HomeMy WebLinkAboutDrainage Reports - 01/29/1994.... 1
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EROSION CONTROL REPORT
FOR
LOTS 5, 6, 11, 12, 13, 15, 16, 4'• ..
OF
WILLOW LANE
PREPARED
FOR
OILCOM CORPORATION
PREPARED
BY
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80521
303/482-9331
FEBRUARY 28. 1994
____ ___, ~
Final Approvsd Report
.,-~ate Y$/Lt1
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September 28, 1998
Mr. Basil Hamdan
Storm Water Utility
City ofFort Collins
P.O. Box 580
STEWART&\.SSOCIATES
Consulting Engineers and Surveyors
Fort Collins, CO 80522-0580
Dear Basil,
P.E: Willow Lane Erosion Control for Buildings Ma, Mh, Na and Nb
The proposed revised building layout should not require any changes in the erosion control
calculations or procedures from those set forth in this report, which was approved in 1994.
I have revised the building layouts on the map included in the pocket of this report.
Sincerely,
Phillip I. Robinson, P.E. & L.S.
meh
James H. Stewart
and Associates , Inc.
103 S. Meldrum Street
P.O . Box 429
Ft. Collins , CO 80522
970/ 482-9331
Fax 970/482-9382
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_ STEWART&t\SSOC::IATES
Consulting Engineers and Surveyors
February 28, 1994
Mr. Glen Schlueter
Storm Water U~ility
City of Fort Collins
P.O. Box 580
Fort Coll~ns, Colorado 80522
Dear Glen:
The owners of the remaining undeveloped lots in the Willow Lane subdivision
have requested that I prepare the necessary erosion control report and plan
for the development of these lots.
Overlot grading was completed on all of these lots in the 1970's, and
asphalt pavement was installed on some of the lots.
I have prepared the fo 11 owing report in comp 1 i ance with the City of Fort
Collins Erosion Control Criteria.
Sincerely,
~fv?~
Phil 1 i p I. Robinson, P. E. &
Vice President
jrr
enclosures
James H . Stewart
and Associates, Inc .
103 S. Meldrum Street
P.O . Box 429
Ft. Collins . CO 80522
303/482-9331
Fax 303/482 ·9362
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EROSION . CONTROL REPORT FOR
LOTS 5, 6, 11, 12, 13, 15, 16, 17 AND 19
WILLOW LANE
•••
SITE LOCATION
The Willow Lane development is located on the east side of Overland Trail
and approximately one-half mile south of Prospect Road. It is in the Southwest t of the Northwest t of Section 21, Townshtp 7 North, Range 69 West, of the
Sixth P.M:, City of Fort Collins, County of Larimer, State of Colorado. The
site is located above the Pleasant Valley and Lake Canal ditch and, therefore,
is within the canal importation basin. The site is in a high rainfall
erodibility zone and a moderate wind. erodibility zone.
EXISTING SITE .CONDITIONS
The Willow Lane development was started in 1973, and building construction
continued through 1979. Nine of the building sites were overlot graded, but
no buildings were constructed. A plat of the original Willow Lane subdivision
is included with this repor t. to show the areas of Lots 5, 6, 11, 12, 13, 15,
16, 17 and 19. These lots are the sites of the nine buildings proposed for .
construction.
Lots 5 and 6 were overlot graded, but no construction was done, so
presently the lots are covered with 75 percent vegetation. Lots 11 and 12
are also overlot graded, and no pavement of buildings was constructed. Lots
11 and 12 have 70 percent vegetative ground cover. Lots 13, 15 and 16 were
overlot graded, and all asphalt driveways and parking areas were constructed.
There is 60 percent established vegetation on the unpaved portion of Lots 13,
15 and 16. Lots 17 and 19 are graded, and the asphalt drives and parking are
existing. Lot 19 also has a concrete foundation constructed during the 1970's.
The soil portion of Lots 17 and 19 has 50 percent vegetation.
The construction procedure will be to strip the building location site
and construct the foundation. Silt fence sediment barriers will be installed
on the low or runoff side of each building site, and gravel inlet filters will
be placed at the existing curb inlets on Ross Drive. On Lots 5, 6, 11 and
12 the asphalt drives and parking will be installed after the concrete
foundations are constructed and during the completion of the buildings.
A plan of the sites showing the proposed erosion control procedures is
included with this report. Also included are calculations of the performance
standards and ca lcu 1 at ions of the effectiveness of the proposed procedures.
A construction sequence and estimated cost of erosion control procedures is
included.
The rainfall erosion control
wind erosion.
~HZ14 Phillip. Robi nscrn, P.E. & L.S.
procedures will be sufficient to control ,,,,,n,Ru,,.,._,
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. STEWART&l\SSOCIATES 103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482 -9331 FAX 482-9382
Consulting Engineers and Surveyors
By: PIR Date: z.)2i,,/ 79= l I
Project: IN i JI ow Lo." t
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Client: 0 ii COM Cc,rp
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RAINFALL PERFORMANCE STANDARD EVALUATION .
--------. ---------------------· ----------------------------------· --l
PROJECT:,. WilJo-./ L0t~e · STANDARD FORM A I
l~~~~~:~:~c~~:----------------------------------------~~~::_~L~~--l
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HDI/SF-A:1989
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EFFECTIVENESS CALCULATIONS . I PROJECT: -.\tJ;J/ol.,/ -L(7< r-ie ------.---·----------------~STANDARD -FORM -B -1
. . . . . I I COMPLETED ' BY: . DATE: z../zfj 9'f I
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I Erosion Contro1 C-Factor P-Factor 1
1 Method . Value Value Connnent
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------------·---------------------------------------------------------1
MAJOR I PS I SUB AREA I
BASIN (%) BASIN (Ac) CALCULATIONS I
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HDI/SF-B:1989
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EFFECTIVENESS CALCULATIONS . I PRojEcr~--~i,-;~---L;~~---~----.----_----------------~srANoARo-FaRM_s_ l
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COMPLETED . BY: DATE: 2..) u/ 't<f I
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Erosion Control
Method
C-Factor
. Value
. P-Factor
Value
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BASIN (%) BASIN (Ac) CALCULATIONS , I
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HOI/SF-B:1989
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CONSTRUCTION SEQUENCE
.. PROJECT: _.:..a,kl/"""-,;.l,.i))~o __ w _____ Lot~ ...... n ..... e __ _ STANDARD FORM C
DATE: -:;_/ z.y-) 9'9=
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SEQUE:lCE. FOR 19 :1..f:_ ONLY · . COMPLETE~ ~y: -------
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 'f4-. I
MONTH /~ I ;V) I ~ I J I A I .s I O I tJ I D I I I !
--------------------------~------------------------· -----------------------------1
OVERLOT .GRADING , -. I
WIND EROSION CONTROL I
. Soil Roughing i
· Perimeter Barri er I
Additional Barriers i
.Vegetative Methods I
Soil Sealant . I
Other b)Jj .fJ".
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
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VEGETATIVE: I
Pennanent Seed Planting I
Mulching/Sealant I
Temporary Seed Planting I
Sod Installation I
Nettings/Mats/Blankets i
Other E.x isi veo . I
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---------------------------------1----,-----~-----------------------------------------1· . I .. . -
STRUCTURES:· INSTALLED BY MAINTAINED BY ----------
·VEGETATION/MULCHING CONTRACTOR _____ .;..._ ____ _
DATE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON -------------
HDI/SF-C:1989
JANl'A.?:i 1991 8-20 DESIGN CRITERIA
I STEWART&\.SSOCIATES 103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
Consulting Engineers and Surveyors
· I -By: ]7} TS Date: ?.) 2~) "l <1-Client:_()---',"""""', I c __ o"-""'--=Coa.z.--r+-F---Sheet No. _of_
Project: ViHovv .. La rie ·,
. Subject: _C ____ o_s ....... r-'o=--f-____ E...._r-""o_s..._j-=-o_YJ _ _,:C=..;0;...._,,_-A_.;..r_o..;....f _....;.,..f_t{.._C.;;;._;/'--· /_,)-""_1.>ocC_S'_, ______ _
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