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HomeMy WebLinkAboutFORT COLLINS VETERINARY EMERGENCY & REHABILITATION HOSPITAL - PDP - PDP130018 - SUBMITTAL DOCUMENTS - ROUND 2 - DRAINAGE REPORTQ W J ■ "f1 ■ ■ ■ ■ \y RS �. �® ■aafses1111a0 1111a-a4111-111141111-13"-wM o"4111. 0 I■ ' ■ II --- - ■ n r°*���uu����e���uoea®o■®s®ea®a�e I sl I I p I I li I _ I I I I I I I I I i I I I I !I I I I ______________________________J -- — — — — — — — — — — — — — — — — — — — — — — ---- I y I , p � r 0.31 0.56 p 1 p, PORTA;CAN tI is, lie ■" I p 1 CONSTRUCTION", TRAILER 80 2"'Irn�o®rrCllim'� C � � N O W j !O M O Q 0 0� oam6 L•— NOOW l�' oUm`aY C p C 0 ry r�aLL l0 5 0 l0 20� SCALE: 1• = 10' 21 i w 0 LEGEND z O_ EXISTING PIPES PROPOSED STORM PIPE to FLARED END SECTION EXISTING 5- CONTOUR EXISTING ICONTOUR N W BE 4905 PROPOSED 5' CONTOUR PROPOSED V CONTOUR zQ DESIGN FORT 6 z BASIN CRITERIA 0.26 0.9 5 YR RUNOFF COEFFICIENT M C) y B_ y m AREA IN ACRES m 0- `- FLOW DIRECTION f£S}3Fis>YtF3EaS>t3it�s:}:� BA9N BOUNDARY N MO o —SF—SF— 9L1 FENCE a ® VEHICLE TRACKING PAD O y 6 ,.• p O N O O CW a CONCRETE WASHOUT AREA RS Qw�w9 ROCK SOCK „�,00 REC d1 r A P O �y sTRAw wnrnE 6 Q XQT 2PC��PR��', Jp��ALE�I,• Z () W Z c!) J WU z � m (1) � a W CC O CO 06 LLJ U' I- CALL UTILITY NOTIFICATION Z J z O CENTER OF COLORADO J Q Q U 1.800.922.1987 (811) J �_ Ldll f-BUSHES$ DAYS IN ADVANCE O /1 BEFORE YOU DIG, GRADE. OR EXCAVATE FOR THE NARKING OF UNDERGROUND MEMBER UTLITIES. r, L�. V IA V% H0 M CC O City of Fort Collins, Colorado UTILITY PLAN APPROVAL L:L APPROVED: SHEET 1.I1 En,— Date CHECKED BY. wale, k Wa,I... A, UIiIRX Dale CHECKED By Stum.me, UuntX Dme CHECKED BY: F1. k Rec,-o - Dale S OF 7 CHECKED BY: Lank En9mee, Date JOE No. 346-01 CHECKED BY: ------------ \ EAST MULBERRY STREET L. O CATI N w EAST ELIZABETH STREET w l FRS��F z � q _ a \ EAST PITKIN STREET ------------- -- VICINITY MAP APPENDIX A VICINITY MAP A 7. REFERENCES 1. City of Fort Collins, "Storm Drainage Criteria Manual", (SDCM), dated June, 2001 and Ordinance 174 adopted in December 2011. 2. Urban Drainage and Flood Control District, "Urban Storm Drainage Criteria Manual", Volumes 1 and 2, dated March, 1969, and Volume 3 dated September, 1992. 3. Old Town Master Drainage Plan Update by Anderson Consulting currently in progress. 4. Drainage calculations for 800 Lemay Carwash and Tunex dated July 15, 1986 by Stewart & Associates. 13 pumped groundwater will be conveyed and the measures taken to prevent the transport of any pollutants to downstream waters. 7) Inspection & Maintenance: It is required that routine site inspections are performed to effectively address maintenance and repair of Best Management Practices (BMP's). The site inspections are to performed by the contractor or an inspector designated by the administrator at a minimum of once every fourteen (14) calendar days on active construction sites and after any significant storm event (an event causing runoff). As part of the site inspections the inspector is required to keep documentation of all inspections and BMP maintenance, including an updated Site Map indicating new BMP's or the removal of BMP's since the previous inspection. Any maintenance, repair, or necessary installation of BMP's that are noted during the inspection must be completed within seven (7) calendar days from the date of the inspection. 6. CONCLUSIONS 6.1 Compliance with Standards All computations that have been completed within this report are in compliance with the City of Fort Collins Storm Drainage Design Criteria Manual and the drainage calculations for 800 Lemay Carwash and Tunex. 6.2 Drainage Concept The proposed drainage concepts presented in this report and on the construction plans adequately provide for conveyance of runoff to the street or existing storm system. No new storm conveyances are proposed on site. If, at the time of construction, groundwater is encountered, a Colorado Department of Health Construction Dewatering Permit would be required. 12 routes intersect paved public roads. Vehicle tracking control pads shall be installed to minimize the transport of sediment (mud) by runoff or vehicles tracking onto the paved surface. Any mud tracked to public roads shall be removed on a daily basis and after any significant storm that causes sediment to be transported. It is unlawful to track sediment/mud onto public streets and may be enforced by the City of Fort Collins or by the State of Colorado. 5) Waste Management and Disposal: Portable toilets will be anchored & periodically maintained by waste management company. Dumpsters on site will be covered & periodically emptied by waste management company. Concrete waste will be allowed to harden and then will be removed from site. No washing activities will occur on site. Location of the concrete washout is shown on the site map. The washout will be sufficiently deep to accommodate all anticipated concrete truck wash water. Waste concrete will be allowed to harden and be removed from site periodically as the washout reaches 50% of its capacity. 6) Groundwater and Stormwater Dewatering: No groundwater encountered during soils exploration therefore not anticipated to be an issue. If groundwater is encountered a groundwater discharge permit shall be obtained and a detailed report shall be completed describing the location and the route of where trap sediments. 2) Materials Handling and Spill Prevention: Materials Handling &Spill Approximate location on site Applicable to this Prevention BMP Project Portable toilets, anchored & Refer to site map X located away from drainages Fuel storage located in bulk tanks with secondary containment & spill kit Mobile fueling performed at least 200 feet away from drainages & Refer to site map X fully attended Fertilizers, form oil, solvents, cleaners, detergent stored in 55 gal Refer to site map X or smaller containers, kept in storage units Dumpsters containing used chemicals containers & liquid Refer to site map X wastes kept covered Equipment cleaning (on site) uses no detergents & flows to onsite retention basin In case of a release of fuel or other chemicals, absorbent booms or earthen berms will be immediately Location of spill X constructed to contain the spill & prevent runoff to adjacent surface waters MSDS sheets for onsite chemicals will be kept at the construction Construction Trailer X trailer to facilitate spill response & cleanup 3) Dedicated Asphalt or Concrete Batch Plant: Not proposed with this development. 4) Vehicle Tracking Pad: Vehicle tracking control pad shall be installed wherever construction vehicle access E daily (no onsite maintenance) 5.5 BMP Implementation 1) Phased BMP Implementation BMP's are expected to change as the construction progresses and it is the responsibility of the contractor to ensure appropriate BMP's are in place and/or removed at the appropriate time in the construction sequence. All BMP's shall be inspected and repaired or replaced as required to satisfy the conditions of the Stormwater Discharge Permit. All BMP's must be maintained and repaired as needed to assure continued performance of their intended function. The following phase depictions and erosion controls are suggestions to the contractor only and are in no way intended to dictate construction phasing or control of the work on site. The contractor shall be responsible to control construction phasing and provide adequate erosion control associated with each phase in order to comply with the SWM Plan and Permit that is obtained by the contractor (or owner) for the site. Phase I — Mobilization Install silt fence, Install rock sock at existing inlet, set dumpster. Phase 2 — Demolition Remove building & remove building debris from site. Sawcut & remove pavements noted for removal on the demolition plan, remove Sand / oil separator and dispose of properly Phase 3 - Overlot Grading Fill on site to achieve building pad elevation Phase 4 - Utilities Excavate and install for water service, excavate and install dry utilities Phase 5 —Site Paving Install sub base, install concrete washout, install curbs and sidewalks, install Asphalt pavement. Phase 6 — Building construction Install install concrete foundation, remove concrete washout. Complete building construction Phase 7 — Landscape installation Backfill on site curbs and final shape swale and planting areas, Landscape plant installation, Install mulch ground cover & sod Phase 8 — Final Stabilization Final stabilization is complete when constructed improvements are in place, Inspect completed construction for possible sources of erosion and amend the plan as required to 9 Non -Structural Practices for Erosion and Sediment Control: Soils exposed during the earthwork phase and landscape prep phase shall be kept in a roughened condition by ripping or disking along land contours until mulch, vegetation, or other permanent erosion control is installed. No large amount of soils (in excess of 15 yards) will be allowed to be stock piled on site. Overburden from the utility pipe trenching will be piled adjacent to trenches upstream of sediment controls and will be replaced in the trenches within 72 hours. Excess excavated materials from the demolition and grading phases of the project that cannot be reused on site will be exported as it is excavated. This includes any asphalt pavement from the existing site that is to be removed. A vehicle tracking pad will be installed at a location most beneficial to the site construction as determined by the contractor. Vehicles will not be permitted in the excavated area if soil is muddy. Gravel sub base will be placed and compacted in the areas indicated for pavement following excavation. During construction activities the street will be monitored for foreign debris tracked out of the site and mechanical sweeping and clean up will be performed as needed. No area shall remain exposed by land disturbing activity for more than thirty (30) days before required temporary or permanent erosion control (e.g. seed/mulch, landscaping, etc.) is installed. Temporary & Permanent non-structural BMP's: Non -Structural BMP Approximate location on -site - Applicable to this Project Surface roughening Entire site X Soil stockpile height limit (less than 10') Perimeter vegetative buffer West boundary of site X Minimization of site disturbance Entire site X Mulch Seed & mulch stockpiles after 30 days Stockpile toe protection (silt fence, wattles or ditch) Preservation & protection of West boundary of site X existing vegetation & trees Good site housekeeping (routine Entire Site X cleanup of trash & constr debris) Heavy equip staged on site, Staging area X properly maintained & inspected 8 SEDIMENT/EROSION CONTROL BEST MANAGEMENT PRACTICES (BMPs) COST OPINION SPREADSHEET Fort Collins Veterinary Hospital Item No. BMP ID Unit Installation Unit Cost Maintenance as % of Installation Installation & Maintenance Unit Cost Quantity Cost 1 Check Dam CDR LF 25% $0.00 $0.00 2 Check Dam (Reinforced) CDR LF 25% $0.00 $0.00 3 Concrete Washout Area CWA EA $1,200.00 200% $3,600.00 1 $3,600.00 4 lConstruction Fence CF I LF 25% $0.00 $0.00 5 Construction Markers CM LF 50% $0.00 $0.00 6 Culvert Inlet Filter CIF LF 25% $0.00 $0.00 7 Dewatering DW EA 50% $0.00 $0.00 8 Diversion Ditch (Unlined) DD LF 25% $0.00 $0.00 9 Diversion Ditch (ECM or plastic) DD LF 10% $0.00 $0.00 10 Sediment/Erosion Control Matting ECM SY 25% $0.00 $0.00 11 Inlet Protection IP LF 50% $0.00 $0.00 12 Reinforced Rock Berm RRB LF 25% $0.00 $0.00 13 Sediment Basin(') SB LF 25% $0.00 $0.00 14 Sediment Control Log (Wattle) SCL LF $4.60 25% $5.75 15 $86.25 15 Seeding and Mulching SM AC 50% $0.00 $0.00 16 Silt Fence SF LF $3.00 75% $5.25 250 $1,312.50 17 Rock Sock RS LF $10.00 10% $11.00 30 $330.00 18 Stabilized Staging Area SSA SY 50% $0.00 $0.00 19 Surface Roughening SR AC 25% $0.00 $0.00 20 Temporary Stream Crossing TSC EA 25% $0.00 $0.00 21 Topsoil (6-inch Lift) TSL AC 25% $0.00 $0.00 22 Vehicle Tracking Control(2) VTC EA $1,500.00 100% $3,000.00 1 $3,000.00 Contractor Added BMP(s) I') 23 % $0.00 24 % $0.00 25 % $0.00 26 % $0.00 27 % $0.00 2$ 1 1 % $0.00 SUBTOTAL COST $8,328.75 CONTINGENCY 15% $1,249.31 TOTAL COST (4) $9,578.06 5.4 Best Management Practices (BMP's) for Stormwater Pollution Prevention Structural Practices for Erosion and Sediment Control Structural practices for the site will consist mainly of silt fence and rock sock filters and are described in detail in the following paragraphs. These BMP's are expected to remain in place construction progresses. If additional BMP's are required to provide adequate protection, it is the responsibility of the contractor to ensure appropriate BMP's are in place and/or removed at the appropriate time in the construction sequence. All temporary and permanent erosion and sediment control practices must be maintained and repaired as needed to assure continued performance of their intended function. Silt fence and rock sock filters shall be in place prior to commencement of construction activities. During clearing and grubbing necessary for silt fence installation, all cleared material shall be placed on the uphill side so that if erosion occurs from the cleared material, the sediment will be trapped and not transported downstream. Rock socks shall be located around the existing inlet as shown on the Drainage & Erosion Control Plan. All BMP's shall be installed per the details shown on the construction plan set. Temporary & Permanent Structural BMP's: Structural BMP Approximate location on site Applicable Project this Silt Fence Site perimeter, refer to site map X Straw bale dams Wattles At existing inlet X Earthen diversion dams Vegetated swales Sediment trap/pond Pipe slope drains Geogrid Inlet/outlet protection Existing inlet, refer to site map X Culverts Riprap Erosion control mats Inlet protection At inlets, refer to site map X 7 Permit holder: Name: Address: Phone Number: Email Address: Appointed agent: Name: Address: Phone Number: Email Address: 5.3 Identification and location of all potential pollution sources Potential Pollutant Source Activity Potential Pollutant Generated Applicable to this project Disturbed Areas Sediment X Soil stockpiles Sediment X Travel to adjacent public streets Tracked sediment X Contaminated soils Sediment, chemicals Loading and unloading chemicals Chemicals Outdoor storage of chemicals Chemicals On site equipment maintenance Oil, grease On site equipment fueling Diesel, gasoline X Dust generating activities Particulates, sediment X Use of fertilizer, pesticides, herbicides Fertilizer, pesticides Use of detergents, solvents, oils Detergents, solvents, oil X Waste dumpsters, waste piles Chemicals X Concrete washout Concrete, sediment X On site equipment washing Detergents, oil On site asphalt batch plant Asphaltic cement, sediment On site concrete batch plant Cement, sediment Portable toilets Domestic sewage X maintained and all runoff from the site will continue to flow to this detention area. The amount of imperviousness in this basin will also be reduced, therefore the amount of runoff anticipated will also be reduced with this proposed redevelopment. Basin 3 includes a small area along the west boundary of 808 South Lemay that will drain directly to Lemay Avenue as it has historically done. The majority of this basin is landscape area. 4.3 Drainage Summary All runoff from this site and the adjacent sites will be safely conveyed via surface flow to the street or existing storm system. The site will maintain the drainage patterns that currently exist on site. The City of Fort Collins will be responsible for maintenance of the existing storm drainage facilities located within the right-of-way. The drainage facilities located on the site will be maintained by the property owner. 5. STORMWATER MANAGEMENT CONTROLS 5.1 Written Analysis The site is currently developed and a majority of the improvements will be preserved in order to minimize site disturbance and the opportunity to generate sediment. The nature of the construction activities are demolition, installation of new utility services and construction of a new building. As stated previously, the total site area is 0.6 acres. The existing vegetative cover is 17% and the proposed vegetative cover is 26%. The area proposed to be disturbed is 50% of the site. The nearest receiving water is the Cache la Poudre River north of the site. The runoff from the site enters the River via Lemay Avenue at a location approximately 500' north of the site. The purpose of the construction activities is to provide additional facilities for the existing veterinary hospital. Construction Phasing is addressed in Section 5.5. 5.2 SWMP contact information 5 basins. Standard Form 9 (SF-9) provides a summary of the design flows for all Sub - basins and Design Points associated with this site. 3.4 Hydraulic Criteria No hydraulic calculations were completed for this site because the amount of runoff from this site will not increase. It is assumed that the existing storm conveyances currently operate adequately in storm events and this development will not impact the existing operation. 4. DRAINAGE FACILITY DESIGN 4.1 General Concept The runoff from this site will be collected in the flowpath in the asphalt and be conveyed to Lemay Avenue or to the existing detention pond and inlet in the northeast corner of the site. No runoff from this site will impact the adjacent properties. 4.2 Specific Flow Routing A summary of the drainage patterns within each basin is provided in the following paragraphs. Basin 1 encompasses the majority of the lot at 816 South Lemay Avenue and the existing Vet Clinic building. Very minor changes will be made to this lot and will include the removal of some existing parking adjacent to Lemay to meet the parking setbacks. The existing flow path is in the center of the asphalt which conveys runoff west and into Lemay Avenue. A majority of this asphalt and flowpath will remain but runoff from this lot will be routed through a grassed swale prior to entering Lemay in the historic manner. This will provided some opportunity for the runoff from the site to have sediment removal. The amount of asphalt will be reduced, therefore the amount of runoff will be reduced. Basin 2 includes the majority of the lot at 808 South Lemay Avenue which is the existing carwash to be demolished. The building expansion will be located on this lot and the existing parking lot will be reconfigured. Runoff from this basin historically flows to an existing detention pond in the northeast corner of the lot. This detention pond will be 4 2. DRAINAGE BASINS AND SUB -BASINS 2.1 Major Basin Description The proposed development lies within the Old Town Drainage Basin. 2.2 Sub -basin Description This site (800 Lemay) is included in the drainage calculations for "800 Lemay Carwash and Tunex" by Stewart & Associates dated July 15, 1986, included in Appendix C of this report. 3. DRAINAGE DESIGN CRITERIA 3.1 Regulations This report was prepared to meet or exceed the "City of Fort Collins Storm Drainage Design Criteria Manual" specifications. Where applicable, the criteria established in the "Urban Storm Drainage Criteria Manual" (UDFCD), 1984, developed by the Denver Regional Council of Governments, has been used. 3.2 Development Criteria Reference and Constraints The runoff from this site has been routed to maintain the existing drainage patterns on site. The Old Town Basin is normally required to detain to the 2 year historic runoff rate but, because there is no increase in imperviousness proposed on this site, no detention will be provided with this development. 3.3 Hydrologic Criteria Runoff computations were prepared for the 10-year minor and 100-year major storm frequency utilizing the rational method. All hydrologic calculations associated with the basins are included in Appendix B of this report. Standard Form 8 (SF-8) provides time of concentration calculations for all sub- No Text 1. GENERAL LOCATION AND DESCRIPTION 1.1 Location The existing Fort Collins Veterinary Emergency Hospital & Rehabilitation Clinic (Vet Clinic) site is located on Lot 2, 800 Lemay Properties and the proposed expansion is located on Lot 1, Lemay Ltd First Subdivision. This project is located in Section 18, Township 7 North, Range 68 West of the Sixth Principal Meridian, in the City of Fort Collins, Larimer County, Colorado. See the location map in Appendix A. The project is located east of Lemay Avenue between Riverside Avenue and Elizabeth Street. The project is bounded on all sides by existing commercial & retail development. 1.2 Description of Property The entire site (both lots) consists of approximately 0.6 acres of land. The site at 816 Lemay is currently developed with asphalt drives and parking and a building that contains the existing Vet Clinic. The site at 808 Lemay is currently developed with a car wash building, a storage building, asphalt drives and parking. A majority of the existing asphalt will be preserved with some reconfiguration to allow the site to meet minimum parking setbacks. The existing care wash building will be demolished and the storage building and vet clinic building will be preserved. Sidewalks on site will also be reconfigured to accommodate the new parking and new building and to meet the arterial street standards and provide a parkway. The existing site at 816 Lemay currently drains to the parking lot to a flow path in the asphalt which conveys the runoff to Lemay through the drive access. The existing site at 808 Lemay currently drains to the shared private drive on the north boundary of the site and flows east into an existing detention pond which releases into an existing area inlet. None of the site appears to drain onto the adjacent properties. The site will continue to generally drain in the existing flow paths. The runoff from the site at 816 Lemay will be routed through a grassed swale prior to entering Lemay Avenue. The proposed development will reduce the amount of imperviousness and will therefore reduce the amount of anticipated runoff. No additional detention is proposed for this site. TABLE OF CONTENTS TABLE OF CONTENTS............................................................................................................... iii GENERAL LOCATION AND DESCRIPTION 1.1 Location...................................................................................................................1 1.2 Description of Property............................................................................................I 2. DRAINAGE BASINS AND SUB -BASINS 2.1 Major Basin Description..........................................................................................2 2.2 Sub -Basin Description.............................................................................................2 3. DRAINAGE DESIGN CRITERIA 3.1 Regulations..............................................................................................................2 3.2 Development Criteria Reference and Constraints...................................................2 3.3 Hydrologic Criteria..................................................................................................2 3.4 Hydraulic Criteria....................................................................................................3 4. DRAINAGE FACILITY DESIGN 4.1 General Concept......................................................................................................3 4.2 Specific Flow Routing.............................................................................................3 4.3 Drainage Summary ..................................................................................................4 5. STORMWATER MANAGEMENT CONTROLS 5.1 Written Analysis.....................................................................................................4 5.2 SWMP Contact Information...................................................................................4 5.3 Identification and location of all potential pollution sources..................................5 5.4 Best Management Practices (BMP's) for Stormwater Pollution Prevention ........... 6 5.5 BMP Implementation...............................................................................................7 6. CONCLUSIONS 6.1 Compliance with Standards..................................................................................11 6.2 Drainage Concept.................................................................................................. i l 7. REFERENCES..................................................................................................................12 APPENDICES A Vicinity Map B Hydrologic Computations C Excerpts from Previous Reports iii North Star design 700 Automation Drive. Unit 1 Windsor, CO 80550 Phone:970-686-6939 Fax:970-686-1188 June 28, 2013 Glen Schlueter City of Fort Collins Stormwater 700 Wood Street Fort Collins, CO 80522-0580 RE: Final Drainage and Erosion Control Study for Fort Collins Veterinary Emergency Hospital & Rehabilitation Clinic Dear Glen, I am pleased to submit for your review and approval, this Final Drainage and Erosion Control Study for the Fort Collins Veterinary Emergency Hospital & Rehabilitation Clinic located at 816 Lemay Avenue and the proposed expansion onto 808 Lemay Avenue. I certify that this report for the drainage design was prepared in accordance with the criteria in the City of Fort Collins Storm Drainage Manual. 1 appreciate your time and consideration in reviewing this submittal. Please call or email if you have any questions or retntire clnrificntinns. �� ��'fpprO..REd'/ Sincerely, ���`0� ,RO ST- `v Q 31306 Patricia Kroetch, P.E.+j0NA6.?'� "I•..,,,,,) t t ii FINAL DRAINAGE AND EROSION CONTROL STUDY FORT COLLINS VETERINARY EMERGENCY HOSPITAL & REHABILITATION CLINIC Prepared for: Hauser Architects 3780 E 15th St, Ste 201 Loveland, CO 80538 970-669-8220 Prepared by: North Star Design, Inc. 700 Automation Drive, Unit I Windsor, Colorado 80550 (970)686-6939 June 28, 2013 Job Number 346-01