HomeMy WebLinkAboutDrainage Reports - 04/15/2016f
Final Drainage Summary
AUNITED CIVIL
Design Group .
Z 15 Matthews sheet Offices
Fort Collins, CO
City of Fort Collins Approved Plans
Approved by: ��� Ytt Dft�
Date: 4--1 �5 - I (o
Prepared for:
Scout Leasing, LLC
330 South College Avenue, Suite 300
Fort Collins, CO 80S24
April4, 2016
1501 Academy Ct. Ste. 203 Fort Collins, Colorado 80524 (970) 530-4044
UNITED CIVIL
Design Group mc
April 4, 2016
City of Fort Collins
Stormwater Utility
700 Wood Street
Fort Collins, Colorado 80521
RE: 215 Matthews Street Offices
Fort Collins, Colorado
Project Number: U15007
Dear Staff:
Drainage Summary
215 Matthews Street Offices
Fort Collins, CO
United Civil Design Group, LLC. is pleased to submit this Final Drainage Summary for the 215
Matthews Street Offices site in Fort Collins, Colorado. In general, this summary serves to
document the stormwater impacts associated with the proposed project.
Site Location and Project Description
The 215 Matthews Street Offices development site (referred herein as "the site") is located in
the southwest quarter of Section 12, Township 6 North, Range 69 West of the Sixth P.M., City
of Fort Collins, Larimer County, Colorado. The site consists of approximately 7,000 square -feet
(sf) and is bounded by Matthews Street on the east, a public alley on the west, and existing
multifamily residential properties to the north and south. See the attached Drainage Plan for
additional information.
The planned development for the site will consist of the following:
• The construction of multi -story, office building with a proposed footprint of
approximately 4,130 sf (5,060 sf roof footprint) with an enclosed parking garage on the
first floor.
• The construction of utilities to support the proposed building including sanitary, water
and storm drainage.
• The construction of right-of-way improvements including curb and gutter, public
sidewalk and landscaping.
Existing Conditions
Hydrology
The site, which is located within the Old Town Basin, is approximately 7,000 sf in size
and currently consists of an existing one-story residential building, gravel parking area,
and landscape areas with an existing percent -imperviousness of approximately 31%.
Storm runoff from the site currently drains towards Matthews Street where runoff is
I U14012-Drainage5ummary-Final.doc
UNITED CIVIL Drainage Summary
Design Group uc 215 Matthews Street Offices
' Fort Collins, CO
intercepted by existing curb and gutter which directs the runoff to the north to storm
' sewer inlets and piping located near Oak Street. Refer to Appendix A for additional
information.
' Floodplain
The site is not located within a FEMA or City -regulatory floodway or floodplain.
' Developed Conditions
Hydrology
The developed site will consist of approximately 6,060 square feet of impervious area
including roof, pavement and sidewalk. This is an increase of approximately 2,994
square feet of impervious area. The following table summarizes the changes of the site
from existing to proposed conditions. Refer to the Drainage Plan and Hydrology
calculations for additional information.
Comparison Summary Table
Existing Proposed
Site Site
Overall Area (sf)
7,000
7,000
Roof (so
1,321
5,060
Concrete (sf)
703
1004
Gravel (sf)
627
0
Landscape (sf)
4,349
935
Total Impervious Area (sf)
2,651
6,064
% Imperviousness
31%
78%
The drainage patterns for the proposed condition will remain largely unchanged
from existing conditions in that the vast majority of the drainage from the site will
be directed towards Matthews Street. It is anticipated that no additional drainage
' area will be directed towards the west and the public alley with the proposed
development.
Storm Sewer
The proposed improvements do not require any proposed storm sewer. The site will be
using raised bioretention planter boxes for water quality which will daylight at grade
and therefore will not require a storm sewer system. The underdrain within Planter
Box #3 (the southwest planter) is designed to drain the planter and drain the Swale
from the west side of the planter through the planter. The area draining to the west
side of planter is approximately 200 sf which corresponds to approximately 0.04 cfs in
the 100-year event. Refer to Appendix C for the culvert calculation.
2 U24012-Dralnage5ummary-Final.doc
UNITED CIVIL
Drainage Summary
A� design' Group us 21S Matthews Street Offices
' Fort Collins, CO
Swales
' The drainage design incorporates drainage swales along the north and south sides of
the site. The drainage swales were typically designed with maximum 4h:1v side slopes,
' Manning's n of 0.035, capacity to carry the 100-year flowrates plus 33%, and velocities
below 5 feet per second. Refer to Appendix C for Swale capacity calculations and the
Drainage Plan for locations of Swale sections analyzed.
' Detention and Water Quality Requirements
The proposed improvements will increase the total impervious area less than 5,000
' square feet from existing conditions; therefore, stormwater quantity detention is not
required.
' The Udall Natural Area provides water quality treatment for 50% of the site; however,
the City encourages additional water quality onsite. The development is proposing to
provide additional water quality measures in the form of bioretention planter boxes
that will collect approximately 3,815 square feet of the roof area prior to releasing to
Matthews Street.
' Low Impact Development (LID) Requirements
In February of 2013, City Council adopted the LID policy and criteria. The proposed
' development is required to meet the newly adopted criteria. Per the criteria, the site
must:
• Treat no less than 50% of any newly added impervious area using one or a
' combination of LID techniques.
• Treat no less than 25% of any newly added pavement area using a permeable
pavement.
' The following measures are being implemented with this proposed development:
Bioretention Planters
t. Basins A2-A3 and B2 (with 3,815 sf of impervious roof area) will be routed
through bioretention planter boxes that will collect roof drainage from the
' building downspouts being designed with this project. The bioretention planters
have average depths of 9-inches with an overall volume of 106 cubic feet which
exceeds the minimum design requirements for the area. Refer to the Appendix
' for additional calculations.
Permeable Pavers
Due to the small amount of added pavement not covered by roof (approximately
850 sf), and per communication with City staff, this site is not being required to
provide permeable pavers.
In total, the development is proposing to collect and treat 3,815 sf (62.9%) of the
overall 6,064 sf of impervious area developed with this project. In addition, the
3 U24022-Dralnage5ummary-final.doc
UNITED CIVIL
Drainage Summary
' Design Group LLe 215 Matthews Street Offices
Fort Collins, CO
site is also being designed with other various open landscaped areas and
vegetated swales to provide additional water quality in addition to the areas
being treated with bioretention.
Four Step Process
With the adoption of the USDCM, the City has also adopted the "Four Step Process"
' that is recommended in Volume 3 of the USDCM in selecting structural BMPs for the
redeveloping urban areas. The following portions of this summary describe each step
and how it has been utilized for this project:
1 Step 1— Employ Runoff Reduction Practices
The objective of this step is to reduce runoff peaks and volumes and to employ the
' technique of "minimizing directly connected impervious areas" (MDCIA). This project
accomplishes this by:
' • Routing roof flows through bioretention planter boxes and through vegetated
swales to increase time of concentration, promote infiltration and provide
water quality.
Step 2 — Provide Water Quality Capture Volume (WQCV)
The objective of providing WQCV is to reduce the sediment load and other pollutants
that exit the site. For this project WQCV is provided within the Udall Natural Area, so
' no additional WQCV is required. However, the development is providing bioretention
planter boxes; and therefore, additional WQCV in order to satisfy the LID requirements.
Step 3 — Stabilize Drainageways
' The site is not adjacent or near a major drainageway; however, this project will pay
stormwater development and stormwater utility fees which the City uses, in part, to
' maintain the stability of the City drainageway systems.
Step 4 — Consider Need for Industrial and Commercial BMPs
This step is generally considered for industrial and commercial sites. As this
' development is proposing a small office building, no specialized BMPs have been
considered for this project.
' Standard Operating Procedures (SOPS)
In order for physical stormwater Best Management Practices (BMPs) to be effective,
proper maintenance is essential. Maintenance includes both routinely scheduled
' activities, as well as non -routine repairs that may be required after large storms, or as a
result of other unforeseen problems. Standard Operating Procedures should clearly
identify BMP maintenance responsibility.
' Identifying who is responsible for maintenance of BMPs and ensuring that an adequate
' budget is allocated for maintenance is critical to the long-term success of BMPs.
Maintenance responsibility may be assigned either publicly or privately. For this
project, the privately owned BMPs including the bioretention planters and vegetated
4 U14012-DrainageSummary-Final.doc
AUNITED CIVIL Drainage Summary
� Design Group uc 215 Matthews Street Offices
Fort Collins, CO
swales are to be maintained by the property owner, homeowner's association (HOA), or
property manager.
Erosion Control
' Erosion control, both temporary and permanent, is a vital part of any development project.
For this project, the site disturbance will be less than 10,000 sf; therefore, comprehensive
' erosion control measures have been included within the Grading and Erosion Control Plan for
the project. Refer to the Utility Plans, under separate cover, for additional information.
Conclusions
In conclusion, the drainage system proposed within this Drainage Summary provides adequate
conveyance of the developed stormwater runoff from the proposed development to existing
discharge locations and drainage systems. It should also be noted that with this summary and
the corresponding design, every attempt has been made to minimize any negative impacts on
the downstream receiving waters. With the incorporation of the LID techniques, the site will
discharge a lower sediment load and less runoff.
We understand that review by the City of Fort Collins is to assure general compliance with
standardized criteria contained in the Fort Collins Stormwater Criteria Manual (FCSCM). This
summary was prepared in compliance with technical criteria set forth in both the Urban
Drainage and Flood Control District (UDFCD) Urban Storm Drainage Criteria Manual and the.
FCSCM.
If you should have any questions or comments as you review this drainage summary, please
feel free to contact us at your convenience.
Sincerely,
Unitedooved Civil Design Group, LLC
".4
Kevin Brazelton, PE
Engineering Manager
APPENDICES
APPENDIX A - Hydrology Computations
APPENDIX B - LID Calculations
APPENDIX C - Hydraulic Calculations
APPENDIX D — Referenced Material
APPENDIX E - Drainage Plan
5 U14012-Drainage5ummary-FinalAm
APPENDIX A
Hydrology Calculations
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APPENDIX B
LID Calculations
' 215 Matthews Street Offices Water quality UNITED CIVIL
Fort Collins, Colorado ANNDesign Group
Low Impact Development (LID) Treatment Areas
Basin
Proposed
Impervious
Area
(sf)
LID Treatment
Area
Treated (sf)
% of Site
Treated
Individual Basins
Basin Al
499
None
0
0%
Basin A2
1,284
Bioretention
1,284
21%
Basin A3
1,259
Bioretention
1,259
21%
Basin B1
505
None
0
0%
Basin B2
1,272
Bioretention
1,272
21%
Basin 63
1,245
None
0
0%
Total Site
6,064
3,815
1 63%
Calculations by: KR8
Date: 111812016 C: J United Civill Dropbox�Projects 1 U15007 - 215 Mathews I Drainage �Hydrology] U15007-Runoff.xlsx
Design Procedure Form: Rain Garden (RG)
Sheet 1 of 2
Designor. KRB
Company:
United Civil Design Group
Date:
October 14. 2015
Project:
215 Matthews Street
Location:
Fort Collins
1. Basin Storage Volume
A) Effective Imperviousness of Tributary Area. I,
I, =
90.0
%
(100% 0 all paved and roofed areas upstream of rain garden)
B) Tributary Area's Imperviousness Ratio (i = I,/100)
=
0.900
C) Water Quality Capture Volume (WQCV) for a 12-hour Drain Time
WQCV =
0.32
watershed inches
(WQCV= 0.8 - (0.91• 13- 1.19' i2+ 0.78 - 1)
D) Contributing Watershed Area (including rain garden area)
Area =
3.815
sq ft
E) Water Quality Capture Volume (WQCV) Design Volume
Vwocv =
102
cu it
Vol = (WQCV / 12)' Area
F) For Watersheds Outside of the Denver Region, Depth of
de =
in
Average Runoff Producing Storm
G) For Watersheds Outside of the Denver Region.
VwOCV OTHER =
cu it
Water Quality Capture volume (WOCV) Design volume
H) User Input of Water Quality Capture Volume (WQCV) Design Volume
VWOOV USER -
cu ft
(Only if a different WQCV Design Volume is desired)
2. Basin Geometry
A) WQCV Depth 02-inch maximum)
Dwocv =
9
in
B) Rain Garden Side Slopes (Z - 4 min., hortz. dist per unit vertical)
Z =
0.00
ft / ft
(Use "0" if rain garden has vertical walls)
C) Mimimum Flat Surface Area
Am„ -
68
sq ft
D) Actual Flat Surface Area
A, .j =
141
sq ft
E) Area at Design Depth (Top Surface Area)
AT.. =
141
sq ft
F) Rain Garden Total Volume
VT-
106
cu ft
(VT- ((AT. ` A�) / 2) ' Depth)
3. Growing Media
Choose One
n 18" Rain
Garden Growing Media
Q Other (Explain):
4. Underdrain System
— Qlpnse tyre
* YES
A) Are underdmins provided?
p NO
B) Underdrain system orifice diameter for 12 hour drain time
i) Distance From Lowest Elevation of the Storage
y=
it
Volume to the Center of the Orifice
ii) Volume to Drain in 12 Hours
Vol,, -
NIA
cu it
id) Orifice Diameter, 3/8" Minimum
Du =
NIA
in
1,10-BMP_0.03.xism, RG 10/14/2015, 301 PM
Design Procedure Form: Rain Garden (RG)
Sheet 2 of 2
Designer: KRB
Company: United Civil Design Group
Date: October 14, 2015
Project: 215 Matthews Street
Location: Fort Collins
5. Impermeable Geomembmne Liner and Geolextile Separator Fabric
— Choose r»e —
(D YES
A) Is an impermeable liner provided due to proximity
Q NO
01 structures or groundwater contamination?
6. Inlet l Outlet Control
Choose One--
Q Sheet Flow- No Energy Olsslpatlan Required
A) Inlet Control
Q Concentrated Flow- Energy Disslpadon Provided
— C7xr+ae Lbm .
7. Vegetation
Q Seed (Plan For frequent weed Control)
QQ Plantings
Q Sand Grown or Other High Infiltration Sod
8. Imgation
Choose One
Q YES
A) Will the ram garden be imgated7
NO
Notes
II UD-BMP_v3.03.x1sm, RG 10l1412015, 3:01 PM
APPENDIX C
Hydraulic Calculations
Culvert Report
'
Hydraf low Express Extension for Autodesk®AutoCAD® Civil 3D® by Autodesk, Inc.
Monday, Jan 18 201
Planter #3 Underdrain
Invert Elev Dn (ft) =
81.26
Calculations
Pipe Length (ft) =
10.83
Qmin (cfs)
= 0.04
'Slope
(%) =
1.48
Qmax (cfs)
= 0.19
Invert Elev Up (ft) =
81.42
Tailwater Elev (ft)
_ (dc+D)/2
Rise (in) =
6.0
'
Shape =
Circular
Highlighted
Span (in) =
6.0
Qtotal (cfs)
= 0.04
No. Barrels =
1
Qpipe (cfs)
= 0.04
'
n-Value =
0.012
Qovertop (cfs)
= 0.00
Culvert Type =
Circular Concrete
Veloc Dn (ft/s)
= 0.33
Entrance =
Square edge w/headwall (C)
Veloc Up (ft/s)
= 0.99
'Culvert
Coeff. K,M,c,Y,k =
0.0098, 2, 0.0398, 0.67, 0.5
HGL Dn (ft)
= 81,56
HGL Up (ft)
= 81.55
'Embankment
Top Elevation (ft) =
83.60
Hw Elev (ft)
Hw/D (ft)
= 81.57
= 0.31
Top Width (ft) =
10.50
Flow Regime
= Outlet Control
'
Crest Width (ft) =
6.00
'he underdrain within Planter Box #3 will also drain approximately 200 s
lest of the planter (or approximately 21% of Basin Al). The calculation
> based on 21 % of the total flowrate of Basin Al during the 100-year
!vent.
II
�J
I Channel Report
' Hydraf low Express Extension for Autodesk®AutoCAD® Civil 3D® by Autodesk, Inc
North Swale
' User -defined Highlighted
Invert Elev (ft) = 79.24 Depth (ft)
'Slope (%) = 1.45 Q (cfs)
N-Value = 0.035 Area (sqft)
Velocity (ft/s)
'Calculations Wetted Perim (ft)
Compute by: Known Q Crit Depth, Yc (ft)
Known Q (cfs) = 1.01 Top Width (ft)
' EGL (ft)
(Sta, El, n)-(Sta, El, n)...
( 0,00, 79,89) -(0 65, 79.89, 0,025)-(3.53, 79.24, 0.035)-(5.35, 79.75, 0.035)-(8.13, 79.80, 0.025)
Flowrate includes all of Basin B 100-year flowrates plus
' an additional 33% per Fort Collins addendum to Urban
Drainage Section 4.1.1.5.
' Elev (ft) Section
t
1
-I V 1 L 3 4 O O
t Sta (ft)
= 0.39
= 1.010
= 0.61
= 1.66
= 3.22
= 0.34
= 3.12
= 0.43
O O
Monday, Jan 18 201
Depth (ft)
0.76
0.51
0.26
-0.24
Channel Report
' Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3138 by Autodesk, Inc
South Swale
User -defined Highlighted
Invert Elev (ft) = 79.35 Depth (ft)
'Slope (%) = 1.00 Q (Cfs)
N-Value = 0.025 Area (sqft)
Velocity (ft/s)
'Calculations Wetted Perim (ft)
Compute by: Known Q Crit Depth, Yc (ft)
Known Q (cfs) = 1.24 Top Width (ft)
' EGL (ft)
(Sta, El, n)-(Sta, El, n)...
( 0.00, 80.02)-(1.98, 80.02, 0.025)-(3.82, 79.35, 0,025)-(6.82, 80.21, 0.025)-(8.13, 80.20, 0.025)
' IFlowrate includes all of Basin A and Basin OS1 100-
�year flowrates plus an additional 33% per Fort Collins
laddendum to Urban Drainage Section 4.1.1.5.
Elev (ft)
Section
78.50 '
1 0 1 2 3 4
' Sta (ft)
Thursday, Jan 28 2016
= 0.44
= 1.240
= 0.60
= 2.05
= 2.88
= 0.40
= 2.74
= 0.51
5 6 7 8 9 10
Depth (ft)
1.65
1.15
0.65
0.15
-0.35
WIVY
APPENDIX D
Referenced Material
USDA United States
Department of
Agriculture
MRCS
Natural
Resources
Conservation
Service
A product of the National
Cooperative Soil Survey,
a joint effort of the United
States Department of
Agriculture and other
Federal agencies, State
agencies including the
Agricultural Experiment
Stations, and local
participants
Custom Soil Resource
Report for
Larimer County
Area, Colorado
215 Matthews Street
May 14, 2015
No Text
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Custom Soil Resource Report
Map Unit Legend
Larlmer County Area, Colorado (C0644)
Map Unit Symbol
Map Unit Name
Acres In A01
Percent of A01
35
Fort Collins loam, 0 to 3 percent
slopes
7.6
25.3%
94
Satanta loam, 0 to 1 percent
slopes
22.4
74.7%
Totals for Area of Interest
30.0
100.0%
Map Unit Descriptions
The map units delineated on the detailed soil maps in a soil survey represent the soils
or miscellaneous areas in the survey area. The map unit descriptions, along with the
maps, can be used to determine the composition and properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits for the properties of the soils. On the landscape,
however, the soils are natural phenomena, and they have the characteristic variability
of all natural phenomena. Thus, the range of some observed properties may extend
beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic
class rarely, if ever, can be mapped without including areas of other taxonomic
classes. Consequently, every map unit is made up of the soils or miscellaneous areas
for which it is named and some minor components that belong to taxonomic classes
other than those of the major soils.
Most minor soils have properties similar to those of the dominant soil or soils in the
map unit, and thus they do not affect use and management. These are called
noncontrasting, or similar, components. They may or may not be mentioned in a
particular map unit description. Other minor components, however, have properties
and behavioral characteristics divergent enough to affect use or to require different
management. These are called contrasting, or dissimilar, components. They generally
are in small areas and could not be mapped separately because of the scale used.
Some small areas of strongly contrasting soils or miscellaneous areas are identified
by a special symbol on the maps. If included in the database for a given area, the
contrasting minor components are identified in the map unit descriptions along with
some characteristics of each. A few areas of minor components may not have been
observed, and consequently they are not mentioned in the descriptions, especially
where the pattern was so complex that it was impractical to make enough observations
to identify all the soils and miscellaneous areas on the landscape.
The presence of minor components in a map unit in no way diminishes the usefulness
or accuracy of the data. The objective of mapping is not to delineate pure taxonomic
classes but rather to separate the landscape into landforms or landform segments that
have similar use and management requirements. The delineation of such segments
on the map provides sufficient information for the development of resource plans. If
10
Custom Soil Resource Report
intensive use of small areas is planned, however, onsite investigation is needed to
define and locate the soils and miscellaneous areas.
An identifying symbol precedes the map unit name in the map unit descriptions. Each
description includes general facts about the unit and gives important soil properties
and qualities.
' Soils that have profiles that are almost alike make up a soil series. Except for
differences in texture of the surface layer, all the soils of a series have major horizons
that are similar in composition, thickness, and arrangement.
' Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity,
degree of erosion, and other characteristics that affect their use. On the basis of such
differences, a soil series is divided into soil phases. Most of the areas shown on the
' detailed soil maps are phases of soil series. The name of a soil phase commonly
indicates a feature that affects use or management. For example, Alpha silt loam, 0
to 2 percent slopes, is a phase of the Alpha series.
' Some map units are made up of two or more major soils or miscellaneous areas.
These map units are complexes, associations, or undifferentiated groups.
' A complex consists of two or more soils or miscellaneous areas in such an intricate
pattern or in such small areas that they cannot be shown separately on the maps. The
pattern and proportion of the soils or miscellaneous areas are somewhat similar in all
areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example.
' An association is made up of two or more geographically associated soils or
miscellaneous areas that are shown as one unit on the maps. Because of present or
anticipated uses of the map units in the survey area, it was not considered practical
or necessary to map the soils or miscellaneous areas separately. The pattern and
relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha -
Beta association, 0 to 2 percent slopes, is an example.
' An undifferentiated group is made up of two or more soils or miscellaneous areas that
could be mapped individually but are mapped as one unit because similar
interpretations can be made for use and management. The pattern and proportion of
' the soils or miscellaneous areas in a mapped area are not uniform. An area can be
made up of only one of the major soils or miscellaneous areas, or it can be made up
of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example.
' Some surveys include miscellaneous areas. Such areas have little or no soil material
and support little or no vegetation. Rock outcrop is an example.
11
' Custom Soil Resource Report
' Larimer County Area, Colorado
t35—Fort Collins loam, 0 to 3 percent slopes
Map Unit Setting
' National map unit symbol. 2tlnc
Elevation: 4,020 to 6,730 feet
Mean annual precipitation: 14 to 16 inches
' Mean annual air temperature: 46 to 48 degrees F
Frost -free period. 143 to 154 days
Farmland classification: Prime farmland if irrigated
' Map Unit Composition
Fort collins and similar soils: 85 percent
Estimates are based on observations, descriptions, and transacts of the mapunit.
' Description of Fort Collins
Setting
' Landform: Interfluves
Down -slope shape: Linear
Across -slope shape: Linear
' Parent material: Pleistocene or older alluvium derived from igneous, metamorphic
and sedimentary rock and/or eolian deposits
Typical profile
Ap - 0 to 4 inches: loam
Bt1 - 4 to 9 inches: clay loam
Bt2 - 9 to 16 inches: clay loam
Bk1 - 16 to 29 inches: loam
Bk2 - 29 to 80 inches: loam
Properties and qualities
Slope: 0 to 3 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high
(0.20 to 2.00 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding. None
Calcium carbonate, maximum in profile: 12 percent
Salinity, maximum in profile: Nonsaline (0.1 to 1.0 mmhos/cm)
Sodium adsorption ratio, maximum in profile: 0.5
Available water storage in profile: High (about 9.1 inches)
Interpretive groups
Land capability classification (irrigated): 2e
Land capability classification (nonirrigated): 4c
Hydrologic Soil Group: C
Ecological site: Loamy plains (R067BY002CO)
12
Custom Soil Resource Report
1
94--Satanta loam, 0 to 1 percent slopes
Map Unit Setting
National map unit symbol. jpyc
Elevation: 4,800 to 5,600 feet
Mean annual precipitation: 13 to 15 inches
Mean annual air temperature: 48 to 50 degrees F
Frost -free period. 135 to 150 days
Farmland classification: Prime farmland if irrigated
Map Unit Composition
Satanta and similar soils: 85 percent
Estimates are based on observations, descriptions, and transacts of the mapunit.
Description of Satanta
Setting
Landform: Terraces
Landform position (three-dimensional): Side slope, tread
Down -slope shape: Linear
Across -slope shape: Linear
Parent material. Mixed alluvium and/or eolian deposits
Typical profile
H1 - 0 to 12 inches: loam
H2 - 12 to 18 inches: loam, clay loam, sandy clay loam
H2 - 12 to 18 inches: loam, clay loam, fine sandy loam
H2 - 12 to 18 inches:
H3 - 18 to 60 inches:
H3 - 18 to 60 inches:
H3 - 18 to 60 inches:
Properties and qualities
Slope: 0 to 1 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high
(0.60 to 2.00 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum in profile: 10 percent
Available water storage in profile: Very high (about 26.4 inches)
Interpretive groups
Land capability classification (irrigated): 1
Land capability classification (nonirrigated): 3c
Hydrologic Soil Group: B
13
GEOTECHNICAL SUBSURFACE EXPLORATION REPORT
' PROPOSED OFFICE BUILDING
215 MATTHEWS STREET
FORT COLLINS, COLORADO
Prepared By:
SOILOGIC, Inc.
Job Number: 15-1056
April 7, 2015
SOj LOGIC
Geotechnical Subsurface Exploration Report
Proposed Office Building
215 Matthews Street
Fort Collins, Colorado
Soilogic # 15-1056
10
order to maintain flooring product manufacturer warranties. A vapor barrier would help
reduce the transmission of moisture through the floor slabs. However, the unilateral
moisture release caused by placing concrete on an impermeable surface can increase slab
curl. The amount of slab curl can be reduced by careful selection of an appropriate
concrete mix. Slab curl cannot be eliminated. We recommend the owner, architect and
flooring contractor consider the performance of the slabs in conjunction with the
proposed flooring products to help determine if a vapor barrier will be required and
where best to position the vapor barrier in relation to the floor slab. Additional guidance
and recommendations concerning slab -on -grade design can be found in American
Concrete Institute (ACI) section 302.
Pavements Subgrades
At this time, we understand permeable pavements may be utilized for the site drive
and/or parking areas. Permeable pavement subgrades should be developed as outlined in
the "Foundation Bearing and Site Development" portion of this report. Care should be
taken to avoid densification of permeable pavement subgrade soils prior to placement of
the overlying system.
To complete the percolation test for aid in the design, three (3) eight -inch diameter and
36-inch deep percolation test holes were completed at each deep boring location. An
average percolation rate of 57 minutes per inch was established in the near surface site
soils and could be used in design.
With the recommended overexcavation/backfill procedures to develop finish foundation
bearing levels for the proposed building, it is our opinion a Partial of Full -Infiltration
section could be used for this site. The near surface site lean clay is fine graded, such that
a filter fabric should be employed at the clay/filter media interface.
Minimum light and heavy-duty structural permeable pavement section designs are
outlined below in Table I.
Geotechnical Subsurface Exploration Report
Proposed Office Building
215 Matthews Street
Fort Collins, Colorado
Soilogic # 15-1056
11
Table I —Permeable Pavement Section Design
Classification
Light -Duty
Heavy -Duty
Roadway
Private Drive/Parking
Private Drive/Parking
Design Structural Number
(2.42)
(3.08)
Option A — Permeable Pavement
Surface Paver (SF Rima)
3.15" (0.40/inch)
3.15" (0.40/inch)
Storage Media
*6" (0.11/inch)
*I I" (0.11/inch)
Filter Media
6" (0.11/inch)
6" (0.11/inch)
(Structural Number)
(2.58)
(3.13)
* The storage media thickness outlined above is from a structural support
perspective only for light -duty pavements. Greater thicknesses may be required
based on storage water calculations and minimum requirements provided by the
system manufacturer.
Light -duty pavements could be considered for light vehicle parking areas. Heavy-
duty pavements should be considered for access drives and other areas of the site
expected to receive heavy trash or delivery truck traffic. We recommend
permeable pavement filter and storage media be adjusted to a workable moisture
content and compacted to at least 75% of the material's relative density.
Corrosive Soil Characteristics
Water-soluble sulfates (WSS) tests were completed on two (2) selected soil samples
obtained from the site to help evaluate corrosive soil characteristics with respect to buried
concrete. A corrosive soil characteristics outline is included with this report. The WSS
tests fall within the "negligible" and "moderate" classification with respect to the severity
of the sulfate environment. Type II cement should be used for project concrete exposed
to soils with a "moderate" classification. If Type II cement is not available, care should
be taken to thoroughly consolidate concrete exposed to the site soils. A maximum
water/cement ratio of 0.50 is recommended for "moderate" severity. In addition,
consideration could be given to utilizing air -entrained concrete exposed to the site soils,
APPENDIX E
Drainage Plan
N LOLSSO,. I' OI
ENDED
REDERFAME
ON."'IGI ONE
NORTI SYW1E SECIFONR
CEF.DN"ImI0Ea
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LEGEND
ER
EMnI� «MaEh
a sn R.
7—r-T\ N
--
EN�NG. VEMENTS,RINI
asn:oa .aBNER
UNITED CIVIL
N—
BOOSTING FENCE
A DISTINGELELTIC
Design Group
EXISTING BUILDERS
m— ELI GVERHFAO ELECTRIC
EASONG PROPEWY LINE
FASTING CABLE
EFUME
Civil Engineering a
cOTBanisg
ME
UNITS OF DISTURBANCE
- —J0102 -
PASTING CONTOUR
PrroPosEDCOMMUR
1502 Acetlamy C1.
X
B.dw ceslcGAnox
BtB. 2➢3
Fort Collins, CO 80524
zIa
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(910) 530d044
F C
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BURUN,EAIACREI
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NOTES
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DRAINAGE SUMMARY
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095
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0.28
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0.39
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0.04
0.28
City of
Fort Collins, Colorado
UTILITY
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