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HomeMy WebLinkAboutPOUDRE SCHOOL DISTRICT 2004 HIGH SCHOOL - SITE PLAN ADVISORY REVIEW - 43-01A - CORRESPONDENCE - REVISIONS (3)June 24, 2002 FC019400 Mr. Ted Shepard Senior Planner Current Planning Division City of Fort Collins 281 N. College Ave. Fort Collins, CO 80524 BE Y O N D E N G IN E E R ING SUBJECT: Response to City of Fort Collins Comments dated April 03, 2002 Webster Farm — Proposed 2004 High School Site Plan Advisory Review, #43-01A Dear Mr. Shepard: This letter is in response to the comments received from the City of Fort Collins and other entities. Specific responses are in the order of each comment sheet for each city department and reference the note number where applicable. Fort Collins -Loveland Water District / South Fort Collins Sanitation District — Response • Easement documents will be prepared after installation to depict accurate location of these utilities. • We will continue to meet and coordinate with the District for water and sewer approval. Engineering Department -Responses Bridge Structure: 63 A design of the boxes across Cambridge is required on the utility plan drawings with structural calculations from a structural engineer prior to sign off on the plan set. [4/3] Structural calcs have not been received. The structural calcs are required to be in the form of a sufficiency rating as specified in LCUASS 11.2.2. Response: Structural calculations are included as part of this submittal. 69 There is a concern on the culvert design regarding the drainage flow as it approaches the structure. The direction of flow is not perpendicular to the culverts; this combined with the grading of the NOLTE ASSOCIATES, INC. 1901 SHARP POINT DRIVE. SUITE A FORT COLLINS, CO 80525 970.22 1 .2400 TEL 970.221.2415 FAX WWW.NOLTE.COM Mr. Ted Shepard June 24, 2002 Page 12 81 Please provide 10-feet separation between trees and all storm sewers. Response: Noted on plans 82 The storm sewers in the private drives need to be in a 20-foot drainage easement, or have the street be public. This is needed due to the main storm sewer down the private drive conveying flows for the future offsite drainage. Response: A 20-foot easement document (legal description and exhibit) has been provided to Poudre School District for the main storm sewer down the private drive for their recordation. 79 1. Where are the PS, EFF, surety, etc. calculations? 2. Where is the erosion/sediment control plan? Response: The PS and EFF calculations have been included in the drainage report. The Grading and Erosion Control Plan has been included in this submittal. Thank you for your review and final approval of these plans and responses. If you need further clarification on any of the above responses, please call me (419-1316) at your convenience. Sincerely, Nolte A 'ates, Inc. Thomas Ochwat, P.E. Senior Engineer NOLTE ASSOCIATES, INC. Mr. Ted Shepard June 24, 2002 Page 11 Stormwater Utility Department - Responses Drainage 75 The future commercial lot (sub -basin 500) does not have a designated outfall for when it develops. Please provide an outfall from within the high school site to the future property line of the commercial lot. See sheet DRO1. Response: Basin 500 and 501 are currently divided along and existing irrigation ditch. There has been no property line defining whether one or more lots will be made. Our current understanding is that only one proposed lot would be constructed, therefore we have allowed only one outfall connection. The outfall at design point 501 is designed to accept historic flows (0.50 cfs/acre) from both basins. 76 Please provide more documentation for the minor -storm street calculations and revise where necessary. A random calculation using flow master produced different results. Also, the 2-year storm can be used as the minor storm for local and collector streets. The City uses the 10-year storm for just arterial streets. Response: Section 3. Hydrology Standards of the City of Fort Collins Stormwater Utility Criteria states in part 3.1.3 that for Public Building Areas the initial storm design frequency shall not be less than the 10-year return period. 77 Please document how the flow was obtained in the swale at design point 308. See drainage report. Response: These flows were obtained from the mechanical engineer. The roof runoff was obtained using the UPC standards of 3 in/hr and equated to 15.75 cfs. This number was added to the runoff calculated for Basin 308. This is now documented in the drainage report. 80 Due to the size of the basin and the extra freeboard of the detention pond, please multiply the calculated detention volume by 1.5 instead of 1.25 if SWMM is not to be used. This is for extra assurance that the detention pond will give adequate protection downstream. This will result in raising the invert of the spillway a small amount, which should still allow for plenty of freeboard. Response: The FAA method was used to calculate the detention volume required for the site. This value was multiplied by 1.5 to allow additional assurance for detention volume that would be similar to a SWMM computation. The supporting calculations are included in the drainage report. NOLTE ASSOCIATES, INC. W. Ted Shepard June 24, 2002 Page 10 24 [UT 01-02] There are dedicated right-of-way "stubs" on Rock Creek Drive (at the termination of Technology Parkway) and on Cambridge Avenue (two locations) that should be vacated with 9' being retained for utility easement. The process should begin to vacate these right-of-way portions, with legal descriptions submitted to the City. [4/3] This comment will be left as unresolved until the information is provided. Response: Noted and providing the legal description and related exhibits to the Poudre School District for their use. 25 [UT 01-02] There does not appear to be existing right-of-way along the eastern part of Ziegler Road to complete the roadway improvement started with Harvest Park/Sage Creek. Please provide the necessary deeds of dedication and legal descriptions to dedicate the right-of-way. Ideally, these deeds of dedication should be submitted to the City prior to mylar signatures. (Please note that there are still deeds of dedication that have not been given to the City for the Staley Elementary School site.) [4/3] This comment is left as unresolved until the deeds and legals are provided. Response: Noted. Dedications adjacent to the park have been addressed. 26 [UT 01-0219' of utility easement behind the right-of-way exists along Rock Creek Drive and most of Cambridge Avenue (Reception #2001085365) which was acquired with the Willow Brook development. 15' of utility easement on Ziegler & Kechter Road and 9' of utility easement along the curved portion of Cambridge is required to be dedicated behind the right-of-way in accordance with the Larimer County Urban Area Street Standards (LCUASS). Legal descriptions along with deeds of dedication for these easements dedicated to the City should be provided prior to final sign off on the mylars. [4/3] This comment is left as unresolved until the deeds and legals are provided. Response: Noted. Park Site dedications have been submitted for review. 74 Please ensure that the plans by indicating and shading distinguishes between: -proposed by PSD (solid) -existing (faded) -proposed by Village Homes (dashed?) Response: Noted. NOLTE ASSOCIATES, INC. Mr. Ted Shepard June 24, 2002 Page 8 [4/3] This comment will be left as unresolved until drawings have been submitted. Response: Noted. 43 All driveways out to Rock Creek, Ziegler, & Cambridge are limited in the amount of drainage that can enter the public street from the driveway. With the exception of the driveway out to Cambridge, which has inlets, the other driveways may not exceed the maximum of 500 square feet as specified under LCUASS 9.4.1IA. (Additional detail is needed on the grading plan with spot elevations to help discern this.) [4/3] In response to the variance request submitted by Nolte on 3/11/02, the City Engineer has issued a letter dated 4/3/2002. This states that the City Engineer is supportive of the variance request to allow the design of the drainage off the driveway out to Ziegler as proposed. Response: Noted. 48 [RD 011 The driveway out to Cambridge shows 30' corner radii. 15' corner radii are the maximum allowed to intersect a collector street in accordance with the Larimer County Urban Area Street Standards (LCUASS). A variance request to the City Engineer is required to vary the standards. Because this driveway was not intended for normal school bus operations and the smaller radii would decrease speeds at this intersection, the City's Transportation group does not see a compelling reason to allow for the larger radii. [4/3] In response to the variance request submitted by Nolte on 3/11/02, the City Engineer has issued a letter dated 4/3/2002. This states that the City Engineer does not support the use of 30' corner radii for the driveway out to Cambridge and will only support 15' radii for the driveway entrances as required under LCUASS. Response: Noted and addressed see sheet HC05. 50 [RD 02-03] The driveway out to Ziegler shows 30' corner radii. 20' corner radii are the maximum allowed to intersect a collector street in accordance with the Larimer County Urban Area Street Standards (LCUASS). A variance request to the City Engineer is required to vary the standards. Because this driveway was not intended for normal school bus operations and the smaller radii would decrease speeds at this intersection, the City's Transportation group does not see a compelling reason to allow for the larger radii. [4/3] In response to the variance request submitted by Nolte on 3/11/02, the City Engineer has issued a letter dated 4/3/2002. This states that the City Engineer does not support the use of 30' NOLTE ASSOCIATES, INC. Mr. Ted Shepard June 24, 2002 Page 7 38 The improvements along Cambridge Avenue that were approved with Willow Brook appear to have some issues with the improvements proposed on the plan set and are listed following. In general, revisions to the Willow Brook plan set should be submitted to the City for the improvements shown on these plans that were not shown on Willow Brook. While Cambridge Avenue is shown as a phase 2 improvement for Willow Brook and may not be constructed as soon as Rock Creek Drive, it was my understanding that there may be agreements between PSD and the Willow Brook developer regarding the construction of Cambridge Avenue which should then be revised on the Willow Brook plan set. [4/3] This comment will be left as unresolved until drawings have been submitted. Response: Noted. TST Consultants have been retained to provide the street design for the full width street section. 39 Cambridge Avenue on the Willow Brook plan set adjacent to Willow Brook does not specify the construction of the 8' parking lane on the west side of the roadway. It would appear to be beneficial if the entire roadway from curb to curb was built at once with both sides of the street now being developed. The Willow Brook plan set would need to be revised to reflect the full width construction. If Willow Brook constructs Cambridge as currently shown on the plan set, the addition of the parking lane and curb and gutter at a later date may require saw cut removal of a portion of the then existing roadway in accordance with street cut criteria and would become more expensive rather than the construction of the entire roadway at once. [4/3] This comment will be left as unresolved until drawings have been submitted. Response: Noted. TST Consultants have been retained to provide the street design for the full width street section. 40 The Willow Brook plans for Cambridge Avenue specifies two street stubs on the west side of the roadway that are no longer being reflected on the school site. This should also be revised on the Willow Brook plan set. [4/3] This comment will be left as unresolved until drawings have been submitted. Response: Noted and will be revised with the TST street construction plans for Cambridge Avenue. 41 The utility plan set [OL05] specifies a type R inlet where a street stub is currently proposed on the Willow Brook plan set. Willow Brook's plan set should be revised accordingly. NOLTE ASSOCIATES, INC. Mr. Ted Shepard June 24, 2002 Page 6 Response: Noted. 34 A revision to Willow Brook's striping plan should be submitted in order to reflect the change in striping by having full turning movements out the westernmost driveway out to Rock Creek Drive. [4/3] This comment will be left as unresolved until drawings have been submitted. Response: Noted and the involved parties have been informed through several coordination meetings. 35 The eastern leg of Rock Creek Drive along the Ziegler Road/Rock Creek Drive intersection was not designed by Willow Brook as a permanent improvement and was designed with temporary paving to transition into the existing portion of Ziegler Road. The utility plans should show an ultimate design of this area, which ties into the improvements proposed on Ziegler Road. [4/3] This comment will be left as unresolved until drawings have been submitted. Response: Noted and the involved parties have been informed through several coordination meetings. 36 The Willow Brook plan set shows construction of the street stub to continue Technology Parkway south of Rock Creek Drive. The Willow Brook plan set should be revised to show the roadway continuing straight across at this point before Willow Brook builds this roadway. [4/3] This comment will be left as unresolved until drawings have been submitted. Response: Noted and coordinated. 37 Just west of the eastern driveway out to Rock Creek Drive and just west of the Rock Creek Drive/Cambridge intersection, the plan set specifies the installation of Type R inlets. Again, it would be beneficial to have this reflected on Willow Brook's plan set before the roadway is constructed without these inlets and street cut penalty fees would be levied. [4/3] This comment will be left as unresolved until drawings have been submitted. Response: Noted and the involved parties have been informed through several coordination meetings. NOLTE ASSOCIATES, INC. Mr. Ted Shepard June 24, 2002 Page 5 the Rock Creek Drive improvements, it would appear to be beneficial to have the Willow Brook revisions made soon: [4/3] This comment will be left as unresolved until drawings have been submitted. Response: Noted and the involved parties have been informed through several coordination meetings. 31 Both driveways out to Rock Creek Drive are not reflected on the approved Willow Brook plans. Ideally, the Willow Brook plans should be revised to reflect the driveways in order to prevent construction by Willow Brook without the drive entrances -- street cut penalty fees would be levied if the driveway cuts were made later. [4/3] It was agreed that these driveways would be designed on Nolte plans and left off TST drawings. Care must be exhibited when making the driveway cuts as street cut penalty fees would be levied if damage to the asphalt occurs. Response: Noted and the involved parties have been informed through several coordination meetings. 32 Both driveways out to Rock Creek Drive appear to show 30' corner radii. 15' corner radii is the maximum allowed to intersect a collector street in accordance with the Larimer County Urban Area Street Standards (LCUASS) (Table 8-2 and 8.2.9A). A variance request to the City Engineer is required to vary the standards. [4/3] In response to the variance request submitted by Nolte on 3/11/02, the City Engineer has issued a letter dated 4/3/2002. This states that the City Engineer does not support the use of 30' corner radii; though will support 25' radii for the driveway entrances out to Rock Creek Drive. Response: Noted and 25-ft. radii are reflected on HCO1 and HCO2. 33 The westernmost driveway out to Rock Creek Drive does not appear to have pavement in front of it to allow for left turn movements; the Willow Brook plan set specified that the center portion of the roadway east of the Rock Creek Drive/Ziegler Road intersection for a distance of over 600 feet would not have pavement. Pavement should be added along this stretch (and perhaps landscaping if interested.) Ideally, Willow Brook plans would be revised to reflect the changes before Willow Brook constructs the plan set as currently shown. [4/3] This comment will be left as unresolved until drawings have been submitted. NOLTE ASSOCIATES, INC. Mr. Ted Shepard June 24, 2002 Page 4 as a public access and emergency access easement should be submitted prior to mylar sign off on the plan set. [4/3] In conversation with the Parks Department, they are supportive of this private drive needing to be dedicated as an access and emergency access easement. Again, these documents should be submitted prior to mylar sign off on the plan set. Response: The Poudre School District will be providing these documents. 68 In general, there are comments that were made last round, which the design engineer responded that TST would coordinate. This coordination should be made prior to final sign off on the plan set. Please note that there may be some disagreement as to Nolte/TST responsibilities based upon an email sent by the Planning Manager for Village Homes dated 4/4/02. Response: Noted Groundwater 29 [DR 05] There is a concern that the detention/irrigation facility may result in additional water collection via groundwater. The soils report indicates a boring (B-29) nearby with groundwater encountered at 8' below the existing surface. Because the detention/irrigation pond could possibly draw down this groundwater, a professional engineer should verify that any adjudicated water rights to property owners are not being harmed by this design. A report similar to the requirements in LCUASS 5.6.2 should be submitted. [4/3] The response indicates that this will be addressed via a pond liner for the pond. There did not appear to be any indication on the plan set that a liner would be used. Please ensure that this is indicated on the plan set along with material/type details. Response: Noted. A meeting with the State Engineer has occurred and a proposed clay liner is acceptable. The pond grading has been revised to reduce the potential of inter- mingling of irrigation water and groundwater. Cross-section of the pond wall is shown on sheet PD03-36. Street design 30 The improvements along Rock Creek Drive that were approved with Willow Brook appear to have some issues with the improvements proposed on the plan set and are listed following. In general, revisions to the Willow Brook plan set should be submitted to the City for the improvements shown on these plans that were not shown on Willow Brook. Because Willow Brook may shortly begin on NOLTE ASSOCIATES, INC. Mr. Ted Shepard June 24, 2002 Page 3 General 49 [RD 01, Site and Landscape Plan] A sight distance easement is needed for the driveway entrance off Cambridge Avenue in accordance with LCUASS Standard Drawing 7-16. This is sketched out on the Landscape Plan. Please show this easement on the site, landscape, and utility plans, provide the standard note below regarding sight distance and provide the necessary deed of dedication to the City to record the easement. Please note the vertical requirements of a sight distance easement, including how fences are required to be no greater than 42 inches in height and do not obstruct the line of sight for motorists; there is a vertical crest along the travel of Cambridge in between the start of the sight distance easement and the driveway entrance that. The ballfield fence may need to be less than 42 inches in order to maintain the proper degree of visibility. Also note that conifer trees are not allowed in a sight distance easement and thus requires changes to the landscape plan. ----------Add the following note to the site, landscape and utility plans ---------------- Sight Distance Easement - The sight distance easement is an easement required by the City at some street intersections where it is necessary to protect the line of sight for a motorist needing to see approaching traffic and to react safely for merging their vehicle into the traffic flow. The following are requirements for certain objects that may occupy a sight distance easement for level grade: (1) Structures and landscaping within the easement shall not exceed 24 inches in height with the following exceptions: (a) Fences up to 42 inches in height may be allowed as long as they do not obstruct the line of sight for motorists. (b) Deciduous trees may be allowed as long as all branches of the trees are trimmed so that no portion thereof or leaves thereon hang lower than six (6) feet above the ground, and the trees are spaced such that they do not obstruct line of sight for motorists. Deciduous trees with trunks large enough to obstruct line of sight for motorists shall be removed by the owner. For non -level areas these requirements shall be modified to provide the same degree of visibility. [4/3] The response from the Engineer states that the creation of a 3-way stop at this intersection causes the sight distance easement to be removed. This is not the case. A sight distance easement is required regardless of any traffic control devices at an intersection and is still required here. Response: A variance request is being submitted. 61 The private drive that connects Cambridge Avenue with Ziegler Road needs to be dedicated as an emergency access easement for emergency access. In addition, because this roadway is shared with the future park development, the roadway should also be dedicated as a public access easement to allow legal public access. A legal description with a deed of dedication to the City of Fort Collins NOLTE ASSOCIATES, INC. Mr. Ted Shepard June 24, 2002 Page 2 channel prior to the culvert raises a potential concern of scouring at the structure and compromising the integrity of the structure. Why can't the channel be graded to be less circuitous to reduce potential scouring at the structure and the structure designed to be perpendicular to the flow? Additional measures to reduce scouring (rip -rap) may need to be investigated. The structural calcs previously mentioned should also address this potential scouring issue. Response: The culvert alignment is based on the 100-yr storm flow direction. It is anticipated that City Parks and Recreation Department will be making the creek improvements per the recommendations in the McClellands Creek Drainage Master Plan when this park site is developed. 70 Additional right-of-way along Cambridge will be needed along the east side to include all of the bridge structure (the additional right-of-way is evidently not needed on the west side as it is now owned by the City?) Response: The City of Fort Collins owns both sides of the bridge structure. 71 It should be verified what the utility needs are around the bridge structure, what amount of sleeving needs to be specified and whether utility easement is required outside of the right-of-way at the bridge structure. A utility coordination meeting is recommended to evaluate utility needs and ensure that the proper information is specified on the plan set. This should also include ensuring that irrigation lines are extended for irrigation of the landscape strip at the structure. Response: Additional sleeving has been added along Cambridge Avenue. Coordination with City Power has occurred and they will be making their utility crossings during road construction. 72 The sidewalk across the bridge structure needs to be widened out to 6' in order to meet separation requirements from a fixed structure. A transition should be shown from the 5' to the 6'. Response: Noted and plans have been revised to reflect this width. 73_ [CT02] The loading data on this sheet specifies HS-20-44, what is the "44"? Please note and label on the plans that LCUASS (11.2.4.13.2) specifies a requirement of HS-25. Response: The "44" designation refers to the year. Plans have been revised to reflect the requirement of HS-25. NOLTE ASSOCIATES, INC. Mr. Ted Shepard June 24, 2002 Page 9 corner radii for the driveway out to Ziegler and will only support 20' radii for the driveway entrances as required under LCUASS. Response: Noted and addressed see sheet HC04. 51 [RD 02-03] The design of Ziegler Road needs cross -sections at 50-foot intervals in order to verify that a constant cross -slope is being maintained from the existing edge of pavement to the proposed. Please use centerline stationing for the cross sections and have the centerline stationing shown on these sheets in order to form a basis of comparison between the cross -sections, saw cut line and flowline. [4/3] The submitted cross sections need additional labels: -elevation at the flowline -cross slope of existing roadway -cross slope of new road section It should be demonstrated with this additional information that the additional road widening results in a cross slope that is equal to or greater than the existing cross slope, though not exceeding 3% as required under LCUASS. Response: Noted. Elevations at the flowline and cross slope of the new road section are shown. The cross slope of the existing road does not appear as the improvements were designed to the plans prepared by Sear Brown for "Sage Creek/Harvest Park" dated 7-6-00 per the cities directions. 66 The additional widening shown with the cross sections demonstrates varying pavement widths. Because the road widening often falls within the wheel track of the through lanes or in the middle of the bike lane (neither are allowed) the additional widening needs to be shown as extended to the middle of the through lane. The patching note should still be left in place, as there may be some allowances to minimize this requirement in the field, however, the plans should be revised to show the additional road widening width. Response: Noted and addressed. Utilities 67 Provide Water/Sanitation District signature blocks where appropriate for their sign off. Response: Noted and addressed. Utility Plan NOLTE ASSOCIATES, INC.