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HomeMy WebLinkAboutSite Certifications - 01/07/2021Page 1 OVERALL SITE and DRAINAGE CERTIFICATION Commercial, Multi-Family and Subdivision Certification Form and Checklist Project Name: Date: Building Permit Numbers: (Commercial or multi-family) Per the requirement in Fort Collins Stormwater Criteria Manual (FCSCM) Chapter 3, Section 3.0 to certify as- built construction to the approved drainage and grading plans, please fill in all applicable items in this Certification Form for Commercial, Multi-Family and Overall Single Family sites. NOTE: several items must be verified during construction. A copy of the approved grading plan must be submitted with the as-built grading plan. (As-built elevations must be written in red next to the approved elevations.) •Use “Yes” for items completed as described. •Use “N/A” for items that are not applicable to the site being certified. •If any blanks are “No,” attach an explanation referencing the item number below. Attach an explanation or description of the as-built condition for any items listed or for anything not listed but shown on the approved construction plans. Provide an as-built redline or Mylar drawing with the following: I.Water Quality and Quantity Detention Basin - FCSCM Ch. 6 and 7 For multiple detention basins on a site, provide the following for each basin separately: A. Volume: As-built topographic verification is attached at 1-foot (or less) contour intervals and volume verification calculations for the water quality capture volume and the 100-year detention storage volume. 1. Detention basin topography was prepared by a professional land surveyor registered in the state of Colorado. 2.Both proposed and as-built contours are shown on the same plan sheet (dashed lines for proposed and solid lines for as-built). 3.All critical spot elevations as shown on the approved construction plans have been verified and the as-built elevations are shown on the plan sheet. 4.Stage-storage-discharge tables are provided on a separate document. 5.Verification that designed drain time is in compliance with Colorado Revised Statute § 37-92- 602(8) is attached and has been uploaded to the Statewide Compliance Portal (tinyurl.com/COCompliancePortal) for approval. Uploaded documents must include: a.The cover sheet from the approved drainage report b.The stamped certification page from the approved drainage report c.As-built topographic survey d.Stamped certification page from the Overall Site & Drainage Certification e.PDF output from the Stormwater Detention and Infiltration Design Data Speadsheet 11/19 Page 2 B.Water Quality and Quantity Detention Basin Grading: Attached is as-built verification that there is a minimum 2% positive fall into the concrete trickle pans or flow-line(s) from all areas in the bottom of the detention pond. If there is a “soft pan” in the flow-line, all areas still must meet the minimum 2% grade requirement. 1.Low Flow: Choose one of the following detention basin low flow options as applicable: a. Turf swale for low flow path in detention basin. There is a minimum 2% grade in the flow-line(s) of the detention basin. The flattest as-built grade is . b.Concrete pan for low flow in detention basin. There is a concrete pan installed that meets the grades as shown on the approved construction plans. (Show as-built spot elevations.) c.Soft pan for low flow in detention basin. •Verify and document the soft pan material gradation, trench width and depth - to be verified during construction by engineer. Picture documentation is preferred or engineer’s statement of visual inspection and compliance. (Choose one below.) o There is a soft pan with an underdrain installed that meets the design on the approved construction plans. (Show the underdrain grades, bedding material, geotextile, spot elevations, bends, cleanouts, etc.) o There is soft pan installed without an underdrain but there is a type A or B soil. The soil type must be documented by supplying verification from a registered professional geotechnical engineer. NOTE: Spot elevations are to be within 0.2 ft. +/-. 2. Side Slopes: The as-built side slopes of the detention basin have been calculated and are shown. Indicate the side slope with an arrow and a numerical value (e.g., 6.25:1). The maximum slope allowed is 4:1. Small areas of 3:1 may be acceptable, but slopes steeper than 3:1 must be stabilized or re- graded. Provide documentation if a variance was granted for steeper slopes during the design process. 3.Spillway: The following items must be field verified: a.The location of the spillway is indicated on the as-built plan. b.The width of the spillway is indicated on the as-built plan. c.The elevation(s) of the spillway is shown on the as-built plan. d.A concrete ribbon defines the location and grade of the spillway. e.There is downstream scour protection in the spillway as per the construction plans. Indicate type: (riprap size “D50” gradation and bedding type, geotextile, buried riprap with inches of bury, etc.). f.There are no obstructions in the spillway, such as trees, bushes, sidewalks, landscape features, rocks, etc. 11/19 Page 3 4.Outlet Structure: a.The orifice plate for the approved release rate is installed with the correct size and location of the orifice. b.The orifice plate for the water quality outlet is installed with the correct hole size, number of rows and columns of holes. c.The bottom hole on both the water quality and quantity outlets are at the bottom of the plate so no water ponds in front of the plate. d.The well screen is the correct material and is installed as shown on the construction plans. e.100-year overflow grate elevation is . (Elev. A on detail D-46) f.The top elevation of the water quality capture volume is . (Elev. B on detail D-46) g.Overflow grate is made of the correct material, has the correct bar spacing, is hinged at the top and bolted at the bottom. h.The bottom of the outlet box has no obstructions or misalignments that will cause it to retain runoff water and is sloped at 2% towards outlet. II.Channels/Swales - FCSCM Ch. 8, Sec. 2.0 and Ch. 9, Sec. 5.0 A. Capacity: The as-built capacity of all the major channels and swales has been verified. They meet or exceed capacity requirements shown in the approved drainage study for this project. 1.All swales are located within the drainage easements as shown on the construction plans. 2.Longitudinal slopes and side-slopes (cross-sections) have been verified. Design criteria requires longitudinal slopes of 2% min. (on vegetated swales) and side-slopes no steeper than 4:1. If these criteria are not met, the certification engineer will write a justification and propose mitigation for each instance or have the issues corrected. If variances to these criteria have previously been approved and are shown on the construction plans, no justification is needed. 3.As-built spot elevations on channels/swales are shown that correspond to spot elevations shown on the approved construction plans. 4.All permanent erosion control measures are installed as shown on the approved construction plans (e.g., drop structures, riprap, TRMs, etc.). (Include pictures and verification of the materials used as part of this verification.) 5.All pans, curbs, storm pipes or other appurtenances appropriately tie into each other in the system. (Pictures at tie-in points suggested.) 6.The minimum freeboard is provided for all channels and swales as shown on the approved construction plans or as identified in the approved drainage study. (Show the freeboard provided on the cross-sections as on the construction plan set or attached as separate documentation.) 7.The low flow portion of all channels or swales is clear of obstructions. (No landscaping, trees, shrubs, sod, etc. infringe on the low flow portion of channels or swales.) 11/19 No Major Channels or swales for this site Minor swales have less than 2% slope per approved Utility Plan design Page 4 III.Storm Pipes (aka storm drains) - FCSCM Ch. 9, Sec. 4.0 A. Storm Drain Pipe Capacity: The as-built capacity of all pipes installed on this project has been verified and meets or exceeds the capacity requirements shown in the approved drainage study for this project. 1.All storm drain pipe sizes and materials have been verified and are in conformance with the approved construction plans. (Indicate on the plan and profile sheets that they have been verified.) Material and size substitutions must be approved prior to installation. If a pipe size or material was changed during construction, the certification engineer must attach the approval documents or supply them with this certification. Approval documents must include a calculation documenting the capacity equivalency (equal or greater) of the substituted size. 2.The longitudinal slope of the pipe is as shown on the approved construction plans. The acceptable minimum slope is 0.4%. All slopes flatter than the designed slope on the construction plans must be justified with capacity calculations on an attached sheet. 3.The as-built invert elevations have been verified and are shown on the plan and profile sheets of the approved construction plans. B.Storm Drain Pipe Installation Requirements: All pipes are installed in accordance with the approved construction plans and construction specifications. 1.The minimum cover requirements for all pipes have been met as shown on the approved construction plans. These will be called out in critical locations. 2.All encasements and clearances as specified on the approved construction plans have been met. 3.Any specific joint types or construction methods specified on the approved construction plans have been met. (List on a separate sheet and attach to this certification.) IV.Concrete Pans - FCSCM Ch. 8, Sec. 2.0 A. Construction/Installation: All concrete pans have been constructed in accordance with the approved construction plans. 1.The concrete pans are the correct size/width as shown on the approved construction plans. 2.The longitudinal slopes of the pans are as shown on the approved construction plans. The certification engineer must justify or mitigate longitudinal slopes less than the minimum of 0.4% unless a flatter slope was approved and is shown on the approved construction plans. Provide mitigation or justification by separate document. 3.The cross-section of the pan is as shown on the construction plans. (Specifically, the pan cross- section is “V” shaped and meets the side slope shown on the detail.) 4.The concrete pans are a minimum of 6 inches thick without reinforcement and a minimum of 4 inches thick with a minimum of 6X6-W14xW14 reinforcement per detail D20B and D20C. (Provide documentation of the reinforcement used if different than shown on the details or on the approved construction plans.) 5.The spot elevations shown on the concrete pan(s) have been verified and are shown on the as- built drawings. 11/19 There are pipes with flatter slopes than designed, see markups and calcs There are pipes with flatter slopes than designed, see markups and calcs. There are pipes with flatter slopes than designed There are pipes with flatter slopes than designed. See attached markups and calcs. Some areas under parking stalls have shallow cover with tying into exist inlet at south. Just one concrete pan in parking lot Page 5 V. Storm Drain Inlets - FCSCM Ch. 9, Sec. 3.0 A. Construction/Installation: All storm drain inlets have been constructed in accordance with the approved construction plans and construction specifications. 1.The size and type of inlets are consistent with the inlets shown on the approved construction plan. Indicate by writing “Verified” on each inlet on the plan sheet or list on a separate document the inlet number(s), type and size (length). If the inlet installed is other than the one on the approved construction plan detail sheet, provide the name and source of the detail with justification for equal or better capacity. 2.The size of the inlet opening is consistent with the approved detail. (Check height and width.) 3.The elevation of the grate (if applicable) is at the elevation shown on the street profile or as indicated by a spot elevation on the construction plans. 4.The as-built invert elevations of all pipes entering and leaving the inlet are shown on the plan and profile sheets within construction tolerance of 0.2 feet. If substantially different, provide justification and capacity calculations to show the capacity is not affected or propose mitigation. 5.The as-built size of the inlet box is as shown on the construction plans or an explanation or justification is attached. 6.All Type C, R, 13 and 16 inlet covers are stenciled or stamped with the following designation (or an equivalent): NO DUMPING – DRAINS TO POUDRE RIVER. VI.Culverts - FCSCM Ch. 9, Sec. 4.0 A. Construction/Installation: All culverts have been constructed and/or installed in accordance with the approved construction plans and construction specifications. 1.All culvert sizes have been verified as indicated on the as-built construction plans as correct. 2.The culvert material type for all culverts installed is as on the approved construction plans and is indicated on the as-built plans. 3.The as-built invert “in and out” elevations have been verified and are indicated on the as-built construction plans. 4.The culvert headwalls or wing walls have been installed as shown on the approved construction plans. Headwalls or wing walls may be needed in the as-built conditions onsite if the slopes adjacent to the culvert are greater than 4:1. Please note areas needing stabilization in the certification narrative. An alternative to consider is a turf reinforcement mat (TRM). VII.Sub-Drains A. Construction/Installation: All sub-drains shown on the construction plans have been installed in accordance with those plans and the construction specifications. Sub-drains installed with the sanitary sewer are to be verified on the sanitary sewer plan and profile sheets of the construction plans. (NOTE: Indicate any sub-drains installed after the plans were approved on the as-built plans.) 1.The size of the sub-drains are as approved on the construction plans and are indicated on the as- built plans. 2.The type of sub-drain, in particular the perforated and non-perforated sections of the drain, are as indicated on the approved construction plans. 11/19 Inverts are different, see attached markup and calcs Page 6 3.The cover requirements per the construction plans are provided. 4.The cleanouts have been installed at the locations shown on the construction plans and are accessible for cleaning. (Cleanouts can be buried a maximum of 6 inches deep with their locations marked.) 5.The backfill materials for sub-drains are as shown on the approved construction plans. (This includes the type, depth and width.) 6.The geo-textile liner completely wraps the sub-drain and the permeable backfill material unless shown otherwise on the approved construction plans. (Sub-drain pipe wrapped in a sock filter material is accepted only if approved prior to installation.) VIII.Curb Cuts A. Construction: All curb cut openings are constructed in accordance with the approved construction plans and construction specifications. 1.The size (width) of the curb cut opening is as shown on the approved construction plans. 2.The curb cut openings tie into a downstream swale, pipe, or other appurtenances with a smooth transition and there no obstructions such as riprap or sod impeding the flow downstream of the curb cut. IX.Sidewalk Culverts & Chases A. Construction/Installation: All sidewalk culverts have been installed at the locations shown on the approved construction plans. 1.The size (width and length) of the culverts are as shown on the approved construction plans. 2.The cover plate is a minimum 5/8-inch galvanized plate bolted to a galvanized angle iron per the detail shown on the approved construction plans or per the City’s detail. 3.The sidewalk culvert invert “in and out” elevations have been verified and are indicated on the as-built plans. 4.The sidewalk culvert opening is as shown on the approved construction plans or per the City’s detail. 5.There is a smooth transition both on the inlet and outlet ends of the sidewalk culvert with no obstructions such as riprap or sod impeding the flow into or out of the sidewalk culvert. X. Site Grading - FCSCM Ch. 8 A. Construction: All common open spaces have been graded in accordance with the approved construction plans. 1.The grading on all common open spaces bordering private lots has been verified as correct and the as-built rear lot corner elevations have been shown on the as-built plans. 11/19 Page 7 2.The as-built contours for “overlot grading” are shown on the as-built construction plans for all common open spaces, tracts, outlots, etc. If not in compliance, please attach a narrative describing the situation for noncompliance and when it may be corrected. An escrow for overlot grading may be required. (NOTE: Residential Lot Grading Certification is a separate process from this Overall Site Certification. It is understood that residential lots will be brought to final grade once the foundation is backfilled so they may be lower than the plan shows at this Overall Site Certification stage.) 3.All turf reinforcement mats (TRMs) have been installed as shown on the approved construction plans and the slopes are stabilized. XI.Permanent Erosion Control BMPs - FCSCM Ch. 9, Sec. 7.0 A. Construction: All permanent erosion control BMPs have been installed per the approved construction plans. 1.All riprap has been installed in the locations and sizes indicated on the approved construction plans. 2.All fabric has been installed in the locations and sizes indicated on the approved construction plans. a.All fabric was installed per the details on the approved construction plans. XII.Post-Construction Site Cleanup - FCSCM Ch. 3, Sec. 2.0 A. Construction: All construction debris and obstructions of any kind have been removed from drainage paths. 1.All construction debris has been removed except in staging area(s). 2.All ruts have been smoothed out in all construction areas. 3.All areas needing reseeding have been identified and future stabilization goals have been coordinated with the Erosion Control Inspector and in accordance with FCSCM Vol.2 Chapter 12. Note the area needing stabilization in the narrative. XIII.Certification of LID and Water Quality Facilities - FCSCM Ch. 7 A.Attached are the During Construction Inspection Checklist for Low Impact Development (LID) and other items to be verified during construction, along with pictures and other required documentation. B.Attached is verification of the rain garden and/or sand filter flat surface area(s) and ponding volume(s). This verification includes survey of critical elevations. C.Attached is verification of the underground infiltration required volume(s), weir elevations, orifices, inspection ports and filtering fabric. This verification includes survey of critical elevations. D.All visible LID design features were verified as part of the engineer's site visit. 11/19 Still in construction at the time of certification 11/19 Page 8 XIV.Certification of Other Permanent BMPs A.The construction of other permanent BMPs not specifically addressed in this certification is in accordance with the approved plan. This may include grade control structures, rundowns, bridges, stream access/improvements, etc. Please specify other permanent BMPs included on this site: XV. Certification and Erosion Control Measures - FCSCM Ch. 3 A. All temporary erosion control measures shall be removed upon stabilization. If at the time of preparing this certification there are any erosion control measures still remaining on the site, please note them in the narrative and verify that they need to remain at this time. If in doubt as to the need for any control measure, please consult with the Erosion Control Inspector at erosion@fcgov.com. XVI.Statement of Compliance - FCSCM Ch. 3 A. This certification is signed and stamped. By signing this form, the engineer(s) attests that he/she has visited and observed the site, and to the best of his/her knowledge, the as-built conditions of the drainage facilities are as described in the above form and in the enclosed as-built plans. B.Failure to properly disclose all known information could result in the rejection of this certification and prevent the release of any and all Stormwater Utility permit holds on Building Permits and/or Certificates of Occupancy within this development. XVII. Signature and Stamp by a Colorado-Registered Professional Engineer Engineer’s contact information: Name: Email: Phone: Company: Address: PE Stamp 2020/12/23 2/14/17 Page 1 CERTIFICATION OF LOT GRADING Pursuant to Fort Collins City Code § 26-544 & City Land Use Code § 3.3.2 (e) Date: Address: Lot: Block: Subdivision: Permit Application #: Larimer County Parcel #: Larimer County Reception #: (on development agreement) I, (print) , a Colorado registered professional engineer, verify that construction of all stormwater facilities and grading is complete and hereby submit this certification. Please answer the following questions by initialing the appropriate response. For each question initialed “No,” attach an explanation detailing how this will affect stormwater drainage for this lot and any adjacent lots. 1.Certification includes attached Stormwater-approved grading plan. (NOTE: City’s Building Department does not approve grading plans). 2.Certification includes the attached as-built survey dated (must be within 60 days of the date the certification is submitted) accurately and truthfully depicting elevations for: Top of foundation/finished floor Finished grade on each side of the structure Quarter points along each lot line (not more than 50 feet apart) Break points/high points Swales Berms Retaining walls Air conditioning pads Window wells Any other appurtenance(s) within an easement 3.All elevations are within a 0.2 foot tolerance of the approved grading plan. 4.The top of foundation is at least 6 inches above the highest grade surrounding the structure. 5.There is a minimum grade of 5% away from the structure within the first 5 to 10 feet adjacent to the residence. 6.All slopes meet or exceed the minimum requirement of 2% (1% is acceptable on single family lots when the swale is draining the runoff from only two adjoining properties) and are not steeper than 33% (3:1). 7.All flow lines of stormwater drainage swales are a minimum of 6 inches below the elevation of ground adjacent to the structure and will direct drainage as shown on the Stormwater-approved grading plan. 8.All downspout locations and discharge directions are shown on the as-built survey. Runoff is directed into an appropriate drainage system or lot line swale, and it is not directed onto neighboring properties. No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes x x N/A PROJECT IS COMERCIAL N/A PROJECT IS COMERCIAL SOME SWALES WERE DESIGNED AT 1% DUE TO CONSTRAINTS X X X X 2/14/17 Page 2 9.A smooth transition with no vertical offset (step) in grade is provided at the lot line to all adjacent properties. 10.The grading of this lot does not adversely affect neighboring properties or City infrastructure. 11.Landscaping has been completed prior to survey. If not, please indicate who will be responsible for completing landscaping: 12.Final site cleanup has been completed. 13.I personally visited the site as part of the certification process, and in my professional opinion, the as-built survey is an accurate representation of the site conditions.. No Yes No Yes No Yes No Yes No Yes 14.Based on this information, I certify that (check one): □The elevations and drainage patterns of the lot/site are in substantial conformance with the City approved drainage and grading plan for the property (information attached). □The elevations and drainage patterns of the lot/site as measured are in general conformance with the City approved drainage plan with exceptions (information attached). In my professional judgment the elevations and grading of the lot/site as constructed are functionally adequate and equivalent to the specifically approved drainage plan, and will affect stormwater drainage on and off the lot/site in a manner consistent with the approved drainage plan. Name: Email: Phone: Company: Address: NOTE: A complete certification must be submitted at least two weeks prior to a request for a Certificate of Occupancy for the lot/site, including, but not limited to, drawings of the lot/site showing the approved design and as-built surveyed elevations of all structures, drainage and grading features, written information/explanation of discrepancies, and other information necessary to confirm the above certification to: Email (preferred) WaterUtilitiesEng@fcgov.com Mailing Address Fort Collins Utilities ATTN: Water Utilities Engineering 281 North College Avenue Fort Collins, CO 80521 Questions? 970-221-6700 PE Stamp Sign and date X X X LANDSCAPING STILL IN PROGRESS BUT MOSTLY COMPLETE FINAL SITE CLEANUP TO OCCUR X X See attach markups and calcs. 2020/12/23 SO U T H M A S O N S T R E E T GREGER DRIVE K IN G SUR V E Y O R S 65 0 E . G a r d e n D r i v e | W i n d s o r , C o l o r a d o 8 0 5 5 0 ph o n e : ( 9 7 0 ) 6 8 6 - 5 0 1 1 | f a x : ( 9 7 0 ) 6 8 6 - 5 8 2 1 1 SITE AS-BUILT SURVEYOf MASON PLACE APARTMENTS SO U T H M A S O N S T R E E T GREGER DRIVE K IN G SUR V E Y O R S 65 0 E . G a r d e n D r i v e | W i n d s o r , C o l o r a d o 8 0 5 5 0 ph o n e : ( 9 7 0 ) 6 8 6 - 5 0 1 1 | f a x : ( 9 7 0 ) 6 8 6 - 5 8 2 1 1 SITE AS-BUILT SURVEYOf MASON PLACE APARTMENTS EXIST PIPE FLATTER THAN DESIGN, WILL CONVEY 10-YR PIPES FLATTER THAN DESIGN, WILL CONVEY 10-YR 100-YR WILL BACK UP AND POND, AND OVERFLOW TO THE SOUTH OF THE PARKING LOT. THERE IS LESS PROPOSED TOTAL FLOW TO THIS INLET THAN HISTORICAL (PROPOSED 7.0 CFS VS HISTORICAL 10.8 CFS) INLET WILL SURCHAGE IN 100-YR AND OVERFLOW TO THE SOUTH. CONTRACTOR TO PUT HOLES IN FENCE TO PASS OVERFLOW, TO BE CONVEYED TO INLET IN PARKING LOT. THIS IS ACCETPABLE TO THE OWNER. ~1.25' OF COVER AT THIS LOCATION ~2.37' OF COVER AT THIS LOCATION ~0.77' OF COVER ON THIS PIPE AT INLET ~1.46' OF COVER AT INLET TO BE UPSIZED BY CONTRACTOR TO 15" FOR 100-YR CAPACITY 37.01 36.90 37.55 38.99 37.91 38.43 38.83 38.34 38.92 38.97 38.87 38.95 39.00 38.94 38.50 38.59 39.17 39.12 39.14 39.11 39.10 39.16 39.07 39.16 39.17 39.22 39.34 39.24 39.22 38.39 38.24 38.66 38.36 38.30 38.79 39.12 39.32 38.73 39.43 39.17 39.48 39.68 39.49 39.49 39.49 40.00 39.47 39.38 39.04 40.73 40.87 39.76 39.18 39.26 39.45 39.36 40.08 40.39 40.29 40.61 40.33 39.17 39.35 39.00 39.22 39.29 39.24 40.21 40.29 40.59 41.41 41.36 41.26 41.3141.06 39.85 40.95 40.02 41.50 41.52 41.26 41.36 41.55 41.50 41.45 41.47 41.12 41.35 41.05 40.04 39.94 41.44 41.32 41.33 41.46 41.39 41.39 40.83 40.85 41.19 41.73 41.48 41.25 41.05 40.52 40.41 40.88 40.92 41.01 40.91 40.67 41.04 40.94 41.05 40.99 40.96 40.72 40.86 40.62 40.66 40.58 39.96 40.55 39.82 39.74 39.98 40.04 40.12 40.1140.11 40.01 39.56 39.69 40.28 40.53 40.13 40.22 40.5540.45 40.29 40.36 40.28 40.20 40.38 40.14 40.26 40.23 40.24 FI R E LA N E KE E P CL E A R FIRE LANE KEEP CLEAR DRAWING NUMBER: 419 Canyon Ave. Suite 200 Fort Collins, CO 80521 phone 970.224.5828 | fax 970.225.6657 | www.ripleydesigninc.com ■ land planning ■ landscape architecture ■ ■ urban design ■ entitlement ■ ISSUED PROJECT No.: DRAWN BY: REVIEWED BY: SEAL: PREPARED BY: No.DESCRIPTION DATE REVISIONS No.DESCRIPTION DATE Pl o t t e d B y : Er i c J . K o h n e n La y o u t : ST M 2 4 x 3 6 Pr i n t e d O n : 4/ 8 / 2 0 2 0 3 : 0 5 P M Fi l e N a m e : 28 7 3 c - 0 1 - S T M - 0 1 . d w g ORIGINAL SIZE 24X36 RIPLEY DESIGN INC. 419 Canyon Ave. Suite 200 Fort Collins, CO 80521 p. 970.224.5828 f. 970.225.6657 HOUSING CATALYST 1715 W Mountain Avenue Fort Collins, CO 80521 p. 970.416.2910 CIVIL ENGINEER ARCHITECT APPLICANT JVA, INCORPORATED 213 Linden Street, Suite 200 Fort Collins, CO 80524 p. 970.225.9099 SHOPWORKS ARCHITECTURE 2882 Wyandot Street Denver, CO 80211 p. 303.433.4094 OWNER/DEVELOPER MASON PLACE PSH MAJOR AMENDMENT FORT COLLINS, CO JVA, Incorporated 2 1 3 L i n d e n S t r e e t Suite 200 Fort Collins, CO 80524 Phone: 970.225.9099 Fax: 970.225.6963 E-mail: info@jvajva.com JVA Project #2873c CONSULTING ENGINEERS 2843c EJK ETN/CRH 1 MAJOR AMENDMENT 04.25.2018 2 MAJOR AMENDMENT 2 05.16.2018 3 P&Z REVISIONS 05.31.2018 4 FDP 1 02.20.2019 5 FDP 2 04.03.2019 7 MYLAR 05.20.2019 C1.1 STORM DRAIN PLAN CHECKED BY: CHECKED BY: CHECKED BY: CHECKED BY: CHECKED BY: Date Date Date Date Date Date City of Fort Collins, Colorado UTILITY PLAN APPROVAL Parks and Recreation Traffic Engineer Stormwater Utility Water & Wastewater Utility City Engineer CHECKED BY: APPROVED: Date Environmental Planner 1 MYLAR REVISION 04.08.2020 04/08/20 D o c u S i g n E n v e l o p e I D : C F F A 8 2 F E - 9 D 1 1 - 4 6 A 6 - A 4 1 2 - 2 6 6 5 6 6 8 A 7 D 0 6 R e v i s e d C - 3 2 5 0 7 DocuSign Envelope ID: 74B286FF-C441-45CC-ACF3-FAC405D33B31 C-3 2507Revised DocuSign Envelope ID: 65674F4B-8452-49F7-B5D1-820FAECF93F9 EXIST RCP 0.28% 5038.90 5035.00 (EXIST 15" RCP) 5034.21 (EXIST 18" RCP) 5035.13 5035.09 (EXIST 15" RCP) 109 0.97% 5038.69 5036.19 5036.19 21 0.33% 5039.88 5036.30 5036.28 5036.27 26 0.23% 0.70% 0.70% 5036.50 5036.54 5040.59 5036.46 5036.46 5036.46 1.60% 5040.08 5036.36 5036.36 5036.36 5039.56 5037.26 0.68% PIPE TO BE UPSIZED TO 15" FOR CAPACITY AND CORRECTED BY CONTRACTOR 5039.87 5038.72 5036.44 5036.40 5039.78 5039.74 5037.07 5037.09 5040.96 5040.83 5038.79 5036.21 1.44%16 VERIFIED VERIFIED VERIFIED VERIFIED VERIFIED VERIFIED VERIFIED VERIFIED VERIFIED VERIFIED VERIFIED VERIFIED VERIFIED VERIFIED 5037.14 5037.14 5039..30 JVA Incorporated JVA Office: 213 Linden St, Suite 200 Fort Collins Fort Collins, CO 80524 Ph: (970) 225 9099 Version 2016_XT: 9/2/2016 Project Information: Job Name: Mason Place_ASBUILTS Job Number: 2873c Date: 12/23/2020 Designed by: EJK Municipality : Fort_Collins Soil Type: C/D Runoff Calculations: Minor Design Storm: 2 year Major Design Storm: 100 year Detention Calculations: Minor Storm Detention: 5 year plus 100 % WQCV Major Storm Detention: 100 year plus 100 % WQCV Detention Volume by: ≤5ac FAA >5ac FAA+20% Enter WQCV : 0 cf (GB, PP, PLD, SFB, EDB,etc.) Allowable Release Rates (if applicable): Max release rate 1 cfs / acre? Yes Site Area: 0.00 acres Enter Offsite flows to bypass site (these will be added to the allowable release rates) Q5 = 0.00 cfs (bypass flows)Q5allow = 0.00 cfs Q100 = 0.00 cfs (bypass flows)Q100allow = 0.00 cfs Rainfall Data Information: Enter City, Town, or County: Fort_Collins Frequency of Design Event Do you need to Calc P1? No 2 yr 0.82 in 5 yr 1.14 in 10 yr 1.40 in 100 yr 2.86 in Runoff Coefficient Calculations: Use UDFCD Equations? No Intensity Duration Values: I-D-F FortCollinsIDF One Hour Point Rainfall P1 2873c - Rational Calculations_Asbuilts INTRO Page 1 of 5 JVA Incorporated Job Name: Mason Place_ASBUILTS I% C2 C5 C10 C100 213 Linden St, Suite 200 Job Number: 2873c Streets Paved 100% 0.95 0.00 0.95 1.00 Fort Collins, CO 80524 Date: 12/23/20 Concrete Drives/Walks 90% 0.95 0.00 0.95 1.00 Ph: (970) 225 9099 By: EJK Roof 90% 0.95 0.00 0.95 1.00 Gravel 40% 0.50 0.00 0.50 0.63 Landscaping (B soil) 0% 0.15 0.00 0.15 0.19 Mason Place_ASBUILTS Landscaping (C/D soil) 0% 0.25 0.00 0.25 0.31 Historic Runoff Coefficient & Time of Concentration Calculations Playground 10% 0.11 0.00 0.11 0.14 Location: Fort_Collins Artificial Turf 25% 0.20 0.00 0.20 0.25 Minor Design Storm: 2 Major Design Storm: 100 Soil Type: C/D Basin Design Data I (%) = 100% 90% 90% 40% 10% 25% 0% 0%I (%)tc Comp tc Final Basin Name Design Point Apaved streets (sf) Adrives/co nc (sf) Aroof (sf) Agravel (sf) Aplygnd (sf) Aart. turf (sf) Alscape (B soil) (sf) Alscape (C/D soil) (sf) ATotal (sf) ATotal (ac) Imp (%)C2 C5 C10 C100 Upper most Length (ft) Slope (%) ti (min) Length (ft) Slope (%)Type of Land Surface K Velocity (fps) tt (min) Time of Conc ti + tt = tc Total Length (ft) tc=(L/180)+ 10 (min.) Min tc A 1 13,497 2,299 8,810 2,832 27,438 0.63 85.6% 0.88 0.00 0.88 0.93 5 2.0%3.6 150 1.3%Paved areas & shallow paved swales 20 2.3 1.1 4.7 155 10.9 5.0 B 2 32,095 3,665 9,911 6,746 52,417 1.20 84.5% 0.86 0.00 0.86 0.91 5 2.0%3.6 250 1.8%Paved areas & shallow paved swales 20 2.7 1.6 5.1 255 11.4 5.1 OS1 3 655 156 811 0.02 72.7% 0.82 0.00 0.82 0.87 5 2.0%3.6 5 1.5%Paved areas & shallow paved swales 20 2.4 0.0 3.6 10 10.1 5.0 0 0.00 Paved areas & shallow paved swales 20 0 10.0 0 0.00 Paved areas & shallow paved swales 20 0 10.0 TOTAL SITE 45,592 6,619 18,721 0 0 0 0 9,734 80,666 1.85 84.8% 0.87 0.00 0.87 0.92 Basin Name Design Point Time of Conc (tc) C2 C5 C10 C100 2 5 10 100 ATotal (sf)ATotal (ac) Q2 Q5 Q10 Q100 A 1 5.0 0.88 0.00 0.88 0.93 2.85 0.00 4.87 9.95 27,438 0.63 1.58 0.00 2.69 5.82 B 2 5.1 0.86 0.00 0.86 0.91 2.83 0.00 4.84 9.89 52,417 1.20 2.93 0.00 5.01 10.84 OS1 3 5.0 0.82 0.00 0.82 0.87 2.85 0.00 4.87 9.95 811 0.02 0.04 0.00 0.07 0.16 0 0 0 0.00 0 0 0 0.00 TOTAL SITE 80,666 1.85 4.55 0.00 7.77 16.83 Initial Overland Time (ti)Travel Time (tt) tt=Length/(Velocity x 60) tc Urbanized Check ON Runoff Coeff's Rainfall Intensities (in/hr)Area Flow Rates (cfs) Runoff Coeff's 2873c - Rational Calculations_Asbuilts Historic Page 2 of 5 JVA Incorporated Job Name: Mason Place_ASBUILTS 213 Linden St, Suite 200 Job Number: 2873c Fort Collins, CO 80524 Date: 12/23/20 Ph: (970) 225 9099 By: EJK Mason Place_ASBUILTS Developed Storm Runoff Calculations Design Storm : 100 Year Point Hour Rainfall (P1) : 2.86 B a s i n N a m e D e s i g n P o i n t A r e a ( a c ) R u n o f f C o e f f t c ( m i n ) C * A ( a c ) I ( i n / h r ) Q ( c f s ) T o t a l t c ( m i n ) S C* A ( a c ) I ( i n / h r ) Q ( c f s ) I n l e t T y p e Q i n t e r c e p t e d Q c a r r y o v e r Q b y p a s s P i p e S i z e ( i n ) or e q u i v a l e n t P i p e M a t e r i a l S l o p e ( % ) P i p e F l o w (c f s ) M a x P i p e Ca p a c i t y ( c f s ) L e n g t h ( f t ) V e l o c i t y ( f p s ) t t ( m i n ) To t a l T i m e (m i n ) N o t e s A1 1 0.30 1.00 10.90 0.30 7.45 2.24 10.90 0.30 7.45 2.24 12 in PVC 0.5% 2.24 3.52 73 2.8 0.44 11.34 A2 2 0.05 0.31 7.30 0.02 8.67 0.14 7.30 0.02 8.67 0.14 24" Area Drain TOTAL DS of A2 11.34 0.32 7.42 2.35 15 in PVC 0.1% 2.35 3.25 36 1.7 0.36 11.70 A3 3 0.28 0.89 10.80 0.25 7.48 1.86 10.80 0.25 7.48 1.86 Combo 10 in PVC 0.7% 1.9 2.5 26 2.9 0.15 10.95 TOTAL DS of Chamber IN MH 11.70 0.57 7.42 4.20 12 in PVC 3.7% 4.2 9.6 17 7.6 0.04 11.74 TOTAL DS of Chamber OUT MH 11.70 0.57 7.42 4.20 15 in PVC 1.4% 4.2 10.8 17 5.5 0.05 11.75 A4 4 0.06 0.33 10.50 0.02 7.57 0.15 10.50 0.02 7.57 0.15 OSA5 4 0.01 0.34 5.00 0.00 9.95 0.05 5.00 0.00 9.95 0.05 Outside of Site Boundary Total At DP 4 11.70 0.59 7.42 4.38 Tota BASIN A 11.70 0.59 7.42 4.35 B1 6 0.17 1.00 10.90 0.17 7.45 1.28 10.90 0.17 7.45 1.28 8 in PVC 1.0% 1.3 1.7 29 3.0 0.16 11.06 B2 7 0.01 0.47 5.00 0.00 9.95 0.04 5.00 0.00 9.95 0.04 24" Area Drain TOTAL DS of B2 11.06 0.18 7.42 1.30 0.49 8 in PVC 0.2% 1.3 0.8 26 1.4 0.30 11.36 B3 8 0.01 0.74 5.50 0.01 9.63 0.06 5.50 0.01 9.63 0.06 12" Area Drain 6 in PVC 0.7% 0.1 0.7 31 2.1 0.25 5.75 DS of B3 and B2 11.36 0.18 7.42 1.35 0.38 8 in PVC 0.3% 1.4 1.0 21 1.7 0.20 11.56 B4 9 0.14 0.59 7.30 0.08 8.67 0.73 7.30 0.08 8.67 0.73 24" Area Drain DS of B4 11.56 0.27 7.42 1.98 12 in PVC 1.0% 2.0 4.9 109 3.9 0.47 12.03 B5 10 0.11 0.76 10.10 0.08 7.69 0.62 10.10 0.08 7.69 0.62 TOTAL BASIN B 11.56 0.35 7.42 2.57 OSB6 10 0.66 0.91 11.30 0.60 7.42 4.45 11.30 0.60 7.42 4.45 Combo DS of OSB6 11.30 0.95 7.42 7.03 3.36 15 in RCP 0.3% 7.0 3.7 32 1.9 0.29 11.59 OSC1 11 0.02 1.00 5.00 0.02 9.95 0.19 5.00 0.02 9.95 0.19 OSC2 12 0.00 1.00 8.20 0.00 8.31 0.02 8.20 0.00 8.31 0.02 TOTAL SITE BASIN OS 5.00 0.02 9.95 0.21 OSA6 5 0.03 0.46 5.00 0.02 9.95 0.15 5.00 0.02 9.95 0.15 Total Site Flow 7.48 Direct Runoff Total Runoff Inlets Pipe Pipe/Swale Travel Time 2873c - Rational Calculations_Asbuilts Q100 Page 3 of 5 JVA Incorporated Job Name: Mason Place_ASBUILTS 213 Linden St, Suite 200 Job Number: 2873c Fort Collins, CO 80524 Date: 12/23/20 Ph: (970) 225 9099 By: EJK Mason Place_ASBUILTS Developed Storm Runoff Calculations Design Storm : 2 Year Point Hour Rainfall (P1) : 0.82 B a s i n N a m e D e s i g n P o i n t A r e a ( a c ) R u n o f f C o e f f t c ( m i n ) C * A ( a c ) I ( i n / h r ) Q ( c f s ) T o t a l t c ( m i n ) S C* A ( a c ) I ( i n / h r ) Q ( c f s ) I n l e t T y p e Q i n t e r c e p t e d Q c a r r y o v e r Q b y p a s s P i p e S i z e ( i n ) or e q u i v a l e n t P i p e M a t e r i a l S l o p e ( % ) P i p e F l o w (c f s ) M a x P i p e Ca p a c i t y ( c f s ) L e n g t h ( f t ) V e l o c i t y ( f p s ) t t ( m i n ) To t a l T i m e (m i n ) N o t e s A1 1 0.30 0.95 10.90 0.29 2.14 0.61 10.90 0.29 2.14 0.61 12 in PVC 0.5%0.6 3.5 73 2.8 0.44 11.34 A2 2 0.05 0.25 7.30 0.01 2.48 0.03 7.30 0.01 2.48 0.03 24" Area Drain TOTAL DS of A2 11.34 0.30 2.11 0.63 15 in PVC 0.1%0.6 3.3 36 1.7 0.36 11.70 A3 3 0.28 0.84 10.80 0.23 2.15 0.50 10.80 0.23 2.15 0.50 Combo 10 in PVC 0.7%0.5 2.5 26 2.9 0.15 10.95 TOTAL DS of Chamber IN MH 11.70 0.53 2.08 1.11 12 in PVC 3.7%1.1 9.6 17 7.6 0.04 11.74 TOTAL DS of Chamber OUT MH 11.70 0.53 2.08 1.11 15 in PVC 1.4%1.1 10.8 17 5.5 0.05 11.75 A4 4 0.06 0.27 10.50 0.02 2.17 0.04 10.50 0.02 2.17 0.04 Total A BASIN 11.70 0.55 2.08 1.14 OSA5 4 0.01 0.27 5.00 0.00 2.85 0.01 5.00 0.00 2.85 0.01 Outside of Site Boundary Total At DP 4 11.70 0.55 2.08 1.15 B1 6 0.17 0.95 10.90 0.16 2.14 0.35 10.90 0.16 2.14 0.35 8 in PVC 1.0%0.3 1.7 29 3.0 0.16 11.06 B2 7 0.01 0.41 5.00 0.00 2.85 0.01 5.00 0.00 2.85 0.01 24" Area Drain TOTAL DS of B2 11.06 0.17 2.13 0.35 8 in PVC 0.2%0.4 0.8 26 1.4 0.30 11.36 B3 8 0.01 0.68 5.50 0.01 2.76 0.02 5.50 0.01 2.76 0.02 12" Area Drain 6 in PVC 0.7%0.0 0.7 31 2.1 0.25 5.75 DS of B3 and B2 11.36 0.17 2.11 0.36 8 in PVC 0.3%0.4 1.0 21 1.7 0.20 11.56 B4 9 0.14 0.53 7.30 0.08 2.48 0.19 7.30 0.08 2.48 0.19 24" Area Drain DS of B4 11.56 0.25 2.09 0.52 12 in PVC 1.0%0.5 4.9 114 3.9 0.49 12.05 B5 10 0.11 0.70 10.10 0.07 2.20 0.16 10.10 0.07 2.20 0.16 Total B BASIN 11.56 0.32 2.09 0.68 OSB6 10 0.66 0.86 11.30 0.57 2.11 1.19 11.30 0.57 2.11 1.19 Combo DS of OSB6 11.30 0.89 2.11 1.87 15 in RCP 0.3%1.9 3.7 28 1.9 0.25 11.55 OSC1 11 0.02 0.95 5.00 0.02 2.85 0.05 5.00 0.02 2.85 0.05 OSC2 12 0.00 0.95 8.20 0.00 2.38 0.01 8.20 0.00 2.38 0.01 TOTAL SITE BASIN OS 5.00 0.02 2.85 0.05 OSA6 5 0.03 0.40 5.00 0.01 2.85 0.04 5.00 0.01 2.85 0.04 CHAMBER FLOW WQCV (use 1/2 the Intensity calculated for the 2 year event) Area to Chambers (A1-A3)20 0.63 0.84 10.80 0.53 1.07 0.57 10.80 0.53 1.07 0.57 Total Site Flow 1.91 Direct Runoff Total Runoff Inlets Pipe Pipe/Swale Travel Time 2873c - Rational Calculations_Asbuilts Q Minor Page 4 of 5 JVA Incorporated Job Name: Mason Place_ASBUILTS 213 Linden St, Suite 200 Job Number: 2873c Fort Collins, CO 80524 Date: 12/23/20 Ph: (970) 225 9099 By: EJK Mason Place_ASBUILTS Developed Storm Runoff Calculations Design Storm : 10 Year Point Hour Rainfall (P1) : 1.40 B a s i n N a m e D e s i g n P o i n t A r e a ( a c ) R u n o f f C o e f f t c ( m i n ) C * A ( a c ) I ( i n / h r ) Q ( c f s ) T o t a l t c ( m i n ) S C* A ( a c ) I ( i n / h r ) Q ( c f s ) I n l e t T y p e Q i n t e r c e p t e d Q c a r r y o v e r Q b y p a s s P i p e S i z e ( i n ) or e q u i v a l e n t P i p e M a t e r i a l S l o p e ( % ) P i p e F l o w (c f s ) M a x P i p e Ca p a c i t y ( c f s ) L e n g t h ( f t ) V e l o c i t y ( f p s ) t t ( m i n ) To t a l T i m e (m i n ) N o t e s A1 1 0.30 0.95 10.90 0.29 3.65 1.04 10.90 0.29 3.65 1.04 12 in PVC 0.5%1.0 3.5 73 2.8 0.44 11.34 A2 2 0.05 0.25 7.30 0.01 4.25 0.05 7.30 0.01 4.25 0.05 24" Area Drain TOTAL DS of A2 11.34 0.30 3.63 1.08 15 in PVC 0.1%1.1 3.3 36 1.7 0.36 11.70 A3 3 0.28 0.84 10.80 0.23 3.66 0.86 10.80 0.23 3.66 0.86 Combo 10 in PVC 0.7%0.9 2.5 26 2.9 0.15 10.95 TOTAL DS of Chamber IN MH 11.70 0.53 3.63 1.93 12 in PVC 3.7%1.9 9.6 17 7.6 0.04 11.74 TOTAL DS of Chamber OUT MH 11.70 0.53 3.63 1.93 15 in PVC 1.4%1.9 10.8 17 5.5 0.05 11.75 A4 4 0.06 0.27 10.50 0.02 3.71 0.06 10.50 0.02 3.71 0.06 Total A BASIN 11.70 0.55 3.63 1.99 OSA5 4 0.01 0.27 5.00 0.00 4.87 0.02 5.00 0.00 4.87 0.02 Outside of Site Boundary Total At DP 4 11.70 0.55 3.63 2.01 B1 6 0.17 0.95 10.90 0.16 3.65 0.59 10.90 0.16 3.65 0.59 8 in PVC 1.0%0.6 1.7 29 3.0 0.16 11.06 B2 7 0.01 0.41 5.00 0.00 4.87 0.02 5.00 0.00 4.87 0.02 24" Area Drain TOTAL DS of B2 11.06 0.17 3.63 0.60 8 in PVC 0.2%0.6 0.8 26 1.4 0.30 11.36 B3 8 0.01 0.68 5.50 0.01 4.72 0.03 5.50 0.01 4.72 0.03 12" Area Drain 6 in PVC 0.7%0.0 0.7 31 2.1 0.25 5.75 DS of B3 and B2 11.36 0.17 3.63 0.63 8 in PVC 0.3%0.6 1.0 21 1.7 0.20 11.56 B4 9 0.14 0.53 7.30 0.08 4.25 0.32 7.30 0.08 4.25 0.32 24" Area Drain DS of B4 11.56 0.25 3.63 0.90 12 in PVC 1.0%0.9 4.9 114 3.9 0.49 12.05 B5 10 0.11 0.70 10.10 0.07 3.77 0.28 10.10 0.07 3.77 0.28 Total B BASIN 11.56 0.32 3.63 1.17 OSB6 10 0.66 0.86 11.30 0.57 3.63 2.06 11.30 0.57 3.63 2.06 Combo DS of OSB6 11.30 0.89 3.63 3.23 15 in RCP 0.3%3.2 3.7 28 1.9 0.25 11.55 OSC1 11 0.02 0.95 5.00 0.02 4.87 0.09 5.00 0.02 4.87 0.09 OSC2 12 0.00 0.95 8.20 0.00 4.07 0.01 8.20 0.00 4.07 0.01 TOTAL SITE BASIN OS 5.00 0.02 4.87 0.09 OSA6 5 0.03 0.40 5.00 0.01 4.87 0.07 5.00 0.01 4.87 0.07 CHAMBER FLOW WQCV (use 1/2 the Intensity calculated for the 2 year event) Area to Chambers (A1-A3)20 0.63 0.84 10.80 0.53 1.83 0.98 10.80 0.53 1.83 0.98 Total Site Flow 3.26 Direct Runoff Total Runoff Inlets Pipe Pipe/Swale Travel Time 2873c - Rational Calculations_Asbuilts Q 10 Page 5 of 5 HI S T O R I C D R A I N A G E M A P FIG 1 RE V I S I O N D E S C R I P T I O N D' W N DE S ' D DA T E NO . DESIGNED BY: DRAWN BY: CHECKED BY: JOB #: DATE: © JVA, INC. HO U S I N G C A T A L Y S T MA S O N P L A C E FO R T C O L L I N S , C O SHEET NO. 2873c APRIL 2018 CRH EJK EJK JVA, Inc.213 Linden Street, Suite 200 www.jvajva.com Fort Collins, CO 80524 970.225.9099 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver EXIST INLET AND PIPE AREA INCLUDED IN BASIN B FOR ASBUILT FLOW COMPARISON FI R E LA N E KE E P CL E A R FIRE LANE KEEP CLEAR PR O P O S E D D R A I N A G E M A P FIG 2 RE V I S I O N D E S C R I P T I O N D' W N DE S ' D DA T E NO . DESIGNED BY: DRAWN BY: CHECKED BY: JOB #: DATE: © JVA, INC. HO U S I N G C A T A L Y S T MA S O N P L A C E FO R T C O L L I N S , C O SHEET NO. 2873c APRIL 2019 CRH EJK EJK JVA, Inc.213 Linden Street, Suite 200 www.jvajva.com Fort Collins, CO 80524 970.225.9099 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver Autodesk Storm and Sanitary AnalysisAutodesk Storm and Sanitary Analysis SOUTH STORM SYSTEM SURCHARGING PIPES IN 100-YR FLOW THIS WILL NOT SURCHARGE, LID SYSTEM VOLUME IS NOT MODELED. PIPE WILL NOT SURCHARGE IF UPSIZED TO 15" NORTH STORM SYSTEM Autodesk Storm and Sanitary AnalysisAutodesk Storm and Sanitary AnalysisAutodesk Storm and Sanitary Analysis Autodesk Storm and Sanitary AnalysisAutodesk Storm and Sanitary AnalysisAutodesk Storm and Sanitary Analysis