HomeMy WebLinkAboutSite Certifications - 12/10/1996STORMWATER
�/ RECEIVED
aV$ Redpeak Engineering AUG 2 7 1996
�Q \ 2061 Huntington Circle
Fort Collins, CO 80526 y r
(970) a98-0272 40 619 6
Q A g 27,1996
Mr. Basil Hamden
Stormwater Utility°
City of Fort Collins
235 Mathews Street
Fort Collins, CO 80524 J \ �a��^" �hGQ� o„
RE: �Liurie_SutidiVis-ion--(AKA Chelsie Ridge Subdivision.
Final Stormwater Certification
Project Number: 93-907901-d
Dear Basil: 2 5
I am writing this letter as an addition to my left t of December 18,1995 relating to the final
certification of stormwater improvements for the Chelsie Ridge Subdivision. My previous
letter of December 18, 1995 relates only to the Shields Street Improvements which I
designed in late 1993. The information contained herein relates to all other on -site
improvements which were designed by Jack Johnson Company and approved by the City
of Fort Collins in March 1993 as part of a twelve sheet set of construction drawings.
Please find attached a set of redline drawings completed by Intermill Land Surveying in
March of 1996. 1 have plotted the information from the field survey on the construction
plans for your review. I believe that the subdivision as built is in substantial conformance
with the construction plans approved by the City of Fort Collins, however I would like to
include the following information for your consideration:
1. Overall Grading
Grading for this project was limited to roadway areas only. Overlot grading was not
proposed in order to minimize disruption of the vegetation. All lots, therefore, were left in
a natural state. Currently, site grading and erosion control is being considered on a lot by
lot basis as building permits are requested.
Mr. Basil Hamden
Stormwater Utility
August 27, 1996
Page Two
2. Site Topography
You will notice differences between the design grades and the actual "As -Built"
elevations. It does not appear that these differences significantly impact the roadway or
drainage improvements. It appears that the reason for these discrepancies is the result of
unverified topography of unknown origin used by the Jack Johnson Company.
3. Culverts
A table has been provided to summarize information for the pipes underneath the
private driveway. Despite a flattening of the pipe grades, they will still carry design flows.
4. Southerly Swale
A swale was proposed along the south boundary of lots 5 and 6. A small swale was
built as shown, however, it is difficult to determine adequacy since there is no design
section indicated on the plans. A field review does not indicate any erosion or wash -out of
the existing swale. The westerly 50' of this swale has been removed along lot 6. This was
done as approved on the building site plan. All swales are within the proposed easements.
5. Irrigation Ditches
An active private irrigation ditch remains along the north edge of lots 1 and 9. The
owner is currently working with the adjacent property owners to abandon this ditch. The
owner is also currently modifying the ditch where it enters the property to insure that it will
drain to the west and not impact lots 1 and 9.
An overflow channel and headworks has been added to the Applewood Estates
Irrigation Ditch. These improvements are not shown on the plans. They are to be
considered privately maintained improvements which were added as part of the
construction to improve the function and appearance of the Applewood Ditch.
S. Utilities
Sanitary sewer manhole #3 at the west end of Wooded Creek Court has been moved
50't to the east. This field change does not impact the project.
6
Mr. Basil Hamden
Stormwater Utility
August 27,1996
Page Three
7. Riprap Structures
Erosion controllenergy dissipation structures were constructed at each end of the 48"
and 18" pipe built under the private driveway. It is impossible to determine the extent of
these structures at this time (almost two years after they were constructed). I talked to Dave
Simpson of Connell Resources, who constructed the project and he indicated that they
were staked and built according to plan. A field review of the installation after two years of
service indicates that they have functioned well and no upstream or downstream erosion
at either culvert installation is evident. Generally, a flattening of the pipe grades should
lower velocities making the design of these structures more conservative.
Based on numerous field reviews, meetings with the surveyor and owner and conversations
with the contractor, I would support acceptance of the drainage improvements for Chelsie
Ridge and recommend the release of all building permits and the erosion control escrow
funds. This certification is signed and stamped and attests to the best of my knowledge that
the "as -built" condition of the drainage facilities are as described above and as shown in
the enclosed redline plans. Please call me at 498-0272 if you have additional questions.
Sincerely,
Jeff Couch, P.E.
Enclosures
cc: Lee Barker, Classic Custom Builders
Rob Persichitte, Intermill Land Surveying
Culvert Summary
Invert
Invert
Pipe
Pipe
In
Out
Drop
Length
Grade
Capaci
18"
Plan
5066.00
5057.00
9.00,
67'
13.43%
—
18"
"As -Built"
5064.95
5058.61
6.34'
67'
9.46%
35 cis
48"
Plan
5046.00
5041.00
5.00'
100'
5.00%
350 cfs
48"
"As -Built"
5046.84
5042.81
4.03'
100'
4.03%
300 cfs
Design flows based on values shown on sheet 12 of 12. Actual pipe capacity flows
based on Concrete Pipe Design Manual, Figure 5, Page 192 for concrete pipe flowing full
(n=0.013).
Anticipated flow for 18" pipe is 5.79 cfs. Actual capacity of 35 cfs far exceeds this
number.
Anticipated flow for 48" pipe is 40.30 cfs. Even adding 60 cfs for Pleasant Valley and
Lake Canal overflow will not impact pipe capacity of 300 cfs.
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CALL
UTILITY NOTIFICATION
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Revision Blqck- Redpeak
RaY3aa�-+5B3_. addedtS. opP�=hanePd paying plan Designed BY: JW� Pr0)BCt No. 93-9:, _ akam
_ Drawn By RJ 1 uate _4 15-93
R@.�a d,e�s�AodQa_aca.egsala'L sidewalk notes Checked By:- J-WCScale: _1'=20' H17RZ Engineering So
— . -- 10= 2' mmI j
Laurie Subdivision P.U.D.
;helsie Ridge Subdivision P.U-
h Shields Street Plan/Profile 1
AS - BUILT MAP
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