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HomeMy WebLinkAboutGOOD SAMARITAN VILLAGE - PDP - 27-96B - CORRESPONDENCE - REVISIONS (5)and we have included the peak discharge as conveyed from each basin by the respective conveyance element. Table 2 in the report provides the associated Conveyance Element with the various runoff rates. II. Will the Tracts on the plat be designated as access, drainage, and utility easements? If so, please denote this on the plat? If not, please provide drainage easements for all the drainage facilities. Also, please show the off -site drainage easements near the northwest corner of the site on the plat. RESPONSE: The whole site is designated as an access, drainage and utility easement. Preliminary off -site easements are' provided with submitted drainage report. Finalized easements will be provided under separate cover prior to the P&Z meeting (approved by Bob Blanchard — City of Ft. Collins, 5/25/99). 12. Please provide water quality volume calculations for Pond 53. Water quality volumes should not be considered for detention volumes. It is a concern that if the 100-year WSEL of Pond 53 increases, backflow will occur out of the northern most inlet on Constellation Drive. Please address these concerns. RESPONSE: Water quality calculations for Pond 153 are provided for pre -development and construction periods, and are included with the Erosion Control Report under separate cover. No water quality calculations were performed for fully developed conditions as the entire site will be sodded, paved and landscaped such that the little or no sediment transport will occur. With respect.to water backing up into the northernmost inlet on Constellation Drive, the storm system has been designed to accommodate full conveyance and detention up to the 100-year storm. Essentially, Pond 53 will accept total site runoff, with no surcharging or backwater occurring that will escape to Constellation Drive. As such, no release of sediment or otherwise is anticipated. Erosion/Sediment Control Comments Plan is OK. RESPONSE: Alright. Discussions between Kim Lambrecht (Landmark) and Troy Jones (City Planning) indicate that no copy of the erosion control report will be necessary for this specific submittal. Copies will be provided with the final submittal. Please refer to redlined plans and report for additional review comments. Plan/report redlines have been identified, and addressed. QUandmark Ltd. 3521 W. Eisenhower Blvd. Loveland, Colorado 80537 Phone: 970.667-6286 FAX: 970-667-6298 Email: Indmrk@rmi.net 5. Please show all utilities that cross the storm sewers at the site. Water lines that cross under or within 18" over any storm sewers should be concrete encased. RESPONSE: . All utility crossings are now identified on the drawings, and are in accordance with City criteria. 6. Please do not calibrate the developed SWMM using the given tables. Instead, please base the SWMM parameters on the actual physical conditions at the site. In particular, please adjust the overland flow lengths at the site. RESPONSE: No calibration is incorporated in this SWMM submittal. Discussion in the report merely states that no calibration to unit peak discharge rates was performed. 7. Please use the invert of the outlet as the starting elevation for the rating curves of the two detention ponds. In addition, please use all of the calculated storage -discharge points in the SWMM runs. Also, please use a width of 0 or 0.1 for the outlet pipe of both detention ponds in SWMM, since the rating curve dictates the discharge. RESPONSE: Oops, appropriate inverts are now on rating curves for ponds. All S-Q points are now in the curves. Pipe widths have been modified to reflect discharge via rating curves. 8. The SWMM output indicates that the storm sewers are surcharging in the 100-year event. Please provide some means in the SWMM to alleviate this problem (i.e., overflow components, enlarged storm sewers, etc.). RESPONSE: Overflow elements have since been added to the models. Rerun of SWMM models now indicate no surcharging within the storm lines. 9. Please provide 100-year HGL's on each storm sewer profile in the plans and show the calculations in the report. RESPONSE: 100-Year HGL's are provided on the drawing set. 10. The drainage summary tables on the drainage plan and in the text do not appear to match the SWMM output. Please clarify these values and make the necessary changes. RESPONSE: Summary tables in previous submittal are taken from the hydrograph summary for each basin, representing the peak discharge for each on -site basin. This was a misunderstanding on our part, Landmark Ld. 3521 W. Eisenhower Blvd. Loveland, Colorado 80537 Phone: 970-667-6286 FAX: 970-667-6298 Email: lndmrk@rnv.net Stormwater Comments (Aprll 28, 1999) The portion of basin 11 that includes the north side of Trilby Road appears to direct flows to Constellation Drive (basin 43), instead of to pond 51a. Please verify the flow patterns and make any necessary changes to the plans and calculations. RESPONSE: The delineation of basin 11 has been modified to reflect that correct drainage patterns along Trilby Road to Constellation Drive. Flow patterns are now revised to reflect the new delineation. This change is also reflected in the SWMM. 2. What happens if the inlets in basins 21, 22, 41, and 42 are clogged? Where will the flows be directed? Please refer to Section 7.4 of the Storm Drainage Design Criteria for more information. Streets can be used for overflows, as long as adjacent buildings are at least 1' above the overflow elevation. RESPONSE: SWMM analysis incorporating plugged inlets indicate that backwater will not adversely impact adjacent structures, and will be over the i' freeboard required between the 100-year WSEL's and lowest first floor elevations. Discussions of backwater conditions for plugged inlets is provided in the drainage report text. 3. The buildings in the north portion of basin 32 would seem to drain into the adjacent street, yet the basin delineations indicate flows will be directed to the Swale in basin 32. Should the flows be directed to the streets? If so, please make the appropriate basin changes. If not, please show how the flow will be directed to the swale. RESPONSE: Correct. The delineation of basin32 has been modified to reflect the proper flow paths. Flows associated with this change are now directed to the interior street. These changes are also reflected in the SWMM. 4. Please provide 10' of clearance between storm sewer SD-1 and the 6" water line in the southwest corner of the property. RESPONSE: The 6" water line is to be abandoned at the time that the 8" replacement water line becomes operational. While this was noted on the most recent construction drawing set submitted, notation of the 6" water line to be abandoned is provided on an additional demolition plan sheet provided with this submittal. Landmarh U.. 3521 W. Eisenhower Blvd. Loveland, Colorado 80537 Phone: 970-667-6286 FAX: 970-667-6298 Email: Indmrk@rrni.net • You will need to provide a design of the landscaped median along Trilby Road. A landscaped median design is provided in the construction set. • Address all of the comments from the last submittal. Hopefully, we've got them all. • You will need to submit cross sections of Trilby Road with your next submittal. Cross sections are provided with this construction set, as well as the appropriate road detail. Landmark L. 3521 W. Eisenhower Blvd. Loveland, Colorado 80537 Phone: 970-667-6286 FAX 970-667-6298 Email: Indnuk@mu.net Engineering Department • You will need to provide a plan and profile sheet for Constellation Drive. Constellation needs to be brought up to City standards including curb, gutter and sidewalk Plan and profile sheets are included for Constellation Drive. However, during this most recent submittal a variance request related to minimum street standards for Constellation Drive was submitted to the City. While ultimately denied, this notice came at such a time that any changes would require, additional time to integrate into the overall design package. This issue was relayed to Mr. McNair. Further, Mr. McNair will be providing specific direction as to how best to tackle the design issues associated with the requested variance. Final improvements along Constellation Drive will be submitted in the final compliance package, per the direction of Engineering. • Include the maintenance and guarantee notes on the plat. Refer to the attached sheet. Revisions have been made to the plat. • Incorporate the new plat language on the plat. Refer to the attached sheet: Revisions have been made to the plat. • You will need to dedicate a 9-foot utility easement along Constellation Drive per City standards. The entire site is one easement dedicated to residential units and other buildings, private drainage, landscape, public vehicular and pedestrian access, signage, and public and private utilities. 6 You will need to dedicate a 15 foot utility easement along Trilby Road per City standards. The entire site is•dne easement dedicated to residential units and other buildings, private drainage, landscape, public vehicular and pedestrian access, signage, and public and private utilities. • Remove 'Tract B' from the plat and simple label it as 'ROW to be dedicated with this plat'. Revisions have been made to the plat. • You will need to submit any offsite easements to the City for review and acceptance. Filing fees will be required once those figures have been determined. Off site easements related drainage release at the northwest comer of the site is currently being negotiated between the Client and an adjacent landowner. Attached with the drainage report are copies of the draft agreement. Final easement agreements are expected to be received prior to the June 17ei P&Z meeting, and will be forwarded under separate document when finalized. • Provide a signing and striping plan for "Trilby Road showing the existing and proposed signing and striping. Signing and striping are in the plans now. Landmarh LW. 3521 W. Eisenhower Blvd Loveland, Colorado 80537 Phone: 970-667-6286 FAX: 970-667-6298 Email: Indmrk@nni.net d. Engineering must also be provided a copy of the documentation of the off -site stormwater easement. The acquisition of the off -site stotmwater easement is still being negotiated between the two parties. A draft of the easement documentation is included in the Drainage Report. 3. Current Planning: a. The project has been tentatively been scheduled for the May 20, 1999 Planning and Zoning Board hearing provided you can satisfy staffs concerns and supply PMT's and renderings to us by Tuesday May 4`". We will bypass this P&Z hearing, and be prepared for the June 17 hearing. Landmarh L.. 3521 W. Eisenhower Blvd Loveland, Colorado 80537 Phone: 970-667.6286 FAX 970-667-6298 Email: Indmrk@rmi.net RESPONSE TO STAFF COMMENTS Fort Collins Good Samaritan Village May 28, 1999 COMMENTS: 1. Transportation Planning: a. S foot sidewalks on the interior of the site are OK. Thank you for accepting our proposal. b. You still need to provide bicycle parking in the front of the existing building. Additional bicycle parking has been provided at the front of the existing building. c. You need to provide striped pedestrian crosswalks at the 3 locations where the western private drive has parking lot driveway access points. The first being the parking lot access on the south sided of the existing building, the second being the first parking lot entrance on the parking lot west of the existing long term care facility, and the third being the driveway access to the maintenance an service building. Striped pedestrian crosswalks have been shown on the drawings at the three locations mentioned above. d. Whatever you workout with Tim Blandford on the design of the Trilby island/median pedestrian safe area will satisfy transportation's concerns for the crosswalk A landscaped median with pedestrian area of refuge has been added to the drawings as coordinated with the Engineering Department. 1. Stormwater: a. You have satisfied all their concerns that are required to be address prior to the P&Z hearing, however you will need to follow up on a few issues for final compliance. Further stormwater concerns have been addressed later in this document. 2. Engineering Department: a. All on site easements (including stormwater ponds) must be dedicated on the plat. The entire site has will be dedicated as an easement for buildings, drainage, utilities, etc. b. Stanley Dunn from Landmark and Tim Blandford are going to meet on Friday 4130 to discuss the requirements for Trilby Rd cross sections and the Trilby median island Results of the meeting are reflected in the drawings, and in subsequent correspondence with the Engineering Department. c. The variance request has been approved by Cam McNair, the City Engineer. Thank you for considering our request. '' Landmarh Ltd. 3521 W. Eisenhower Blvd. Loveland,,Colorado 80537 Phone: 970-667-6286 FAX: 970-667-6298 Email: lndmd4rmi.net