HomeMy WebLinkAboutTHE MARK - FDP240013 - SUBMITTAL DOCUMENTS - ROUND 2 - Responses (8)
301 N Howes Street Suite 100 Ft Collins, CO 80521 | (970) 221-4158 | epsgroupinc.com 1 of 2
July 30, 2024
Sophie Buckingham
Engineering Development Review
City of Fort Collins
281 N. College Avenue
Fort Collins, CO 80524
Project # 24-0409
The Mark PDR240006 – Storm Sewer Cover
Variance Description:
This is a request for variance to the standard Section 12.2.2 of the Larimer County Urban Area Street Standards
(LCUASS Fort Collins).
Variance to this Standard will allow for less than 2’ of cover from the top of a proposed storm line within roadways.
Technical Design Criteria:
LCUASS Section 12.2.2 states, “All utilities shall be located at least 2 feet below the scarified subgrade elevation, unless
specifically approved to be less by the Local Entity Engineer.”
Identifying the issue:
Due to site constraints the required depth is not met in certain areas as depicted with the utility plans, specifically
crossing Johnson Drive. The proposed storm sewer has 2’ or more of cover within the pavement section. At the
flowline of the curb and gutter, the storm sewer has 1.77’ of cover.
A more significant issue is that the proposed storm sewer has already been constructed. The improvements on
Johnson Drive that are over the storm sewer along with the building’s foundation have already been constructed as
well. This project was approved by the City of Fort Collins on 02/25/2020 under the name of “Utility Plans for
Johnson Drive Apartments”. The site has been vacant for some time now which has triggered the need for a full
entitlements process again for someone new to go in and finish construction.
Justification for Less Storm Sewer Cover
Storm Sewer is Already Installed
Mentioned in the “Identifying the Issue” section, this project was approved some time ago and was in the
middle of construction before it came to a screeching halt. Because the previously approved plans have
expired, the City is requiring another entitlements process before construction can begin.
The existing storm sewer vertical alignment has already been approved by the City once before. The storm
sewer has already been constructed as well.
301 N Howes Street Suite 100 Ft Collins, CO 80521 | (970) 221-4158 | epsgroupinc.com 2 of 2
Reinforced Concrete Pipe Strength
• The typical concern when minimum coverage cannot be designed is potential pipe damage and pavement
cracking. Northern Engineering has specified that all pipes found within the Right-of-Way be Reinforced
Concrete Pipe Class III (RCP) and Class III bedding or better. RCP Class III has an ultimate load bearing
capacity of 2000 lbs/ft/ft. According to ASTM C 76.AASHTO M 170 a Class III pipe will suffice for an AASHTO
HL-93 Highway load for pipes with less than a foot of cover. We believe that with the specification of Class
III RCP there will be no adverse impacts to the roadway sections where shallow pipe is installed.
Conclusion
We do not feel that this variance will increase risks to public health, safety, or welfare, nor will it reduce the design
life of any public infrastructure or cause the City of Fort Collins additional maintenance costs.
We look forward to continuing to work with the City on solutions that provide a multitude of benefits.
Please call if you have any questions.
Sincerely,
Cody Pape, P.E.
Project Engineer
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EXISTING HEADWALL
EXISTING 36" RCP
GROUTED RIPRAP PAD
TO BE PLACED FLUSH WITH
EXISTING BOTTOM OF
CHANNEL.
(SEE DETAIL FOR SIZING)
FLOODPLAIN USE PERMIT
AND NO-RISE
CERTIFICATION WILL BE
REQUIRED FOR STORM
OUTFALL INSTALLATION
EXISTING WATERLINE
ENCASEMENT
EXISTING 3-PHASE
SWITCH CABINET
EXISTING 30" RCP
SANITARY SEWER
EXISTING 24" PVC
WATERLINE
SWALE
SIDEWALK
CULVERT
TRANSFORMER
SAND FILTER
EXISTING GAZEBO
CONTRACTOR TO AVOID
DAMAGE TO FOOTERS
EXISTING WATER FOUNTAIN
TO BE PROTECT IN PLACE
RELOCATE EXISTING BOULDERS
INTO RELOCATED BANK. GROUT
TO INTEGRATE INTO GROUTED
RIPRAP PAD.
100-YR
FLOODWAY
100-YR FEMA
HIGH-RISK FLOODPLAIN
EX FES A1
STA 10+00.00
N: 122090.57
E: 194245.53
EX STMH A1
STA 11+36.62
N: 121954.33
E: 194235.29
EX STRM A3 - TIE TO BLDG OUTFALL
STA 13+19.73
N: 121771.23
E: 194234.18
EX STRM A1.1 - EX INLET
STA 10+29.77
N: 121947.45
E: 194264.25
136.62 LF 18" RCP @ 1
.
0
0
%
183.10 LF 18" RCP @ 0.63%
29.77 LF 12" RCP @ -0.13%
MH CONSTRUCTED, INVERT
ELEVATIONS TO BE VERIFIED
IN FIELD.
4970
4975
4980
4985
4990
4995
5000
5005
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4980
4985
4990
4995
5000
5005
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PROPOSED GROUND
EXISTING GROUND
EX 24" PVC WATER
STA.=12+02.24
TOP=4982.56
EX 30" STORM
STA.=11+85.61
INV.=4977.32
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20 20 40 60
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20 20 40 60
7
PROFILE SCALE:
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CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
before you dig.Call
R
LEGEND:
NOTES:
PROJECT BOUNDARY
PROPOSED STORM SEWER
EXISTING ELECTRIC VUALT
EXISTING WATER METER
EXISTING IRRIGATION BOX
EXISTING POWER POLE
EXISTING GAS METER
EXISTING TELEPHONE PEDESTAL
EXISTING LIGHT POLE
PROPOSED FIRE HYDRANT
EXISTING FIRE HYDRANT
PROPOSED LOTLINE
EASEMENT LINE
CONTROL
IRR
SPROPOSED SEWER SERVICE
PROPOSED WATER SERVICE W
PROPOSED CURB & GUTTER
1.THE SIZE, TYPE AND LOCATION OF ALL KNOWN UNDERGROUND UTILITIES ARE
APPROXIMATE WHEN SHOWN ON THESE DRAWINGS. IT SHALL BE THE
RESPONSIBILITY OF THE CONTRACTOR TO VERIFY THE EXISTENCE OF ALL
UNDERGROUND UTILITIES IN THE AREA OF THE WORK. BEFORE COMMENCING NEW
CONSTRUCTION, THE CONTRACTOR SHALL BE RESPONSIBLE FOR LOCATING ALL
UNDERGROUND UTILITIES AND SHALL BE RESPONSIBLE FOR ALL UNKNOWN
UNDERGROUND UTILITIES.
2.ALL WATER CONSTRUCTION SHALL BE PER THE FORT COLLINS STANDARD
CONSTRUCTION SPECIFICATIONS LATEST EDITION.
3.ALL SANITARY CONSTRUCTION SHALL BE PER THE FORT COLLINS STANDARD
CONSTRUCTION SPECIFICATIONS LATEST EDITION.
4.ALL WATER FITTINGS AND VALVES ARE ONLY GRAPHICALLY REPRESENTED AND ARE
NOT TO SCALE.
5.UTILITY SERVICES ARE SHOWN IN A SCHEMATIC FASHION ONLY. EXACT LOCATIONS
SHALL BE PER THE REQUIREMENTS OF THE RESPECTIVE UTILITY PROVIDERS, AND
ARE SUBJECT TO CHANGE IN THE FIELD.
6.MAINTAIN 10' HORIZONTAL AND 18" VERTICAL MINIMUM SEPARATION BETWEEN ALL
SANITARY SEWER MAINS, WATER MAINS & SERVICES.
7.REFER TO THE PLAT FOR LOT AREAS, TRACT SIZES, EASEMENTS, LOT DIMENSIONS,
UTILITY EASEMENTS, OTHER EASEMENTS, AND OTHER SURVEY INFORMATION.
8.CONTRACTOR SHALL BE RESPONSIBLE FOR ANY NECESSARY FIELD LOCATES AND
POTHOLING OF SUBSURFACE UTILITIES. ENGINEER AND CITY SHALL BE NOTIFIED OF
ANY POTENTIAL CONFLICTS.
9.REFER TO PLUMBING PLANS FOR ALL WATER SERVICE AND SANITARY SEWER
SERVICE LOCATIONS. IF CONFLICT OCCURS, BOTH THE PLUMBING ENGINEER AND
CIVIL ENGINEER SHALL BE CONTACTED PRIOR TO INSTALLATION OR ORDERING OF
MATERIALS.
10.ALL STORM SEWER IS TO BE OWNED AND MAINTAINED BY PROPERTY MANAGER.
11.ANY DAMAGED CURB, GUTTER AND SIDEWALK EXISTING PRIOR TO CONSTRUCTION,
AS WELL AS STREETS, SIDEWALKS, CURBS AND GUTTERS, DESTROYED, DAMAGED
OR REMOVED DUE TO CONSTRUCTION OF THIS PROJECT, SHALL BE REPLACED OR
RESTORED TO CITY OF FORT COLLINS STANDARDS AT THE DEVELOPER'S EXPENSE
PRIOR TO THE ACCEPTANCE OF COMPLETED IMPROVEMENTS AND/OR PRIOR TO THE
ISSUANCE OF THE FIRST CERTIFICATE OF OCCUPANCY.
12.CONTRACTOR TO COORDINATE FINAL LOCATION OF ALL GAS AND ELECTRIC METERS
WITH ARCHITECT AND UTILITY PROVIDERS.
13.CONTRACTOR TO COORDINATE FINAL LOCATION OF IRRIGATION SHUT-OFF VALVE
AND BACKFLOW DEVICE WITH LANDSCAPE ARCHITECT AND SPRINKLER
CONTRACTOR.
14.CONTRACTOR TO COORDINATE SITE LIGHTING (LANDSCAPE) TO ENSURE NO
CONFLICTS WITH OTHER UTILITIES.
15.CROSSPANS ALONG PUBLIC STREETS AT THE INTERSECTION OF PRIVATE DRIVES
SHALL HAVE CONCRETE EXTENDED TO THE RIGHT-OF-WAY LINE.
16.THE NATURAL HABITAT BUFFER ZONE IS INTENDED TO BE MAINTAINED IN A NATIVE
LANDSCAPE. PLEASE SEE SECTION 3.4.1 OF THE LAND USE CODE FOR ALLOWABLE
USES WITHIN THE NATURAL HABITAT BUFFER ZONE.
17.DEVELOPMENT MUST COMPLY WITH THE FLOODPLAIN REGULATIONS IN CHAPTER 10
OF THE CITY MUNICIPAL CODE.
EXISTING ELECTRIC E
G
FO
EXISTING STORM SEWER ST
EXISTING FIBER OPTIC
EXISTING SANITARY SEWER SS
EXISTING WATER W
EXISTING STORM MANHOLE
EXISTING SANITARY MANHOLE S
D
EXISTING GAS
GAS
VAULT
ELEC
STORM LINE A1.1