HomeMy WebLinkAbout08.12.13 Conditions of approval responseCoLoDO
ENGINEERING
1 C0K£ORATE
August 12, 2013
Molly Orkild-Larson
Garfield County Building and Planning Department
108 Eighth Street, Suite 401
Glenwood Springs, Colorado 81601
RE: Tom Tompkins /TLT Services — Conditions of Approval Response
Dear Molly:
Colorado River Engineering, Inc. has reviewed the Conditions of Approval for Tom
Tompkins' Small Contractor Yard entitlement. In accordance with the Conditions, we
are submitting this letter with our responses below.
If you have any questions, please do not hesitate to call (970) 625 -4933 x118.
Sincerely,
Gregory G. Shaner, P.E.
Principal Engineer 11
P.O. Box 1301 I Rifle, Colorado) 81650
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1.-8. Owner and applicant will comply with the stated Conditions of Approval.
9. Applicant will obtain a Certificate of Occupancy within 30 days after receiving the
Land Use Change Permit.
10. The structure is not to be used as a commercial building. In accordance with the
Conditions, if the use changes, the owner will go through the building permit
process as necessary.
11. See copy of Driveway Access Permit attached.
12. Applicant will strive to comply with the CDOW and "Potential Mitigation
Measures" outlined in the Conditions. At the time of construction, the owner
will consult with Steve Dahmer of Environmental Solutions, Inc. on any noxious
weed identification or mitigation as part of the Weed Management Plan
implementation.
13. The Watershed Permit has already been obtained and submitted.
Correspondence has been provided to Garfield County separate of this submittal
by the Town of Parachute.
14. The following list is the Generic Seed Mix for Region 3 (below 6,500 ft elevation)
obtained from CDOT. The seed mix can also be found on Sheet 4 — Grading/
Erosion & Sediment Control Plan 4 -502 (C)(4) of the project plans.
Common Name Scientific Name Lbs PLS /Acre
"Egan" American sloughgrass Beckmannia syzigachne 3 (wet areas,
omit if not needed)
"Star Lake" Indian ricegrass Achnatherum hymenoides 6
"Vaughn" Sideoats grarna Bouteloua curtipendula 7
"Arriba" Western wheatgrass Pascopyrum smithii 8
"Salado " Alkali sacaton Sporobolus airoides 2
VNS, Sand dropseed Sporobolus cryptandrus 1
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15. The total surface area to be disturbed by the berm is approximately 8,500 square
feet (roughly 0.2 acre).
16. The owner will provide the revegetation security once determination of the cost
has been completed.
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P.O. Box 1301 , Rifle, Colorado' 81650
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17. The owner will comply with the responsibility of watering the proposed
landscape.
18. An updated Grading /Erosion and Sediment Control Plan has been attached. The
water tanks will be placed high on the berm with a gravity drain line running
down the top of the berm to feed drip irrigation. Fuel tanks will be placed next
to the building and will have their own 150% containment (tank or barrier).
19. The Stormwater Permit will be submitted to the State of Colorado 20 days prior
to any excavation or construction.
20. Drainage calculations and supporting documents (rainfall precipitation values,
historic and proposed basin maps) have been attached to this letter.
Calculations were run for the 2 -yr, 25 -yr, and 100 -yr rainfall events. A summary
of the peak flow rates calculated can be seen in the table below.
Basin
2 -yr Flow (cfs)
25 -yr Flow (cfs)
100 -yr Flow (cfs)
H -1
0.17
0.33
0.42
P -1
0.16
0.31
0.40
3IPage
P.O. Box 1301 I Rifle, Colorado 1 8 1650