultants who have expressed an interest in undertaking such surveys.
' if the project area can be documented as previously disturbed or previously surveyed, we will re- evaluate the need
for survey. Previously disturbed areas are those where the naturally occurring post - glacial soils and sediments have
been ram* removed. Any previous survey work must meet contemporary standards.
' 2. Our yniventory includes a budding located in the NW SW NE of Section 20, which as been known as the old
rectory. The current status of this property is unknown, and it has not been evaluated. If you would provide updated
information on this property, we will be able to comment further.
Pime riots that this Comment letter does not address the requirements of Section 106 of the National Historic
Preservation Act of 1966 and 36CFR800, procedures of the Advisory Council on Historic Preservation for the protection
of historic properties. if this project Is consldered for federal assis%ppe, or requires a federal license or permit, it should
be submitted to our office with reference to the appropriate federal agency.
If you have any questions on our review of this project, please contact me at (651) 296 -5462. Please refer to the SHPO
' Number above In any correspondence.
Sincerely,
' Dennis A. Gi nmestad
Government Programs and Compliance Officer
Enclosure List of Consultants
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APPENDIX D
Traffic Analysis
TRAFFIC IMPACT STUDY
BROCKWAY DEVELOPMENT
CONTRACTOR PROPERTY DEVELOPERS COMPANY
FOR:
CITY OF ROSEMOUNT
2875 145 STREET WEST
ROSEMOUNT, MN 55068
November 12, 2003
Prepared by:
WSB & Associates, Inc.
4150 Olson Memorial Highway, Suite 300
Minneapolis, MN 55422
TRAFFIC IMPACT STUDY
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CERTIFICATION
I hereby certify that this plan, specification or report was prepared by me or under my direct
supervision and that I am a duly licensed professional engineer under the laws of the State of
Minnesota.
Charles T. Rickart, P.E., P.T.O.E.
Date: November 12, 2003
TRAFFIC IMPACT STUDY
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ROSEMOUNT,MN
WSB PROJECT NO. 1565 -00
Lic. No. 26082
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TABLE OF CONTENTS
I . INTRODUCTION ................................................................................ ..............................1
II. EXISTING TRAFFIC CONDITIONS .............................................. ..............................3
I1I. SITE TRAFFIC CHARACTERISTICS ............................................ ..............................4
IV. PROPOSED ROADWAY IMPROVEMENTS ................................. ..............................6
V. TRAFFIC IMPACT ANALYSIS ....................................................... ..............................8
VI. SITE ACCESS ..................................................................................... .............................12
VII. CONCLUSIONS /RECOMMENDATIONS ..................................... .............................13
APPENDICES
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I. INTRODUCTION
Contractor Property Developers Company plans to construct a residential development in
the City of Rosemount, MN. The site of the proposed development is bounded by Trunk
Highway (TH) 3 on the west, County Road (CR) 38 on the north, Connemara Trail on the
south and the Chicago, Milwaukee, St. Paul, and Pacific Railroad on the east. Access to
this site will be provided via one full access driveway to CR 38 and one full access
driveway to Connemara Trail, with a site circulation roadway within the site. Figure 1 in
the Appendix shows the proposed site plan.
The City of Rosemount requested that a Traffic Impact Study be prepared to determine
what impact the proposed development might have on traffic operations and what site
access improvements may be necessary to safely and efficiently accommodate both site
and non -site traffic.
In order to thoroughly evaluate this impact, the following tasks were undertaken:
Meet with the City of Rosemount and the developer to discuss the perimeters of
the development.
2. Where traffic data was lacking or out of date, conduct traffic counts at key
intersections.
3. Using existing traffic volume data and appropriate factors, future background
(non -site) traffic volumes were projected for the Design Year 2008 (estimated
year of full development) for the A.M. peak hour (7:00 to 8:00 a.m.) and P.M.
peak hour (5:00 to 6:00 p.m.).
4. Estimate site generated traffic volumes. This estimate will be based on published
rates in the Institute of Transportation Engineer's Traffic Generation Manual.
5. Based on current traffic patterns, develop a directional distribution for site
generated traffic.
6. Based on the derived directional distribution, assign traffic volumes to the area
roadway system.
7. Combine site generated traffic volumes as assigned to the roadway system with
Design Year background traffic volumes.
Perform a Capacity Analysis on traffic volumes derived in Item 7 for key
intersections within the site area. Based on these analyses, define site access
requirements and recommend any necessary improvements.
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9. Review of site circulation and access plan.
1 The results of these analyses is a roadway and site access system capable of
accommodating expected future traffic volumes. The key findings of these analyses are
given in the following sections of this report.
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' II. EXISTING TRAFFIC CONDITIONS
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As stated previously, the site is located east of Trunk Highway (TH) 3 between CR 38
and Connemara Trail. The site location is illustrated in Figure 2 found in the Appendix.
The primary roadways expected to be served by the site are discussed below.
'
Trunk Highway (TH) 3 is a north/south B minor arterial roadway which extends from
St. Paul southerly through Rosemount into Southern Minnesota. In the vicinity of the
site, TH 3 provides a two -lane cross section with one lane in each direction. At the
'
intersection of CR 38, a northbound and southbound right -turn lane is provided. At the
intersection of Connemara Trail, a left- and right -turn lane is provided both northbound
'
and southbound. The posted speed limit on TH 3 transitions from 45 MPH to 55 MPH
between Connemara Trail and CR 38. The existing average daily traffic on TH 3 in this
area is approximately 12,000 vehicles per day.
'
County Road (CR) 38 is an east/west roadway which runs from Blaine Avenue (CSAH
71) on the east to TH 3 where it jogs northerly before proceeding to the west as CSAH
'
38. In the vicinity of the site, CR 38 is a two -lane rural cross section with one lane in
each direction. Approaching the intersection of TH 3 is a single -lane with no turn lanes.
A 45 MPH speed limit is posted on this roadway. The existing average daily traffic on
CR 38 is approximately 360 vehicles per day.
Connemara Trail is an east/west arterial City street which extends from the Apple
Valley border on the west and currently ends at Biscayne Avenue. Connemara Trail is
'
currently under construction to cross the existing railroad tracks and ultimately connect to
Blaine Avenue (CSAH 71) on the east. Currently, Connemara Trail is striped to
accommodate a two -lane cross section west of TH 3 to match the two -lane cross section
east of TH 3. However, the width of Connemara Trail has been constructed to
accommodate a four -lane section. Ultimately, Connemara Trail will be a four -lane
facility with right- and left -turn lanes at major intersections. Currently, at the intersection
of TH 3, a left- and right -turn lane are provided for both eastbound and westbound. A 35
MPH speed limit is posted on Connemara Trail in the vicinity of the site. The current
average daily traffic on Connemara Trail is approximately 520 vehicles per day.
Existing Traffic Volumes
Peak hour turning movement counts were previously conducted by WSB & Associates,
Inc. on June 9 and 10, 2003. These counts were conducted from 6:00 a.m. to 9:00 a.m.
and 3:00 p.m. to 6:00 p.m. Twenty -four hour directional counts were also conducted on
June 9 and 10 on CR 38 and Connemara Trail. The existing A.M. peak hour and P.M.
peak hour turning movement counts (Figure 3) and the average daily traffic counts
(Figure 4) are included in the Appendix.
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III. SITE TRAFFIC CHARACTERISTICS
Site Generated Traffic Volumes
The proposed Brockway Site Development that will generate additional traffic consists of
91 single - family residences, 362 town homes, 60 senior condominiums, and 120
apartment units. The Institute of Transportation Engineers (ITE) Trip Generation Manual
'
was used to calculate the A.M. and P.M. peak hour entry /exit volumes and the average
daily traffic volume for the proposed development.
In addition to the proposed site, additional adjacent development was assumed in the
analysis. This additional development included the development of the Minea Site,
Biscayne Point, and St. Joseph's Church and School.
The anticipated A.M., P.M., and average daily traffic trip generation is shown in Table 1
on the following page.
Site Traffic Distribution
'
Site traffic distribution was assumed to be consistent with the existing traffic patterns.
The existing A.M., P.M., and average daily traffic counts were used to determine this
distribution. Figure 5 in the Appendix illustrates the overall traffic distribution for the
proposed Brockway site.
'
Projected Traffic
The estimated first year of full development for the proposed site is 2008; therefore, the
Traffic Impacts Analysis was conducted for that future year. The 2008 background street
traffic volumes were estimate by increasing the existing peak -hour counts and average
daily traffic volume by a growth factor of 2.7% per year on TH 3 and 6.5% per year on
CR 38 and Connemara Trail. The higher growth rate is the result of anticipated diverted
'
traffic from 145 Street and other adjacent developments (Bloomfield) not directly
included in the traffic generation. The 2008 total traffic volume was then developed by
adding the proposed site traffic together with the adjacent development traffic to the
background traffic. The Existing and Projected Average Daily Traffic (Figure 4) and
projected 2008 A.M. and P.M. peak hour traffic volumes for background (Figure 6) and
'
volume total with site traffic (Figure 7) is included in the Appendix.
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Table 1
Traffic Generation
Brockway Site
City of Rosemount
Land Use
Size Unit
Average Daily Traffic
Rate I Trips
AM Peak Hour
Rate Total Trips In Out
PM Peak Hour
Rate Total Trips In Out
B Site
Singl Fa
91
_Uni
9.57
871
0.75
68
17
51
1.01
9 2
5 9
3 3
Townhome
3 62
60
Unit
5.8
2,121
0.44
159
27
132
0 .54
195
131
65
Sen Con donimuns
Unit
3 .48
209
0.07
4
3
2
0.10
6
42
A partm ent s
12 0
Unit
6.63
79
0.51
61
10
5
0.62
7
50
2 5
Total Brockway Trips
2,992
228
44
183
287
190
98
A djacent Develop
- - -- — —
--
Minea Site - Single Fam
160
_ Un
_it
9.57
1,531
0 .75
12
30
90
1.01
162
1 03
5 8
Min Site - Tow nhomes
232
5.
1,36
0.4
10 _2
17
85
0.5
1 25
8
4 1
Biscayne Point - Sin Famil
1 04
_Unit_
9.5
995
0.75
7 8
20
5 9
1.01
105
67
38
St. Jo Ch
19
_100 SF
9. 11
17
0.72
1
7
6
0.66
13
7
6
St. Joe S chool
230
Students
1.02
2 35
0.29
67
3 9
27
0.26
60
2 8
32
Total Ad Trips
4,294
38 0
114
267
3.48
464
289
175
Total Study Area Trips
7,286
608
158
450
752
479
273
' IV. PROPOSED ROADWAY IMPROVEMENTS
The City of Rosemount has submitted an application for Fiscal Year (F.Y.) 2005
' Municipal Cooperative Agreement Funding for proposed improvements on TH 3 between
Connemara Trail and CSAH 38 (125 Street). Figure 8 in the Appendix illustrates the
proposed funding request. The proposed TH 3 improvements would include:
1. TH 3 at Connemara Trail
' ■ Construct a potential new traffic control signal system at the intersection.
2. TH 3 at CR 38 (132 Street)
■ Widen TH 3 with the addition of left -turn and right -turn lanes for
northbound and southbound approaches.
■ Widening CR 38 westbound to include two lanes of approach with a
through left -turn lane to include a two -lane approach with a left -turn lane
and a through right -turn lane.
' ■ Construct a new access on CR 38 for the Triangle Warehouse/Brockway
Golf course property on the east side of TH 3.
3. TH 3 at CSAH 38 (125 Street)
■ Widen TH 3 with the addition of a northbound left-turn lane and
' southbound right -turn lane.
■ Widen CSAH 38 eastbound to include a two -lane approach with a left -turn
lane and right -turn lane.
■ Construct a potential new traffic control signal system at the intersection.
4. Access Improvements
• Close the access on TH 3 to the Triangle Warehouse and Brockway Golf
' Course and relocate the access to CR 38.
• Work with property owners on the west side of TH 3 to combine the two
' access points or relocate both accesses to Dodd Boulevard.
The proposed project will benefit the Trunk Highway System by eliminating and/or
combining access to the corridor and providing left- and right -turn lane channelization
and delineation for TH 3 traffic, thereby improving traffic safety.
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' For the purposes of this traffic study, future roadway improvements should include, at a
minimum, the proposed improvements as outlined in the Municipal Cooperative
Agreement Application. Should Mn/DOT not participate in funding these improvements,
the developer, City, and County would need to work together to determine a cost sharing
alternative for funding the improvements.
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V. TRAFFIC IMPACT ANALYSIS
Using the traffic volume derived in previous sections, capacity analyses were formed for
key intersections within the study area. The analyses of signalized and unsignalized
' intersections were performed using the Synchro Computer Model which simulates
capacity analysis techniques as described in the Transportation Research Board (TRB)
' Highway Capacity Manual.
The ability of a highway system to accommodate expected traffic volumes is expressed in
terms of Level of Service (LOS). The LOS of an intersection is based on approach delay
and the amount of time the driver must wait at an intersection before proceeding. The
intersections are graded A through F with A representing the least delay and F
representing the greatest delay. In urbanized areas such as Rosemount, an LOS D is
typically acceptable during the P.M. peak hour, although LOS C is desirable. A brief
description of LOS is provided in Table 2. The LOS measures are standards set forth by
the Transportation Research Board (TRB) in the Highway Capacity Manual.
The results of the Capacity Analysis are shown in Table 3. The following is a brief
' discussion of the analysis results for each analysis year.
Existing 2003 Analysis
The existing capacity and LOS Analysis indicates that all intersections are currently
operating at satisfactory levels of service with the current lane configurations. All
' movements can be accommodated with the existing geometrics and traffic controls.
Year 2008 Analysis
' 1. Without Brockway Development/Existing Geometrics — The year 2008 Capacity
and Level of Service Analysis indicates that with no roadway improvements
' (existing geometrics) and the projected 2008 traffic volumes including the
adjacent development traffic (see Table 1), the intersection of TH 3 at CR 38
would operate at LOS E during both the A.M. and P.M. peak hour. The
' intersection of TH 3 at Connemara Trail would be operating at LOS D in the
A.M. and LOS E in the P.M. peak hour.
' 2. Without Brockway Development Traffic /Proposed Geometrics — The year 2008
Capacity Level of Service Analysis indicates that with the proposed geometrics as
part of the Municipal Cooperative Agreement funding project previously
' mentioned, the intersection of TH 3 at CR 38 would improve to an LOS B in the
A.M. and LOS C in the P.M. peak hours as an unsignalized intersection. The
intersection of TH 3 at Connemara Trail, assuming no geometric changes but
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'
improved with a traffic signal system, would improve to an LOS B in the A.M.
and an LOS C in the P.M. peak hour.
3. With Brockway Site Development — Assuming the addition of the Brockway
Development to the other development in the study area, and assuming the
improvements outlined in the Municipal Cooperative Agreement Application, the
intersection of TH 3 at CR 38 would be at an LOS D in the A.M. and LOS E in
the P.M. peak hour as an unsignalized intersection. However, if this intersection
would be signalized assuming the same lane geometrics, the level of service
would improve to an LOS B in the A.M. peak hour and P.M. peak hour. The
intersection of TH 3 at Connemara Trail would continue to operate at LOS C in
the A.M. and P.M. peak hour as a signalized intersection as proposed in the
Municipal Cooperative Agreement Application. The intersections of Connemara
Trail at the site access and CR 38 at the site access would both be operating at
LOS A intersection the traffic the
as an unsignalized stopping exiting site.
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Table 2
Level of Service Descriptions
Brockway Site
1 City of Rosemount
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LEVEL OF SERVICE
DESCRIPTION
A
FREE FLOW: speed controlled by driver's desires, speed limits,
or physical roadway conditions.
B
STABLE FLOW: operating speeds beginning to be restricted,
little or no restriction on maneuverability
from other vehicles.
C
STABLE FLOW: speeds and maneuverability more restricted.
D
APPROACHING UNSTABLE FLOW: tolerable speeds can be
maintained but temporary restrictions to flow cause
substantial drops in speed, little freedom to maneuver,
comfort and convenience are low.
E
UNSTABLE FLOW: volumes near capacity, speed typically in
neighborhood of 30 MPH, stoppages of momentary
duration, ability to maneuver severely limited.
F
FORCED FLOW: low- operating speeds, volume below capacity,
queues formed.
I� Ilr M m
Table 3
Traffic Analysis
Brockway Site
City of Rosemount
Intersection
Existing 2003
2008 without
Site
2008 with Site
Existing Geometrics
Proposed Geometrics
AM
PM
AM
PM
AM
PM
AM
PM
TH3atCR38
Unsignalized
Signalized
A
A
E
E
B
C
D
E
B
B
TH 3 at Connemara Tr
Unsignalized
Signalized
A
B
D
E
B
C
C
C
Connemara Tr at Site Access
Unsignalized
NA
NA
NA
NA
NA
r NA
A
A
CR 38 at Site Access
Unsignalized
NA
NA
NA
NA
NA
I NA
A
A
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' VI. SITE ACCESS
' The Brockway development site access is proposed to be from two full movement
accesses. One access from CR 38 and one access from Connemara Trail. Both access
locations will be two -way stop sign controlled stopping the exiting movement from the
' proposed Brockway site.
The access on CR 38 is located approximately 700 feet east of TH 3. This access point is
located at a location more than an 1/8 mile east of TH 3 which provides sufficient
stacking for traffic approaching TH 3 or traffic that may be turning left to go north at
intersections on CR 38 across from the proposed Brockway site access. The access
' should be constructed to a three -lane cross section with one entering lane and two exiting
lanes.
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The access on Connemara Trail is located approximately 1,500 feet east of TH 3. This
location is more than adequate for vehicle stacking to TH 3. However, some
consideration should be given to lining up the driveway with the access to the mobile
home park on the south side of Connemara Trail. This access is located approximately
500 feet west of the existing railroad crossing. Although this railroad crossing is not an
extremely active crossing, it should be noted that if excess delays are encountered by
'
vehicles waiting for a train, potential backup of traffic may occur through the site access.
The access should be constructed to a three -lane cross section with one entering lane and
two exiting lanes.
'
The internal site circulation is laid out well to collect and distribute traffic through the
site. The proposed traffic circle in the center of the site will need to have adequate
'
signing to familiarize drivers with its operation.
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VII. CONCLUSIONS /RECOMMENDATIONS
Based on the results of the traffic analysis, the following conclusions can be made:
Intersection of TH 3 at CR 38 and TH 3 at Connemara Trail are currently
' Y
operating at satisfactory levels of service (LOS C or better).
anticipated ated to generate 3 000 trips . The P.M. s er da
■ The proposed site is p g p p y
peak hour and A.M. peak hour trips are anticipated to be 287 and 228,
respectively.
■ With the addition of the improved geometries as outlined in the Municipal
Cooperative Agreement Application including left - and right -turn lanes on
TH 3 at CR 38 and a signalized intersection at TH 3 and Connemara Trail,
I the overall LOS of both intersections would be at satisfactory levels (LOS
C or better) without the proposed Brockway Development traffic.
■ In 2008 with the proposed Brockway Development traffic, assuming the
improvements as outlined in the Municipal Cooperative Agreement
Application are made, the intersection of TH 3 at CR 38 would be
operating at LOS E during the P.M. peak hour as an unsignalized
intersection. With the installation of a traffic signal at that intersection,
the overall LOS would improve to LOS B. All other intersections
including the site access, intersection would be operating at LOS C or
better.
I
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7
The location of the site accesses to CR 38 and Connemara Trail are
adequate for the proposed development.
The improvements, as outlined in the Municipal Cooperative Agreement
Application, will be required by 2008 to accommodate the proposed site
and adjacent development traffic. Even if state funding is not available,
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The adjacent development is anticipated to generate approximately 4,300
'
new trips per day with 380 A.M. peak hour trips and 464 P.M. peak hour
trips.
■ By 2008, without any geometric improvements, the intersection of TH 3 at
CR 38 would be operating at LOS E during the A.M. and P.M. peak hours
and the intersection of TH 3 at Connemara Trail would be operating at
LOS E during the P.M. peak hour period.
■ With the addition of the improved geometries as outlined in the Municipal
Cooperative Agreement Application including left - and right -turn lanes on
TH 3 at CR 38 and a signalized intersection at TH 3 and Connemara Trail,
I the overall LOS of both intersections would be at satisfactory levels (LOS
C or better) without the proposed Brockway Development traffic.
■ In 2008 with the proposed Brockway Development traffic, assuming the
improvements as outlined in the Municipal Cooperative Agreement
Application are made, the intersection of TH 3 at CR 38 would be
operating at LOS E during the P.M. peak hour as an unsignalized
intersection. With the installation of a traffic signal at that intersection,
the overall LOS would improve to LOS B. All other intersections
including the site access, intersection would be operating at LOS C or
better.
I
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The location of the site accesses to CR 38 and Connemara Trail are
adequate for the proposed development.
The improvements, as outlined in the Municipal Cooperative Agreement
Application, will be required by 2008 to accommodate the proposed site
and adjacent development traffic. Even if state funding is not available,
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C�
L�
L
1
I
the improvements will still be needed to accommodate the Brockway
Development.
Based on the analysis found in the study and the conclusions discussions above, the
following recommendations are made:
1. Work with Mn/DOT on securing Municipal Cooperative Agreement funding for
geometric improvements on TH 3 including addition of turn lanes on TH 3 at CR
38 and the signalized intersection at Connemara Trail. Should state funding not
be available, the City, County, and developer will need to work together on a
cost -share agreement.
2. Monitor the traffic conditions on TH 3 at CR 38 to determine when a traffic signal
system would be warranted and justified. Work with Mn/DOT and the County on
funding when this occurs. Escrow money from the developer for the City's
portion (25 %) of the signal costs.
3. Improve CR 38 from the site access to TH 3 to a 44 -foot three -lane roadway
providing left-turn lanes at the site access and TH 3.
4. Construct the site accesses to three -lane cross sections with one entering lane and
two exiting lanes.
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