HomeMy WebLinkAboutDrainage Reports - 08/28/2002�
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ANdERSON CONSU�TINC� ENC�INEERS, INC.
Civil • Water Resources • Environmental
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May 24, 2002
Mr. Jeff Lakey �'�'�a' �'�� ���U� � ,�
Park Planning and Development �•�'1 ��� ����� Z—
215 North Mason
Fort Collins, Colorado 80522
Re: Homestead Park Pond (ACE Project No. COFC2001.11)
Dear Jeff:
Anderson Consulting Engineers, Inc. (ACE) has completed the erosion control sheet and
related calculations for the revisions to the Homestead Park pond located within the
Ridgewood Hills P.U.D. The following paragraphs discuss the analyses and subsequent
recommendations.
The erosion control plan for the Homestead Park site is shown on Sheet EC-1 of the
construction drawings and is also provided in the back pocket of this letter report.
Rainfall erosion control for the site will consist primarily of seeding/mulching of most
disturbed areas, a silt fence along the northern, eastern and southern perimeters of the
disturbed site, and a straw bale barrier along the proposed swale on the western edge of
the site.
To facilitate the performance standard evaluation and effectiveness calculations, two
� erosion control subbasins were delineated to encompass all proposed areas of
disturbance. Erosion control calculations based on methodologies outlined in the City of
Fort Collins Storm Drainage Criteria Manual are provided as attachments to this letter.
� These calculations indicate that the effectiveness of erosion control measures exceed the
computed performance standard for the site.
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Based on the City of Fort Collins wind erodibility map, the site is in a moderate wind
erodibility zone. If site construction is complete prior to winter weather, permanent
vegetation will be provided in the form of lawn grass seed. If over-wintering is required
using temporary measures, vegetation will be provided over the entire disturbed site in
the form of an annual grass seed. If weather conditions will not readily allow for
germination of the seed, soil roughening is recommended along with wind barriers to be
spaced no greater than 200 feet apart.
A construction sequence for erosion control measures has not been defined, as the overall
' project schedule has not been finalized by Park Planning and Development. However,
the silt fence is recommended for installation at the commencement of construction. '
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cofc2001-I 1 erosion control report.doc Friday, May 24, 2002
' 772 Whalers Way, Suite 200 • Fort Collins, CO • 80525
Phone: (970) 226-0120 • Fax: (970) 226-0121 • www.acewater.com
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, Mr. Jeff Lakey Page Two
May 24, 2002
,
All supporting documentation is provided as attachments. If you have any questions
, pertaining to information contained in this letter or to the attached analyses, please do not
hesitate to contact us
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Sincerely, �
ANDERSO , N ULTING ENGINEERS, INC. �� EGi �,
O��•' /yq,i ,c�
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U. e ;
Aaron M.' Hansen, P.E.
Senior Engineer
Bradle A. Anderson, P.E.
President
AMH/BAA/tlt
Attachments
cofc2001-11 erosion contro{ report,doc Friday, May 24, 2002
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� ANdER50N CONSU�TINCi ENC�INEERS� INC
Civil • Water Resowces � Em�ironmental
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ProjeCt Nu�ber P�ps Of
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By Date
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( Z S a 5.3b
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RAINFALL PERFORMANCE STANDARD EVAIUATION
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PROJECT: �-iowies�COd Pc�k STANQARD FORM A
COMPLETED BY: �YI K �'C • DATE: ���.
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OEVELOPED�ERODIBILITY� Asb � Lsb � Ss5 � lb � Sb � PS
SUBBASIN � ZONE �(ac) �(ft) � ( e) ((feet) � ( o) �( a)
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Jk�iL;2,�Y 1991 8-18 DESIG:1 C3�=��I:
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EFFECTIVEYESS CALCUlATI0N5
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'PROJECT: uomes��ocl I�c�K � STANDARD FORM 6 i
' CO�IPI,ETED BY: YY) I�C Ft _ DATE:
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Eros�on Control C-Factor P-Factor
Method Value Value Comment
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Seeci/iVl,� l�h o-D6 1.d 1 Eo 10% s1oP�
s� I� F�� e 1, o d o, s0
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MAJOR � PS. � SUB � AR�.4 '
BASIN�_(a)_ �BASIN� (Ac)_'
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C�LCULATIQNS
Seed ili�lu �� ----------------------------
�.FF - (1- Co.o6)c� .o)) � i00% _ �`�%
S�ed �11'1"1u1��,
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HOMESTEAD PARK
CITY OF FORT COLLINS
EROSION CONTROL SUBBASIN PLAN
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5'09
EROSION CONTROL SCHEDULE
2002
J A S 0
OVERLOT GRADING
SILT FENCE
STRAW BALE BARRIERS
SOIL ROUGHENING
SEEDING
(3) SfANEO AND ENT
BALES (2' SPACINC
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NOTE: BALES TO BE KEYED
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EROSION CONTROL NOTES:
THE CITY OF FORT COLLINS STORMWATER UTILITY EROSION CONTROL WSPECTOR �
MUST BE NOTIFIED AT LEAST 24 HOURS PRIOR TO ANY CONSTRUCTION ON THIS
SI TE.
ALL REQUIRED PERIMETER SILT FENCING SHALL BE INSTALLED PRIOR TO ANY
LAND DISTURBING ACTIVITY (STOCKPILING STRIPPING, GRADING, ETC..) ALL
OTHER REQUIRED EROSION CONTROL MEASURES SHALL BE INSTALLED AT THE
APPROPRIATE TIME IN THE CONSTRUCTION SEQUENCE AS INDICATED W THE
APPROVED PROJECT SCHEDULE AND PLANS.
ALL SOILS EXPOSED DURING SOIL DISTURBING ACTIVITY SHALL BE KEPT IN A
ROUGHENED CONDITION BY RIPPING OR DISCING ALONG LAND CONTOURS UNTIL
MULCH, VEGETATION, OR OTHER PERMANENT EROSION CONTROLIS INSTALLED.
NO SOILS SHALL REMAIN EXPOSED TO LAND DISTURBING ACTIV�TIES FOR MORE
THAN 30 DAYS BEFORE REQUIRED TEMPORARY OR PERMANENT EROSION
CONTROL (EG. SEED/MULCH, LANDSCAPING, ETC..) IS INSTALLED UNLESS
OTHERWISE APPROVED BY THE STORMWATER UTILITY.
THE PROPERTY SHALL BE WATERED AND MAINTAINED AT ALL TIMES DURING THE
CONSTRUCTION ACTIVITIES SO AS TO PREVENT WIND CAUSED EROSION. ALL
LAND DISTURBWG ACTNITIES SHALL BE IMMEDIATELY DISCONTINUED WHEN
FUGITIVE DUST IMPACTS ADJACENT PROPERTIES, AS DETERMINED BY THE CITY � -
OF FORT COLLWS ENGWEERING DEPARTMENT. ,� `'1� �� �
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ALL TEMPORARY (STRUCTURAL) EROSION CONTROL MEASURES SHALL BE s�� ,�
INSPECTED AND REPAIRED OR RECONSTRUCTED AS NECESSARY AFTER EACH �
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RUNOFF EVENTIN ORDER TO ASSURE CONTINUED PERFORMANCE OF THEIR
WTENDED FUNCTION. ALL RETAINED SEDIMENTS, ESPECIALLY THOSE ON PAVED ��
SURFACES ROADWAYS, SHALL BE REMOVED AND DISPOSED OF IN A MANNER \\ ��-�
AND LOCATION AS TO NOT TO CAUSE THEIR RELEASE INTO ANY DRAINAGE. �
NO SOIL STOCKPILE SHALL EXCEED 10 FEET IN HEIGHT. ALL SOIL STOCKPI�ES
SHALL BE PROTECTED FROM SEDIMENT TRANSPORT BY SURFACE ROUGHENING,
WATERING, AND PERIMETER SILT FENCING. ANY SOIL STOCKPILE REMAINING 'r`��
AFTER 30 DAYS SHALL BE SEEDED AND MULCHED.
;
CITY ORDINANCES PROHIBITS THE TRACKING, DROPPING, OR DEPOSITING SOILS
OF ANY ANY OTHER MATERIAL ONTO CITY STREETS BY OR FROM ANY VEHICLE.
ANY INADVERTENTLY DEPOSITED MATERIALS SHALL BE CLEANED UP
IMMEDIATELY BY THE CONTRACTOR.
Filter Fabric
Attach Sacurely
to Post
Steel or
Wood Post
�Compacted Backfill
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General Notes:
1. The maximum tributary area is limited
to 0.25 acres per 100 feet of fence.
2. Inspect and repair fence after each
storm event. Remove sediment when
one half of the height of the fence has
been filled. Removed sediment shall
be deposited in an area tributary to a
sediment basin or other filtering
measure.
Trench
SILT FENCE
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NOTE: BASEMAP AND REVISED GRADING PROVIDED BY
CITY OF FORT COLLINS PARK PLANNING AND DEVELOPMENT
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RESPONSIBILITY LIMITED TO INFORMATION
CONTAINED ON SHEET EC-1
INSTALL 1506 L.F. OF SILT FENCE
(SEE DETAIL)
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SECTION VIEW
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STRAW BALE BARRIER