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STORM DRAINAGE REPORT
FOR
SCOTT RESOURCES, INC.
AUGUST 27. 1992
Final A proved Report
Date'��
STEWART&ASSOCIATES
Consultin3 En3ineers and Surveyors
103 South lleZdmm S w-et
foat Co"-&L6, CoPoaado 80521
3031482-9331
STORM DRAINAGE REPORT
• SCOTT RESOURCES, INC.
This storm drainage report is for a "use by right" to property owned
by Scott Resources, Inc., 401 Hickory Street, Fort Collins, Colorado 80524.
The site totals 3.02 acres and is zoned for "General Industrial." Currently,
approximately .6 acres are in varied levels of development. These include
asphalt parking, structures, gravel roads and a large area of natural
vegetation. The general topography on the site is shown in detail on the
"Grading and Drainage .Plan" (GDP). This mostly flat site does indicate a
slight slope to the south, southeast toward the Cache la Poudre River.
The site does lie substantially within the 100-year flood plain of the
Cache la Poudre River. Finished floor elevations in this proposed warehouse
will remain above the 4914.2 expected water surface elevation however.
Detention is being developed for control of storms less than the 100-year,
where increases in direct runoff as a'result of this intensified usage could
potentially affect owners downstream.
In summarizing both existing
and proposed basin
conditions,
please
consider the following:
Site Condition Area (ac.)--
I2 Q2
1100
Q100
Existing 3.49 1.1
in/hr 1.1 cfs
3.5 in/hr
4.4 cfs
Improved 3.49 2.4
3.4 cfs
6.8
12.2
Hickory Street .14 2.4
.3
6.8
1.0
Intensity of usage will increase direct runoff from an historic 1.1
cfs, 2-yr to a value for the 100-yr of 12.2 cfs. Noteworthy at this time
is that Hickory Street will not be completed at this time (see Plan and
Profile). However, these flows are being included now to account for future
construction.
The detention previously referred to will substantially enclose the
east, south and west sides of this parcel. Drainage conditions on the
property to the east of Scott Resources should experience an improvement
in historic conditions by construction of the small berm previously mentioned.
Additionally, a 10-foot utility easement along Scott Resources' west property
line will be dedicated. This will allow for any future concerns regarding
storm drainage to be readily addressed. A temporary easement for the
detention area is also being dedicated. The necessity for temporary status
is to allow for future site improvements to coincide with drainage
considerations.
Details of the detention area include a berm held at a constant top
of berm elevation 4974.0. Areas and volumes are indicated on the GDP. The
allowable discharge will not exceed the 2-yr historic previously mentioned.
This will be accomplished by use a 6" PVC drain flowing at .3 foot depth.
This will control runoff volume moving towards Hemlock Street. Control of
•
11
Scott Resources
Page 2
this 3.49 ac will aid an area that is not a concern currently. The shallow
borrow area on the north edge of Hemlock will see less impact than the
previously uncontrolled condition. Additionally, the owner is aware of the
lack of grade in the detention area and is willing to accept maintenance
of this area.
The 6—foot surface pans used as a transition from the asphalt parking
to the grass detention will.carry the 2—year fl.ows... Greater event will
overtop these pans while being contained within.the detention basin.
Maintenance of these onsite facilities will again be the responsibility of
the owner.
Applications for "Flood Plain Use Permit" is attached. A variance for
a nearly flat existing grade which will be maintained in the detention basin
is requested for approval. Additionally, since the area will be maintained
by the owners, any erosion at points of concentrated flow onsite will be
dealt with during the -owner's regular.maintenance practices.,
Should any questions or additional information needs arise during your
review of this report, please do not hesitate in calling our office.
6z4,4 a9.4.f
Richard A. Rutherford, P.E. & L.S.
�`v�P •w�sTc�'• 9
* 5023
°'� O'' ,
EROSION SUMMARY
• SCOTT RESOURCES, INC.
The Scott Resources site has been. considered as a singlebasin for the
purposes of this erosion report. No erosion hazard exists or would result
from the earth work associated with this minor construction project.
Potential water and wind erosion have both been reviewed with the result
being no specific measures are required. Regardless of this outcome,
sequencing of the construction will lead to a minimum of bare earth exposure
at any point in the schedule. It is anticipated that no more than
approximately one —quarter acre will be disturbed at any one time. The thick
(80%) grass and weed vegetation exhibit a strong ability to control the site
erosion currently. Addition of parking, landscaping and a new structure
will aid further in minimizing sediment transport. Wind erosion will not
be specifically addressed since this site falls under the exclusion provision
4.2.1.2 and 4.2.1.3 for moderate erodibility.
The detention berm will be constructed and seeded to minimize any
erosion. This berm was specifically a consideration of the Storm Water
Utility.
This portion of the construction season, mid —summer to late summer,
also work positively in reducing risk of any erosion hazard. Should any
questions arise during your review, please contact us so we may proceed with
the project in a timely manner.
n
U
APPLICATION FOR FLOOD PLAIN USE PERMIT•
NAME, ADDRESS, PHONE OF PETITIONER: SCOTT RESOURCES, INC.
401 Hickory Street, Fort Collins CO 80524 '303/484-7445
• NAME, ADDRESS, PHONE OF OWNER: Clifford C. Thygesen'
3101 Iris Avenue, Suite #215, Boulder CO 80301 303/443-0020
ADDRESS AND/OR LEGAL DESCRIPTION OF PROPERTY IN QUESTION: /401 Hickory Street
401 Hickory Street, Fort Collins CO 80524
DESCRIPTION OF PROPOSED USE, TYPE OF CONSTRUCTION (ZONING). STRUCTURE ELEVATED OR
FLOOD -PROOFED? IF FLOOD -PROOFED WILL HUMAN INTERVENTION BE REQUIRED?
Use will be light industrial manufacturin • zone for 401 Hickory is "General
Industrial": finished floor elevation of this facility is approx. 4.3 feet
above flood plain
EXISTING GROUND ELEV.: 4974 M.S.L.;FINISHED GROUND ELEV.: 4975 M.S.L.
LOWEST HABITAL FLOOR ELEVATION (INCLUDING BASEMENT): 4978.50 M.S.L.
IF FLOOD -PROOFED, TO WHAT ELEVATION: M.S.L.
REGULATORY BASE FLOOD PROTECTION ELEVATION: 4974.2 M.S.L.
VARIANCE FROM ORDINANCE: YES* ✓ NO
*IF YES, ATTACH "APPLICATION FOR VARIANCE OF CITY OF FORT COLLINS FLOOD PLAIN REGULATIONS"
SIGNATURE OF PETITIONER" DATE
FLOOD PLAIN USE PERMIT - APPROVED REFUSED
SIGNATURE OF CITY PERSONNEL
REASON WHY APPLICATION IS REFUSED:
cc: Owner
• Building Inspection
Construction Inspection
Storm Drainage
EASEMENT DEDICATION
•
1J
KNOW ALL MEN BY THESE PRESENTS: That the undersigned, being the owners of
the following described land to —wit, do hereby dedicate and convey for public
use forever a permanent drainage easement and a temporary drainage easement
for detention as described below:
Permanent Drainage Easement: A ten —foot wide drainage easement
situate in a part of Block 22, Riverside Park, City of Fort
Collins, County of Larimer, State of Colorado, five feet on either
side of the centerline which begins at a point on the South
right—of—way of Hickory Street which bears S 89' 57' W 1950.00
feet and again South 38.42 feet and again West 285.40 feet from
the East ; corner of Section 2, Township 7 North, Range 69 West
of the 6 t h P.M. and run thence South 450.00 feet to a point on
the North right—of—way line of Hemlock Street.
Temporary Drainage Easement For Dedication: A detention easement
situate in a part of Block 22 and the West ; of a vacated street
adjacent to and East of said Block 22 which begins at a point
which bears S 89°-57' W 1950.00 feet and again South 320.42 feet
from the East '—, corner of Section 2, Township 7 North, Range 69
West of the 6th P.M. and run thence South 168.00 feet to a point
on the North line of Hemlock Street; thence West 143.00 feet along
the said North line; thence N 22' 35' W 177.00 feet; thence North
69.00 feet; thence..East 65.00 feet_; thence S 66° 11' E.159.56.
feet to the point of beginning.
Witness our hands and seal this ;� day of A.D. 1992.
\N
American Educational Pr ducts, I c.,
By: J11 Q)r!_)ZU
Michael L. Hobbs, Vice President
STATE OF COLORADO)ss
COUNTY OF LARIMER)
a Colorado Corporation
The foregoing instrument was acknowledged before me this `jlS7 day of
1992, by Michael L. Hobbs, Vice President, American
Educational Products, Inc., a Colorado Corporation.
Witness my hand and official seal.
Notary Public
My commission expires: \1 (�
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RAINFALL PERFORMANCE STANDARD EVALUATION
---------------------------------------------------------------------i
PROJECT: Scoff f2E5oURCES STANDARD FORM A
COMPLETED BY: A.V.E. DATE:
I---------------------------------------------------------------------I
IDEVELOPEDIERODIBILITYI Asb Lsb I Ssb Lb Sb I PS
SUBBASIN I ZONE I (ac) (ft). I W. (feet) I W I() I
--------- ----------- I ------- I ------- I ------- I ------- I ------- I -------
AA 49 157S L4% � i I �2,9
A
---------------------------------------
DI/SF-A:1989
0
•
EFFECTIVENESS CALCULATIONS
--------------------------
PROJECT: Scoff R�SouRC6g
COMPLETED BY: �� E
----------------
STANDARD FORM B
DATE:
Erosion Control
C-Factor
P-Factor
Method
-----------------------------------------
Value
Value
Comment
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Ali PiNli �UNDH11oN
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�Esulr CpN>I` �C�.
-------------------------------------
MAJOR PS. SUB AREA
BASIN (;) BASIN (Ac) CALCULATIONS
----- -7--- ----- ----------------- L- ---
-----------------------------
3, %9 ft)-RIN6. CbNSTitL1CSIbN! 5- N%
aw;,
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A.2. ,25 1i(L� L,�,l�N1U FLlCnE12S i 4wu0RTl'Fl�
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C�SINL, VALUL-5 a'�,DvL fNq- C `�
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---------------------------------=--------------------------- -
DI/SF-B:1989
l
C c� CONSTRUCTION SEQUENCE
PROJECT: JC0-rT
STANDARD FORM C
SEQUENCE. FOR 19 Cj% ONLY COMPLETED BY: � �-� q . CC: � DATE: 7 --7
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
MONTH 9 ID 11
---------------------------- ----1- 1 1-- ;
OVERLOT GRADING 1--17---- t---- T---- 1---- ----t---- T----1----
WINO EROSION CONTROL
Soil Roughing..
Perimeter Barrier
Additional Barriers
Vegetative Methods
Soil Sealant
Other
RAINFALL EROSION CONTROL
STRUCTURAL:
Sediment Trap/Basin
Inlet Filters
Straw Barriers'
Silt Fence Barriers
Sand Bags
Bare Soil Preparation
Contour Furrows
Terracing
Asphalt/Concrete Paving
Other
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettings/Mats/Blankets
Other
-------------------------------------------
MDUN16" MAIW,
STRUCTURES: INSTALLED BY CDNyfKLVT0R5,1Nc:
MAINTAINED BY SCirr �hE.c �.CT
VEGETATION/MULCHING CONTRACTOR W A
DATE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON
• HDI/SF-C:1989
JANUA.RY 199L 8-20 . DESIGN CRITERIA
n*
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4/2/79
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ZONE A4
A
7/16/79
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rZONE B
IMM
NTH
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