HomeMy WebLinkAboutFile Documents.210 S West End St.0111.2019 (18).ARBK
www.sgm-inc.com
GLENWOOD SPRINGS 118 West Sixth St, Suite 200 | Glenwood Springs, CO 81601 | 970.945.1004
Page | 1
August 30, 2022
210 S West End Street
Aspen, Colorado 81611
RE: 210 S West End Street, Parcel 2737-182-06-004
As-Built Drainage Memo
Dear City of Aspen Engineering:
This memo addresses Civil Engineering aspects of the proposed project at 210 S West End Street in the
City of Aspen and is intended to be verification for the project with the City of Aspen Engineering
Department. The drainage BMPs were reviewed on site on August 25th, 2022. Additional verification was
provided by verifying grades on the site as discovered by Peak Surveying, Inc. on August 26th, 2022. Drain
inlets, drain outlets, cleanouts, rain gardens, and overflow weirs were observed to be installed per the civil
permit plans dated August 4, 2021. The only noticeable difference to the civil permit plans is that the upper
rain garden was modified to hold 14 cubic feet of storm water (designed to 20 cubic feet) and the lower
rain garden was modified to hold 23 cubic feet of storm water (designed to 17 cubic feet). An overflow
weir and weep holes were installed to route water to the lower rain garden. However, the combined volume
of storm water storage between the original design and what was installed in the field, remains up to the
design and drainage standards at 37 cubic feet of storm water storage.
We hope this memo is enough for the as-built drainage approval for the development of this site. Please
feel free to contact us if we may provide further information or clarification.
Respectfully,
Rick L Barth, P.E.
Senior Engineer
Civil Services Sector
SGM
CITY OF ASPEN DRAINAGE MAINTENANCE PLAN
210 S WEST END
ASPEN, CO 81611
I hereby affirm that this report and the accompanying drawings for the analysis of 210 S
West End Drive, Aspen, Colorado was prepared under my direct supervision for the owners
thereof in accordance with the provisions of the City of Aspen Urban Runoff Management
Plan with proposed variances and exceptions listed thereto. I understand that it is the policy
of the City of Aspen that the City of Aspen does not and will not assume liability for drainage
facilities designed by others.
Permit #: 0011-2021-BCHO
August 04, 2021
Rick Barth, P.E. 36749
Prepared by
118 West Sixth Street, Suite 200
Glenwood Springs, CO 81601
970.945.1004
970.945.5948 fax
210 S West End, Aspen, Colorado August 30, 2022
Drainage Report for Major Design i
CITY OF ASPEN DRAINAGE MAINTENANCE PLAN
210 S WEST END
ASPEN, CO 81611
REVIEWED BY
RICK BARTH
SGM Project # 2020-474.001
I:\2020\2020-474-SackResidenceRenovation\001\E-Reports\SGM\Ops & Maintenance\210
S West End Maintenance Plan.docx
210 S West End, Aspen, Colorado August 30, 2022
Drainage Report for Major Design ii
TABLE OF CONTENTS
1.0 Existing Site 3
1.1 Description of Existing Site 3
1.2 Description of Existing Drainage 3
2.0 Proposed Project 3
3.0 Proposed Basins 4
3.1 Basin 1 4
3.2 Basin 2 4
3.3 Basin 3 4
3.4 Basin 4 5
3.5 Basin 5 5
3.6 Basin 6 5
4.0 Peak Flow Methodology 5
5.0 Water Quality Methodology 6
6.0 Maintenance 6
6.1 Pervious Pavers 6
6.2 Rain Garden 6
6.3 Dry well (Flo-Well) 8
7.0 Conclusion 8
LIST OF APPENDICES
Appendix A – Proposed Drainage Schematic & Tree Canopy Credits
Appendix B – Water Quality Capture Volume Calculations
Appendix C – Peak Flow Calculations – Proposed Conditions
Appendix D – Soil Study
210 S West End, Aspen, Colorado August 30, 2022
Drainage Report for Major Design 3
1.0 Existing Site
1.1 Description of Existing Site
The physical address of the project is 210 S West End, Aspen, Colorado and it is located on
parcel no. 2737-182-06-004. This parcel is approximately 9000 square feet and is owned by
West End Home LLC. The existing structure on the parcel is one building that serves as a
multi-unit (4-8). The project focuses on landscaping and entrance improvements and
changes to the inside and the addition of roof and balcony aspects while preserving access,
utilities, and most existing vegetation . The existing residence is 7602 square feet and has
three stories with a garage.
1.2 Description of Existing Drainage
Existing storm water runs off the existing house either as sheet flow or through gutters and
downspouts. Topography of the site suggests that the existing drainage patterns flow from
the east side of the property to the west side of the property. Some drainage moves north
and south but ultimately flows west once it reaches the gutter and alley. A previously
designed flo-well detention system was installed in the fall of 2020 and will be incorporated
into the design of the major classification project. There are no apparent erosive or runoff
issues (gullies, channels, etc.).
A web soil survey was performed and found the soils to be Uracca, moist -Mergel complex,
classified as Hydrologic Soil Group B will well-draining soils consisting of very cobbly sandy
clay loam to extremely cobbly loamy sand.
There is no existing offsite runoff that enters the property as upstream flows appear to be
properly directed to the CoA stormwater infrastructure . The property will not require
detention beyond the water quality capture volume (WQCV) as it exists within the City of
Aspen and can rely on the city’s stormwater infrastructure .
2.0 Proposed Project
The primary purpose of this project is to remodel the existing residence. Other
improvements include the addition of onsite snowmelt pavement and improving storm water
runoff quality. The proposed project is considered a major project as defined by the COA
Urban Runoff Management Plan (URMP) because more than 1000 square feet and 25% of
the site will be disturbed.
The proposed residential remodel will affect the main level, basement, and upper level.
Storm water quality improvements consist of 838 square feet of pervious pavers and 55.3
cubic feet of rain gardens. The pervious pavers will be located on the patios and walkways
around the property. Rain gardens are located on the west of the residence.
210 S West End, Aspen, Colorado August 30, 2022
Drainage Report for Major Design 4
3.0 Proposed Basins
The proposed site has 6 basins, as shown in Appendix A. Summary of the basins and
detailed calculations can be found in Appendix B. Storm water runoff will be routed to
designated BMPs for water quality treatment through a combination of grading and gutters
with downspouts. All proposed storm water runoff will discharge from the site as sheet flow
in a westerly direction to match historical flow patterns. Basins are detailed in the sections
that follow, with descriptions on how the required WQCV is treated by BMPs within the
basin. WQCV is calculated based on tree canopy credits, proposed rain garden volume, and
proposed pervious paver area.
3.1 Basin 1
Basin 1 is located on the northeast corner of the site, along the alley. This basin is 1571
square feet of which 1312 square feet is impervious. A 12.6 cubic foot flo-well detention with
4.7 cubic feet of aggregate volume (gravel) will be used to treat the WQCV for this basin.
This flo-well was designed by another engineering firm when the project was currently in a
Minor Development category. Grades were adjusted to better fit the overall grading scheme
and an overflow pipe was added to the design, directing wate r further downstream to Basin
6. See Appendix A for the proposed location of BMPs in this basin. This area is mostly the
north-eastern portion of the building and roof. Storm water will be routed from the roof and
driveway to the flo-well via roof drainage, gutter downspouts, and a trench drain in front of
the garage. Water infiltrates within the flo-well detention and an overflow pipe is connected
to direct excess water to a secondary flo-well in Basin 6. The need for the overflow and
second flo-well derives from the garage apron and driveway being in a sump condition.
Previous designs for the flo-well had the overflow directing back to the trench drains,
creating a circular flow path with no overflow route away from this basin.
3.2 Basin 2
Basin 2 is located on the eastern portion of the site. Storm water runoff will flow from roof
areas toward the east property boundary and ultimately west by means of an underdrain.
This basin is 1032 square feet of which 828 square feet is impervious. Pervious pavers will
be used to treat the WQCV, with remaining WQCV being treated by the rain gardens on the
west of the site. See Appendix A for the proposed location of BMPs in this ba sin. After water
infiltrates through the pavers and respective substrate, it enters the underdrain and is
directed to the rain garden.
3.3 Basin 3
Basin 3 is located on the southeast side of the site and will collect runoff from the southeast
portion of the roof. Storm water runoff will flow from roof areas toward the south property
boundary and ultimately west by means of an underdrain. This basin is 1688 square feet of
which 821 square feet is impervious. Pervious pavers will be used to treat the WQCV, with
remaining WQCV being treated by the rain gardens on the west of the site. See Appendix A
for the proposed location of BMPs in this basin. After water infiltrates through the paver s and
respective substrate, it enters the underdrain and is directed to the rain garden.
210 S West End, Aspen, Colorado August 30, 2022
Drainage Report for Major Design 5
3.4 Basin 4
Basin 4 is located on the southwest side of the site and will collect runoff from the southwest
portion of the roof. Storm water runoff will flow from roof areas toward the south property
boundary and ultimately west by means of an underdrain. This basin is 2132 square feet of
which 709 square feet is impervious. Pervious pavers will be used to treat the WQCV, with
remaining WQCV being treated by the rain gardens on the west of the site. See Appendix A
for the proposed location of BMPs in this basin. After water infiltrates through the pavers and
respective substrate, it enters the underdrain and is directed to the rain garden.
3.5 Basin 5
Basin 5 is located on the west side of the site and will collect runoff from the west portion of
the roof. Storm water runoff will flow from roof areas toward the west property boundary by
means of surface flow and an underdrain This basin is 1516 square feet of which 829
square feet is impervious. Pervious pavers will be used to treat the WQCV, with remaining
WQCV being treated by the rain gardens on the west of the site. See Appendix A for the
proposed location of BMPs in this basin. After water infiltrates through the pa vers and
respective substrate, it enters the underdrain and is directed to the rain garden.
3.6 Basin 6
Basin 6 is located on the northwest side of the site and will collect runoff from the northwest
portion of the roof. Storm water runoff will flow from roof areas toward the south by means of
gutter and surface flow. This basin is 1061 square feet of which 676 square feet is
impervious. Pervious pavers will be used to treat the WQCV, with remaining WQCV being
treated by the rain gardens on the west of the site. See Appendix A for the proposed
location of BMPs in this basin. After water infiltrates through the pavers and respective
substrate, it enters the underdrain and is directed to the rain garden.
4.0 Peak Flow Methodology
Peak flow methodology was not a determining factor for this site since all stormwater will be
treated for water quality and ultimately ending up in the City of Aspen stormwater
infrastructure. Pipe sizes were calculated to ensure they are sized appropriately to convey
the 100-year storm water. These sizing calculations can be seen below.
210 S West End, Aspen, Colorado August 30, 2022
Drainage Report for Major Design 6
5.0 Water Quality Methodology
The Required WQCV (cf) for each basin on the property was estimated from Figure 8.13 of
the URMP based on the basin imperviousness and basin area. Then WQCV credits were
estimated based on the proposed areas for pervious pavers and preserved tree canopy (see
further discussion of tree canopy credit below). All water quality treatment is based on the
instruction of section 8.4.1 in the URMP
The Tree Canopy Credit was calculated following the recommendations in section 8.4.1 of
the URMP. Detailed calculations for the Tree Canopy Credit can be found in Appendix C. In
addition, a map showing the designated trees and their canopy areas is shown in Appendix
B. Runoff from all impervious areas will be treated by directing the runoff to pervious pavers
and a rain garden. All proposed runoff will leave the property as sheet flow and will flow over
grass lawn located in the right of way before entering the curb and gutter system.
6.0 Maintenance
6.1 Pervious Pavers
The following maintenance recommendations were found in the Urban Drainage Flood Control
District USDCM: Volume 3 Storm water Quality (page 6-15 to 6-17) and will be used as a guide
for the maintenance of the proposed pervious pavers. An inspection of the condition and
observation of infiltration should be completed annually. The paver s will lose infiltration
capabilities over time and it is recommended to use ASTM C1707 Standard Test Method for
Infiltration Rate of In Place Pervious Concrete to measure the infiltration rate of the pavers. A
regenerative air or vacuumed sweeper should be used twice annually and after any significant
site work, like landscaping, is done. However, the timing of vacuum sweeping is variable based
on site conditions and biannual vacuuming may be more often than needed. Sand should never
be applied to the pave rs for snow removal as this will decrease the permeability of the pavers.
The proposed pavers will ha ve snowmelt capabilities, but if snow removal is necessary,
mechanical snow removal should be done. If the surface of the paver system ever become s
completely clogged, remove and replacement of the first ½ to 1 inch of infill. The use of a push
broom is recommended for the replacement of infill.
6.2 Rain Garden
Annual inspection of the rain gardens should be taken to ensure that the material is not clogged
and inhibiting drainage. Inspection after large storms should also be taken to ensure that the
rain garden is draining as it should. Replacement and/or cleaning of the material should be
performed when it is observed that the rain garden is performing less tha n optimally in its
210 S West End, Aspen, Colorado August 30, 2022
Drainage Report for Major Design 7
existing condition. Cleaning of the underdrain should be inspected annually and after large
storms that could cause debris to clog the pipes. Cleanouts have been provided to facilitate this
maintenance.
The following maintenance recommendations were found in the Urban Drain age Flood Control
District USDCM: Volume 3 Stormwater Quality (page 6 -5 to 6-7) and will be used as a guide for
the maintenance of the proposed facilities. Grass buffers and rain gardens should be inspected
at least twice a year for cover and vehicle impacts. Trash and debris should be removed from
the buffer at least twice a year. The buffer should be aerated once a year with holes of 2 inches
in depth and no more than four inches apart. When aerating the buffer, sprinkler heads and
shallow utilities should be marked to ensure they are not damaged. It is recommended to mow
only when weeds need to be removed in the first 3 years. After the first 3 years the grass
should be maintained at 6 inches or more in height. If grass buffers and rain gardens are no
longer holding storm flows or are not draining in 24 hours, immediate maintenance is required.
When drainage overflows to areas not intended to detain or convey flows immediate
maintenance is required. Additional information on mowing the grass buffer is prov ided in
Figure 1. Irrigation is recommended to maintain a healthy vegetation cover. In the early
summer and fall, irrigation is typically needed less, but in July and August more irrigation is
needed. If native grasses are used, irrigation should not be ne eded after establishment but
could be useful during long dry periods. Although irrigation is necessary for the establishment
of the grass buffer, overwatering could cause uneven growth which can inhibit the conveyance
of runoff and should be avoided. Every year the irrigation system should be drained and blown
out before the first winter freeze. The irrigation system should be inspected before reactivation
in the spring. Fertilizers and herbicides should be used only on an as -needed basis, and it is
recommended to use biodegradable nontoxic fertilizers and herbicides.
The following maintenance recommendations were found in the City of Aspen URMP.
210 S West End, Aspen, Colorado August 30, 2022
Drainage Report for Major Design 8
Mowing recommendations for grass buffers or vegetated rain gardens that are included in
the Urban Drainage Flood Control District USDCM: Volume 3 Stormwater Quality are
provided in the figure below.
6.3 Dry well (Flo-Well)
Dry wells must be inspected and maintained yearly to remove sediment and debris that is
washed into them. A maintenance plan shall be submitted to the City in the Drainage Report
describing the maintenance schedule that will be undertaken by the owners of the new
residence or building. Minimum inspection and maintenance requirements include the
following:
• Inspect dry wells as annually and after every storm exceeding 0.5 inches.
• Dispose of sediment, debris/trash, and any other waste material removed from a dry we ll
at suitable disposal sites and in compliance with local, state, and federal waste regulations.
• Routinely evaluate the drain-down time of the dry well to ensure the maximum time of 24
hours are not being exceeded. If drain -down times are exceeding the maximum, drain the
dry well via pumping and clean out the percolation area (the percolation barrel may be
jetted to remove sediment accumulated in perforations). Consider drilling additional
perforations in the barrel. If slow drainage persists, the system may need to be replaced.
7.0 Conclusion
The proposed BMPs (grass buffer, pervious pavers, and rain gardens) are expected to treat
100% of the required WQCV at the 210 S West End project with room to spare. With proper
maintenance and installation, these BMPs will meet the criteria outlined in the City of
Aspen’s current Urban Runoff Management Plan.
E
ICV
ICV
ICV
ICV
ICV
ICV
ICV
ICV
ICV
ICV
ICV
ICV
CO
CO
D
D
ICV
PERVI
O
U
S
PAVE
R
P
A
T
I
O
306 SQ
.
F
T
.
±
COVERED
ENTRY
22
.
9
0
'
11.50'
4.40'
10.30'
17
.
4
0
'
3.00'
14
.
4
0
'
3.30'
16
.
1
0
'
38.70'
16
.
1
0
'
9.00'
14
.
7
0
'
9.00'
12
.
1
0
'
14.70'
32
.
3
0
'
75.50'
CO
N
C
R
E
T
E
S
I
D
E
W
A
L
K
IRRIGATION
CONTROL (TYP.)
FLOW-WELL
RIM= 7931.67'
INV IN= 7930.59'
SUMP= 7926.66'
CONC
R
E
T
E
P
A
N
CO
ICV
ICV
W
G
CLEANOUT
RIM=7940.37'
SWEEP=7939.06'
CLEANOUT
RIM=7940.38'
SWEEP=7938.18'
CLEANOUT
RIM=7942.00'
SWEEP=7938.55'
CLEANOUT
RIM=7940.45'
SWEEP=7938.85'
4" PVC
3
.
0
%
FF=
7940.39'
FF=
7940.46'
RIDGE=
7960.90'
FF=
7940.43'
7940
7
9
4
0
79
3
5
7935
79
3
5
CO
N
C
R
E
T
E
C
U
R
B
A
N
D
G
U
T
T
E
R
FF=
7931.58'
FF=
7932.04'
FF=
7932.05'
7937.80'
7935.09'
TOE WALL
7932.23'
TOE WALL
7940.39'
7940.29'
IO 6"=
7937.35'
7931.29'7931.23'
7930.46'
7930.46'
7930.49'
7931.38'
7931.33'
7931.41'
7933.42'
7933.16'
7933.33'7932.76'
7932.92'
7931.32'
7931.30'
7931.31'7931.76'
7931.72'
7931.76'7931.96'
7931.89'
7931.96'
FLOW-WELL
RIM= 7931.90'
INV OUT= 7931.23'
SUMP= 7926.30'
TRENCH DRAIN
RIM=7931.53'
IO=7930.59'
7932.42'
7932.34'
7932.46'
7932.14'
7932.08'
7932.15'
FLOWLINE
PAN
PERVIOUS
PAVER
PATIO
177 SQ. FT. ±
7930.90'
7930.99'
7930.55'
7930.40'
7929.71'
7929.19'
7929.30'
7928.88'
7929.08'
7932.71'
7932.55'
7932.02'
7931.93'
7932.40'
7940.42'
7938.13'
7940.39'
7940.45'
7934.71'
7933.16'
7933.57'
7932.75'
7933.21'
7940.48'7940.46'
7940.45'
X
X
METAL
PLANTER
TIE
PLANTER
AND FENCE
7940.38'
UPPER
LEVEL
DECK
CANTILEVER
7938.04'
S
1
4
°
5
0
'
4
9
"
W
1
0
0
.
0
0
'
N 75°
0
9
'
1
1
"
W
9
0
.
0
0
'
N
1
4
°
5
0
'
4
9
"
E
1
0
0
.
0
0
'
S 75°0
9
'
1
1
"
E
9
0
.
0
0
'
CONC
R
E
T
E
STEPS
BOULDER
WALL(TYP.)
PERVIOUS
PAVER PATIO
174 SQ. FT.±
4" PV
C
0
.
9
0
%
FLOW
L
I
N
E
1
.
2
%
4"
P
V
C
0
.
8
0
%
CON
C
R
E
T
E
SIDE
W
A
L
K
CONCRETE CURB
& GUTTER
CONCRETE
DRIVE
7940.40'
7940.42'
7940.38'
7940.38'
7940.38'
7940.22'
NEW CURB
AND GUTTER
7940.32'
7940.30'
ICV
ADJOINER
CONCRETE
DRIVE
ALLE
Y
B
L
O
C
K
3
2
EAST
A
S
P
E
N
T
O
W
N
S
I
T
E
20.90'
R
.
O
.
W
.
A
S
P
H
A
L
T
WE
S
T
E
N
D
S
T
R
E
E
T
75
.
0
0
'
R
.
O
.
W
.
A
S
P
H
A
L
T
EAST
H
Y
M
A
N
A
V
E
N
U
E
74.80'
R
.
O
.
W
.
A
S
P
H
A
L
T
LOT N
7931.98'
7931.98'
7931.54'
7931.78'
210 S. WEST END STREET
LOTS K, L, & M
MULTILEVEL
STONE HOUSE
WITH ATTACHED UNITS
NO5
REBAR
FOUND
NO. 5 REBAR
& RED PLASTIC
CAP FOUND
DECIDUOUS
TREE 1"X4' (TYP.)
PE
R
V
I
O
U
S
PA
V
E
R
P
A
T
I
O
17
4
S
Q
.
F
T
±
7931.84'
7931.92'
CO
UPPE
R
L
E
V
E
L
D
E
C
K
PERVIOUS
PAVER WALK
42 SQ. FT. ±
7959.442
7937.31'
7934.63'
7934.49'
7934.71'
7934.66'
TOE WALL
7934.35'
TOE WALL
7934.58'
7935.22'
TOE WALL
7937.62'
TOP WALL
7933.53'
TOE WALL
7934.90'
TOP WALL
7937.05'
TOE WALL
7937.26'
TOE WALL
RAIN GARDEN
23 C.F.±
OVERFLOW
WEIR 7934.80'
OVERFLOW
WEIR 7937.52'
RAIN GARDEN
14 C.F.±
NOTICE: ACCORDING TO COLORADO LAW, YOU MUST COMMENCE ANY LEGAL ACTION
BASED UPON ANY DEFECT IN THIS SURVEY WITHIN THREE YEARS AFTER YOU FIRST
DISCOVER SUCH DEFECT. IN NO EVENT MAY ANY ACTION BASED UPON ANY DEFECT IN
THIS SURVEY BE COMMENCED MORE THAN TEN YEARS FROM THE DATE OF THE
CERTIFICATION SHOWN HEREON.
ByNO.Date Project NO.RevisionDrawn By:
Checked By:
Date:
Computer File:
P.O. Box 1746
Rifle, CO 81650
Phone (970) 625-1954
Fax (970) 579-7150
www.peaksurveyinginc.com
S
NW
E
P e a k S u r v ey i ng, Inc.
Es t . 2 0 0 7
22053
1 OF 1
WEST END HOME, LLC
ASPEN, COLORAD
AS-BUILT SURVEY
LOTS K, L, & M, BLOCK 32
210 S. WEST END STREET
SF
JRN
AUGUST 25, 2022
053 DWG
AS-BUILT
LOTS K, L,&M, BLOCK 32, ACCORDING TO THE IMPROVEMENT SURVEY PLAT
PROVIDED PER ASPEN SURVEY ENGINEERS, INC.
CITY OF ASPEN, COUNTY OF PITKIN, STATE OF COLORADO
AS-BUILT SURVEY CERTIFICATION STATEMENT:
I, THE UNDERSIGNED REGISTERED LAND SURVEYOR, HEREBY CERTIFY THAT THE ELEVATIONS,
GRADING AND DRAINAGE FEATURES SHOWN ON THE PROPERTY DESCRIBED AS:LOTS K, L, & M,
BLOCK 32 WERE DEVELOPED FROM SURVEYING THE PROPERTY ON THE DATE OF JULY 13, 2022
AND ACCURATELY DEPICT THE ELEVATIONS EXISTING DURING THE SURVEY. THE ELEVATIONS
MAY CHANGE SUBSEQUENT TO THE SURVEY DUE TO SUBSIDENCE, UPHEAVAL, EROSION, ACTS
OF MAN OR OTHER FACTORS. THEREFORE, THIS CERTIFICATE MAY NOT ACCURATELY DEPICT
ELEVATIONS, GRADING AND DRAINAGE PATTERN AFTER THE DATE OF THE SURVEY.
EASEMENTS ARE SHOWN PER THE PLAT UNLESS NOTED OTHERWISE. NO PART OF THIS LOT LIES
WITHIN THE 100 YEAR FLOODPLAIN AS DEFINED BY FEMA, EXCEPT AS NOTED. ERROR OF
CLOSURE FOR THIS IMPROVEMENT SURVEY PLAT IS LESS THAN 1:15,000.
BY:______________________________________ DATE:_______________________
JASON R. NEIL, P.L.S. NO. 37935
FOR AND BEHALF OF
PEAK SURVEYING, INC.
AS-BUILT ENGINEERING CERTIFICATION STATEMENT:
I, THE UNDERSIGNED REGISTERED PROFESSIONAL ENGINEER, CERTIFY THAT I HAVE
INSPECTED THE AS-BUILT SURVEY DATA FOR PROJECT SITE: LOTS K, L, & M, BLOCK 36, AND
HAVE CONCLUDED THAT THE PROPERTY WILL DRAIN ADEQUATELY IN CONFORMANCE WITH
THE DRAINAGE PLAN SUBMITTED AND APPROVED BY THE CITY ON DATE: ____________________.
BY: _______________________________________ DATE: _________________
PE LICENSE NO. _______________________
NOTES:
1) THIS PROPERTY IS SUBJECT TO RESERVATIONS, RESTRICTIONS, COVENANTS, BUILDING
SETBACKS AND EASEMENTS OF RECORD, OR IN PLACE. THIS SURVEY WAS PREPARED WITHOUT
THE BENEFIT OF A TITLE COMMITMENT THEREFORE, EXCEPTIONS TO TITLE THAT MAY AFFECT
THE SUBJECT PROPERTY HAVE NOT BEEN RESEARCHED BY PEAK SURVEYING, INC.
2) THE DATE OF THIS SURVEY WAS JULY 13, & 29, 2022.
3) BASIS OF BEARINGS FOR THIS SURVEY IS A BEARING OF N75°09'11""W BETWEEN THE
SOUTHWEST CORNER OF LOT K, A #5 REBAR FOUND IN PLACE AND THE SOUTHEAST CORNER OF
LOT M, A #5 REBAR AND RED PLASTIC CAP P.L.S.# ILLEGIBLE FOUND IN PLACE.
4) UNITS OF MEASURE FOR ALL DIMENSIONS SHOWN HEREON IS U.S. SURVEY FEET.
5) THIS SURVEY IS BASED ON THE DESIGN SURVEY PROVIDED BY ASPEN SURVEY ENGINEEERS
INC, DATE AUGUST. 2018 AND CORNERS FOUND IN PLACE.
6) ELEVATIONS ARE BASED ON A ON-SITE ELEVATION ON A SURVEY PREPARED BY ASPEN
SURVEY ENGINEERS INC, DATED AUGUST, 2018 (1988 DATUM) YIELDING AN ON-SITE ELEVATION
OF 7925.42' ON THE COA MONUMENT #4, A TBM AS SHOWN. CONTOUR INTERVAL EQUALS 1
FOOT.
7) THE SUBJECT PROPERTY WAS UNDER CONSTRUCTION AT THE TIME OF SURVEY.
N
E
S
W
0
30
60
90
120
150
180
210
240
270
300
330
P
e
a
k
S u r v e y i n
g
,
I
n
c
.
010 10 20 405
BOUNDARY
LINE TYPE LEGEND
STORM SEWER
ELECTRIC
EASEMENT
EX-ST
EX-UE
ASPHALT
CONCRETE
SYMBOL LEGEND
WATER SHUT OFF
GAS METER G
SET MONUMENT
ELEC. TRANS.
EDGE OF ROAD
IRRIGATION VALVE
FOUND MONUMENT
SEWER MANHOLE
ELEC. METER
S
SPOT ELEVATIONS
AIR COND. UNIT
OSW
SETBACK
PVC DRAIN LINE
TELEPHONE T
CABLE TV CTV
GASLINE G
FIBER OPTIC FO
TELEPHONE T
STORM DRAIN D
ELEC. OUTLET
ADJ. BOUNDARY
CABLE TV PED.
STREET LIGHT
SEWER LINE
WATER LINE W
0000.00'
E
E
A.C.
ICV
08/25/22
08/25/22
COL O R A D O L I CE
N
S
E
D
P
R
O
F
E
SSIONAL L A N D S U RVEYO
R
JAS O N R . N
E
I
L
37935
08.30.2022
Graphic Scale
In Feet: 1" = 5'
0 2 5 10
Title:
Drainage Plan
Re
v
i
s
i
o
n
#
Dwg No.
21
0
S
W
e
s
t
E
n
d
S
t
r
e
e
t
As
p
e
n
,
C
o
l
o
r
a
d
o
8
1
6
1
1
Job No.
Drawn by:
Date:
File:
PE:QC:
2020-474
JAK
08.04.2021
RLB
Sack-GradingPlan
DJC
11
8
W
e
s
t
S
i
x
t
h
S
t
r
e
e
t
,
S
u
i
t
e
2
0
0
Gl
e
n
w
o
o
d
S
p
r
i
n
g
s
,
C
O
8
1
6
0
1
97
0
.
9
4
5
.
1
0
0
4
w
w
w
.
s
g
m
-
i
n
c
.
c
o
m
Da
t
e
By
:
C4
10Of :
Pe
r
m
i
t
S
e
t
Pr
o
j
e
c
t
M
i
l
e
s
t
o
n
e
: