HomeMy WebLinkAboutFOSSIL LAKE P.U.D., SECOND FILING - COUNTY APPROVAL - 33-01E - CORRESPONDENCE - REVISIONS (5)RESPONSE: The developer is working with Bob Zakely on this permit process.
2. Please show units of for water surface elevation and velocity on all comparison tables.
RESPONSE: Units are now provided on all comparison tables.
3. Under section III, A, please discuss the increase in velocity in cross-section 11.55.
RESPONSE: This is now discussed in section III, A.
4. Please provide a copy of the effective condition map in the report.
RESPONSE: The effective condition maps are provided in Appendix F.
5. Please include the corrected effective and proposed conditions maps in the back of the report.
RESPONSE: These are now provided in the back map pocket.
6. Please note in the report why cross-section 11.1 was selected to the transition from the 1984
topography to the surveyed topography for developing the corrected effective cross -sections.
RESPONSE: This is now discussed in section II of chapter 2.
7. Please include a corrected effective floodplain map that clearly shows the existing contours for the
channel used to develop the corrected effective cross -sections.
RESPONSE: A larger scale corrected effective floodplain map is now provided in the back map
pockets.
8. Please verify cross-section 11.1 in the proposed conditions model with the proposed condition
topography.
RESPONSE: Cross-section 11.1 has been corrected on the plans and in the Hec-II model.
9. Please use stationing to define the ineffective flow area for proposed cross -sections 11.2 and 11.3.
Also show the projected area of the culverst on the plots for cross -sections 11.2 and 11.3.
RESPONSE: Please see the revised Hoc -II model.
10. Please realign the Swale from pond 3 to angle to the northeast entering McClellands channel in the
direction of flow within McClellands Channel.
RESPONSE: Pond 3 and Swale 3 are no longer to be constructed with this site.
11. Please show buried rip -rap for the right bank channel near lots 4 and 5. The buried rip -rap should
extend from beneath the toe of the slope to above the 100-year water surface.
RESPONSE: This is now shown on the plans.
Vice President / Project Manager
(CE) to represent additional conveyance to this basin. If a CE is used, it should start at the
midpoint of the basin. Since flow from the downstream portion of the basin would otherwise be
routed through the entire length of the basin. The current CE418 length of 586 feet is acceptable.
RESPONSE: The overland flow length for basin 503 has been revised. Please see the revised
SWMM model in Appendix B of the drainage report.
11. Please provide all the output for the revised SWMM in the report, which is needed to fully review
the model.
RESPONSE: All SWMM output is now provided in Appendix B of the drainage report.
12. Why does CE 418 (which represents a channel) have storage? Please increase the channel
parameters in SWMM for this element to prevent this from happening.
RESPONSE: An overflow channel has been added to CE 418. Storage no longer occurs in this
conveyance element. Please See Appendix B of the drainage report.
13. Please show the grading for the existing (V Filing) swale along the south side of basin 24 (sheet
17) and be sure they tie-in with the proposed grading. If the Swale will be disturbed, please
provide a cross-section of the revised swale with calculations in the report
RESPONSE: The grading has been shown. No revision are required.
14. Please review and revise (if necessary) some of the storm sewer flows in Appendix G.
RESPONSE: The flows were revised as necessary.
15. Please call out the WQ outlet system on the utility plans.
RESPONSE: The WQ outlet system has been called out on the plans.
16. Why are there orifices for the WQ outlet pipes on WQ ponds 1 and 3? Since the pipes are installed
to minimized overflow weir usage, why no let as much flow as possible through these pipes?
Please remove the orifices and/or explain their need.
RESPONSE: The orifices have been removed from WQ ponds 1 and 3.
17. The response to why WQ pond 2 does not have an overflow pipe (like in ponds 1 and 3) seems
inadequate. What would need to be 40-feet wide? All that is needed is an overflow structure with
a pipe that would carry the 10-year flows. Due to the large amount of flows that enter the pond, it
may be more appropriate to provide a system that carries the 2-year flows. Please contact Basil
Hamdan (224-6035) to discuss this issue.
RESPONSE: WQ pond 2 now has an overflow pipe similar to pond 1. The pipe has been
designed for the 2-year flow.
18. Please use the City of Fort Collins general notes on the cover sheet. Refer to page 2-4 of the City
of Fort Collins Strom Drainage Design Criteria and Construction Standards (SDDS) for these
notes.
RESPONSE: The notes on the cover sheet are adequate as shown.
Stormwater Master planning (dated February 7, 2001)
1. The realignment of McClellands Creek will impact waters of the United States, and will, therefore,
require a 404 permit from the U.S. Corps of Engineers. It should also be noted that the Corps
cannot issue a 404 permit for any project unless the requirements of the endangered species act
have been fulfilled, such as surveys for Prebles's meadow jumping mouse and the Ute Lady
tresses orchid.
RESPONSE: This sign has been added.
Stormwater (dated February 7, 2001)
1. Backlot swales that drain more than 3 lots are not allowed, therefore the backlot Swale in the
northwest corner of the site should be removed. Since the offs -site area that the swale was
intending to capture is only 1.2 acres, the flows could simply pass through the lots, distributing the
flows from the 1.2 acres evenly. In addition, side lot drainage easements (5 feet each side of lot
line ) for these lots should be provided.
RESPONSE: The swale has been removed and drainage will now drain through the lots.
2. Please place the 20-foot drainage easement in lot 15, block 9 in an outiot. The maintenance of this
drainage facility should not be the responsibility of the lot owner.
RESPONSE: These drainage facilities have been relocated and the tract is no longer required.
3. Please direct the swale exiting WQ pond 3 into the direction of McClellands Channel, instead of
perpendicular to it.
RESPONSE: The swale and WQ pond 3 have been removed. The proposed plan is to design and
build an offsite Water Quality pond with phase 3.
4. Please provide off -site drainage easements by separate document for the WQ ponds and outfall
channel near the southeast corner of the site.
RESPONSE: The easements will be provided by separate document as required
5. Please direct the flows from storm sewer S3 into the swale it outlets into while maintaining the
swale for the end of the street at that location.
RESPONSE: This configuration has changed and storm sewer S3 is no longer being built with
this project. Please see grading sheets. The proposed road mmming along the east boundary (lake
Ranch Road) is no longer going to be built with this project. All roads that would have intersected
Lake Rand Road will now end with temporary tum-grounds. Lake Ranch Road will be designed
with future development of the property to the east.
6. Cross -sections 127+00 of CR 32 shows 2:1 Slopes (see sheet 51). Please provide no steeper than
3:1 slopes in this area If necessary, please provided additional ROW or grading easement in this
area.
RESPONSE: The grading has been revised to be no steeper than 3:1.
7. There are a few intersections where flows are meant to turn the corner according to the drainage
delineations, but the spot elevations provided do not clearly show this (see sheet 30 and 33).
Please provide additional spot elevations that show flow will be contained in gutter and will not
flow over the crown of intersections.
RESPONSE: Additional spot elevations have been provided for clarification.
8. Why will the inlet on the north side of CR32 be installed in the future? How will flow from
around the bridge be removed if there is no inlet in the interim? Please address theses concerns
and provide the inlet now if necessary.
RESPONSE: The plans now indicated that the inlet is to be built with the box culvert.
9. Please provide a SWMM schematic that shows all basins and conveyance elements.
RESPONSE: A SWMM schematic is now provided in Appendix B of the drainage report.
10. Overland flow lengths (OFLs) should be based on the physical characteristics of the basin, which
for developed residential basins are around 100-300 feet. Please reduce the OFL for proposed
basin 503 to take this concept into consideration. It is acceptable to use a conveyance element
N idblock cross -pans are 12' minimum width (Sheet 38)
RESPONSE: The midblock pan has been removed and drainage will now be direted to the east.
Sheet 38: Swallow or Shallow?
RESPONSE: The street name is Shallow Pond Drive, corrections have been made to eliminate any
typo in the set.
Sheet 45: Right turn lane needed on County Road 36.
RESPONSE: Concurrent with the development of phase 3, the Kechter Road improvements shall
be installed. Final design of the westbound right hand turn lane at the intersection of Kechter Road
and Ziegler Road as well as right of way and easement acquisition shall occur prior to
commencement of construction of the Kechter Road improvements.
Sheet 48: switch the striped out area and the bike lane
RESPONSE: The striping has changed as requested, please see sheet 48.
25. Please see plan sheets for additional comments
RESPONSE: The additional redline comments have been addressed accordingly.
Larimer County Building Department
The following addresses proposed are duplicates and must be changed:
Wild Flower Court
Green Spring Court
Copper Spring Drive
RESPONSE: The above street names have been changed to:
Copper Spring Drive
Green Spring Drive
Round Rock Court
Larimer County Surveyor (dated February 5, 2001)
The plat for the subject development has been reviewed by this office and has been found to be
acceptable.
Traffic Operations (dated February 14, 2001)
1. Delete the "white Island" cross hatching, item #9.
RESPONSE: This hatching has been deleted.
2. Delete the broken line striping at the west bound left turn bay, item #2.
RESPONSE: This striping has been deleted.
3. Delete the reversible left turn arrows in the two way left turn lane, item F.
RESPONSE: The arrows have been deleted.
4. Add Rl-I signs to the Cr36 legs of the CR9/CR36 intersection (two-way stop control).
RESPONSE: These signs have been added
5. Add RI -I sign on Trilby at the CR 36/frilby intersection.
22. Grading sheet 10: Are the curvy sidewalks being built with this project
RESPONSE: The sidewalks are to be built with a future addition to Fossil Lake. As such they
have been changed to match the shading of future additions.
23. On typical street section diagram, the pavement design report should be referenced, not the soils
report.
RESPONSE: The typical street section diagrams have been modified to references the pavement
design report.
24. On Street plan and profile sheets:
Please show additional elevation where required
RESPONSE: Additional detail has been added.
Some areas exceed maximum cross slope
RESPONSE: Grades were adjusted where appropriate to insure that cross -slopes do not exceed
4%.
Some areas don't meet minimum K values
RESPONSE: Due to close proximity as well as drainage requirements the vertical curves in
Trilby Road between Long Creek Drive and C.R. 36 fall short of the standard K values for a
collector and fall more in line with those of a local street. However, due to the nearness of the
Trilby Road and C.R. 36 intersection the traffic will either be accelerating from or decelerating to
a stop in this block of approximately 233 feet. Consequently, the traffic speeds will most likely
never achieve the design speed of a collector.
As a result of drainage requirements and the proximity to Filing 1, the vertical curves in Falling
Water Drive between Ledgestone Court and Fossil Lake First Filing do not meet the standard K
values for a local street. However, since this is not a through street and there are crosspans on
either side of Ledgestone Court traffic will either be slowing or accelerating as it approaches or
departs Ledgestone Court, respectively. Therefore, the the traffic speed along this 117length of
street will most likely never achieve design speed.
Please show station tick marks
RESPONSE: Due to the use of flowline stationing for the street design, centerline station tick
marks have not been shown.
Cover of encasement appears to be in pavement section or have insufficient cover (Sheet 29 &
33), needs to be tongue and groove, not spigot.
RESPONSE: The distance from top of pipe to flowline has been labeled in close situations. Storm
Drain S2 has changed from 30" RCP to 24"x38" HERCP.
Elbow area at end of Long Creek Drive is flat and will not work
RESPONSE: The elbow area has been modified to provide drainage greater than 1% in the flat
area.
Please taper ends of median as shown on sheet 33.
RESPONSE: The median has been removed.
On vertical curb sections, driveway cuts need to be shown.
RESPONSE: The vertical curb sections have changed to drive over curb & gutter to better
accommodate driveways.
Please reconcile street widths with typical street sections values shown (sheet 38)
RESPONSE: The typical sections have been changed to reflect actual street widths.
9. Please line up sidewalks perpendicularly across Snowy Creek Drive
RESPONSE: The sidewalks now intercept Snowy Creek Drive perpendicularly.
10. With Phase 1 exceeding 660' from on point of access, two points of access are needed.
RESPONSE: The main site access will come from the connection of Trilby Road to Fossil Lake
First Filing. A temporary access road connecting Trilby road to County Road 36 will serve as the
emergency access for phases 1 and 2. This emergency access road was designed as part of Fossil
Lake First Filing please references Fossil Lake First Filing sheets 44 and 44a for information
pertaining to the emergency access.
11. On the Phasing plan, please show barricades at ends of streets, and extend them to back of walk.
RESPONSE: The barricades have been extended to the back of walk and note indicating that all
barricades are to be built from B.O.W. to B.O.W. has been added to the phasing sheet.
12. Phase 3 should include CR36
RESPONSE: Phase three has been changed to include County Road 36 (Kechter Road). The
phasing plan has been modified to show this.
13. Please increase tiny fonts so they are legible and reproducible
RESPONSE: The tiny fonts relevant to the phasing plan have been increased; fonts not relevant to
the phasing plan have been removed. In addition each phase has been labeled with a large font for
quick and easy identification of phases.
14. Please obtain easements and show rights -of -way for offsite improvementstgrading
RESPONSE: All required easements will be obtained prior to construction as noted on the plans.
15. Please widen sidewalks past edge of lot lines (see A2 for example)
RESPONSE: The sidewalks have been widened as requested
16. Easements are needed from the City for work done offsite along McClelland Channel and grading
needs to be coordinated with City Parks.
RESPONSE: Coordination for the improvements to the McClelland Channel are underway
currently. Easements shall be provided prior to constmction
17. Please provide city approval block for signatures from Parks and Stormwater on sheets addressing
the McClelland Channel improvements.
RESPONSE: The requested signature blocks are provided.
18. Sheet M3: The parapet wall needs to be stone to match the other bridge over the channel at
Harvest Park.
RESPONSE: The parapet wall is now shown as stone.
19. Sheet S2: Add culvert notes.
RESPONSE: Culvert notes have been added.
20. Muscrat Creek Drive: Muskrat is spelling found in dictionary
RESPONSE: The spelling of Muscrat has been changed to Muskrat
21. Utility plan sheet 6: please show a ramp at the end of Ledgestone Court. Will this work with the
sidewalk culvert location?
RESPONSE: The culvert location has moved 5' away from the ramp to insure that the ramp will
not have any conflict with the sidewalk culvert
ROW for the bike/park lanes along Muskrat Creek Rd. since this will be designated a "Safe Route
to School" for children biking to school.
RESPONSE: Curb bulb outs will not be provided due to the changes to the engineering plans that
would be required. Muskrat Creek Rd. has been widened as requested. However, to maintain the
build -ability of the lots along the road it was widened a total of 4 feet, 2 feet on each side.
5. On the Southern edge of the development an enhanced crosswalk is needed at the walking/bike
trail crossing.
RESPONSE: Due to the low traffic numbers that will utilize this Snowy Creek Drive and the
likelihood that this trail may be located on another property the enhanced crosswalk will not be
provided.
Advanced Planning (dated January 24, 2001)
No Comments
Engineering (dated January 29, 2001)
1. McClelland signature needed on the cover sheet
RESPONSE: The signature block requested for approval by the City of Ft. Collins for
improvements to the McClelland channel will be provided.
2. City will not maintain public facilities until they are annexed by the city. (Maintenance of Public
Facilities section on Sheet 1)
RESPONSE: Reference should be made to the Intergovernmental Agreement
between Latimer County and the City of Ft. Collins for the Fossil Creek
Reservoir Area which addresses this issue.
3. Please refer to all sight distance easements in note on sheet 1
RESPONSE: The standard sight distance easement notes are provided.
4. Please include a note to indicate who is to own and maintain the Outlots and Tracts.
RESPONSE: A note indicating ownership and maintenance of the Outlots and Tracts is provided.
5. Regarding Note 4 on Sheet 3: side lot easements for lots adjacent to ROW need to be labeled,
otherwise (per this note) they are 6'. They need to be 9' or revise note.
RESPONSE: The easements have been labeled.
6. County Road 9 will be known as Ziegler.
RESPONSE: County Road 9 is shown as Ziegler
7. Sheet 3
The South Fort Collins Sanitation District needs to sign the plat showing acceptance of
this easement.
RESPONSE: A signature block is provided for the South Fort Collins Sanitation District
and they will sign the plat
ROW for Lake Ranch Road needs to be dedicated for the full road, and the full road must
be built. Show offsite ROW and easements.
RESPONSE: The construction of Lake Ranch Road will not be included with the 2°a Filing.
8. All tracts with sidewalks through them must also be access easements
RESPONSE: All tracts with sidewalks through them are also access easements.
March 8, 2001
Mr. Russell Legg
Chief Planner,
Larimer County Planning Department
P.O. Box 1190
Fort Collins, CO 80522-1190
RE: Fossil Lake P.U.D., Second Filing
Larimer County, Colorado
Project No. 9959.00; FLS
Dear Mr. Legg:
E N G I N E E R I N G
Northern Engineering has received the review conducted by Latimer County and the City of Fort
Collins of the Fossil Lake P.U.D., Second Filing Final Utility Plans. Based upon their review we have
revised the final utility plans and would like to provide the following comments and or supporting
documents:
Current Planning (dated February 2, 2001)
1. The developer should prepare an annexation map for use by the City of Ft. Collins.
RESPONSE: Annexation of this property will likely take place in the near future. However the
details of the annexation have not been resolved at this time. This subdivision should be allowed
to move forward with approval with the understanding that negotiations regarding the annexation
are on going.
Transportation Planning (dated January 24, 2001)
1. The bridge spanning McClelland Drainage canal needs to consist of 8-foot sidewalks due to the
bridge railing and attached walk.
RESPONSE: As directed by Sheri Wamhoff, Ft. Collins Engineering Dept., 7-foot sidewalks shall
be provided.
2. An 8-foot trail is planned to run along the McClelland Drainage canal that will connect the park,
school and neighborhoods to the north A grade -separated underpass should be constructed with
the new bridge to reduce potential conflicts with trail users. Contact Pete Wray in the City's
Advanced Planning department for the trail alignment and the Latimer County Street Standards
for information regarding grade -separated crossings.
RESPONSE: An 8-foot sidewalk has been added along the west side of McClelland Channel. In
addition the sidewalk connecting the trail to the intersection of Trilby and County Road 36 has
been widened to 8 feet.
3. Construct directional handicap/access ramps at all intersections. ADA and City standards now call
for directional ramps.
RESPONSE: A detail for these directional handicap ramps has not been made available for
designing the ramps. These ramps are not part of the new Latimer County Road standards. We
would request that the plans are approved without the directional ramps.
4. To improve pedestrian visibility and reduce vehicle speeds, consider placing curb extensions (bulb
outs) at intersections along Muscrat Creek Road. Furthermore, provide an additional 3-feet of
420 SOUTH HOWES, SUITE 202, FORT COLLINS, COLORADO 80521, (970) 221-4158, FAX (970) 22 1 -4159