HomeMy WebLinkAboutMOUNTAINRIDGE FARM PUD, FIRST FILING FINAL - 18 92C - SUBMITTAL DOCUMENTS - ROUND 1 - EROSION CONTROL LETTER/REPORTTHIS PRELIMINARY EROSION CONTROL PLAN REPORT FOR MOUNTAIN RIDGE
P.U.D. WAS PREPARED BY LAND DEVELOPMENT SERVICES USING THE CITY
OF FORT COLLINS EROSION CONTROL REFERENCE MANUAL for Construction
Sites, dated January, 1991.
The results of this erosion control study are reported in the
enclosed text and supporting documents, and are shown in further
detail on the Storm Drainage and Erosion Control Plan submitted
concurrently with this report.
Signed this 15th day of July, 1994.
Dennis L. Donovan, P.E.
Land Development Services
309 W. Harmony Road
Fort Collins, Colorado 80526
Phone (303) 225-9244
MOUNTAIN RIDGE FARM P.U.D. FIRST FILING
FINAL EROSION CONTROL PLAN REPORT
The erosion control concepts and general design
considerations for Mountain Ridge Farm P.U.D. First Filing are
outlined in the following paragraphs and shown in further detail
on Exhibit C. The exhibit is the same as for the storm drainage
report, and is titled STORM DRAINAGE & EROSION CONTROL PLAN.
It was determined from the City provided reference manual
and Wind Erodibility Zone Map that the Erodibility Zone for both
Rainfall Erosion and Wind Erosion is moderate for the site. The
areas of concern for the erosion control plan and their pertinent
basin characteristics are as follows:
Subbasin #Is 1 through 9 and 13 and 14 will all flow into
Detention Pond # 247 on the west side of Shields Street during
storm runoff and then.pass through the 27 inch pipe culvert
crossing of South Shields St. Subbasin #'s 10, 11, & 12 will
flow to and through planned drainage swales in Cobblestone
Corners or in Wabash to Shields Street.
Erosion control measures that will be required and installed
include gravel filters at the entrance to all storm drain inlets,
rip -rap protection at the downstream end of storm drain culverts,
reseeding with temporary crops the disturbed overlot grading and
permanent seeding and landscaping of the detention pond area.
Additionally, hay bales and sand bags will be installed and
maintained in the thalweg of the detention pond to better control
siltation migration.
"EFFECTIVENESS CALCULATIONS" for the two areas of concern
are provided after this text. The erosion control measures that
are recommended are compatible with the City's stated goals in
the Erosion Control Ordinance and supporting documents.
To minimize wind erosion from the site it is recommended
that the northwest perimeter of the site be provided barriers of
some type. Snow fence, hay bales, windrows perpendicular to the
predominate northwesterly and southeasterly winds would each be a
helpful improvement. Obviously, watering of haul roads and other
areas likely to create dust problems should be the standard on-
going operation.
The construction schedule for the project is to begin
grading in July, 1994. The first phase of development is
anticipated to be East of Wabash Street to Shields, will be for
58 lots west of Shields St. and to Wabash. The remaining
infrastructure improvements will probably occur over the next
3 or 4 years.
The Standard Forms A through C for each of the combined
basin areas are provided following this text.
MOUNTAIN RIDGE FARM P.U.D. FIRST FILING
FINAL EROSION CONTROL PLAN REPORT
As will be shown on the enclosed forms, the effectiveness of
the the erosion control measures is within the required city
criteria.
RAINFALL PERFORMANCE STANDARD EVALUATION
------------ -------- --------------- --------- ---------------------
PROJECT: V7o v n 1-4 !` P` � ,� % �� V�TANDARD FORM A
COMPLETED BY: PUJ/ -- ' t4r"l, ' 1 1� C1
T1 - n�� ��-.y DATE:---
-------------- ---------- -------------------- ---- -
OEVELOPED ERODIBILITY1 Asb Lsb I` Ssb,:'I Lb Sb PS
SUBBASIN ZONE'
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13 � �►�� z° rc�-4- �, � 1 � � I
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)I/SF-A:1939
EFFECTIVENESS CALCULATIONS
-------------------------�--Y- V---�-----� -
-- -------------------
PROJECT:%1%%G) U 1!i }",'}_ 110 J,�� r' STANDARD FORM B
COMPLETED IBY: U77-7
r DATE: //j
I
Comment
-------'--------------------------------------------------- I
----------------------
MAJORI PS SUB I AREA
BASIN[ (%) IBASINI (Ac) I CALCULATIONS I
----- ------ ----- --------- -----
- -------------------------------
1,, 1 1.{
Erosion Control C-Factor P-Factor
Method Value Value
78
--------------
DI/SF-B:1989
RBD, Inc.
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EROSION CONTROL CONSTRUCTION SEQUENCE
PROJECT: MountainRidge PUD STANDARD FORM C
CALCULATED BY: DKT DATE: 07/14/94
SEQUENCE FOR 1994 ONLY
Indicate by use of a bar line or symbols when erosion control measures will be installed.
Major modifications to an approved schedule may require submitting a new schedule for
approval by the City Engineer•.
YEAR 94 95
MONTH A M J J A S O N D J F M
OVERLOT GRADING
WIND EROSION CONTROL
Soil Roughening
Perimeter Barrier
Additional Barriers
Vegetative Methods
Soil Sealant
Other
RAINFALL EROSION CONTR
STRUCTURAL:
Sediment Trap/Basin
Inlet Filters
Straw Barriers
Silt Fence Barriers
Sand Bags
Bare Soil Preparation
Contour Furrows
Terracing
AsphalVConcrete Pavi
Other
VEGETATIVE:
Permanent Seed Plant!
Mulching/Sealant
Temporary Seed Planti
Sod Installation
Nettings/Mats/Blankets
Other
STRUCTURES: INSTALLED BY .'
MAINTAINED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON