HomeMy WebLinkAboutWESTBURY PUD, FIRST FILING - FINAL - 11-94A - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTTerracon
Linder Real Estate
ELI Project No. 20945005
• Subsurface Drainage: Free -draining, granular soils containing less than five percent fines
(by weight) passing a No. 200 sieve should be placed adjacent to walls which retain earth.
A drainage system consisting of either weep holes or perforated drain lines (placed near the
base of the wall) should be used to intercept and discharge water which would tend to
saturate the backfill. Where used, drain lines should be embedded in a uniformly graded
filter material and provided with adequate clean -outs for periodic maintenance. An
impervious soil should be used in the upper layer of backfill to reduce the potential for
water infiltration.
Additional Design and Construction Considerations:
• Exterior Slab Design and Construction: Exterior slabs -on -grade, exterior architectural
_ features, and utilities founded on, or in backfill may experience some movement due to the
volume change of the backfill. Potential movement could be reduced by:
• minimizing moisture increases in the backfill
• controlling moisture -density during placement of backfill
• using designs which allow vertical movement between the exterior features
and adjoining structural elements
• placing effective control joints on relatively close centers
• allowing vertical movements in utility connections
• Corrosion Protection: Results of soluble sulfate testing indicate that ASTM Type 1/II
Portland cement is suitable for all concrete on and below grade. Foundation concrete
should be designed in accordance with the provisions of the ACI Design Manual, Section
318, Chapter 4.
GENERAL COMMENTS
It is recommended that the Geotechnical Engineer be retained to provide a general review of final
design plans and specifications in order to confirm that grading and foundation recommendations
have been interpreted and implemented. In the event that any changes of the proposed project
are planned, the conclusions and recommendations contained in this report should be reviewed
and the report modified or supplemented as necessary.
The Geotechnical Engineer should also be retained to provide services during excavation, grading,
foundation and construction phases of the work. Observation of footing excavations should be
performed prior to placement of reinforcing and concrete to confirm that satisfactory bearing
_ materials are present and is considered a necessary part of continuing geotechnical engineering
services for the project. Construction testing, including field and laboratory evaluation of fill,
backfill, pavement materials, concrete and steel should be performed to determine whether
L.
Linder Real Estate
ELI Project No. 20945005
Terracon
The soils to be penetrated by the proposed excavations may vary significantly across the
site. The preliminary soil classifications are based solely on the materials encountered in
widely spaced exploratory test borings. The contractor should verify that similar conditions
exist throughout the proposed area of excavation. If different subsurface conditions are
encountered at the time of construction, the actual conditions should be evaluated to
determine any excavation modifications necessary to maintain safe conditions.
As a safety measure, it is recommended that all vehicles and soil piles be kept to a
minimum lateral distance from the crest of the slope equal to no less than the slope height.
The exposed slope face should be protected against the elements.
The contractor should retain a geotechnical engineer to monitor the soils exposed in all
excavations and provide engineering services for slopes. This will provide an opportunity
to monitor the soil types encountered and to modify the excavation slopes as necessary.
It also offers an opportunity to verify the stability of the excavation slopes during
construction.
Drainage:
• Surface Drainage:
Positive drainage should be provided during construction and maintained throughout
the life of the proposed residences. Infiltration of water into utility or foundation
excavations must be prevented during construction. Planters and other surface
features which could retain water in areas adjacent to the building or pavements
should be sealed or eliminated.
2. In areas where sidewalks or paving do not immediately adjoin the structure, we
recommend that protective slopes be provided with a minimum grade of
approximately 10 percent for at least 10 feet from perimeter walls. Backfill against
footings, exterior walls, and in utility and sprinkler line trenches should be well
compacted and free of all construction debris to reduce the possibility of moisture
infiltration.
3. Downspouts, roof drains or scuppers should discharge into splash blocks or
extensions when the ground surface beneath such features is not protected by
exterior slabs or paving.
4. Sprinkler systems should not be installed within 5 feet of foundation walls.
Landscaped irrigation adjacent to the foundation system should be minimized or
eliminated.
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j Terracon
Linder Real Estate
ELI Project No. 20945005
J
Zones of perched and/or trapped groundwater may also occur at times in the subsurface soils
Joverlying bedrock, on top of the bedrock surface or within permeable fractures in the bedrock. The
location and amount of perched water is dependent upon several factors, including hydrologic
conditions, type of site development, irrigation demands on or adjacent to the site, fluctuations
in water features and seasonal and weather conditions. The possibility of groundwater
_ fluctuations should be considered when developing design and construction plans for the project.
GROUNDWATER MONITORING WELLS
.J
Groundwater monitoring wells 1 A and 2A were installed in filings 1 and 2, respectively, on March
j 25, 1994 to aid in the design of a subsurface drainage system by other consultants. The
J monitoring wells were constructed with 2-inch diameter manufactured well screen and casing
_ material. Monitoring wells 1 A and 2A were installed to depths of approximately 20.5 and 9.5 feet
below site grade, respectively. Well construction details are shown on the groundwater
monitoring well profiles in Appendix A.
J
CONCLUSIONS AND RECOMMENDATIONS
JFoundation Systems: Based on the, soil characteristics encountered on the site, spread footing
_ foundations bearing upon undisturbed subsoils are recommended for support of the proposed
residences. The footings may be designed for a maximum bearing pressure of 1,500 psf (dead
load plus half live load). In addition, the footings should be sized to maintain a minimum dead -load
pressure of 500 psf. Exterior footings should be placed a minimum of 30 inches below finished
grade for frost protection. Finished grade for perimeter footings is the lowest adjacent grade.
Footings should be proportioned to minimize differential foundation movement. Proportioning on
the basis of equal total settlement is recommended; however, proportioning to relative constant
dead -load pressure will also reduce differential settlement between adjacent footings. Total or
Jdifferential settlement resulting from the assumed structural loads are estimated to be on the order
of %-inch provided that foundations are constructed as recommended.
JAdditional foundation movements could occur if water from any source infiltrates the foundation
_ soils; therefore, proper drainage should be provided in the final design and during construction.
Foundations, and masonry walls should be reinforced as necessary to reduce the potential for
distress caused by differential foundation movement. The use of joints at openings or other
J discontinuities in masonry walls is recommended.
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Linder Real Estate
ELI Project No. 20945005
SUBSURFACE CONDITIONS
Terracon
'- Soil and Bedrock Conditions: The following describes the characteristics of the primary soil strata
- encountered at the site in order of increasing depths.
• Topsoil. A 'h-foot layer of silty topsoil was encountered at the surface of the test borings.
The topsoil has been penetrated by root growth and organic matter.
• Lean Clay with Sand. A layer of brown clay was encountered below the topsoil and
extends to depths of 1 to 4 feet below the surface. The lean clay is moist and contains
moderate quantities of sand.
_ • Sandy Lean Clay. A layer of red clay was encountered below the topsoil and/or brown clay
and is interbedded with a granular stratum. The red clay contains substantial quantities of
sand and is moist to wet with depth.
• Sand with Gravel. The granular stratum was encountered in 5 of the 8 test borings
between depths of 8 and 15 feet. The sand with gravel is relatively clean and is moist to
wet with depth.
• Claystone/Siltstone Bedrock. The bedrock stratum was encountered at a depth of 4 feet
in the test boring for monitoring well 2A in the 2nd Filing of the subdivision. The upper 4'/z
feet of the bedrock is highly weathered.
Field and Laboratory Test Results: Field test results indicate that the clay soils vary from medium
stiff to very stiff in consistency. The sand soils vary from loose to medium dense in relative
density. The weathered bedrock is soft and the underlying bedrock is moderately hard. The soils
at anticipated foundation bearing depths have moderate load bearing. capability.
Laboratory test results indicate that clay soils at anticipated foundation bearing depths have low
expansive potential.
Groundwater Conditions: Groundwater was encountered at depths of 11.3 to 14.3 feet in five
the test borings at the time of field exploration. When checked one day after drilling, groundwater
J was measured at depths of 10.8 to 13.1 feet in five of the test borings. These observations
represent only current groundwater conditions, and may not be indicative of other times, or at
other locations. Groundwater levels can be expected to fluctuate with varying seasonal and
J weather conditions and fluctuations in the flow of the Pleasant Valley and Lake Canal.
4
EXHIBIT "A"
Easement "A":
A 20.00 foot wide drainage easement si-tuate in t)ie Northwest
} of the Northwest } of Section 2, Township 6 North, Range 69 West
of the 6th P.M., .City of Fort Collins, -County of Larimer, State
of Colorado, which considering tile West line of.the said Northwest
} as.bearing N 00° 08' 30" E and with all bearings contained herein
relative thereto, the center line of which begins at a point on
the East line of Shields Street which bears S 00° 08' 30" W 1221.32
feet and again N 89° 11' 30" E 50.00 feet from the Northwest corner
of said Section 2 and run thence along the arc of a 262.71 foot
radius curve to the right a distance of 146.87 feet, the long chord
of which bears S 74° 47' 34" E 144.97 feet; thence S 58° 46'
37" E 42.59 feet; -thence along -the arc of a 180.00 foot radius
curve to the left a distance of 100.63 feet, the long chord of
.which bears S 74° 47' 34" E 99.32 feet; thence N'89° 11' 30" E
352.59 feet; thence along the arc of a 30.00 foot radius curve
to the left a distance of 47.12 feet,, the long chord of which bears
N 440 11'' 30" E 42.43 feet; thence' N 00° 48' 30" W 120.89 feet
to a point on the centerline of an existing drainage swale.
Construction Easement for Swale "A":
A temporary construction easement situate in the Northwest
of the Northwest } of Section 2, Township 6 North, Range 69 West
of the 6th P.M., City of Fort Collins,,County of Larimer, State
of Colorado, which considering the West line of the said Northwest
} as bearing N 00° 08' 30" E and with all bearings contained herein
relative thereto, which begins at a point on the East line of
Shields Street which bears S 000 08' 30" W 1201.32 feet and again
N 890 11'.30" E 50.00 feet from the Northwest corner of said Section
2 and run thence N 89° 11' 30" E 200.00 feet; thence S 00' 08'
30" W 50.00 feet; thence N 89° 11' 30" E•395.00 feet; thence
N 000 08' 30" E 90.89 feet; -thence N 89° 11' 30" E 50.00 feet;
thence S 000 08' 30" W 160.89 feet; thence S 89' 11' 30" W 515.00
feet; thence N 00° 08' 30" E 50.00 feet, thence S 890 11' 30" W
130.00 feet; thence N 00° 08' 30" E 70.00 feet to the point of
beginning.
This construction easement shall be for a term of two (2) years from
the date of this EASEMENT DEDICATION and shall automatically
terminate at the expiration of said two (2) year term unless
extended by written consent of the owners and such consent recorded
with the Clerk and Recorder of the county of Larimer, state of
Colorado.
Notice of change of address shall be given.. in the same manner
as any other notice.
6. Headings. Headings used herein are for convenience of
reference only and shall in no way define, limit, or proscribe the
scope or intent of the provisions of this Agreement.
7. Time of the Essence. The parties agree that time shall
be of the essence of this Agreement.
S. Binding_ Effect. The parties agree that this Agreement
shall be binding upon the parties hereto, their heirs, executors,
personal representatives, successors and assigns.
THIS AGREEMENT made and entered into in the state of Colorado
the day and year first above written.
OWNERS:
POUDRE SCHOOL DISTRICT NO. R-1
ATTEST:
Secretary
ATTEST:
Secretary
ATTEST:
Secretary .
By
President
THOMPSON SCHOOL DISTRICT NO. R-2J
By
President
PARK SCHOOL DISTRICT NO. R-3
By
President
WESTBURY LLC, a Colorado limited
liability company
By
Mark A. Linder, Manager
3
(10) days prior to commencement of construction. Owners shall not
unreasonably withhold approval. In the event that Owners fail to
respond to Developer within ten (10) days of submittal to Owners,
or Owners' representative, of the plans and specifications, Owners'
consent shall be deemed to have been received.
3. Maintenance. Developer agrees to maintain Easement "A"
so that water will properly flow through the easement. If the
easement is constructed in such a way that it may be mowed by
Owners when mowing adjacent property, then the owners will mow the
easement without cost to Developer. Otherwise, Developer will
maintain the easement in a reasonable manner. Developer intends to
develop land west of South Shields Street and in that event the
homeowners association shall assume the responsibility for
maintenance and the Developer shall be released of further
responsibility.
4. Owners' Covenants. The Owners covenant and agree to:
A. Execute and deliver any reasonable maps,
dedications, consents, permits, applications, and other documents
required for the dedication, construction, and use of the
Easements, so long as the cost and expense of such dedications,
maps, consents, permits, applications, and other documents require
no cost, expense, or guarantee of construction by the Owners. All
costs shall be borne by the Developer.
B. Execute and deliver to Developer for delivery to the
City of Fort Collins, Colorado, the EASEMENT DEDICATION attached
hereto.
5. Notice. Any notice or other communication given by
either party hereto to the other relating to this Agreement, shall
be sent by registered or certified mail, return receipt requested,
or hand delivered, addressed to such other party at the respective
address as set forth below; and such notice or other communication
shall be deemed given when so mailed or hand delivered.
If to Owners: POUDRE SCHOOL DISTRICT NO. R-11
THOMPSON SCHOOL DISTRICT NO. R-2J,
and PARK SCHOOL DISTRICT NO. R-3
c/o Front Range Community College,
Larimer Campus
4616 South Shields Street
Fort Collins, CO 80526
If to Developer: Westbury LLC
c/o Linder Real Estate and
Development Co.
3500 JFK Parkway, Suite 221
Fort Collins, CO 80525
F
AGREEMENT
THIS AGREEMENT is made and entered into this day of
, 1994, by and between POUDRE SCHOOL DISTRICT NO. R-1,
THOMPSON SCHOOL DISTRICT NO. R-2J, and PARK SCHOOL DISTRICT NO. R-3
("Owners"), and WESTBURY LLC, a Colorado limited liability company
("Developer").
WITNESSETH:
WHEREAS, Developer intends to develop land located west of
South Shields Street and west of the easements described on Exhibit
"A" attached hereto and incorporated herein by reference,
respectfully referred to as the "Development Property" and the
"Easements";
WHEREAS, the Easements (Exhibit "A") describe Easement "A", a
construction easement for Easement "A", and Easement "B";
WHEREAS, Easement "B" presently exists by use by right and is
used -by the owners to discharge water from Owners' property into
Mail Creek; and
WHEREAS, the parties desire to enter into this Agreement to
meet the requirements of the City of Fort Collins, Colorado, for
the dedication of common easement and to provide for the proper
identification, mapping, and construction of the Easements.
NOW, THEREFORE, in consideration of their mutual promises
herein contained, the parties agree as follows:
1. Preamble. The parties agree that the preamble
hereinabove set forth shall be, and the same hereby is,
incorporated into and made a part of this Agreement by reference.
2. Developer Covenants. The Developer agrees as follows:
A. Developer shall, at its sole expense, pay all costs
for surveying, engineering, and drafting of the legal description
and map of the Easements, and the construction plans and
specifications for Easement "A".
B. The Developer shall pay all costs and expenses to
develop Easement "A" and after construction shall return Easement
"A" and the construction easement area, except for the constructed
facilities, to their natural state by leveling and seeding with
appropriate approved grass cover. The Developer shall replace any
trees or shrubs damaged during the construction operation. The
water drainage facilities shall be designed and constructed to meet
the requirements of the City of Fort Collins, Colorado. All
construction shall be done in a good and workmanlike manner. All
construction plans and specifications shall be submitted to Owners,
or Owners' designated representative, for comment not less than ten
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ExgrDIT "A"
(To Easement Dedication from Poudre School District No.
R-1, Thompson School District No. R-2J, and Park School
'District No. 3 to the City of Fort Collins, Colorado)
Easement "A":
A 20.00 foot wide drainage easement situate in the Northwest
} of the Northwest } of Section 2, Township 6 North, Range 69 West
of the 6th P.M., City of Fort Collins, -County of Larimer, State
of Colorado, which considering the West line of the said Northwest
} as.bearing N 00" 08' 30" E and with all bearings contained herein
relative thereto, the centerline of which begins at a point on
the East line of Shields Street which bears S 00° 08' 30" W 1221.32
feet and again N 89° 11' 30" E 50.00 feet from the Northwest corner
of said Section 2 and run thence along the arc of a 262.71 foot
radius curve to the right a distance of 146.87 feet, the long chord
of which bears S 74° 47' 34" E 144.97 feet; thence S 58' 46'
37" E 42.59 feet; thence along the arc of a 180.00 foot radius
curve to the left a distance of 100.63 feet, the long chord of
which bears S 74° 47' 34" E 99.32 feet; thence N 89° 11' 30" E
352.59 feet; thence along the arc of a 30.00 foot radius curve
to the left a distance of 47.12 feet,, the long chord of which bears
N 440 11' 30" E 42.43 feet; thenc6''N 000 46' 30" W 120.89 feet
to a point on the centerline of an existing drainage Swale.
Construction Easement for Swale "A":
A temporary construction easement situate in the Northwest
} of the Northwest } of Section 2, Township 6 North, Range 69 West
of the 6th P.M., City of Fort Collins,,County of Larimer, State
of Colorado, which considering the West line of the said Northwest
} as bearing N 00' 08' 30" E and with all bearings contained herein
relative thereto, which begins at a point on the East line of
Shields Street which bears 5 007 08' 30" W 1201.32 feet and again
N 890 11' 30" E 50.00 feet from the Northwest corner of said Section
2 and run thence N 89° 11' 30" E 200.00 feet; thence S 00° 08'
30" W 50.00 feet; thence N 89° 11' 30" E•395.00 feet; thence
N 000 08' 30" E 90.89 feet; 'thence N 890 11' 30" E 50.00 feet;
thence S 00° 08' 30" W 160.89 feet; thence S 89° 11' 30" W 515.00
feet; thence N 00° 08' 30" E 50.00 feet; thence S 89° 11' 30" W
130.00 feet; thence N 00° 08' 30" E 70.00 feet to the point of
beginning.
This construction easement shall be for a term of two (2) years from
the date of this EASEMENT DEDICATION and shall automatically
terminate atthe expiration of said two (2) year term unless
extended by written consent of the owners and ouch consent recorded
with the Clerk and Recorder of the county of Lorimer, state of
Colorado.
Easement "8":
A 30.00 foot wide drainage easement situate in the North }
of the Northwest } of Section 2, Township 6 North, Range 69 West
of the 6th P.M., City of Fort Collins, County of Larimer, State
of Colorado, which considering the West line of the said Northwest
} as bearing N 00° 08' 30" E and with all bearings contained herein
relative thereto, the centerline of which begins at a point which
bears S 31° 56' 41" E 1082.02 feet from the Northwest corner of
said Section 2 and run thence 5 24° 46' 15" E 219.37 feet; thence
along the arc of a 64.75 foot radius curve to the left a distance
of 101.67 feet, the long chord of which bears S 69° 45' 01" E 91.55
feet; thence N 65° 16' 12" E 680.56 feet; thence along the arc
of a 59.94 foot radius curve to the left a distance of 94.51 feet,
the long chord of which bears N 20° 06' 19" E 85.02 feet; thence
N 250 03' 34" W 222.22 feet; thence along the arc of a 52.90 foot
radius curve to the right a distance of 54.58 feet, the long chord
of which bears N 04' 30' 00" E 52.19 feet; thence Il 34' 03' 33" E
300.86 feet; thence along the arc of a 317.09 foot radius curve
to the right a distance of 268.23 feet, the long chord of which
bears N 58° 17' 34" E 260.31 feet; thence N 82° 31' 35" E 228.72
feet; thence along the arc of a 100.64 foot radius curve to the
left a distance of 90.71 feet, the long chord of which bears
N 560 42' 13" E 87.67 feet; thence N 30° 52' 51" E 28.57 feet to
a point on the centerline of Flail Creek.
'._ STATE OF COLORADO )
SS.
County of Larimer )
On. this day of 1994, before me
a Notary Public in and for said state,
personally appeared, as president, and
as secretary of THOMPSON SCHOOL DISTRICT
NO. R-2J, known to me to be the persons who executed the foregoing
document and acknowledged to me that they executed the same for the
{ purposes therein stated.
I
. 3
Notary Public
My commission expires:
STATE OF COLORADO )
SS.
County of Larimer )
On this day of , 1994, before me
a Notary Public n and for said state,
personally appeared, as president, and
as secretary of PARK SCHOOL DISTRICT NO.
R-3, known to me to be the persons who executed the foregoing
document and acknowledged to me that they executed the same for the
purposes therein stated.
Notary Public
My commission expires:
ATTORNEY'S CERTIFICATE
This is to certify that on the day of A.D.,
1994, I examined the title to the property as described erh eon and
established that the owners and proprietors of record of the said
property as construed in S 31-23-111, C.R.S., 1973, are as shown
hereon as of said date.
Registration No.
Attorney
2
d EASEMENT DEDICATION
KNOW ALL MEN BY THESE PRESENTS:
For Ten Dollars ($10) and other good and valuable
consideration, the receipt and adequacy of which are hereby
acknowledged, the undersigned, POUDRE SCHOOL DISTRICT NO. R-1,
THOMPSON SCHOOL DISTRICT NO. R-2J, and PARK SCHOOL DISTRICT NO.
R-3, of the county of Larimer, state of Colorado, the owners of the
following described land:
The easements described on Exhibit "A" attached hereto
1 and incorporated herein by reference, said land being
i situate in the county of Larimer, state of Colorado,
do hereby dedicate, transfer, and convey to the CITY OF FORT
COLLINS, Colorado, for public use forever a temporary construction
easement and a permanent easement for water drainage and utilities,
the drainage facilities and utilities may be constructed and
maintained above ground and/or below ground, together with the
right of ingress and egress for the construction, maintenance,
repair, and operation of the easement facilities. The easements
are described on Exhibit "A" attached hereto and incorporated
herein by reference.
It is understood by the undersigned that, by acceptance of
this dedication, the City of Fort Collins does not accept the duty
of constructing the drainage and utility facilities, or the
maintenance and repair of the utility facilities and the easement.
Witness our hands and seals this day of , 1994.
GRANTORS:
POUDRE SCHOOL DISTRICT NO. R-1
ATTEST:
BY
Secretary President
THOMPSON SCHOOL DISTRICT NO. R-2J
ATTEST:
BY
Secretary President
PARK SCHOOL DISTRICT NO. R-3
ATTEST:
By
Secretary President
STATE OF COLORADO )
SS.
County of Larimer )
On this day of 1994, before me
a Notary Public n and for said state,
personally appeared, as president, and
as secretary of POUDRE SCHOOL DISTRICT
NO. R-1, known to me to be the persons who executed the foregoing
document and acknowledged to me that they executed the same for the
purposes therein stated.
Notary Public
My commission expires:
APPENDIX"
CONSTRUCTION SEQUENCE
PROJECT: W -5L E-g EiFI4` Fd(Of _
STANDARD FORM C
SEQUENCE. FOR 19 ONLY COMPLETED BY: DATE: G G I
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-
OVERLOT GRADING I
WIND 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
Nettinas/Mats/Blankets
Other
STRUCTURES: INSTALLED BY
� 4-
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VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED
HDI/SF-C:1989
I I I I
-----+---------}-----
APPROVED BY CITY OF FORT COLLINS ON
8-20 DESIGN CRITc'Ia
JA`7i A?'i 1991
EFFECTIVENESS CALCULATIONS
------------=--- ----------- - -----------------------------------
PROJECT: �.✓es��ury Flrf F7�J�S STANDARD FORM B
'COMPLETED BY: DATE: C < �jQ
I
Erosion Control C-Factor P-Factor
Method Value Value Comment
----------------------------------------------------------
-------------
MAJORI PS
BASIN (%)
I
F1 R.
F-1 Q
7B, Z
-------------------------------------------------
SUB AREA
BASIN (Ac) CALCULATIONS
------ --------------------------
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2. ¢X7 r4) t (I.6 0(6-3 �-) }(z.03)(7ti.Z) +�(76- P:
7.75-�
C�� = 71,3
F
----------------------------------------------------------------------
DI/SF-B:1989
EFFECTIVENESS CALCULATIONS
+------------------------------- 1r---------------------------------
PROJECT: `JPLs bury 1=irs{ F)11'�9 STANDARD FORM B
(COMPLETED BY: / DATE: G �¢
Erosion Control
C-Factor
P-Factor
Method
Value
Value Comment
---------- ---------
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0.0(
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-------------------
MAJOR( PS SUB
BASIN (q) (BASIN
- --- ------ -----
i 78•ZI
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---------------------------------------------------
AREA
(Ac) -----CALCULATIONS
------ - - ----------------------------
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----------------------------------------------------------------------
HDI/SF-B:1989
0
RAINFALL PERFORMANCE STANDARD EVALUATION
--------------------------------
PROJECT: WESTOvRY FIRST. FILING STANDARD FORM A
COMPLETED BY: DATE:
----------------------- ----
DEVELOPEU ERODIBILITY Asb Lsb Ssb Lb Sb PS
SUMS IN ZONE - (ac) (ft) M feet I a
------------ -------------
---------------I-------
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---------------------------------------------------------
------------
IID I /- {F-A -I 9A4
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Consulting Engineers and Surveyors n�1 I
By: PI Tz Date: 6 9 Client:/ V 1G r1-t LI r\C of Sheet No. 9 of
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Consulting Engineers and Surveyors
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Consulting Engineers and Surveyors
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COLLINS, CO 80521
PH.Consulting Engineers and Surveyors
By: E/ a Date: Client: /0PI /VI i cj C Sheet No. of
Project: `,tle-s ry P UD F1 ST % I�G n
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STEWART&tSSOCIATES 10 82 93 MELDRUM, FORT COLLINS, CO 80521
PH.AX 482-9382
Consulting Engineers and Surveyors
By: P i g Date: G 6 Client: /Me i K L i h d e r Sheet No. 5 of
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Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: I Date: Client: /0p rL LI ncj N r Sheet No. of
Project: vve ss -r V!� V
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Consulting Engineers and Surveyors
By:1TZ II
Project:
Date: 4
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Subject: L/e7 r' 1 1 0h
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
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Consulting Engineers and Surveyors I
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Project: �'l/ e 5 7` > U ry ((' 1 I
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STEWART&JkSSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: Date: Client: fdo rtC L i r\ L l- Sheet No. of
Project:
Subject: L x L f I G
GROSS FE/A OF SITE' 1JgCLVDING i SHIELDS ST AQ2 I419KM0NV )KP
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Westbury P. U. D.
Page 3
The 15—inch CMP outflow pipe outflows on the east side of South Shields
Street onto the property of the Front Range Community College. An easement
has been obtained from the school districts to allow the swales and storm flows
to cross the school property. Copies of this easement and agreement are
included with this report. Most of the swale system across the school property
is already in place.
EROSION CONTROL
The Westbury P.U.D. site is located in a high rainfall erodibility zone
and in a moderate wind erodibility zone.
The 8.1—acre First Filing will be developed at this time, and the existing
vegetation will be maintained on the remainder of the site, except in the area
of sanitary sewer construction and the construction of the berm around the
detention pond. The berm will be seeded and mulched.
The concrete and paving will be installed to provide erosion protection,
and the disturbed portions of the rear yards of the lots will be seeded and
mulched.
Erosion will be controlled in the swales by placing straw bale barriers,
and a sediment trap will be placed over the detention pond outlet.
Wind erosion will be controlled by the curbs and pavement and by the
rainfall erosion control procedures.
Erosion control procedures shall comply with the City of Fort Collins
Criteria.
Westbury P.U.D.
Page 2
LOCATION AND EXISTING CONDITIONS
Westbury P.U.D. is a 24.5-acre site located in the Northeast 'I of Section
3, Township 6 North, Range 69 West, of the Sixth P.M., Fort Collins, Colorado.
The site is "L" shaped and touches West Harmony Road on the north and South
Shields Street on the east. The undeveloped Thayer property lies to the south;
and the Ridge, which is a developed subdivision of large residential lots and
open spaces, is to the west. Also to the west is a 3.1-acre single -residence
tract. The 7-acre Gress.Gallery property is located in the "L" to the east
and north.
The Pleasant Valley and Lake Canal ditch crosses the property in a
northwest to southeast direction, and development of that protion of Westbury
lying west of the ditch will require a bridged street crossing. That design
will be a part of future filings.
The existing site is covered with heavy vegetation. All that part of
the site located east of the Pleasant Valley and Lake Canal ditch, including
the offsite 3.1-acre single -residence tract, drains to an existing ponding
area located along the west side of South Shields Street at the southeast corner
of the Westbury site. The existing Shields Street roadway is raised and
provides the dike for this ponding area. Outflow from the ponding area is
under Shields Street to the east through an existing 15-inch CMP.
PROPOSED DRAINAGE
A detention pond will be constructed in the existing ponding area located
at the southeast corner of the Westbury site. The release rate from this pond
will be the 2-year historic runoff from the total 24.5-acre Westbury site,
which is calculated to be 4.4 c.f.s.
The total volume of the detention pond will not be constructed for
development of the First Filing. The pond will be sized to hold the developed
runoff from the Westbury First Filing, plus the existing undeveloped runoff
from the 3.1-acre offsite single -residence tract; plus the 10.12-acre
undeveloped portion of the Westbury site lying east of the Pleasant Valley
and Lake Canal ditch. We presume no existing flows from the west will cross
the Pleasant Valley and Lake Canal ditch. The volume required for the First
Filing pond is 62457 cubic feet.
A berm will be constructed along the north, east and south sides of the
ponding area, and the existing vegetation in the bottom of the pond will be
maintained as much as practical. The shape and size of this ponding area will
be revised as necessary when drainage design is done for future sizing.
The existing 15-inch CMP under South Shields Street will be utilized for
the outflow from this first ponding area. This outflow pipe will be extended
to the west as far as necessary to reach under the berm around the detention
pond area. A plug with a 9-inch diameter restricted opening shall be placed
in the inlet of the pond outlet pipe.
DRAINAGE AND EROSION CONTROL REPORT
WESTBURY P.U.D.
GENERAL DRAINAGE INFORMATION ABOUT SITE
1. The McClellands and Mail Creek Major Drainageway Plan applies to
this site. The site is located along the southern edge of the basin.
2. There are no major basin improvements planned in the vicinity of
the site.
3. Stormwater release rates permitted in this basin are 2—year historic
flows.
4. The upstream offsite basins consist of 4.1 acres of three (3) large
residential lots and open space in the Ridge subdivision, and of a 3.1—acre
single —residence tract. The 4.1 acres in the Ridge is existing development,
and there is a possibility the 3.1—acre tract may be developed into additional
residential lots.
5. There are no release rate restrictions on the Ridge property; and,
should the 3.1—acre tract be developed, it will require detention and will
be restricted to a 2—year historic release rate. The runoff from the Ridge
and from the existing 3.1—acre tract will be routed through the Westbury
development via sideline lot easements.
6. The Westbury development will match existing grades on adjoining
sites, and positive flow will be maintained from the adjoining sites.
7. The Pleasant Valley and Lake Canal ditch crosses the Westbury site,
and runoff from new hardsurfaced areas will be carried across the ditch on
a proposed street crossing bridge. (This bridge will be part of a future
filing.)
8. There is an existing well—defined downstream drainage leaving the
site. This drainage crosses under South Shields Street in an existing 15—inch
CMP and then flows across the Front Range Community College property in ditches
and swales to Mail Creek. An easement has been dedicated for this flow path
across the college property. The construction of the Westbury development
will not change the route or type of downstream flow, and the construction
of the Westbury detention pond will decrease the rate of flow. The overall
quantity of runoff will be increased by the additional hardsurface of
construction, but due to the slower rate of flow, downstream conditions will
not be impacted.
9. Flows from storms greater than 100—year occurence will overflow
Shields Street, but they will be accommodated by the downstream swales without
causing damage to buildings.
,,
n
STEWART&ASSOCIATES
Consulting Engineers and Surveyors
June 6, 1994
Mr. Basil Hamdan
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
Dear Basil:
The following drainage and erosion control report was prepared for Westbury
P.U.D. which is a residential development. The total area of the proposed
development is 24.5 acres, which will be developed in several filings.
This report is primarily for development of the 8.1—acre First Filing,
but we have included all necessary information about the total 24—acre site
to provide a complete drainage study.
This report complies with City of Fort Collins Storm Drainage Design
Criteria.
Sincerely,
Warn
Phillip I. Robinson, P.E. & L.S. ;��.•��G�sreWFo'*4-"
Vice President
• • Y
Jrr tr. 4502
enclosures
•�. r OF C{3` .•
James H. Stewart
and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
Ft. Collins. CO 80522
303/482-9331
Fax 303/482-9382
DRAINAGE AND EROSION CONTROL REPORT
WESTBURY P.U.D.
JUNE 6, 1994
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80521
303/482-9331
a