HomeMy WebLinkAboutVARIANCE Nonconforming Use 1895 Big Thompson Ave 2014-09-11Administ
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TOWN OF EST I-2S P
September 11, 2014
Jim Fletemeyer
101 2nd Avenue
Niwot, CO 80544-0036
RE: Sombrero Stables `stockpile' — Approval of variance to allow change
ar to non -conforming use
Dear Mr. Fletemeyer:
The Estes Valley Board of Adjustment reviewed the subject variance request
during their regularly scheduled meeting Tuesday, September 9, 2014. At that
time, the Board of Adjustment voted unanimous CONDITIONAL APPROVAL (3-
0, two absent). The conditions of approval are:
1. Materials stored on Sombrero Ranches shall be used only on the Sombrero
Ranch site and other livery operations controlled by Sombrero Ranch for
repairs and normal maintenance of the existing trails and roads. Approval of
this variance does not provide approval for expansion of the existing trail and/or
road system.
2. The stockpiled material and access road shall be restored in accordance with
EVDC Section 7.2.0 Restoration of Disturbed Areas no later than May 31 2015.
3. A development agreement and form of credit to ensure site restoration shall be
submitted for review and approval prior to any site work.
4. The modification of the access off of Dry Gulch Road shall require an Access
Permit from the Larimer County Engineering Department. The issuance of the
access permit shall include improving the access to meet the County access
requirements and shall also include the requirement to reclaim the access to
the pre -construction condition.
5. A detailed construction plan shall be submitted for review and approval by the
Larimer County Engineering Department. The plan shall detail the proposed
access road on the site to the location where the materials will be deposited.
The temporary access road shall be built to minimize disturbance and the
potential for erosion. The plan shall also address screening, as required by
EVDC Section 7.13 Outdoor Storage Areas, Activities and Mechanical
Equipment.
6, A State Construction Activity Permit is required prior to commencement of the
hauling operation. The detailed stormwater management plan required with the
State permit shall also be submitted to the Larimer County Engineering
Department and the Town of Estes Park Planning Department for review and
approval.
170 MACGREGOR AVE.
P.U. SOX 1200
LS"I'ES PARK. CO ftO,17 nu gpn_cvr__co-�
September 11 2014
Page 2 of 2
7. A traffic control plan shall be submitted to, and approved by, the Larimer
County Engineering Department prior to commencing the hauling
operations. This shall include management of traffic on McGraw Ranch Road.
8. A haul plan shall be submitted for review and approval by the Larimer County
Engineering Department. The plan shall describe procedures for maintaining
a safe and functional road for the residents during the hauling operations. For
example, dust suppression may be needed, pull outs for passing, the
requirement for only 1 truck at one time on the road, where equipment stored
overnight and during weekends, vehicle tracking pad, etc.
9. All other necessary State permits shall be issued prior to the commencement
of the hauling operations.
10. The owner of the originating site shall maintain McGraw Ranch Road
during the hauling, and shall repair the road upon completion of the hauling.
Next Steps. Please contact Clint Jones in the Larimer County Engineering
Department to discuss submittal requirements for the construction plans and any
other county approvals necessary. You can reach Clint at 498-5727.
Revision. Revisions to Board of Adjustment approval may be processed by staff
as long the revisions reduce the overall site impact. For example, using existing
roads instead of a new road or reducing the size of the stockpile. Should you wish
to explore this option, please contact staff with a written description of the request,
including a site plan and operational timeframes.
Board of Adjustment Minutes. Board of Adjustment meeting minutes will be
posted at www.egps.gig approximately one month following the meeting. Minutes
will state whether the variance was approved or denied and will list any conditions
of approval. Staff recommends the property owner keep a copy of the minutes for
their records.
Null and Void. If the Estes Valley Board of Adjustment approves the variance,
the property owner must apply for a building permit and commence construction
or action with regard to the variance approval within one year of the approval. If
this does not occur, the variance automatically becomes null and void.
Should you have any questions or comments regarding this matter, please feel
free to contact me at 577-3729 at your convenience.
Respectfully,
77)90 (1,61: vd W. Shirk, AICP
Senior Planner
cc: Cody Rex Walker, applicant (via email)
LAR.imtR
couNlY
1895 Big Thompson Avenue
Setback Variance
Estes Park Community Development Department, Planning Division
Room 230, Town Hall, 170 MacGregor Avenue
PO Box 1200, Estes Park, CO 80517
Phone: 970-577-3721 Fax: 970-586-0249 www.estes.org
ESTES VALLEY BOARD OF ADJUSTMENT
MEETING DATE: September 9, 2014
REQUEST: This is a request to Estes Valley Development Code (EVDC) Section
6.3.C.1 Alteration/Extension of Nonconforming Uses Prohibited. The purpose of the
variance to expand a non -conforming use to allow outdoor storage of fill materials for
use on -site.
The request is to store materials on the Sombrero Ranch property to maintain existing
trails and roads. The application notes the stockpile would be redistributed over the
course of 10-12 years.
The materials are from the dredging of an existing pond located at 2153 McGraw Ranch
Road.
The stockpile would cover 2-acres of land approximately 6-feet deep. The stockpile would
be located approximately 700-feet east of and 100 vertical feet above the Stonegate
The Engineering Department also submitted a list of recommended conditions to address
hauling operations. These are included as recommended conditions of approval.
Public Comments. This request has generated several comments from nearby
residents; these are attached. Concerns include: impact on traffic, impact on roads,
impact on wildlife, visual impact, and erosion control.
STAFF FINDINGS:
1. Special circumstances or conditions exist (e.g., exceptional topographic conditions,
narrowness, shallowness or the shape of the property) that are not common to other
areas or buildings similarly situated and practical difficulty may result from strict
compliance with this Code's standards, provided that the requested variance will not
have the effect of nullifying or impairing the intent and purposes of either the specific
standards, this Code or the Comprehensive Plan.
Staff Finding: The Sombrero Ranch consists of 288 acres. The stable operations
are located at the corner of Big Thompson Avenue and Dry Gulch Road, and are
zoned for commercial use (CO Commercial Outlying).
The majority of the property, including the proposed storage area, is zoned for
residential use (RE-1 Rural Estate). This area includes the horse trails and hay
storage area. This renders the property non -conforming in terms of the development
code, therefore necessitating the variance request to expand the commercial use of
the property.
Section 6.1.C.1 of the development code states that "a non -conforming use shall not
be altered or extended."
If located on the commercially zoned portion of the property, the proposed outdoor
storage would be a use -by -right, and would have to comply with screening
requirements outlined in Section 7.13 of the development code.
2. In determining "practical difficulty," the BOA shall consider the following factors:
a. Whether there can be any beneficial use of the property without the variance;
Staff Finding: The existing commercial use may continue. Section 6.3.B allows
for repair and normal maintenance to keep a nonconforming use is a safe condition
shall be permitted. The proposed stockpiling of material is intended to provide for
long-term maintenance of the property.
b. Whether the variance is substantial;
Staff Finding: The variance is substantial in that it would allow a two -acre area
with several feet of fill materials to be stockpiled for the next 10-12 year. The
1895 Big Thompson Avenue Page 3 of 7
Expansion of Non -conforming Use Variance
Visual Impact. The proposed storage site would be located behind mature trees
(as viewed from Dry Gulch Road), approximately 100-vertical feet above Dry Gulch
Road, and approximately 50-60 vertical feet above Stone Gate Drive. The site
would be located approximately 700-feet east of Dry Gulch Road, with several
hundred feet of vegetative buffer between the stockpile and road.
Because of the long-term nature of the use, the storage pile should be vegetated
with native grasses to mitigate visual impact, discourage invasive weeds, and
prevent windblow and stormwater erosion.
The temporary access should be reclaimed with native grasses after the hauling
operations cease.
Rof
Ative
. 10
MOW
417(6,,eA
View from Dry Gulch Road up hill to proposed stockpile location (not visible
through trees)
Truck Traffic. The proposed use would generate approximately 1,500 truck trips
over the course of several weeks. Once the hauling operations ceased and the
access road reclaimed, the overall impact on the neighborhood would be minimal.
1895 Big Thompson Avenue
Expansion of Non -conforming Use Variance
Page 5 of 7
The variance request to deposit the materials on the Sombrero Ranch provides an
opportunity to impose operational requirements on the overall dredging process;
without the variance, there would be no opportunity for county engineering review of
the dredging and hauling operations.
STAFF RECOMMENDATION: Staff recommends APPROVAL of the requested
variance CONDITIONAL TO:
1. Materials stored on Sombrero Ranches shall be used only on the Sombrero Ranch
site for repairs and normal maintenance of the existing trails and roads. Approval of
this variance does not provide approval for expansion of the existing trail and/or road
system.
2. The stockpiled material and access road shall be restored in accordance with EVDC
Section 7.2.0 Restoration of Disturbed Areas no later than May 31 2015.
3. A development agreement and form of credit to ensure site restoration shall be
submitted for review and approval prior to any site work.
4. The modification of the access off of Dry Gulch Road shall require an Access Permit
from the Larimer County Engineering Department. The issuance of the access permit
shall include improving the access to meet the County access requirements and shall
also include the requirement to reclaim the access to the pre -construction condition.
5. A detailed construction plan shall be submitted for review and approval by the Larimer
County Engineering Department. The plan shall detail the proposed access road on
the site to the location where the materials will be deposited. The temporary access
road shall be built to minimize disturbance and the potential for erosion. The plan shall
also address screening, as required by EVDC Section 7.13 Outdoor Storage Areas,
Activities and Mechanical Equipment.
6. A State Construction Activity Permit is required prior to commencement of the hauling
operation. The detailed stormwater management plan required with the State permit
shall also be submitted to the Larimer County Engineering Department and the Town
of Estes Park Planning Department for review and approval.
7. A traffic control plan shall be submitted to, and approved by, the Larimer County
Engineering Department prior to commencing the hauling operations.
8. A haul plan shall be submitted for review and approval by the Larimer County
Engineering Department. The plan shall describe procedures for maintaining a safe
and functional road for the residents during the hauling operations. For example, dust
suppression may be needed, pull outs for passing, the requirement for only 1 truck at
one time on the road, where equipment stored overnight and during weekends, vehicle
tracking pad, etc.
9. All other necessary State permits shall be issued prior to the commencement of the
hauling operations.
SUGGESTED MOTIONS
I move to APPROVE the requested variance with the findings and conditions recommended by
staff.
I move to DENY the requested variance with the following findings (state reason/findings).
1895 Big Thompson Avenue Page 7 of 7
Expansion of Non -conforming Use Variance
ESTES VALLEY BOARD OF ADJUSTMENT
REQUEST FOR VARIANCE STATEMENT OF INTENT
Parcel 2520000003 Sombrero Ranch Inc
1895 Big Thompson Avenue
Estes Park, Colorado 80517
This application is for a variance to grant Sombrero Ranch permission to locate a stockpile of imported silt
and gravel (from a nearby flood debris site) to re- surface and stabilize horse trails and stable area
operations at its Estes Park facility. A neighboring ranch (within 5 driving miles) has an immediate need
to relocate this material (-20,000 cu. yds. from an infilled private lake), which can now be transported this
fall, given less traffic in the area. With Sombrero's RE-1 Rural Estate zoning, the size and placement
requirements of this material, become an issue necessitating a variance. The size of the pile to be
located on Sombrero Ranch property (to be redistributed over the next 10 to 12 years) would require two
(2) acres, stockpiled six (6) feet high to contain —18,000 cu. yds. (-2000 yds. is to be used at the Moraine
Stables in Rocky Mountain National Park.) The nature of this project exceeds the minimum allowable
footprint for development, given the duration of the stockpile.
The reason for the variance is to facilitate two distinct needs. ONE — reclamation export of flood debris
from a 2.5-acre inundated lake (located 3 miles north of the town limits) to a site that, TWO — needs to
establish a long term, on -site source of granular material to mitigate dust, mud, soil erosion and soil
migration conditions, associated with operating a commercial horse stable with riding trails.
Review Standards
1. Special existing circumstances or conditions exist: The proposed debris stockpile site (at the
north end of the Sombrero Ranch property) is conveniently accessed off Dry Gulch Road
through an existing site entry gate. This approach does not interfere with any side road
drainage; the Fringe Flood Area along Dry Gulch is mapped some 1500 feet south of this
access point (see attached map).
The proposed debris stockpile site is hidden from view. An approximate 70' rise in
topography occurs approximately 480 feet east of Dry Gulch Road, behind which the debris
stockpile will be located. This ridge and the natural forestry on the parcel hide the stockpile
site from common view from Dry Gulch Road and the property to the north.
2. Practical Difficulty
a. The current use of the subject property area is undeveloped sloping meadow. The
property has been in use without the variance, but the owners would like the
opportunity to improve the overall quality of their property by recycling locally
available materials to stabilize migrating horse traffic soils.
b. The variance could be considered substantial given the life of the project, however
the lasting impact on the site and immediate impact on surrounding properties is not
substantial. The site will be returned to its original meadow -like condition after
depletion of stockpile materials and the soils will be preserved due to the debris
stockpile halting the migration and erosion patterns.
c. The essential character of the neighborhood and/or adjacent properties will not be
altered or negatively impacted visually or operationally by this debris stockpile
location. See the site proximity map attached.
d. The variance will have no effect on public utilities. Neither are there utilities within the
proposed stockpile area or access circulation.
e. Without a variance, both sites (the originating and receiving, Sombrero Ranch) will
suffer from losing this unique opportunity to restore a natural lake (at the originating
site) and establishing a natural 10+ -year silt and gravel stockpile to help stabilize
disturbed site soils. If these operations are conducted independent of each other, the
cost/benefit analysis is no longer feasible for either project.
3. The conditions reflected in the application are not general. They are specific to this particular
strategy, property size and stockpile configuration per the proposed manner of installation
and per the existing grading conditions. The manner of installation is a bulldozer which will
push the dumped material into a pile approximately six (6) feet high. The existing grading
condition is a consistent downhill slope at 5-8%. The edge of the stockpile will be lined with a
three (3) foot high silt fence.
4. No reduction in the lot size or increase in the number of lots is proposed by this variance
request.
5. The plan proposed is not excessive: the original desire was to augment the site soils with
granular material from conventional suppliers, but the logistics of standard deliveries does not
integrate well with Sombrero Ranch's program dynamics, given fluctuating trail rides and
varying maintenance needs. The addition of the large debris stockpile enables the owner to
make multiple transports internally as well as externally, depending on individual site
locations, whenever a need arises. Furthermore, the designated clearing is ideal in size and
location for receiving, storing and distributing a sustainable, free draining and otherwise
unattainable resource like this, due to the secluded nature of the site, as further indicated by
the photos and maps included with the application.
6. The variance does not propose a non -permitted or prohibited use.
Prepared by: Jim Fletemeyer, ASLA
Fletemeyer & Lee Associates, Inc.
I I I II. I
110
September 16, 2014
David W. Shirk, AICP
Planner II
Town of Estes Park (Community Development Department)
170 MacGregor Av.
Estes Park, CO 80517
Dave,
Please review the following statements as part of a request to modify the approved
variance strategy, which will limit the impact in accessing the Sombrero Ranch dump site
from Dry Gulch Road. This new site entry relocation would lessen concerns raised at the
hearing and in previous notifications,
1. A former access road (3400' south of the NW corner), entering the Sombrero property
off Dry Gulch Road, washed out by the last year's flood, has been reconstructed over
the last month. This reopened access will allow an alternative drive to the dump site
inside the property. By utilizing this roadway, the project will no longer require
construction of the NW entry and its access road over land to the approved dump site.
2. The reopened road can be used without additional road construction or a VTC tracking
pad, as it was formally constructed with recycled asphalt, as a fully restored roadway
with upsized culverts.
3. Utilizing this revised access location does not require an access permit, because it
represents an existing curb cut (which can be verified).
4. The original/approved dump site would still be used, but tree removal created when
accessing the dump site would be eliminated, and the road extension re -vegetation
would not be required. This will also eliminate truck visibility and noise distractions
to the Stone Gate neighborhood and will not disturb the evergreen forest, buffering
the dump site.
5. The completed set of implementation documents — i.e. the project implementation
plan, the hauling plan and the traffic plan would each refer to this revised condition,
subject to final approval.
Additionally, 18 yard side dump tractor trailers will no longer be used, because of the passing lane
requirement and safety logistics with tight turning radii's. Instead, tandem 15 yard dump trucks will be
used, which can pass each other without pullouts, similar to cars in opposite directions. (FYI - Tandems
were originally understood to be used, as mentioned by the Road Association.) There is one significant
pullout within the Sombrero routing scheme at the intersection H Bar G Road and Dry Gulch Road that
would be used for a pullout (see attached drawing).
We hope these changes in strategy are viewed as positive revisions to the project and can be given your
initial approval to complete our plans, subject to actual submittal.
Please let me know your verdict, as soon as possible, to move us closer to project commencement.
Thanks, Dave.
FLETEMEYER & LEE ASSOCIATES, INC.
James K. Fletemeyer, ASLA
President
Conditions No. 1, 2, 5, & 10
The Sombrero Ranch (SR) Hauling Operation Implementation Plan for Stockpiling Flood Debris
Materials [from Lost Antler Ranch (LAR)] to the NW corner of the Sombrero Ranch (SR) property
This Project Implementation Plan is broken into the following phases:
1. Formulation of the hauling route for excavating, loading, hauling and depositing flood debris in
the Estes Valley, per a variance approval by the Board of Adjustments
A routing plan has been created to indicate the circulation pattern for hauling operations - see
attachment. The hauling route was chosen for its close proximity to LAR for removing lake debris to
an alternative site in the shortest amount of time possible, estimated at 8 to 10 weeks, weather
permitting.
2. Point of Origination — Loading
The LAR excavation site occurs at the west end of the LAR Lake, which is at the north and east end of
the McGraw Ranch Road. A track hoe loading area would be formed just beyond the entry into LAR,
adjacent to the lake's debris accumulation, over two acres in size, 6 feet deep. A track loader will
constantly push the 6 feet of coarse sand/silt and gravel material towards the loading platform for
the track hoe to load a recirculating line of 15 yard tandem trucks, hauling the alluvial material to
the Sombrero Ranch property, 6.5 miles from the load site to the dump site. The actual number of
tandems used will depend on the best flow of traffic — i.e. round trip truck circulation, interfacing
with local traffic conditions. The hauling is to be performed 12 hours a day, 5 days a week, until the
debris accumulation, estimated at 18-20,000 cubic yards, can be successfully removed from the
property. Tandems will use a hammerhead turnaround near the loading platform to reorient the
trucks, driving back out. As many as two trucks can be waiting behind the loading truck in this area
at a given time. Trucks loads are covered before they leave the LAR property. Equipment will be
stored overnight at the LAR loading site (and near the SR dump site).
3. Pre -Plan Implementation `Walk Through'
A full time Field Administrator (FA), assigned to monitor operations on a daily basis, will instigate a
meeting, involving interested parties, to walk through the intended project operation plan. The
pace of the project will begin slow and gradually increase to an expedient, yet well -controlled level.
The FA's contact information will be available to representative parties along the hauling route (as
well as local officials), as the intent is to be accessible throughout the project's duration. The
existing conditions of McGraw Ranch Road are to be videotaped and impacts will be recorded,
subject to remediation, as circumstances arise.
4. McGraw Ranch Road Maintenance and Quality Control
Periodic road grading, trouble shooting and dust control will be conducted throughout the
implementation process. A motor grader and a water truck will be on site at critical times to level
and dampen the road surface, as needed. The road will also be monitored for shoulder swale
integrity, driveway accessibility and stability, haul spillage and spring water encounters. This
monitoring will be provided by the FA, photographed, logged and addressed.
5. Monitoring the Traffic Control Plan and the Hauling Plan
The FA will be responsible for monitoring all operations, including collection of daily trip information
and verifying that quality standards are being maintained. If additional signage is deemed necessary,
the FA will collaborate with the traffic control consultant for further considerations. Likewise, the
FA may request alterations to the hauling plan to improve procedures, safety precautions and
environmental concerns. The FA monitors the routing loop on a continual basis throughout the day
and logs concerns for on -going discussion with the haul contractor and his operators. The FA is tied
into the haul operators' communication system in addition to maintaining contact information with
designated community representatives and emergency response procedures.
6. Hauling Operations — Quality Control
Refer to the Hauling Plan in combination with the Traffic Control Plan. Note: Drivers and equipment
operators will have been instructed to yield to local motorists, paying particular attention to road
widths for passage, intersections, driveways, parked vehicles, pedestrians, and weather conditions.
Cones will be used to identify potential road constrictions and damaged areas to be repaired upon
short notice.
7. Point of Deposit
The dump site on the SR property is designed to rout trucks clockwise (or counterclockwise) where
trucks stop and back up in a stable position into the center of the dump circle before elevating and
depositing their loads. A track loader is positioned on the site to continually consolidate the pile.
The pile will be shaped at a 4:1 slope at the outside edge of the circle rising to 5' in elevation above
existing grades and then will rise to a center elevation of +8'. A water truck will also be used at this
site during operations to control dust. A haul road will loop around the debris stockpile for deposit
circulation and future access. Upon completion, the dump stockpile will be seeded with native
meadow grasses, according to the revegetation plan under site restoration.
8. Road and Deposit Site Restoration
Per Condition #10, McGraw Ranch Road will be restored to its existing condition at the conclusion of
the hauling project. The Field Administrator will photo document the existing conditions along the
roadway prior to commencing the project. Road restoration includes but is not necessarily limited
to restoration of ditches at the sides of the roads, restoring the road to existing widths, removal of
debris along the road that may be produced as a byproduct of hauling activities, repair and
restoration of the road surface including additional material as needed with proper crown and
banking of turns, repair and restoration of any off road damage relating to the hauling project
(fences, signs, etc.), repair at connecting driveways and side road intersections if impacted by
hauling, repair and/or replacement of any cross -road culverts or existing drainage systems damaged
during hauling along the roadway.
9. Restoring the Deposit Site at Sombrero Ranch
The ultimate goal in treating the stockpile at SR is to keep bare soil to a minimum to prevent wind
scourer and water erosion and to prevent weedy species from getting started. To accomplish this
goal long term, vegetation of the pile will be necessary. When the stockpile has been completed, it
will be reseeded with a native grass/forb mix including one non-native, annual rye to establish a
ground cover.
The seeding operation will include the following steps:
• The pile would be fertilized with diammonium phosphate 18-46-0 at 250 Ibs/acre, because it is
notoriously deficient in Colorado soils but is very beneficial to new seeding, because it promotes
root growth.
• The fertilizer will be worked into the top 6-8 inches of soil with a chisel plow or disc, while
preparing the seedbed.
• Seed will then be drilled with a grass/forb mix (TBD).
• Hydromulch, using wood fiber at 2500 Ibs/acre with a heavy tackifier for initial soil stabilization,
will then be applied over the seeded area.
As the stockpile is utilized, care will be taken to restore the original grade. Large bare soil areas
created by material removal, can be reseeded with the above steps. Small incursions into the pile
could be hand seeded with an appropriate seed mix or very small areas could be covered with horse
manure from the stable operation.
10. Stockpile Visibility from Dry Gulch Road in accordance with EDVC Section 7.13
The attached aerial photograph (site plan) indicates where three accompanying photographs were
taken from at locations west of Dry Gulch Road by a local engineering crew (Van Horn Eng. on
9/11/14). The ground photographer moved throughout the neighborhood until he could see the
other surveyor (a 6 foot tall rodman; use zoom) from three different angles from which the debris
stockpile might be seen. The rodman stood at the edge of pile outline (which would measure 5 feet
high at any of those locations) atop the hillside, 1000 feet away from the photographer.
Without superimposing the pile within the forest electronically, the pile appears to be 95% obscured
by the evergreen forest. The photos imply only two minor visibility gaps that occur — the first in
Photo #1, approximately 30 feet wide (at distance) and the second in Photo #3, approximately 15
feet wide (at distance). Given that the seeded area hydromulch will be tinted green upon
completion and will be quickly replaced by annual rye grass, the need to screen to 100% should be
unnecessary.
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STORM WATER MANAGEMENT PLAN
1. Site Description
Additional information for permitted projects. For information only to fulfill the CDPS-
SCP (Colorado Discharge Permit — Stormwater Construction Permit)
A. Project site description: The Sombrero Stables project consists of stockpiling fill
material within property boundaries to be used onsite for trail construction and
maintenance. The total volume of the proposed stockpile is 20,000 CY in a 1.75
acre area. Access to the stockpile site will be along an existing road surfaced with
recycled asphalt.
B. Proposed Sequencing For Major Activities: No construction activities for this project
are proposed. The BMP's around the stockpile site and along the access road shall
be installed prior to fill being placed onsite.
C. Acres Of Disturbance: Includes clearing, grading, excavation, stockpiling of fill
materials, demolition, areas with heavy equipment/vehicle traffic that will disturb
existing vegetative cover.
Total area of construction site: 1.75 acre
Total area of disturbance: 2 acres
Acreage of seeding: 2 acres
D. Existing Soil Data: Type B, Gravel, decomposed granite under topsoil, some areas
of fractured granite and bedrock.
E. Existing Vegetation. Including Percent Cover: Ponderosa Pine forest and disturbed
upland montane grassland, 70%-90% vegetative cover.
Date of survey: August 28, 2014.
F. Potential Pollutants Sources: There are no obvious on -site potential pollution
sources.
G. Receiving Water:
1. Outfall locations: an upland swale along the east side of the stockpile site, the
remainder is sheet flow across upland habitat
2. Names of receiving water(s) on site and the ultimate receiving water: Dry Gulch
is located approximately 600' west of the stockpile site and along the south
portion of the access road. The ultimate receiving water is the Big Thompson
River
3. Distance ultimate receiving water is from project: Big Thompson River - One
mile downslope (across varying topography and arterial roads)
4. Does the receiving water have an approved TMDL: no
H. Allowable Non-Stormwater Discharges: [n/a]
1. Groundwater and stormwater dewatering: Discharge to the ground of water from
construction dewatering activities may be authorized provided that:
a. The source is groundwater and/or groundwater combined with stormwater
that does not contain pollutants.
b. The source and BMP's are identified in the SWMP.
c. Discharges do not leave the site as surface runoff or to surface waters.
2. If discharges do not meet the above criteria a separate permit from the
Department of Health will be required. Contaminated groundwater requiring
coverage under a separate permit may include groundwater contaminated with
pollutants from a landfill, mining activities, industrial pollutant plumes, underground
storage tank, etc.
1
I. Environmental lmpacts:
1. Wetland Impacts: yes no
2. Stream Impacts: yes no
3. Threatened and Endangered Species: none identified
2. Site Map Components
Pre -construction
A. Construction Site Boundaries: 1.75 acres -includes all private land (refer to site
map).
B. All Areas Of Ground Surface Disturbance: Along access road and stockpile
location.
C. Areas of cut and fill: None.
D. Location Of All Structural BMP's Identified In The SWMP: Silt Fence along
portions of the access road (adjacent to wetland and Dry Gulch).
E. Location Of Non -Structural BMP's As Applicable In The SWMP: Soil
roughening, seeding, mulch and mulch tackifier will be applied to stockpile and
any disturbed soils.
F. Springs. Stream, Wetlands and Other Surface Water: Neither wetland habitat
nor surface water exist within stockpile site.
G. Protection Of Trees, Shrubs. Cultural Resources And Mature Veaetation: Silt
fence is required as shown on the Site Plan as protection of trees, shrubs, and
mature vegetation. No cultural resources have been identified within the
proximity of the construction boundary.
3. SWMP Administrator For Design: Celine LeBeau and Lonnie Sheldon, Van Horn
Engineering and Surveying, Inc.
4. Stormwater Management Controls First Construction Activities
The Contractor Shall Perform The Following:
A. Designate A SWMP Administrator/Erosion Control Supervisor: Designate the
individual(s) responsible for implementing, maintaining and revising SWMP,
including the title and contact information. The activities and responsibilities of the
administrator shall address all aspects of the projects SWMP. A SWMP notebook
must be create, kept on site and updated regularly (i.e., inspections, BMP
installation details and changes, photographs, etc.).
B. Potential Pollutant Sources:
Evaluate, identify and describe all potential sources of pollutants at the site in
accordance with subsection 107.25 and place in the SWMP notebook. All BMP's
related to potential pollutants shall be shown on the SWMP site map by the
contractor's ECS.
C. Best Management Practices (BMP's) For Stormwater Pollution Prevention
Phased BMP Implementation
During construction the ECS shall update the SWMP inspection log to document
maintenance, condition, and revisions of BMPs.
2
Non -Structural BMP practices for pollutants, erosion and sediment control:
The ECS should coordinate with the contractors to educate them on the impacts of their
actions on the environment. They should be conscientious in their work to produce
minimal possibilities of stormwater contamination. Examples would be street sweeping at
the end of day, proper material handling practices, regular fleet maintenance, spill
prevention, and essentially a clean site will produce less stormwater contamination.
BMP
Type Of
Control
BMP As
Designed
In
Use
On
Site
First
Construction
Activities
During
Construction
Interim/Final
Stabilization
Surface
Roughening/Grading
Techniques (stockpile)
Erosion
Soil Binder/Mulch
Tackifier (road and
stockpile)
Erosion
Seeding Permanent w/
Mulch (stockpile and
disturbed soils along
road)
Erosion
Other
Structural BMP practices for erosion and sediment control:
The scope of the project does not entail large areas of land to be disturbed, essentially a
1.75-acre stockpile site with some disturbance to an existing dirt road due to increased truck
traffic. Erosion control measures are to remain in place until long term BMP's are installed
and suitable revegetation has been achieved.
BMP
TYPE OF
CONTROL
BMP as
Designed
In
use
on
site
FIRST
CONSTRUCTION
ACTIVITIES
DURING
CONSTRUCTION
INTERIM/FINAL
STABILIZATION
Silt Fence
1,150 around stockpile
And along portions of
access road adjacent to
wetland/Dry Gulch
Sediment
• Erosion control devices are used to limit the Erosion control devices are
used to limit the amount of erosion on site.
• Sediment control devices are designed to capture sediment on the project
site.
• Construction control are BMP's related to construction access and staging.
• BMP installation details and general narratives are in the SWMP log book.
D. Offsite Drainage (Run On Water)
1. Not applicable.
E. Stabilized Construction EntranceNehicle Tracking Control
1. Existing, permanent fence exists up to either side of access road entrance,
which is also gated. The access road is surfaced with recycled asphalt,
therefore a tracking pad is not necessary. The access road entrance is
considered stabilized.
3
F. Perimeter Control
1. Perimeter control shall be established prior to construction activities to
prevent the potential for pollutants leaving the construction site boundaries,
entering the stormwater drainage system, or discharging to state waters.
The staging area shall be the first site to be established.
2. Perimeter control may consist of silt fence, erosion logs, existing landforms,
or other BMP's as approved.
3. Perimeter control shall be in accordance with
subsection 208.04.
5. Durina Construction
Responsibilities of the SWMP administrator/erosion control supervisor during construction.
The SWMP should be considered a living document" that is continuously reviewed and
modified. During construction, the following items shall be added, updated, or amended as
needed by the SWMP Administrator/Erosion Control Supervisor (ECS) in accordance with
section 208.
A. Materials Handling And Spill Prevention
B. Stockpile Management
C. Grading And Slope Stabilization
D. Surface Roughening
E. Vehicle Tracking
F. Temporary Stabilization
G. Street Cleaning
H. Maintenance and repair of stormwater
management controls
6. Inspections
A. Inspections
a. Minimum: every 14-days and within 24 hours after precipitation events or
snow melts.
b. For temporarily idle sites: up to 72 hours after precipitation events
7. BMP Maintenance
A. Maintenance of BMP's shall occur regularly to ensure functionality.
8. Record Keeping
Records shall include photographic documentation and an inspection log (date of
inspection and observations).
9. Interim And Final Stabilization
A. Seeding Plan
Soil preparation, soil conditioning or topsoil, seeding (native), and mulching (weed
free), will be required for an estimated 2.0 acres of disturbed area along access road
(where bare soil is not part of the traveled way) and stockpile. The following types
and rates shall be used:
B. Seeding Application: Drill seed 0.25 inch to 0.5 inch into the soil. In small areas
not accessible to a drill, hand broadcast at double the rate and rake 0.25 inch to
0.5 inch into soil.
C. Mulching Application: Apply 1 �/2 tons of certified weed free hay per acre
mechanically crimped into the soil (can be in combination with an organic mulch
tackifier).
4
D. Special Reauirements: Due to high failure rates, hydromulching and/or
hydroseeding will not be allowed.
E. Soil Conditioning And Fertilizer Requirements:
Fertilizer will not be required on the project.
F. Blanket Application: On slopes and ditches requiring a blanket (<2:1 slopes), the
blanket shall be placed in lieu of mulch and mulch tackifier. Only coconut and
straw
Common Name
Botanical Name
Lbs/Acre
Western wheatgrass
Pascopyrum smithii Rosanna"
7
Slender wheatgrass
Elymus trachycaulus "Pryor"
5
Sheep fescue
Festuca ovine 'Cover"
1.5
Blue grama
Boute/oua gracills "Hachita"
1
Sandberg bluegrass
Poa sandbergll
1
Idaho fescue
Festuca Idahoensis
1.5
Prairie junegrass
Koeleria macrantha
0.1
Black-eyed Susan
Rudbeckia hlrta
0.1
Rocky Mtn. Penstemon
Penstemon strictus
0.5
Blue flax
Linum Iewisil
0.5
Total
18.2
biodegradable (wildlife friendly) erosion blanket shall be used where blanket is
required.
G. Reseeding Operations/Corrective Stabilization
Prior To Final Acceptance.
1. Seeded areas shall be reviewed during the 14 day inspections by the Erosion
Control Supervisor for bare soils caused by surface or wind erosion. Bare
areas caused by surface or gully erosion, blown away mulch, etc. shall be
regraded, seeded, and mulched (or blanket) applied as necessary.
2. Areas where seed has not germinated after one season shall be evaluated by
the Engineer. Areas that have not germinated shall have seed and mulch (or
blanket) applied.
10.Prior To Final Acceptance
A. Final acceptance shall be with approval by the owner, the ECS and the Town of
Estes Park prior to closure of the permit.
11. Tabulation Of Stormwater Quantities
Description
Unit
Quantity
1,150
Silt Fence (Reinforced)
LF
Erosion Control Supervisor
Hour
20
Seeding (Native-Certlfied Weed
Free)
Acre
2
Mulching (Weed Free Wood
Fiber)
Acre
2
Mulch Tacklfler
Acre
2
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Pavement Marking -Contractor Supplies
TRAFFIC CONTROL PLAN
Location: Dry Gulch Rd, 1000' N Raven Ave
City: Estes Park, Co 80517
For Fletemeyer & Associates
Chad Fletemeyer
Date: September 17, 2014
Drawn By: Tina Smith
Job: Sombrero Site
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