HomeMy WebLinkAbout6.c. Stonex Environmental Assessment WorksheetCITY OF ROSEMOUNT
EXECUTIVE SUMMARY FOR ACTION
CITY COUNCIL MEETING DATE: July 20, 2004
AGENDA ITEM: Stoner EAW
AGENDA SECTION:
Consent
PREPARED BY: Andrew J. Brotzler, P.E., City Engineer
T own.. C
ATTACHMENTS: Memorandum from WSB, EAW
APPROVED BY•
RECOMMENDED ACTION: MOTION TO AUTHORIZE PUBLIC DISTRIBUTION OF TH
ENVIRONMENTAL ASSESSMENT WORKSHEET AS REQUIRED BY MINNESOTA
RULES 4410 FOR A 30 -DAY PUBLIC COMMENT PERIOD.
ACTION:
BACKGROUND:
Stonex, LLC Sand and Gravel, Mine is proposing to conduct mining operations on an 80-
acre parcel of land located 0.25 miles south of County Road 38 and 0.25 miles west of
CSAH 71. The proposed site is adjacent to the existing Vesterra gravel mine operation.
The proposed site is located within a sub -area of the City's agricultural district that allows
mining operations. Due to the size of the proposed mining operation, a mandatory EAW
is required to be completed prior to the City considering an application for mining. As
such, attached for your review and consideration is a draft EAW. At this time, Staff is
requesting Council to authorize pubic distribution of the EAW for a 30 -day comment
period.
Memorandum
To: Honorable Mayor and City Council, City of Rosemount
From: Andi Moffatt, WSB & Associates, Ina
Date: July 9, 2004
Re: Stonex Gravel Mine EAW
Environmental Assessment Worksheet
WSB Project No. 1191-24
Attached, please find a draft copy of the Environmental Assessment Worksheet (EAW) for
the Stonex Gravel Mine for your consideration at the July 20, 2004 City Council meeting.
Based on Minnesota Rules 4410.4300, the EAW for this project is mandatory due to the size
of the proposed gravel mining operation. The EAW process is required to be completed
prior to the City issuing any approvals for this project.
If the Council authorizes distribution of the EAW at the July 20, 2004 meeting, the schedule
for the EAW process will be as follows:
July 26, 2004: WSB submits EAW to EQB Monitor and distributes EAW to review
agencies
August 2 — September 1, 2004: EAW Comment Period
September 21, 2004: City Council determines the need for an Environmental Impact
Statement (EIS) for the 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. John Chadwick
F. I i -f P1T7A'.1191- ?Si0i0907- h,ncc.doc
Minneapolis • St. Cloud - Equal Opportunity Employer
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Stonex, LLC
Sand, and Gravel Mine
RGU:
EQB Monitor Publication Date: August 2, 2004
Comment Deadline: September, 1, 2004
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City of Rosemount
2875 145th St. W
Rosemount, MN 55068
WSB
& Associates, Inc.
WSB Project No. 1191 -24
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.
1. Project title,
Stonex, LLC Sand and Gravel Mine
2.Proposer 3.RGU City of Rosemount
Contact person Jonathan J. Wilmshurst Contact person Rick Pearson
Title Vice President Title City Planner
Address 12741 Shannon Parkway Address City Hall, 2875 145` St W
City, state, ZIP Rosemount, MN 55068 City Rosemount, MN 55068 -4997
Phone 651485 -7515 Phone 6514234411
Fax 651 -322 -2603 Fax 651423 -5203
E -mail jonathanwilmsQaol.com E -mail rick.pearson ,ci.rosemount.mn.us
4. Reason for EAW preparation (check one)
EIS scopin Mandatory EAW x Citizen petition RGU discretion
Proposer volunteered
If EAW or EIS is mandatory give EQB rule category subpart number 4410.4300 Subpart 12
Non- metallic mineral mining of more than 40 acres but less than 160 acres to a depth of 10 feet or
greater.
5. Project location County - Dakota City/Township - Rosemount
SE' /4 of SW' /4 and SW' /4 of SE 1 /4, Section 23,
Township 115 N Range 19,W
Attach each of the following to the EAW:
• County map showing the general location of the project;
• U.S. Geological Survey 7.5 minute, 1:24,000 scale map indicating project boundaries
(photocopy acceptable);
• Site plan showing all significant project and natural features.
These items are attached as Appendix A.
Page 1 of 15
July 9, 2004
6 Description
a. Provide a project summary of 50 words or less to be published in the EQB Monitor.
Stonex LLC intends to operate a sand and gravel mine with a crushing, washing and screening
plant to provide construction aggregates for the Twin Cities metropolitan area. The facility will be
located in an agricultural area immediately south and west of the Flint Hills refinery in Rosemount.
b. Give a complete description of the proposed project and related new construction. Attach
additional sheets as necessary. Emphasize construction, operation methods and features that will
cause physical manipulation of the environment or will produce wastes. Include modifications to
existing equipment or industrial processes and significant demolition, removal or remodeling of
existing structures. Indicate the timing and duration of construction activities.
The Stonex site includes mining gravel and sand from an 80 -acre parcel located 0.25 miles south
of County Road 38 and 0.25 miles west of CSAH 71Blaine Avenue in Rosemount, MN. This site
is immediately south of the V esterra gravel mine operation. The purpose of this mining facility is
to provide an additional source of construction sand and gravel aggregates in the Twin Cities
metropolitan area.
The land is currently being used for agricultural purposes. The mine will remove up to fifty feet
of material from the property. This will bring the higher ground down to approximately the same
elevation as the north -east comer of the property, and the flat farmland to the east. Finished
grades will be sloped gently to the north -east, which will not significantly change current surface
water drainage patterns.
Mining will commence more or less on the east end of the property, but to the west of the farm
buildings where the activity will be essentially invisible from surrounding properties except the
parcel to the north which has previously been issued a mining permit. Mining will then proceed in
an orderly fashion to the south and west property boundaries, finishing the grading at the east end
last after the farm buildings have been removed. Owing to the site contours, very little of the mine
face will be exposed to public view at any given time. No more than 15 acres of open floor will be
left un- reclaimed at any time.
Much of the area to be mined has the underlying deposit showing at the surface, so the amount of
stripping to be done will be minimal. Those areas that do need to be stripped will provide the
source of material for berms, and this is also where the topsoil will be stored that will be used for
reclamation at the completion of each phase of the mine. Additional topsoil may need to be
brought in to complete the reclamation process.
Equipment to be used in the mining process is expected to be front -end loaders, conveyors,
screens, and crushing and washing equipment. No blasting will take place at the site. In order to
comply with Minnesota weights and measures statutes, a weigh -scale will be installed along with a
small temporary office for the scale operator and site manager. Some small concrete pads will be
used to anchor the processing equipment, but these will be easily removed once mining is
complete. It is likely that the first year of mining will employ fully portable equipment. This will
enable proper preparation of the site for the fixed installation.
The washing operation will require the use of a well and a two -stage settling pond system. It is
intended that all water used for the operations will be recycled, infiltrate back into the ground, or
evaporate. No chemicals of any kind will be used in the processing of the sand and gravel, with
the exception of surfactants if a wet suppression system is needed. Hours of operation will be
consistent with the City of Rosemount ordinance.
Page 2 of 1
Jule 9, 2004
There are approximately 6 homes within 0.25 miles of the site. Most of these homes are along
Blaine Avenue. Of these homes, the Kraft farmstead and buildings are located within the project
area in the north -east corner. This area will be left undisturbed until the family has moved out
sometime prior to May, 2007. The house and buildings will then be rented out while mining
continues. The City's ordinance requires screening provisions for homes within 0.25 miles of the
mining operation. The project proposer will work closely with any neighbors that might have
concerns about the operation and will mitigate any issues that might arise. Natural contours will
be used as far as possible to screen activities from neighbors and the public.'
The farmland will continue to be cultivated until mining occurs. The original farmhouse, barn and
outbuildings, together with the established trees, will remain during the mining process and will
help to screen operations. The buildings and some of the trees will be removed at the end of the
mine life so that the land can be graded to blend with the rest of the site. A four to one slope will
be graded up at the east end of the property to blend in with the treed area on the adjacent Flint
Hills property.
The duration of the operation is expected to be approximately fourteen years, assuming a
production rate of approximately five hundred thousand tons annually. As mining proceeds in
phases of approximately five acres per annum, the property will be sloped on the western,
southern and eastern boundaries at grades of no more than four to one and be completed to meet
the requirements of the City. Topsoil will be spread at a depth of no less than four inches and
seeded with an appropriate mix in the event that it is not returned to an agricultural use in the
interim.
Ultimately, the end -use plan for this property will depend on zoning in the area as determined by
the City, but the mine floor will be left in a condition suitable either for agriculture or for
development. The site immediately north is currently being mined for sand and gravel. The
cumulative impacts on the area are primarily related to traffic and water use. The ultimate end -use
plan will include grading these two areas to match the grade between their boundaries. The area
may be used for a future park or recreation area.
c. Explain the project purpose; if the project will be carried out by a governmental unit, explain
the need for the project and identify its beneficiaries.
This project will be carried out by a private company. There are two primary purposes for this
project:
• To remove sand and gravel resources from this area.
• To grade the property so that its ultimate end -use potential for agriculture, recreation, open
space or development is maximized.
d. Are future stages of this development including development on any outlots planned or likely to
happen? _Yes x No
If yes, briefly describe future stages, relationship to present project, timeline and plans for
environmental review.
Subsequent uses of this property will depend on end -use plans that are yet to be developed by the
City of Rosemount. Current designation is Agricultural within the twenty-year Rosemount
Comprehensive Plan, so the current plan would be to restore the property for agricultural use.
There is preliminary discussion related to using both the mining area north of Stonex and the
Stonex property as a recreational area as part of an ultimate end -use plan.
e. Is this project a subsequent stage of an earlier project? x Yes _No
If yes, briefly describe the past development, timeline and any past environmental review.
A mining operation has previously been approved for the seventy-five acre parcel lying immediately to
Page 3 of 15
July 9, 2004
the north of Stonex. An EAW was completed during 2003 and was concluded by a Negative
Declaration of Finding by the City of Rosemount in early summer 2003. Mining commenced on that
parcel in the spring of 2004.
7. Project magnitude data
Total project acreage 80 acres
Number of residential units: unattached n/a attached n/a maximum units per
building
Commercial, industrial or institutional building area (gross floor space): total square feet
n/a
Indicate areas of specific uses (in square feet):
Office n/a Manufacturing n/a
Retail n/a Other industrial n/a
Warehouse n/a Institutional n/a
Light industrial n/a Agricultural n/a
Other commercial (specify) n/a
Building height: Stockpiles and the plant may be up to thirty feet high, but will still be significantly
lower than the prevailing land height to the west, south and east. Viewed from Co 71 to the east these
will be nearly one half mile away and will not break the skyline. The location of the anticipated six
stockpiles is shown on Appendix B. These stockpiles will be at their largest at the end of the
production season, and at the smallest in the spring. The pile that will grow to be the largest is the
coarse sand, simply because it represents the bulk of the deposit. The footprint of the sand pile will be
approximately 30ft high x 300ft long by 150ft wide, for approximately 75,000 tons of storage. Total
inventory in the fall of all products would be unlikely to exceed 100,000 tons.
8. Permits and approvals required. List all known local, state and federal permits, approvals and
financial assistance for the project. Include modifications of any existing permits, governmental
review of plans and all direct and indirect forms of public financial assistance including bond
guarantees, Tax Increment Financing and infrastructure.
Unit of government
Type of application
Status
City of Rosemount
Mine permit
To be obtained
City of Rosemount
WCA Permit
To be obtained, if needed
MPCA
NPDES storm water permit
To be obtained
MPCA
Air permit
To be obtained, if needed
MN DNR
Water appropriation
To be obtained
Mine Safety and Health
Administration
Register the mine
To be obtained
Dakota County Highway
Department
Access permit
To be obtained
The proposed project will require a mining permit to be obtained from the City of Rosemount. As part
of that review process, an enhanced end -use plan will be required to be developed that complements the
adjacent properties for future commercial/industrial development.
9. Land use. Describe current and recent past land use and development on the site and on adjacent
lands. Discuss project compatibility with adjacent and nearby land uses. Indicate whether any
potential conflicts involve environmental matters. Identify any potential environmental hazards
due to past site uses, such as soil contamination or abandoned storage tanks, or proximity to
nearby hazardous liquid or gas pipelines.
The project is in an area that is currently and historically primarily agricultural. Current agricultural use
is primarily row -crops and hay /pasture. Six residences lie within a quarter mile of the subject property.
Information from the MPCA indicates that there are no known contaminants within the project site.
Page 4 of 15
July 9, 2004
Based on previous studies completed by others for the eastern Rosemount area, there are known
groundwater contaminant plumes of the aquifer located approximately 1 mile away from the site to the
east. As indicated from the County, the flow of groundwater in this area is to the northeast.
There are no underground tanks on the property. There is one septic tank and drainfield serving the
house. There is one residential well used by the home. These will be removed and/or capped in
conformance with State regulations once the homestead is no longer in use.
All the properties surrounding the project area are currently being used for agriculture. The property to
the north is already permitted as a sand and gravel mine, and the property to the east is owned by Flint
Hills Resources as part of the buffer zone for the Pine Bend Refinery. There are a number of pipelines
criss- crossing the general area, but none that are directly affected by this proposal. The closest pipeline
is located well to the west of the project area. There are high voltage lines located along the south side
of the property but these will not be disturbed by mining. The mining will not encroach on the utility
easement.
The project will take place on land that has been used exclusively for agriculture. Based on the soil
boring information and anticipated depths for mining, the mining activity will take place entirely above"
the groundwater table.
Material will be picked up with a wheeled front -end loader at the mine face and deposited into a hopper,
from where it will be conveyed to a surge (holding) pile, which is used to even out flow to the
processing plant. Material is then pulled from the surge pile by a variable feeder and conveyed to a
wash screen where pressurized water jets, together with an inclined double or triple deck screen are
used to separate out the different components of gravel and sand. The sized gravel products are
conveyed and discharged directly onto the stockpiles. The wet sand is conveyed or pumped to a sand
classification system where the different sized sand particles are sorted out into fine sand, coarse sand,
and probably grit. All of this process is a wet process. The dirty water will be pumped or gravity
drained to the settling ponds. At the opposite end of the ponds, the clarified water will be reclaimed and
used again, as much as possible. Additional water will be drawn from a new well that will be located
near the wash plant.
In addition to the process mentioned above, there will be a crusher located somewhere in the system,
although the exact location has yet to be determined based on what the customers require and
manufacturers recommend. It will either be between the pit -face hopper and the surge pile, or after the
screen. The material will be fed damp into the crusher, and a mist sprayer will be used to wet down any
dust coming out of the crusher.
The largest impact on the surrounding community will be truck traffic. It is estimated that 130 trucks
will be leaving the mining site on a typical ten -hour day during the construction season, an average of
13 truck loads per hour. Haul routes have been designated on County Roads 71 and 42 (limited to the
west on the latter) and 117` Street. Traffic considerations are also addressed in Item 21. A full analysis
of traffic operations is covered in a memorandum identified as Appendix C of this EAW.
10. Cover types. Estimate the acreage of the site with each of the following cover types before and
after development:
If Before and After totals are, not equal, explain why.
11. Fish, wildlife and ecologically sensitive resources
Page S of 15
July 9, 2004
Before
After
Before
After
Types 1 -8 wetlands
0
0.
Lawn/landscaping
1
0
Wooded/forest
0.5
0.5
Impervious surfaces
1
0
Brush/Grassland
10
17
Other describe
Cropland
67.5
62.5
TOTAL
80
80
If Before and After totals are, not equal, explain why.
11. Fish, wildlife and ecologically sensitive resources
Page S of 15
July 9, 2004
a. Identify'fish and wildlife resources and habitats on or near the site and describe how they
would be affected by the project. Describe any measures to be taken to minimize or avoid
impacts.
Based on a site visit and historic aerial photo review, the site is and has been in agricultural
production since at least 1937. There is little habitat for wildlife on the property with the
exception of the large trees around the old farm buildings, which will be left undisturbed as much
as possible when final grading is done. There is a small corridor of wooded area to the south east
of the property. Care will be taken along the south half of the east end to ensure that there is no
damage to the trees on the Flint Hills property to the east.
b. Are any state - listed (endangered, threatened or special concern) species, rare plant
communities or other sensitive ecological resources such as native prairie habitat, colonial
waterbird nesting colonies or regionally rare plant communities on or near the site?
Yes X No
If yes, describe the resource and how it would be affected by the project. Indicate if a site
survey of the resources has been conducted and describe the results. If the DNR Natural
Heritage and Nongame Research program has been contacted give_the correspondence
reference number: ERDB 20040812 is attached as Appendix B.
Describe measures to minimize or avoid adverse impacts.
Not applicable
12. Physical impacts on water resources. Will the project involve the physical or hydrologic
alteration— dredging, filling, stream diversion, outfail structure, diking, and impoundment
of any surface waters such as a lake, pond, wetland, stream or drainage ditch? _Yes x No
If yes, identify water resource affected and give the DNR Protected Waters Inventory number(s)
if the water resources affected are on the PWI: NA Describe alternatives considered and
proposed mitigation measures to minimize impacts.
The site was reviewed for potential impacts to surface water resources such as wetlands, ponds or
watercourses. Data sources such as the National Wetland Inventory, Minnesota Department of
Natural Resources Protected Waters Inventory, City of Rosemount Wetland Inventory and the Dakota
County Soil Survey were reviewed for indications of potential wetlands on the site. The National
Wetland Inventory depicts one PEMC (Circular 39 Type 3) wetland on this parcel. The DNR
Protected Waters Inventory for Dakota County did not depict any Public Waters or Water Courses
within the proposed project site area. The City of Rosemount Wetland Inventory (1999) indicated that
a (Circular 39) Type 1 wetland was located on the project site west and upslope of the farmstead. The
City has assigned a "Utilize" management classification to this basin. This classification means that
wetlands of this type should be considered for sequencing flexibility for use within the City's
stormwater management system. This classification is typically assigned to wetlands of lesser natural
integrity having low functions and values. The Dakota County Soil Survey did not depict zones of
hydric soils within the project area. Soils were typically characterized as being well - drained, very
well- drained, or excessively well - drained.
A field review of the site was conducted in January 2003 by Sanders, Wacker, Bergly, Inc for potential
wetlands on the site, with final verification work conducted in May of 2003. The entire site was
assessed for the presence of wetland. No areas existed on the site that met the criteria set forth in the
1987 Wetland Delineation Manual for jurisdictional wetland, even in areas indicated on the National
Wetland Inventory and the City inventory. The site was fully cropped in corn, soybeans and non-
native pasture grasses. Therefore, no wetland impacts are proposed as part of this project.
13. Water use. Will the project involve installation or abandonment of any water wells, connection to
or changes in any public water supply or appropriation of any ground or surface water
Page 6 of 15
July 9, 2004
(including dewatering)? x Yes No
If yes, as applicable, give location and purpose of any new wells; public supply affected, changes
to be made, and water quantities to be used; the source, duration, quantity and purpose of any
appropriations; and unique well numbers and DNR appropriation permit numbers, if known.
Identify any existing and new wells on the site map. If there are no wells known on site, explain
methodology used to determine.
Currently a domestic well supplies the Kraft property and this will continue to be used to supply the
residents during the life of the proposed project. When the farm buildings are removed at the end the
project or when the homestead is no longer in use, this well will be properly sealed and abandoned.
The project will involve the use of groundwater recovered through a well for the purpose of washing
aggregates. The well will be located next to the processing plant to the west of the farm buildings. It
is intended to re- circulate water from the settling ponds as much as possible, depending on the loss
through infiltration and evaporation. An appropriation permit for a new well will be sought from DNR
subject to equipment supplier recommendations as to the amount of water that will be needed to
effectively operate the wash plant. The exact amount of water required will depend on the final plant
configuration and the loss of water through evaporation and infiltration. Maximum water volume
needed to operate the plant will be 2,500 -3,000 gallons per hour, so the make -up water from the well
will be something less than this. This well would be useful for irrigation if the property remains
agricultural in use.
Information from the County indicates the direction of groundwater flow is towards the northeast. The
Darsow well is located about 0.5 miles upgradient of the Stonex site. The Kraft well is located about
500 feet from the proposed well for the Stonex site. The groundwater appropriations permit
application to the DNR will be address a contingency plan in the event that well interference,
groundwater depletion, or groundwater pollution occurs.
No hazardous material that could contaminate the groundwater is anticipated to be located on -site. If
groundwater contamination appears to be possible during the permit review process, the City will
require a pond liner for the treatment area.
14. Water - related land use management district. Does any part of the project involve a shoreland
zoning district, a delineated 100 -year flood plain, or a state or federally designated wild or scenic
river land use district? _Yes X No
If yes, identify the district and discuss project compatibility with district land use restrictions.
15. Water surface use. Will the project change the number or type of watercraft on any water body?
a. _Yes X No
If yes, indicate the current and projected watercraft usage and discuss any potential
overcrowding or conflicts with other uses.
16. Erosion and sedimentation. Give the acreage to be graded or excavated and the cubic yards of
soil to be moved:
Acres 80 Cubic yards 4.5 million
Describe any steep slopes or highly erodible soils and identify them on the site map. Describe any
erosion and sedimentation control measures to be used during and after project construction.
Information from the Dakota County Soil Survey and Highly Erodible Soils Map Unit List indicate
that the following soil are highly erodible or potentially highly erodible:
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July 9, 2004
Waukegan Silt Loam, 1 to 6 % slopes: Potentially Highly Erodible
Hawick Coarse Sandy Loam, 6 to 12 % slopes: Potentially Highly Erodible
Hawick Coarse Sandy Loam, 12 to 18 % slopes: Highly Erodible
Hawick Coarse Sandy Loam, 18 to 25 % slopes: Highly Erodible
There are steep slopes of natural origin to the south of the farmstead. These are currently planted with
non- native pasture grasses and legumes, and this will remain the case until mining commences.
There is little topsoil on the site, and the primary stockpiling locations for topsoil will be in berms
along the western and southern sides of the operations. These stockpiles will be landscaped and
seeded with an appropriate grass mix, using silt fence while the grass becomes established.
Once mining and grading of side -walls around the mine is completed in phases, the affected areas will
be covered with topsoil and seeded. The maximum side slope allowed is 4:1 per the City
requirements. Silt fences will be used as needed, but wherever possible any surface water will be
directed into the floor of the pit, and then into the settling ponds. The Stonex area will be graded to
match into the grades to the north with the Vesterra gravel mine.
17. Water quality: surface water runoff
a. Compare the quantity and quality of site runoff before and after the project. Describe
permanent controls to manage or treat runoff. Describe any stormwater pollution prevention
plans.
In the existing conditions, the site generates approximately 5.2 acre - feet, 12.1 acre -feet, and 21.8 acre-
feet of runoff for the 2 -year, 10 -year, and 100 -year event, respectively. Water is generally directed
from the west to the east/northeast and discharges to the Flint Hills Resources property along the site's
eastern border.
During mining activities, the site is anticipated to generate additional storm water runoff and increase
the rate of discharge from the site. However, a settling pond area will be constructed on the site and
storm water will be directed to the pond for rate control and treatment. This pond will be designed to
meet City standards for rate control and treatment. It is anticipated that most water will infiltrate on
the site due to the sandy soil conditions.
The settling ponds will be approximately 100' by 50', excavated 10' below the prevailing area and
bermed three to five feet high around the edges using the excavated material There will be a weir
separating the coarse (first) pond from the fine (second) pond, with further sectioning and weirs
created within the ponds to slow down the water. A pump at the far end of the second pond will re-
circulate water to the wash plant. On an as- needed basis, the accumulated fines will be dug out of the
settling ponds using a front -end loader or backhoe, and stockpiled adjacent to the settling ponds until
dry, whereupon they will likely be sold as fill material. This design will be further reviewed as part of
the plan review process.
b. Identify routes and receiving water bodies for runoff from the site; include major downstream
water bodies as well as the immediate receiving waters. Estimate impact runoff on the quality of
receiving waters. "
Water is generally directed from the west to the east /northeast and discharges to the Flint Hills
Resources property along the site's eastern border.
The wash water used to rinse the sand and gravel will contain fine sand and silt particles, but no other
introduced chemicals or treatments. The settling ponds will be cleaned out periodically, and the most
likely use of this material is that it will be allowed to dry out and then be sold as fill material.
Alternatively, it may be mixed in as part of the reclamation activities to boost soil fines and nutrients.
With the ponding areas on -site, water quality downstream is not anticipated to be negatively impacted.
Page 8 of 15
Aly 9, 2004
The end -use plan will incorporate appropriate storm water ponding to meet the City's rate control and
treatment requirements if it is used for anything other than agriculture.
18. Water quality: wastewaters
a. Describe sources, composition and quantities of all sanitary, municipal and industrial
wastewater produced or treated at the site.
On -site sanitary facilities will most likely involve one or two portable toilets serviced on a regular
basis.
b. Describe waste treatment methods or pollution prevention efforts and give estimates of
composition after treatment. Identify receiving waters, including major downstream water
bodies, and estimate the discharge impact on the quality of receiving waters. If the project
involves on -site sewage systems, discuss the suitability of site conditions for such systems
Not applicable.
c. If wastes will be discharged into a publicly owned treatment facility, identify the facility,
describe any pretreatment provisions and discuss the facility's ability to handle the volume and
composition of wastes, identifying any improvements necessary.
Not applicable.
d. If the project requires disposal of liquid animal manure, describe disposal technique and
location and discuss capacity to handle the volume and composition of manure. Identify any
improvements necessary. Describe any required setbacks for land disposal systems.
Not applicable.
19. Geologic hazards and soil conditions
a. Approximate depth (in feet)
To ground water:
Minimum 25 feet average not known
To bedrock:
Minimum 25 feet average >60 feet
Describe any of the following geologic site hazards to ground water and also identify them on the
site map: - sinkholes, shallow limestone formations or karst conditions. Describe measures to
avoid or minimize environmental problems due to any of these hazards.
Information from five drill holes across the property and the Dakota County Soil Survey indicate that
only sand and gravel are present on site to a depth of fifty feet. Only one boring in the south central
part of the property appeared to encounter bedrock of St. Peter Sandstone at 51 feet. None of the
borings encountered ground water. Ground water was not encountered above approximately 886 feet,
and a borehole on the property to the north did not encounter ground water at 830 feet. The floor of
the finished pit will be above 870 feet.
Information from Dakota County indicates that the project area is within the Rich Valley area that is a
covered karst valley. Due to this geologic factor that that the area is covered in outwash sand and
gravel sediments, storm water infiltration is rapid and the-potential for groundwater contamination is
high. However, the site is not anticipated to contain any hazardous materials, thereby reducing the risk
Page 9of15
July 9, 2004
of groundwater contamination. Additionally, the mining operation is anticipated to be at least 30'
above the groundwater elevation in the area.
b. Describe the soils on the site, giving NRCS (SCS) classifications, if known. Discuss soil
granularity and potential for groundwater contamination from wastes or chemicals spread or
spilled onto the soils. Discuss any mitigation measures to prevent such contamination.
Information from the Dakota County Soil Survey indicates that the following soils are present on the
site:
Hawick coarse sandy loam
Hawick loamy sand
Waukegan silt loam ,
Kanaranzi loam
Wadena loam
Kennebec silt loam
Lindstrom silt loam
Soils on the site are generally thinner and sandier on the high ground and thicker in the swales.
The soils and the underlying materials are very clean and granular in nature, theoretically resulting in a
high potential for groundwater contamination in the event of waste or chemical spills. However, as
noted above, the use and generation of such materials will be minimal, and operations will remain well
above the water table.
20. Solid wastes, hazardous wastes, storage tanks
a. Describe types, amounts and compositions of solid or hazardous wastes, including solid animal
manure, sludge and ash, produced during construction and operation. Identify method and
location of disposal. For projects generating municipal solid waste, indicate if there is a source
separation plan; describe how the project will be modified for recycling. If hazardous waste is
generated, indicate if there is a hazardous waste minimization plan and routine hazardous waste
reduction assessments.
There will be no solid or hazardous wastes generated on the site with the possible exception of a
solvent based parts cleaner used in the maintenance of heavy vehicles. Disposal of such materials will
be through an approved company such as Safety Kleen, Inc., and this would not involve classification
as anything more than a Very Small Quantity Generator. In addition, the wash -water fines noted above
consisting of fine sand and silt particles will be contained in settling ponds. These ponds will be
dredged out as required and the dried fines will either be used in on -site reclamation activities or sold
for use as fill.
b. Identify any toxic or hazardous materials to be used or present at the site and identify
measures to be used to prevent them from contaminating groundwater. If the use of toxic or
hazardous materials will lead to a regulated waste, discharge or emission, discuss any
alternatives considered to minimize or eliminate the waste, discharge or emission.
N/A
c. Indicate the number, location, size and use of any above or below ground tanks to store
petroleum products or other materials, except water. Describe any emergency response
containment plans.
There are no known underground storage tanks. It is likely that the proposed operations would involve
the use of a 500 - gallon, MPCA approved and certified, above ground storage tank. The ground where
the tank is located will be contained with an impermeable liner or container.
Page 10 of 15
July 9, 2004
21. Traffic- CTR
Parking spaces added - six temporary for use of employees.
Existing spaces (if project involves expansion) - none.
Estimated total average daily traffic generated.
Assuming a peak extraction of 500,000 tons per year and a seasonal and daily distribution of demand,
it is estimated that the peak traffic volume will be 200 loads per day. (Calculations documenting the
estimated average daily traffic are contained in Appendix C.)
Estimated maximum peak hour traffic generated (if known) and time of occurrence. Provide an
estimate of the impact on traffic congestion on affected roads and describe any traffic
improvements necessary. If the project is within the Twin Cities metropolitan area, discuss its
impact on the regional transportation system.
Assuming the peak daily traffic of 200 loads per day, as noted above, and a daily pattern weighted
toward mornings, it is estimated that there will be 150 loads leaving the mining area in the first five
hours of the day resulting in a peak hour volume of 30 loads per hour. (A full analysis of traffic
operations associated with the mining activity, including the impacts on the roadway system in the area
is covered in a memorandum identified as Appendix C of this EAW. Calculations documenting the
peak hour traffic volumes are contained therein.)
22. Vehicle- related air emissions. Estimate the effect of the project's traffic generation on air quality,
including carbon monoxide levels. Discuss the effect of traffic improvements or other mitigation
measures on air quality impacts. Note: If the project involves 500 or more parking spaces,
consult EAW Guidelines about whether a detailed air quality analysis is needed.
The only vehicles permanently on site will be two or three large front -end loaders. Delivery trucks
will also be traveling in and out of the facility. It is not anticipated that this level of activity will result
in any problem with vehicle - related air emissions. Professionals familiar with this type of operation
concur with this view.
23. Stationary source air emissions. Describe the type, sources, quantities and compositions of any
emissions from stationary sources of air emissions such as boilers, exhaust stacks or fugitive dust
sources. Include any hazardous air pollutants (consult EAW Guidelines for a listing) and any
greenhouse gases (such as carbon dioxide, methane, nitrous oxide) and ozone- depleting
chemicals (chlorofluorocarbons, hydrofluorocarbons, perfluorocarbons or sulfur hexafluoride).
Also describe any proposed pollution prevention techniques and proposed air pollution control
devices. Describe the impacts on air quality.
The most prevalent source of fugitive dust in an operation such as this is from on- and off -road
wheeled vehicles as they move around. Dust control measures will be employed as follows: regular
reclamation and planting/seeding of berms and pit floor will keep exposed soils to a minimum, and
roads will be regularly sprayed with water. In addition, the much lower elevation of the mine floor
will tend to protect it from westerly winds that may pickup dust. The Kraft residence is located on
the northeast corner of the site. The project proposer will work with the residents to address dust,
including spraying the road with water.
24. Odors, noise and dust.
Will the project generate odors, noise or dust during construction or during operation?
X Yes No
Page 11 of 15
July 9, 2004
If yes, describe sources, characteristics, duration, quantities or intensity and any proposed
measures to mitigate adverse impacts. Also identify, locations of nearby sensitive receptors and
estimate impacts on them. Discuss potential impacts on human health or quality of life. (Note:
fugitive dust generated by operations may be discussed at item 23 instead of here.)
Dusts
Using table EC10.1 from the MN Pollution Control Agency Form EC 10, calculations of annual PM
and PM10 emissions were made based on the plant layout shown on the attached plans. Annual
production of sand and gravel was assumed to be 500,000 tons. The deposit was assumed to have
moisture content of greater than or equal to 1.5 %. If actual moisture content falls below this level then
a wet suppression system will be installed.
Based upon these calculations, the plant will actually emit 4,823 lbs of PM and 636 lbs of PM 10
annually. The theoretical maximum annual emissions of PM and PM 10 are 16.9 tons and 2.2 tons
respectively, based on 400 tons per hour for 8760 hours per annum. This would put the operation well
below the federal and state thresholds requiring a Title V permit.
Odors:
There will be no odors generated from this operation.
Noise:
The equipment used for mining and processing materials will create noise. However, any noise
generated will be well within MPCA guidelines as measured at the property boundaries, since the plant
will be located close to the middle of the property and will be enclosed by forty-foot high banks on
three sides. Flint Hills Refinery is the on the open side.
25. Nearby resources. Are any of the following resources on or in proximity to the site?
Archaeological, historical or architectural resources?
_Yes X No
A cemetery is located southeast of the site at the comer of CSAH 42 and CSAH 71. However, it will
not be impacted by the project. Further, the State Historic Preservation Office concluded that there are
no known historic or archeological properties that will be affected by this project. See e-mail from
SHPO attached as Appendix B.
Prime or unique farmlands or land within an agricultural preserve?
X Yes No
The two properties to the west of the subject property are enrolled in the Agricultural Preserve
program. Both owners have given notice of withdrawal from the Program, one recently and the other
approximately two years ago. A soils map for the area is included in Appendix B. It is likely that the
farmland in this area will be lost to development in the not too distant future, regardless of whether
mining occurs or not, although the current City Comprehensive Plan shows this area as Agricultural.
Designated parks, recreation areas or trails?
Yes X No
The City's longterm plan for the area includes the potential for developing this area into a park or
recreation area. No specific plans have been developed to date. If the area is to be used as parkland in
the future, the end -use plan will reflect this future use.
Scenic views and vistas?
Page 12 of 15
July 9, 2004
_Yes X No
The skyline in this area is dominated by the Flint Hills refinery, and by numerous utility lines that
cross the open farmland resulting in a generally industrial viewscape.
Other unique resources?
_Yes X No
If yes, describe the resource and identify any project - related impacts on the resource. Describe
any measures to minimize or avoid adverse impacts.
26. Visual impacts. Will the project create adverse visual impacts during construction or operation?
Such as glare from intense lights, lights visible in wilderness areas and large visible plumes from
cooling towers or exhaust stacks?
_Yes X No
If yes, explain.
None of the visual impacts discussed in the EAW Guidelines (e.g. intense lights creating glare, strobe
lights on a communications tower, large water vapor releases from and exhaust stack) or similar visual
impacts will result from the proposed mine. Vehicles on Co.71 and Co.38 will probably be able to see
some signs of activity, but from a quarter mile away at the closest. Generally, the mine face will
advance to the west, leaving the open face always directed toward the Flint Hills refinery.
27. Compatibility with plans and land use regulations. Is the project subject to an adopted local
comprehensive plan, land use plan or regulation, or other applicable land use, water, or resource
management plan of a local, regional, state or federal agency?
X Yes No.
If yes, describe the plan, discuss its compatibility with the project and explain how any conflicts
will be resolved. If no, explain.
The project area is subject to the Rosemount Comprehensive Plan, and the subject property lies within
an area in which mining activities were recently approved by the City Council as an interim use. This
area is designated as Agricultural for the foreseeable future, but the proximity to the Flint Hills
Refinery and to major haul roads are such that the long -term uses are more likely to be
commercial/industrial in nature.
This project is also subject to the City's Comprehensive Storm Water Management Plan and will be
required to meet the requirements of this Plan.
28. Impact on infrastructure and public services. Will new or expanded utilities, roads, other
infrastructure or public services be required to serve the project?
X Yes No.
If yes, describe the new or additional infrastructure or services needed. (Note: any infrastructure
that is a connected action with respect to the project must be assessed in the EAW; see EAW
Guidelines for details.)
A Traffic -Study is attached as Appendix C. It is possible that upgrades to the pavement on County 71,
or turning and acceleration lanes may be recommended as traffic in this area increases. Given that
Page 13 of 15
July 9, 200
138' Street was not designed for the heavy truck loading that will occur with the gravel hauling
operations, Stonex, LLC will be expected to maintain the road in a safe and serviceable condition as
long as hauling operations continue. At such time that mining operations cease, Stonex, LLC will be
expected to restore 138 Street to a safe and serviceable condition as part of the overall final grading
and restoration of the mining site. Upon completion, the road's condition shall be at least equivalent to
its condition prior to the beginning of hauling operations.
29. Cumulative impacts. Minnesota Rule part 4410.1700, subpart 7, item B requires that the RGU
consider the "cumulative potential effects of related or anticipated future projects" when
determining the need for an environmental impact statement. Identify any past, present or
reasonably foreseeable future projects that may interact with the project described in this EAW
in such a way as to cause cumulative impacts. Describe the nature of the cumulative impacts and
summarize any other available information relevant to determining whether there is potential
for significant environmental effects due to cumulative impacts (or discuss each cumulative
impact under appropriate item(s) elsewhere on this form).
The City of Rosemount approved mining as an interim use in the area east of Almon Avenue, south of
135 St, north of County 42 and west of County 71, with the exception of properties covered under the
Agricultural Preserve program.
The Vesterra mine site is located immediately to the north for the Stonex site. The combined total
acreage of the Vesterra and Stonex sites is 155 acres. The cumulative impact on this area includes the
removal of up to 14.5 million tons of gravel and sand. Between the two sites' 155 acres,
approximately 30 acres will be open for mining at one time. By phasing this work, impacts to the area
will be minimized. These areas combined, while offering open space, do not offer significant habitat
for wildlife. Wildlife that may be present on these properties are those that are adapted to agricultural
settings with frequent plowing, harvesting, and soil disruption. There is a wooded area located off of
the property to the southeast. This area will not be disturbed as part of the mining operations, so this
cover will continue to be available for wildlife in the area. Additionally, the end -use of the site will
either return to an agricultural use or be used for park and open space, thus mitigating the long -term
impacts on the site. The end -use grading plan is shown in Appendix A.
Currently, the Vesterra site is processing dry and no groundwater is being pumped. This could also
occur on the Stonex site. If a well and groundwater pumping is needed at some point in the future,
permits from the DNR will be required. If, however, a well is needed, the maximum potential
groundwater use for the two mines is 8 -10 million gallons per year. The exact amount of water
required will depend on the final plant configuration and the loss of water through evaporation and
infiltration. Groundwater appropriation will be addressed through the DNR permitting process.
The additional truck traffic with two mining operations in the area is anticipated to have a temporary
cumulative impact on the area. As the two sites are very similar in terms of the quantities to be
removed and the type of mining and hauling operations, it is conceivable, although rather unlikely, that
as many as 400 loads per day or 60 loads in the peak hour could be leaving the two sites in the event
that peak operations occur simultaneously at the two sites. It should be noted, however, that the traffic
levels of service and delay anticipated at the key intersection on the designated haul road intersections'
was determined with the assumption that hauling operation from the Vesterra site would be underway.
Therefore, the combined operations were already accounted for in the traffic study that is attached as
Appendix C to this report.
30. Other potential environmental impacts. If the project may cause any adverse environmental
impacts not addressed by items 1 to 28, identify and' discuss them here, along with any proposed
mitigation.
The proposed mine in not anticipated to cause any impacts other than those already mentioned.
31. Summary of issues. Do not complete this section if the EAW is being done for EIS scoping, instead,
Page 14 of 15
July 9, 2004
address relevant issues in the draft Scoping Decision document, which must accompany the EA W.
List any impacts and issues identified above that may require further investigation before the
project is begun. Discuss any alternatives or mitigative measures that have been or may be
considered for these impacts and issues, including those that have been or may be ordered as
permit conditions.
1) Traffic - The addition of truck traffic on local county roads will be reviewed by the County
Engineer. The applicant will cooperate with any mitigation measures brought forward by the
County Engineer.
2) Noise and Dust - All operations will be conducted in a professional manner and will be within
state guidelines. The applicant will work closely with neighbors to ensure that problems are
addressed in a timely manner. It is intended to push the processing plant and associated activities
as far back into the hillside as practical to maximize the screening.
3) Visual Impacts — Berms and plantings will be used to screen those parts of the operation that are
open to view. However, the activities will be surrounded on all sides by the natural landscape,
resulting in virtually no visual impact as far as the general public is concerned.
4) Storm Water — The project is anticipated to generate some additional storm water runoff. This
runoff will be treated within on -site ponding facilities to reduce the runoff rate leaving the site and
provide for storm water quality treatment.
5) Ground water appropriations: The maximum amount of groundwater use at the Stonex site is
estimated at 4 -5 million gallons per year. The mining operations will work to eliminate
interference with residential well operations and correct any problems, if they do arise.
Additionally, the project proposer will obtain and adhere to the DNR groundwater appropriation
permit.
RGU CERTIFICATION. The Environmental Quality Board will only accept SIGNED Environmental
Assessment Worksheets for public notice in the EQB Monitor.
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 Minnesota Rules, parts 4410.0200, subparts 9b and 60,
respectively.
• Copies of this EAW are being sent to the entire EQB distribution list.
Signature Date
Title
Page 15 of 15
July 9, 2004
Appendix A
Project Location and Site Features Maps
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Roads from Minnesota Department of Transportation me or under my direct supervision and that I am a duly Licensed
Topography, parcels and detailed cultural features from Dw" EXISTING C ONDITIO NS
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me or under my direct supervision and tl�at 1 am a duly Licensed
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City of Rosemount, Dakota County, MN
L eb r
Re No. 30063
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Dab: guy s, 2004
MAY -27 -2004 12:22 WSB & ASSOCIATES
May 27 04 12:07p Ken Hendren
May 11, 2004
111111
7635411700
Minnesota Department of Natural Resources
Natural Heritage and Nongame Research Program, Box 25
500 Lafayette Road
St. Paul, Minnesota 55155 -40__
Phone: (651) 296 -7863 Fax: (651) 296 -1811 E- mail: sarah.hoffmann @dnr.state.mn.us
P. 04/06
p.4
Jonathan Wilmshurst
Stonex, LLC
12741 Shannon Parkway
Rosemount, MN 55068
Re: R? quest for Natural Heritage information for vicinity of proposed Staner LLC Sand & Gravel Mine,
Tl 15N R19W Section 23, Dakota County
NHNRP Contact #: ERDB 20040812
Dear Mr. Wilmshurst,
The Minnesota Natural Heritage database has been reviewed to determine if any rare plant or
animal species or other significant natural features are mown 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.
I'Icast; be aware that review by inc I`'araral Heritage acid No 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.
Sincerely,
1� &
Sarah D. Hoffmann
Endangered Species Environmental Review Coordinator
encl: Invoice
DNR Infonnation:6_11 -296 -6157 - 1 -888- 646 -6367 - TTY: 651-296-5484 - 1 -800 -657 -3929
An Equal Opportunity Employer �W Printed on Recycles[ Paper Containing a
lvlinintunt of 10;f Post- C1111stlnler W aste
MAY -2? -2004 12:22 USB & ASSOCIATES ?635411 ?00 P.03/06
May 27 04 12:07p Ken Hendren 111111 p.3
it-age 1 DI 1
Subj: RE: Database search for EAW
Date: 5/13f2004 12:05:32 PM Central Daylight Time
From: thLo -mg s - .einaq _r@mnt L s.or g
To: Jona
Sent from the Internet LDetalls1
There are no archaeological sites or historic structures recorded in the Minnesota SHPO CRM databases for the
coordinates supplied.
The result of this database search does not include an assessment for archaeological site potential, or provide a
listing of all potential historic architectural properties. It represents only known and recorded archaeological sites
and historic architectural properties from the current SHPO databases. If you require an assessment for
archaeological site potential and/or historic architectural properties, you will need to hire a qualified archaeologist
and/or historian to provide this service. Please contact the SHPO by phone at 651 - 296-5434 or by email
I.nnshpo mnhs.oM for current fists of professional consultants in these fields.
Tom Cinadr
Survey and Information Management Coordinator
Minnesota State Historic Preservation Office
Minnesota Historical Society
345 Kellogg Boulevard West
St. Paul, MN 55102
551- 296 -5434
651 -282 -2374 (fax)
- - -- Original Message - --
Frorn: lonathanwilms@aol -com jmailto:lonathanwilms @aol.coml
Sent: Wednesday, May 12, 2004 5:06 PM
To: thomas.cinadr@mnhs.org
subject: Database search fear EAW
Tom:
To confirm our phone conversation of last week, please could you check your database for the
presence or likelihood of historical sites in T115 R19 Section 23 in Rosemount, Dakota County.
This is by way of research in the preparation of an EAW for a gravel mine permit.
Thank you,
Jonathan Wilmshurst
Stonex, LLG
Thursday, May 13, 2004 America Online: Jonathanwilms
Wemorandum
DATE: July MR, 2004
To: File
FROM: Joel Katz
RE: Stonex, LLC Sand and Gravel Mine
Traffic Study for EAW
Purpose of Study
The purpose of this study was to determine the traffic- related considerations with respect
to a proposed sand and gravel mining operation. The study was undertaken pursuant to
the requirement that traffic issues be addressed in an Environmental Assessment Work-
sheet (EAW) that is being prepared for the proposed mine.
This memorandum describes the process, assumptions, and analysis used in determining
impacts to the roadway system in the vicinity of the proposed mining operation. The ex-
isting and estimated traffic - related characteristics of the intersections adjacent to the pro -
posed mining site are documented herein.
Proposed Project
Stonex LLC is proposing to operate a sand and gravel mine with a crushing, washing, and
screening plant to provide an additional source of construction aggregates for the Twin
Cities metropolitan area. (A detailed description of the project is provided in the EAW.)
Location, Key Intersections
The mine site is located west of Dakota County State Aid Highway (CSAH) 71 (Blaine
Avenue) in the east central area of the City of Rosemount, Minnesota. It is immediately
adjacent to the southwest portion of the Flint Hills Refinery property. The site is about
one -half mile north of CSAH 42 (145' Street), the major east -west road through the city,
and about one and one- luarter males west of Minnesota Trunk Highway (TH) 52. The
location is shown in
also shows the location of the key intersections that were analyzed in the study:
■ CSAH 71 with CSAH 42
■ CSAH 71 with 138` Street (a private drive that is proposed to be the access from
CSAH 71 to the mine)
■ CSAH 71 with Dakota County Road 38
■ CSAH 71 with 117` Street
Trip Generation
Trip generation estimates used in this study were taken from information supplied by the
developer, Stonex, LLC. The estimate is based on industry experience and on gravel min-,
ing operations currently underway on property adjacent to the proposed mine site with a
common boundary on the north which is nearly identical in area and topography. The
following figures were submitted by the developer as background information for the
EAW.
It has been assumed that the peak extraction will be 500,000 tons of sand and gravel per
year. Given an average truckload of 20 tons, this would be equivalent to a total of 25,000
loads. It is also assumed that winter operations (50 working days) would be limited to
5,000 loads with the remainder, 20,000 loads, spread over the 150 working -day construc-
TA01191 -24 \Traffic Study\MEMORANDUM -- Stonex, LLC Sand '& Gravel Mine.doc
Memorandum to File
July W 2004
Page 2
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T101191 -24 \Traffic Study\MEMORANDUM -- Stonex, LLC Sand& Gravel Mine.doc
Memorandum to File
July a 2004
Page 3
tion season or an average of 133 loads per day. Allowances for weather and demand
variations leads to a prudent peak estimate of 200 loads per day.
A peak hour estimate of 30 loads has been determined based on construction industry
demand that tends to concentrate deliveries in the morning hours. Of the total daily peak
of 2O0 loads, it was assumed that 150 would be concentrated in the first five hours, or 30
loads per hour.
Trip Distribution
Information supplied by the developer indicates that the truck traffic will be equally dis-
tributed to the north and south on CSAH 71. As noted in the following paragraph, traffic
using CSAH 71 to the south will not be permitted to use CSAH 42 to the east.
Designated Routes
With the exception of deliveries in the immediate area (well less than 10 %), all trucks
will be required to exit the mining site to the east along the private farm road (East 138'
Street) to CSAH 71. From that intersection, trucks will be required to travel either north
to 117 Street and east to the soon- to -be- completed interchange with TH 52, or south to
CSAH 42. Stonex, LLC has agreed that loaded gravel trucks will be permitted to turn
only to the west on CSAH 42 so as to avoid the southbound to eastbound left -turn con -
flict with westbound through traffic on CSAH 42. (All truck traffic bound for TH 52 will
be directed via CSAH 71 to 117 Street.) The designated truck route is shown in
Intersection Lane Geometry and Current Traffic Counts
shows the existing lane geometry and the current AM and
PM peak hour turning movements at each of the key intersections. The turning move-
ments are based on traffic counts that were taken in June 2004 by WSB at the 138 Street
and County Road 38 intersections on CSAH 71. The turning data at the CSAH 42/ 117`
Street intersection was taken from counts obtained by Benshoof and Associates, Inc. in
2003.
The data at the intersection of CSAH 42 and CSAH 71 is from Mn/DOT counts refer-
enced by Benshoof. These counts were collected as part of recent TH 52 interchange
studies. Although WSB collected data at this intersection in June 2004, it was noted that
the southbound PM three -hour peak was generally three times the volume that was ob-
served in 2003. It has been assumed that the construction underway on the new TH
52/117 Street interchange encouraged drivers to divert to CSAH 71 and CSAH 42 to get
to TH 52. Thus, the turning movements at CSAH 42 especially the southbound to east-
bound left turn as counted in 2004 — are not representative of the normal traffic pattern.
Furthermore, it is likely that the traffic demand on CSAH 71 will fall below the 2003 lev-
els after the interchange is completed as the severe congestion that has existed at the TH
52/117 Street intersection will no longer be a factor in drivers' choice of routes.
Level of Service
The measure used to describe the traffic operations at an intersection is called "Level of
Service" (LOS). An intersection is given an LOS grade from "A" to "F" to describe the
average amount of delay per vehicle at the intersection over an hour period. LOS A is the
best traffic operating condition, and drivers experience minimal delay at an intersection
1 "Traffic Study for Proposed Gravel Mine in Rosemount, MN," memorandum, March 17, 2003.
Benshoof & Associates, Inc. (This study was carried out to determine traffic generation and levels
of traffic service for the intersections expected to be affected by the gravel pit now in operation
immediately to the north of the site covered by the present study.)
z Ibid.
T:\01191 -24 \Traffic Study\MEMORANDUM -- Stonex, LLC Sand & Gravel Mine.doc
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Memorandum to File
July N, 2004
Page 5
operating at that level. LOS E represents the condition where the intersection is at capac-
ity and some drivers may have to wait through more than one green signal phase to make
it through the intersection. LOS F represents a condition where there is more traffic than
can be handled by the intersection, and many vehicle operators may have to wait through
more than one green phase to make it through the intersection. Typically, LOS D is con-
sidered the minimum acce table LOS in an urban area. A graphical representation of
LOS is shown in
iMmig Service
summarizes the existing LOS and corresponding vehicle delay at the
four key intersections based on the lane geometry and traffic volumes shown in
The table indicates that an LOS well above an acceptable level exists at all four intersec-
tions.
Forecast Traffic and LOS
Given the trip generation and the distribution noted on , peak period turnip
movements attributable to the mining operation were computed and are shown in
LOS A = Excellent Conditions
LOS B = Good Conditions
LOS C = Average Conditions
LOS D = Acceptable Conditions
LOS E = Poor conditions
LOS F = Failing conditions
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T: \01191 -24 \Traffic Study \MEMORANDUM -- Stonex, LLC Sand & Gravel Mine.doc
Un- signalized Intersection
Memorandum to File
July, 2004
Page 6
MM . Existing Level of Service at Key Intersections
. It can be seen by comparing the total existing peak volumes as
2014 Traffic Forecast
It is anticipated that traffic volumes on roadways in this study will increase at an annual
rate of 1.9 percent. This rate was used by Mn/DOT in their traffic forecasts for the nearby
TH 52/117`h street interchange now under construction and reported by Benshoof in its
study for the adjacent gravel operation to the north. s Forecasted turning movements for
2014, including the gravel trucks, are shown in The corresponding
LOS and delay are depicted in
MM . Anticipated 2014 Level of Service at Key
Intersections Including Gravel Hauling Operations
AM Level
AlYI Dec ay
PM Level
PM Delay
Interseehon
pf Service
�eelVeh
- ; Serie
�$eeleli,
CSAH 71 /CSAH 42
A
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B
11.9
CSAH 71/138' St.
A
7.0
A
4.5
CSAH 71 /Co. Rd. 38
A
4.0
A
7.3
CSAH 71/117' St.
A
6.9
A
4.6
2014 Traffic Forecast
It is anticipated that traffic volumes on roadways in this study will increase at an annual
rate of 1.9 percent. This rate was used by Mn/DOT in their traffic forecasts for the nearby
TH 52/117`h street interchange now under construction and reported by Benshoof in its
study for the adjacent gravel operation to the north. s Forecasted turning movements for
2014, including the gravel trucks, are shown in The corresponding
LOS and delay are depicted in
MM . Anticipated 2014 Level of Service at Key
Intersections Including Gravel Hauling Operations
'Ibid.
T:\01191 -24 \Traffic Study\MEmoRANbum -- Stonex, LLC Sand & Gravel Mine.doc
AM Level
AlYI Delay
PM Level
FM Delay
Intersection
of Service
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of Service
CSAH 71 /CSAH 42
B
10.3
B
13.2
CSAH 71 /138' St.
A
8.1
A
5.0
CSAH 71 /Co. Rd. 38
A
4.5
A
8.3
CSAH 71/117` St.
A
7.9
A
5.3
'Ibid.
T:\01191 -24 \Traffic Study\MEmoRANbum -- Stonex, LLC Sand & Gravel Mine.doc
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Memorandum to File
July ®, 2004
Page 9
Truck Counts
At the request of the developer, a count was made of the number of trucks using CSAH
71 at three locations near the three southernmost of the key intersections in this study. At
two of the locations, the count also included an identification of the types of truck ob-
served. (This identification was not feasible at the CSAH 42 location due to the higher
traffic volume, speeds, and complexity of the intersection.) The data obtained in these
counts - taken at the same time the overall WSB turning movement counts were taken in
June 2004 — is shown in on following pages.
An examination of Tables 4, 5, and 6 suggests that as many as 17 loads were hauled in
the peak hour from the mining operation to the north (Vesterra, LLC) —well less than the
30 loads in the peak hour presumed from the site studied for this memorandum. Accord-
ing to Benshoof and the EAW filed for the northerly site, a peak hour total of 30 loads
was also forecasted for that site. It is noted that the two sites are nearly identical in size,
topography, and type of mining operation. Although mining operations have been under-
way for only a short time at the northerly site, the facts that construction activity is at a
high level this year, that the truck counts at the three locations taken on different days
seem to be consistent with one another, and that the weather was good during the traffic
counting periods may be an indication that the truck traffic forecasts are on the conserva-
tive side. In turn, it can be reasoned that the actual peak period LOS at the key intersec-
tions is not likely to be lower than that predicted in this memorandum.
Conclusions
Based on the analyses documented in this memorandum, WSB has concluded the follow-
ing:
• The CSAH 71 intersections are currently operating at essentially excellent LOS.
(Additional traffic is using CSAH 71 at the present time while an interchange is un-
der construction at the intersection of TH 52 and 117 Street. However, upon com-
pletion of that project, it can be expected that CSAH 71 traffic volumes will revert to
the levels previous to the construction and might be even less.)
• The addition of the hauling traffic from the proposed gravel site does not signifi-
cantly affect the LOS at the key intersections on CSAH 71
• LOS at the CSAH 71 intersections should remain at acceptable levels in 2014 with
the hauling operation and the anticipated growth in background traffic volume over
the next ten years.
4 Ibid.
5 Environmental Assessment Worksheet, "Vesterra, LLC, Sand and Gravel Mine "City of Rose-
mount, Minnesota, by WSB & Associates, Inc., March 25, 2003.
T10 1 1 9 1 -24 \Traffic Study\MEMORANDUM -- Stonex, LLC Saod & Gravel Mine.doc
Memorandum to File
July M, 2004
Page 10
Table IN CSAH 71 (Blaine Avenue) 6 -Hour Truck Count
Location: North of Co. Rd. 38 Intersection
Dates: AM, June 23, 2004; PM, June 15, 2004
Time, AlV1
�. Northbound ";
Southbound
Time, PM
; .Northtiound
Southbound
Six-axle dump
Three -axle dump
6:00 -6:15
Five -axle tank
3 :00 -3:15
Seven -axle dump
Six -axle dum
Total
_
Totah 1
Six -axle dump
6:15 -6:30
Five -axle tank
Two -axle tank
3:15 -3:30
Three -axle tank
Three -axle dump
Six -axle dum
1 Total:
TotaE 3 -= . ......
`total; 1
Two -axle stake
Six -axle dump
Five -axle tank
Three -axle trash
Two -axle FED X
6:30 -6:45
Three -axle dump
3:30 -3:45
Five -axle dump
Three -axle trash
Six-axle dum
Total: 2 ! :: ".
Total 1 '`
Total: 6.:" ..'.
; Total: 0
Six-axle dump
Three -axle trash
Two -axle trash
Five -axle tank
Five -axle tank
Six -axle dump
6:45 -7:00
Five -axle tank
3:45 -4:00
Two -axle dump
Six-axle dum
5 ...... ......::
.Tot$h, l .
Seven -axle dump
Five -axle grain
Five -axle tank
Six-axle dump
S
Six -axle dump
7:00 -7:15
Five -axle tank
4:00 -4:15
Four -axle trash
Six-axle dum
Total
Total. Q
TotaC .5 =
Total: 1
Four -axle dump
Four -axle dump
Six -axle dump
Six-axle dump
7:15 -7:30
Two -axle contractor
Six -axle dum p
Six -axle dump
Two -axle state
4:15 -4:30
Seven -axle dump
Two -axle state
Total. S .=
Total: 2 , , :' "
Total 3. ,"
Totals 0"
Two -axle delivery
Five -axle tank
Three -axle dump
Six-axle dump
Six -axle dump
Five -axle grain
7:30 -7:45
Five -axle tank
Four -axle dump
4:30 -4:45
Five -axle tank
Two -axle FED X
Six -axle dum
Total. 2 .':
Tatal.2 .
Totsk 2
Three -axle trash
Three -axle dump
Six -axle dump
Five -axle tank
Four -axle dump
Seven -axle dump
7:45 -8:00
Three -axle trash
Four -axle dump
4:45 -5:00
Two -axle UPS
Three -axle dump
Two -axle delivery
Five -axle dump
Two -axle dump
Two -axle dum
Total: 1
Total: 5
Total. 7
Total: i
(Cont.)
T: \01191 -24 \Traffic Study\MEMORANDUM -- Stonex, LLC Sand & Gravel Mine.doc
Memorandum to File
July a 2004
Page 11
(Continued from Table jj CSAH 71 (Blaine Avenue) 6 -Hour Truck Count
previous page.) Location: North of Co. Rd. 38 Intersection
Dates: AM, June 23, 2004; PM, June 15, 2004
1'me� AM
Noirtlitbound'
Southbound
of
SouthbQUnd
8:00 -8:15
Two -axle trash
Six-axle dump
Six-axle dump
Three -axle dump
5:00 -5:15
Two -axle trash
Three -axle dum
Total 5 ...
Total 1 ...
Total Q
`Totat 0 ...." .
Three -axle dump
Two -axle trash
Five -axle tank
Six -axle belly
dump
8:15 -8:30
Four -axle dump
Two -axle trash
5:15- 5:30
Five -axle tank
Five -axle tank
Total. Z... i
Total. 2
Total 2
Total. 2
Six-axle dump
Six -axle dump
Four -axle dump
Six -axle dump
8:30 -8:45
Five -axle tank
Two -axle school bus
5:30 -5:45
Three -axle dump _
Five -axle tank
Four -axle dump
Five -axle dum
Total. _ �=
- Total.
Total: 1 _ :
Four -axle dump
Two -axle school bus
Four -axle dump
Four -axle dump
8:45 -9:00
Two -axle dump &
Five -axle dump
- 5:45 -6:00
Six -axle dump
Two -axle dump
trailer
Three -axle dump
Four -axle dump
T:\0 1 1 9 1- 241Traffic Study\N4EMORANDUM -- Stonex, LLC Sand & Gravel Mine.doc
Memorandum to File
July ■, 2004
Page 12
Table J. CSAH 71 (Blaine Avenue) PM 3 -Hour Truck Count
Location: Between 138 Street (Private Entrance) and Co. Rd. 38 Intersections
Date: June 16, 2004
Time, PM
Northbound„ _.
Sauthiiono
Six-axle dump
Five -axle tank
3:00 -3:15
Six -axle LUM
Tot
;Total; 1
Three -axle Excel Energy
Four -axle trash
Six -axle dump
3:15 -3 :30
Three -axle trash
Six -axle dump
Three -axle semi- trailer
Three -axle propane
Total: '� a
Total';, p
Three -axle water
3:30 -3:45
Six -axle dump
Six -axle dum
Tota1._ .- :
TotaH 0 h
Six -axle dump
Three -axle dump
Two -axle Dart bus
Three -axle dump
Six-axle ready mix
3:45 -4:00
Six -axle dump
Three -axle trash
Six -axle dum
T bta h?5
Total's
Six -axle dump
Three -axle trash
4:00 -4:15
Six -axle dump
Three -axle Vic's crane
Six-axle dump
Six -axle dump
Two -axle delivery
4:15 -4:30
Five -axle tank
Two -axle delivery
Six-axle dum
Total: 4; .
Total'• 2 ...., . "
Six -axle dump
Three -axle tank
4:30 -4:45
Two -axle flat bed
�Totial; 3`. .. „ ..
Totals 1T . , .
Six-axle dump
4:45 -5:00
Six-axle dum
Six -axle dump
Six -axle dump
Three -axle semi - trailer
5:00 -5 :15
Six -axle dump
Three -axle dum
Total; 4 „'
;Total': i ,
Three -axle dump
Three -axle semi - trailer
5:15- 5:30
Six-axle dump
Six-axle dump
Six-axle dum
Tatai: 3'
Total- 2
Six-axle dump
Four -axle water tank
Two -axle work truck
Six-axle dump
Six -axle dump
5:30 -5:45
Three -axle dump
Five -axle tank
Six -axle dum
Total; 5 =_
Total: 3
Three -axle dump
Six -axle dump
5:45 -6:00
Five -axle tank
Six -axle dump
Six-axle dum p
59 Trucks' and Busses
T:\01191 -24 \Traffic Study\MEMORANDUM -- Stonex, LLC Sand & Gravel Mine.doc
Memorandum to File
July ®, 2004
Page 13
Table 1. CSAH 71 (Blaine Avenue) 6 -Hour Truck Count*
Location: North of CSAH 42 (145 Street)
Date: June 17, 2004
6:0_0 -6:15
0
0
3:00 -3:15
4
2
6:15 -6:30
0
0
3:15 -3:30
8
0
6:30 -6:45
4
0
3:30 -3:45
5
.0
6:45 -7:00
1
0
3:45 -4:00
6
4
7:00 -7:15
3
1
4:00 -4:15
2
0
7:15 -7:30
2
0
4:154:30
7
0
7:30 -7:45
3
1
4:304:45
3
2
7:45 -8:00
4
0
4:45 -5:00
6
1
8:00 -8:15
1
1
5:00 -5:15
5
1
8:15 -8:30
4
2
5:15 -5:30
5
1
8:30 -8:45
4
1
5:30 -5:45
3
2
8:45 -9:00
6
1
5:45 -6:00
8
0
*Traffic volume, speeds, and intersection configuration at this location precluded the
gathering of vehicle type information such as that provided in Tables I and in this
memorandum.
T:\01191 -24 \Traffic Study\MEMORANDUM -- Stonex, LLC Sand & Gravel Mine.doc