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HomeMy WebLinkAboutCHEROKEE FLYING HEIGHTS - PDP - 17-00 - CORRESPONDENCE - REVISIONS (8)O2 Existing: Glnc�ok�c. aak�3 * 6" DIP water line FI � � q4t � U VerAv: * Exact horizontal and vertical location existing water line Sawcut and Remove * Approximately 1794 SF of existing pavement; Haul NOTE The above estimated quantity is required for utility removals and new utility installation. Additional removals will be required along existing curb and gutter for new curb and gutter installations. See Master Improvements Plan. Furnish and Install: * 1 -6" x 6" tapping saddle with thrust block * 1 —6" gale valve * 1 — 8" x 6" increaser * Asphalt patch * See street patchback detail (PD 2) Lower Waterline: * Provide 18" minimum vertical clearance below sewer (See Note 2 below) * Concrete encase joints of existing sewer Ilne * See waterline lowering detail on detail sheet * See sewer joint encasement detail on detail sheet. * See bedding detail (Detail No. 1) NOTE 1: * Existing pavement thickness of Taft Hill Road at utility installation location, according to field core data provided by Terrocon on 02/13/2001 is as follows: 10" asphalt 5" aggregate base course Sawcut line to be as directed by City of Fort Collins Engineering Inspector NOTE2: * WATER LINE INSTALLATION SHALL NOT PROCEED UNTIL ITEMS 1-3 ARE COMPLETED I 1. Field verify exact horizontal and vertical location of existing water and sewer lines at time of water line installation. Deliver information to Shear Engineering Corporation, see note 3 below. 2. Shear Engineering Corporation shall provide City of Fort Collins Water Utility with updated/as—built water line lowering info indicating actual elevations of water line Installation. 3. Shear Engineering and the Fort Collins Water Utility shall approve water line lowering with field construction/verification. * If 18 inch vertical clearance over the sewer line can be achieved, then install water line over the sewer line and concrete encase joints of sewer line ten feet (10') either side of crossing. * If 18 inch vertical clearance over the sewer line cannot be achieved, lower the water line under sewer line and concrete encase joints of sewer line ten feet (10') either side of crossing. * See joint encasement detail on detail sheet * See water line lowering on sheet 4. O3 Existing: Project No: 1760-01-00 December 26, 2001 Re: Cherokee Flying Heights; Fort Collins, Colorado Responses To Comments, Comments Dated September 4, 2001 R We feel the plans and the lowering detail provided, adequately prepare the contractor for the crossings. Potholing in Taft Hill Road is unwarranted at the design stage. Additionally, this procedure will be the safest during construction activities, will provide the smoothest flow of traffic, and will allow the contractor to thoroughly inspect existing conditions. R We would be glad to meet with you to discuss this item further, if necessary. 26. Coordinate landscape plan with utility plan. R Acknowledged. We trust that this response has addressed a majority of your specific comments and concerns. If you have any questions or further comments during your next detailed project review, please call at (970) 226-5334. Sincerely Michael Rohlfs Shear Engineering Corporation MR / dh attachments cc: Mike Jensen Mikal Torgerson; M Torgerson Architects Derick Marchi; Advanced Professional Engineering Inc. Rick Lewis; RJL Surveyors Marc Virata; City of Fort Collins Engineering Wes Lamarque; City of Fort Collins Stormwater Utility Jeff Hill; City of Fort Collins Water / Wastewater Page 5 Project No: 1760-01-00 December 26, 2001 Re: Cherokee Flying Heights; Fort Collins, Colorado Responses To Comments, Comments Dated September 4, 2001 Water / Wastewater 21. Reduce proposed water main from an 8-inch to a 6-inch at the intersection of the private drive and future Pennsylvania Street. R As requested, the water main has been reduced in size from 8 inches to 6 inches in diameter. 22. Use a 6-inch 90-degree fitting at the end of the private drive. R As requested, the fitting has been added to the utility plans. 23. As previously indicated, maintain a 4 feet minimum separation between the outside wall of the meter pit and all building envelopes. R The separation between the water meter pit and buildings is 4 feet. 24. Show locations of gas and electric on the overall utility plan. R Gas and electric are shown sharing a common trench on the Typical Street Sections Plan, sheet 7. These lines are not shown on the overall utility plan. In our opinion, showing these items would add unnecessary complexity. 25. As previously indicated, pothole existing water main located in Taft Hill Road and provide pothole information on these plans. R With all due respect, we feel that potholing in Taft Hill Road at the design phase is an unnecessary expense and a burden to the City of Fort Collins transportation system. We have experienced this situation in the past and have accommodated with additional construction note directives. We would refer you to our handling of a similar situation with Lots 1-2, Block 5, Replat (No. 1) of Evergreen Park. Construction directives were satisfactorily accommodated during construction. R Construction Note No. 2 on the Master Utility Plan states that verification of the horizontal and vertical location of the sanitary sewer, and therefore the requirement of lowering the water line shall be determined in the field during construction activities. This shall be coordinated, if necessary, with Shear Engineering Corporation at that time. A note on the "Street and Utility Plan and Profile" sheet cross-references the note above. That portion of the Mater Utility Plan sheet presenting Note No. 2 is attached to this document for immediate reference. This same procedure was coordinated and found acceptable by Mr. Roger Buffingtonfor the fire line installation on Blue Spruce with Lots 1-2, Block 5, Replat (No. 1) of Evergreen Park. We have included a print of the Master Utility Plan for Lots 1-2, Block 5, Replat (No. 1) of Evergreen Park for immediate reference. Page 4 Project No: 1760-01-00 December 26, 2001 Re: Cherokee Flying Heights; Fort Collins, Colorado Responses To Comments, Comments Dated September 4, 2001 2. Please clarify the release rate for the pond at the 100-year WSEL and make sure the rating curve is consistent with calculations. The orifice calculations show the 2-year rate of 0.79 cfs as the release and the rating curve says 1.15 cfs. R The release rate has been re-evaluated and corrected on both the drainage plan and the calculations. The rating curve is consistent on both the Master Drainage and Erosion Control Plan, and with the Final Drainage and Erosion Control Report. The 2-year release rate for a 100 year storm is 0.79 cfs, and agrees with the rating curve. 3. Please provide more stages for the pond -rating curve and document the WQSEL and 100- year water surface elevation. The volume for the water quality pond should be in addition to the water detention volume. Please explain in the text the proposed design for the site. R Additional stages for the pond -rating curve have been calculated and are provided on both the Master Drainage and Erosion Control Plan, and the Final Drainage and Erosion Control Report. The WQSEL of 5068.33 feet, and the 100 year WSEL of 5071.82 are presented. The 100 year WSEL includes both water quality storage plus detention storage. Calculations and discussions thereof are provided in the drainage and erosion control report. Text has been added clarifying the proposed design. 4. Please provide 1-foot of freeboard for the detention pond. If this site does not allow for the total amount of freeboard, then explain the circumstances and document a need for a variance in the text of the report. R One foot of freeboard is not possible for the site. However, 0.18 foot is provided. The site does not allow for one foot of freeboard, since all surrounding properties are developed. Site drainage is constrained by the surrounding properties. Text is included in the report, Section VII.A.1, addressing the need for a variance. Text, as taken from that section states: "The water quality/detention pond at the southeast end of the site has a maximum WSEL of 5071.82, which allows for only 0.18 feet of freeboard to the top of the retaining wall. This is much less than the required 1.0 feet of freeboard according to section 9.2 of the City of Fort Collins Storm Drainage Design Criteria and Construction Standards manual. Since all land surrounding the site is developed, there are grading constraints around the perimeter of the site. Due to these constraints, it is impossible to provide the minimum of 1.0 feet of freeboard required for detention ponds. Therefore, a variance from the City of Fort Collins requirements is requested. " 5. Please use a well screen instead of the gravel filter for the water quality outlet structure. R A well screen has been incorporated into the design as requested. Please reference the Master Drainage and Erosion Control Plan, outlet structure detail. Additional detail is provided on the Drainage and Erosion Control Detail Sheet, sheet 14 of 14. Specifications for the well screen have been provided in the report. Page 3 Project No: 1760-01-00 December 26, 2001 Re: Cherokee Flying Heights; Fort Collins, Colorado Responses To Comments, Comments Dated September 4, 2001 OBLIGATION TO ACCEPT SUCH STREETS AND/OR DRIVES AS PUBLIC STREETS OR DRIVES." R Acknowledged. The text as requested has been added to the plat as note 7 on Sheet 2 of 2. Technical Services 2. Original needs to be of clear quality to reproduce. Text could be larger. R Acknowledged. Our opinion is that the plat is currently legible, of clear quality and acceptable. Transportation Planning 5. Site plan needs to show walkway connections from the building entrances to the sidewalk system. R Walkway connections between the sidewalks and building entrances are now provided. Stormwater Please provide documentation on pumping system and describe in text of the report how pump will function with outlet system. Include pump literature and all accessories needed in order to operate the system. Also, please show pump on all outlet structure details in the plan set. R Pump information is provided in Section VI.B.5 of the Final Drainage and Erosion Control Report. Text, as taken from that section states: "A sump pump will be required to transport nuisance flows from the water quality box structure to the upper orifice. The only requirement for the sump pump is to pump the specified WQCV (1,864 cubic feet) over a 40-hour time period Therefore, the pump must transport 0.0129 cfs or approximately 6 gpm. The pump specified for this project is a 4" submersible pump designated 5-50R from Aermotor. The pump can transport water at approximately 9 gpm. Specifications and a rating curve for this pump are found attached to this report in Appendix III. " R Pump literature is included in Appendix III "Pump Specifications. " The pump is represented on the Master Drainage and Erosion Control Plan, within the outlet structure detail. Should additional information and/or detail be required, we would appreciate the opportunity to discuss and provide directly so that additional written comments and an additional resubmittal can be avoided Page 2 December 26, 2001 Project No: 1760-01-00 City of Fort Collins, Current Planning P.O. Box 580 281 N. College Ave. Fort Collins, Colorado 80524 Attn: Cameron Gloss Re: Cherokee Flying Heights; Fort Collins, Colorado Responses To Comments, Comments Dated September 4, 2001 Dear Mr. Gloss, This is a response to review comments concerning the Final Utility Plans and Final Plat for Cherokee Flying Heights dated September 4, 2001. These responses address utility plan and final plat review comments. Original comments and responses are provided to applicable technical concerns. Engineering 9. A (new) low spot appears to be created along the parking area on the south side of the private drive. Is this intended? R Grading has been modified, and the low spot as previously presented has been removed. Surface drainage from the parking areas south of the private drive, is north to the gutter and flows east to the cross pans. At that point flows continue south into the detention pond. Site sections have been modified to reflect the same modification. 10. The plan set shows unreadable contours. It would still be preferred if the utility plan drawings were enlarged to a 30 or 20 scale. R Acknowledged. All labels have been revisited and changed appropriately to make more legible. These changes have been made, while retaining the same scale. 30. Private Drive note is needed on the plat. Add the following note (as attached to the utility plan copy of the plat): "ALL RESPONSIBILITIES AND COSTS OF OPERATION, MAINTENANCE AND RECONSTRUCTION OF THE PRIVATE STREETS AND/OR DRIVE LOCATED ON THE PRIVATE PROPERTY THAT IS THE SUBJECT OF THIS PLAT SHALL BE BORNE BY THE OWNERS OF SAID PROPERTY, EITHER INDIVIDUALLY, OR COLLECTIVELY, THROUGH A PROPERTY OWNERS' ASSOCIATION, IF APPLICABLE. THE CITY OF FORT COLLINS SHALL HAVE NO OBLIGATION OF OPERATION, MAINTENANCE OR RECONSTRUCTION OF SUCH PRIVATE STREETS AND/OR DRIVES NOR SHALL THE CITY HAVE ANY 4836 S. College, Suite 12 Ft. Collins, CO 80525 (970) 226-5334 Fax (970) 282-0311 www.shearengineering.com