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HomeMy WebLinkAboutDrainage Reports - 10/25/2012' City of Ft. Collins ed Plans Approved By Vt >rr-L FINAL DRAINAGE AND EROSION CONTROL REPORT LEGACY SENIOR RESIDENCES Fort Collins, Colorado Prepared for: Cornerstone Associates, LLC 209 South 191h St, Suite 600 Omaha, NE 68102 ' Prepared by: NORTHERN ENGINEERING 200 South College Avenue, Suite 10 Fort Collins, Colorado 80524 Phone:970.221.4158 Fax:970.221.4159 www.northernengineering.com ' 1A This Drainage Report Is consciously,provided as a,PDF.. Please consider the gnvironment before printing this document in its entirety. When a hard copyds absolutely necessary, we recommend double -sided printing. Project Number: 683-001 NorthernEngineering.com // 970 221 41'SB ' NORTHERN ADDRESS: PHONE: 970.221.4158 wEBSITE: 200 S. College Ave. Suite 10 ENGINEERING Fort Collins, C080524 FAX: 970.221.4159 www.northernenginearing.com October 15, 2012 City of Fort Collins Stormwater Utility 700 Wood Street Fort Collins, Colorado 80521 ' RE: Final Drainage and Erosion Control Report for LEGACY SENIOR RESIDENCES Dear Staff: Northern Engineering is pleased to submit this Final Drainage and Erosion Control Report for your review. This report accompanies the Final Compliance Plans submittal for the proposed Legacy Senior Residences development. ' This report has been prepared in accordance to Fort Collins Stormwater Criteria Manual (FCSCM), and serves to document the stormwater impacts associated with the proposed project. We understand that review by the City is to assure general compliance with standardized criteria contained in the FCSCM. ' If you should have any questions as you review this report, please feel free to contact us. Since EERING SERVICES, INC. W t Ad n Cvar, PE �� Kevin R. Brazleton, PE ct Engineer: Project Engineer 1 1 1 1 1 1 ■� INORTHERN ' ENGINEERING ' TABLE OF CONTENTS ' I. GENERAL LOCATION AND DESCRIPTION.................................................................... 1 A. Location.............................................................................................................................................1 B. Description of Property..................................................................................................................... 1 C. Flood lain............................................................................ II. DRAINAGE BASINS AND SUB-BASINS........................................................................ ' A. Major Basin Description....................................................................................................................4 III. DRAINAGE DESIGN CRITERIA.................................................................................... A. Regulations........................................................................................................................................5 5 B. Four Step Process.............................................................................................................................. 5 ' C. Development Criteria Reference and Constraints............................................................................ 6 D. Hydrological Criteria......................................................................................................................... 6 ' E. Hydraulic Criteria.............................................................................................................................. 6 F. Floodplain Regulations Compliance.................................................................................................. 6 ' G. Modifications of Criteria................................................................................................................... 7 IV. DRAINAGE FACILITY DESIGN..................................................................................... 7 A. General Concept............................................................................................................................... 7 B. Specific Details..................................................................................................................................8 V. CONCLUSIONS..........................................................................................................9 A. Compliance with Standards.............................................................................................................. 9 B. Drainage Concept............................................................................................................................10 ' References......................................................................................................................... 11 APPENDICES: APPENDIX A — Hydrologic Computations ' APPENDIX B — Hydraulic Computations B.1 — Storm Sewers B.2 — Inlets APPENDIX C — Water Quality Design Computations APPENDIX D — Offsite Basins Exhibit APPENDIX E — Erosion Control Report (Storm Water Management Plan) APPENDIX F — FEMA FIRMette IFinal Drainage Report 1 1 1 1 1 1 1 1 1 1 1 ■� INORTHERN ENGINEERING nces LIST OF TABLES AND FIGURES: Figure1 — Aerial Photograph.................................................................................................. 2 Figure 2— Proposed Site Plan.................................................................................................. 3 Figure 3 — Existing Floodplains...............................................................................................4 Table 1 — Water Quality Pond Summary .................................................................................. 9 MAP POCKET: Drainage Exhibit Final Drainage Report I 1 F� ■� INORTHERN ENGINEERING I. GENERAL LOCATION AND DESCRIPTION A. Location 1. Vicinity Map i Senior Residences 2. The project site is located in the northwest quarter of Section 12, Township 7 North, Range 69 West of the 6" Principal Meridian, City of Fort Collins, County of Larimer, State of Colorado. 3. The project site is located on the west side of Linden Street, the north side of Poudre Street. The Cache La Poudre River runs just to the north of the project site. 4. The project site lies within the Downtown River District study area (Ayres, 2012), and is located within Basin 114. This basin has a master planned outfall directly to the Cache La Poudre river, which runs just north of the project site. Due to the project site proximity to the river,. no detention is required for onsite runoff. 5. Downtown development exists to the south and east of the site. The Aztlan Community Center exists to the west of the project site. B. Description of Property 1. The subject property is approximately 1.97 net acres. Final Drainage Report 1 I NORTHERN 1 CN6I N;ENiNG Legacy Senior Residences 1 1 L 1 1 1 1 Figure 1 — Aerial Photograph 2. The subject property currently consists of open area. The ground cover generally consists of gravel and some native seeding. Existing ground slopes are rather gentle throughout (i.e., 2±%). General topography slopes from southwest to the northeast towards the Cache La Poudre River. 1 3. According to the United States Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS) Soil Survey, the site consists of Paoli fine sandy loam, which falls into Hydrologic Soil Group B. More site -specific exploration found varying materials including sandy clay with occasional sand layers and sandy gravel. See the Geotechnical Engineering Report by Terracon Consultants, Inc. for additional information. ' 4. The proposed project will develop the majority of the existing site, constructing a senior housing center. Parking areas and associated utilities will be constructed. A water quality pond will be constructed at the northeast corner of the site. 1 1 1 1 Final Drainage Report NORTHERN ENQINEENINU Legacy Senior Residences ry Vr.y. NORTH \ i' Figure 2— Proposed Site Plan 5. There are no irrigation ditches or related facilities in the vicinity of the project site. 6. The proposed land use is senior housing. ' C. Floodplain 1. The subject property is not located in either a FEMA regulatory or City of Fort Collins ' designated floodplain. The proposed outfall for the water quality pond is located outside of the property boundary and lies within the Cache La Poudre 100-year floodplain and floodway. 2. FEMA places the subject property within the unshaded Zone X Flood Hazard Area, which constitutes an area determined to be outside the 0.2% annual chance floodplain. LJ Final Drainage Report 3 I I [I I I 1 !J I� I 11 NORTHERN ENGINEEM KO Figure 3 — Existing Floodplains 3. The Cache La Poudre 100-year and 500-year floodplain exist to the northeast of the project site. FEMA FIRM Panel Number 979 for Larimer County, Dated June 17, 2008 (Revised May 2, 2012) are referenced in this study. A copy of the FIRMette is provided in the appendix of this report. 4. The base (100-year) flood elevation in the vicinity of the proposed structure is 4954.8, which is referenced to the City of Fort Collins NGVD 29. The proposed structure's finished floor elevation will be set at elevation 4865.25 (FtCollins NGVD29). The overtopping elevation of the Linden Street bridge is 4859.14 (FtCollins NGVD29). 5. The proposed structure is located outside of the 100-year and 500-year floodplain. 6. The Cache La Poudre half -foot floodway is located outside of the property boundary. No fill is proposed within the half -foot floodway for construction of the offsite pond outfall pipe. 7. It is noted that the vertical datum utilized for site survey work is the City of Fort Collins Benchmark #4-00 (Elevation=4960.55, Ft. Collins NGVD 29). 8. A floodplain use permit and no -rise certification will be required for the offsite pond outfall pipe within the floodplain. II. DRAINAGE BASINS AND SUB -BASINS A. Major Basin Description 1. The project site is located within the Downtown River District study area (Ayres, 2012), and is located within Basin 114Sub-Basin Description 2. The subject property historically drains overland towards the Cache La Poudre River, Final Drainage Report 7 NORTHERN ' ENGINEERING Legacy Senior Residences which runs northeast of the site. A more detailed description of the project drainage patterns follows in Section IV.A.4., below. 3. Developed areas to the southwest of the site historically drain through the project site. 1 These off -site drainage flows and patterns will be maintained and accounted for with the proposed development. III. DRAINAGE DESIGN CRITERIA A. Regulations There are no optional provisions outside of the FCSCM proposed with the proposed project. ' B. Four Step Process The overall stormwater management strategy employed with the proposed project utilizes the "Four Step Process" to minimize adverse impacts of urbanization on receiving waters. 1 The following is.a description of how the proposed development has incorporated each step. Step 1 — Employ Runoff Reduction Practices ' Several techniques have been utilized with the proposed development to facilitate the reduction of runoff peaks, volumes, and pollutant loads as the site is developed from the current use as athletic facilities by implementing multiple Low Impact Development (LID) 1 strategies including: Nsl Conserving existing amenities in the site including the existing vegetated areas and large trees around the perimeter of the site. Providing large vegetated open areas throughout the site to reduce the overall impervious area and to minimize directly connected impervious areas (MDCIA). Nip Routing flows, to the extent feasible, through vegetated swales to increase time of concentration, promote infiltration and provide initial water quality. Step 2 — Implement BMPs That Provide a Water Quality Capture Volume (WQCV) with Slow Release 1 The efforts taken in Step 1 will facilitate the reduction of runoff; however, urban development of this intensity will still generate stormwater runoff that will require additional BMPs and water quality. All stormwater runoff from the site will ultimately be routed to the northeast corner of the site, where it is intercepted and treated in the main water quality pond prior to exiting the site. ' Step 3 — Stabilize Drainageways There are no major drainageways in the subject property. While this step may not seem applicable to proposed development, the project indirectly helps achieve stabilized drainageways nonetheless. By providing water quality where none previously existed, sediment with erosion potential is removed from the downstream drainageway systems. Furthermore, this project will pay one-time stormwater development fees, as well as ongoing monthly stormwater utility fees, both of which help achieve City-wide drainageway stability. 1 Final Drainage Report ■� INORTNERN ' ENGINEERING Legacy Senior Residences Step 4 — Implement Site Specific and Other Source Control BMPs. The proposed project includes a senior housing center which will require the need for site specific source controls including: 1 N9 Several localized trash enclosures throughout the site for the disposal of household waste. C. Development Criteria Reference and Constraints The subject property is essentially an "in -fill" development project as the property is surrounded by currently developed properties. As such, constraints have been identified during the course of this analysis that will impact the proposed drainage system including: NQ Existing elevations along the perimeter of the site will be maintained. N! As previously mentioned, overall drainage patterns of the existing site will be maintained. D. Hydrological Criteria 1. The City of Fort Collins Rainfall Intensity -Duration -Frequency Curves, as depicted in Figure RA-16 of the FCSCM, serve as the source for all hydrologic computations associated with the proposed development. Tabulated data contained in Table RA-7 ' has been utilized for Rational Method runoff calculations. 2. The Rational Method has been employed to compute stormwater runoff utilizing ' coefficients contained in Tables RC-11 and RO-12 of the FCSCM. 3. Three separate design storms have been utilized to address distinct drainage scenarios. A fourth design storm has also been computed for comparison purposes. The first design storm considered is the 80th percentile rain event, which has been ' employed to design the project's water quality features. The second event analyzed is the "Minor," or "Initial" Storm, which has a 2-year recurrence interval. The third event considered is the "Major Storm," which has a 100-year recurrence interval. The fourth storm computed, for comparison purposes only, is the 10-year event. 4. No other assumptions or calculation methods have been used with this development that are not referenced by current City of Fort Collins criteria. E. Hydraulic Criteria 1. As previously noted, the subject property maintains historic drainage patterns. 2. All drainage facilities proposed with the project are designed in accordance with criteria outlined in the FCSCM and/or the Urban Drainage and Flood Control District ' (UDFCD) Urban Storm Drainage Criteria Manual. 3. As stated above the subject property is not located in either a FEMA regulatory or a City of Fort Collins designated floodplain. ' 4. The proposed project does not propose to modify any natural drainageways. F. Floodplain Regulations Compliance 1. As previously mentioned, this project is not subject to any floodplain regulations. However, extra care has been taken to ensure that neither existing nor proposed ' structures will suffer damage during the 100-year storm as a result of the proposed development. The outfall pipe for the proposed water quality pond will involve a riprap rundown which will convey flows into the Cache La Poudre River. This Final Drainage Report 6 11 1 [i ■� INORTHERN ENGINEERING i Senior Residences rundown is being designed by Flywater Consulting. Permitting and construction supervision will be coordinated by Flywater Consulting. G. Modifications of Criteria 1. The proposed development is not requesting any modifications to criteria at this time. IV. DRAINAGE FACILITY DESIGN A. General Concept 1. The main objectives of the project drainage design are to maintain existing drainage patterns, ensure no adverse impacts to any adjacent properties, and to maintain the drainage concepts as outlined in the Downtown River District study (Ayres, 2012). 2. Developed areas to the southwest of the site historically drain through the project site. These off -site drainage flows and patterns will be maintained and accounted for with the proposed development. 3. A list of tables and figures used within this report can be found in the Table of Contents at the front of the document. The tables and figures are located within the sections to which the content best applies. 4. The drainage patterns anticipated for proposed drainage basins are described below. Basin 1 Basin 1 consists of landscaped area to the rear of the proposed building and a portion of the rooftop. The basin drains west and north into a proposed swale running along the west side of the proposed building. The proposed swale drains to an existing ' swale located to the north of the building. The existing swale drains north to the Cache La Poudre River. Basin 2A and 2B Basins 2A and 2B consist of the rooftop of the proposed building. The basins drain into a roof drain system to the front and rear of the building. The roof drain system drains into the water quality pond at the northeast corner of the site. Basin 3 Basin 3 consists mainly of the proposed parking area and the proposed water quality pond. The basin drains via surface flow into the proposed water quality pond at the northeast corner of the site. The area in the southeast corner of this basin will only be graded and seeded with the current development. In the future, it is anticipated that this area may be developed. All runoff and water quality calculations assume a 95% imperviousness for this area to ensure future use of the area will not be encumbered. Basin 4 Basin 4 consists mainly of the proposed parking area. The basin drains into a storm drain system which drains into the proposed water quality pond at the northeast corner of the site. Final Drainage Report 7 ■� INORTHERN ENGINEERING Legacy Senior Residences Basin 5 Basin 5 consists of a concrete drive and landscaped area to the south of the building. The basin drains via surface flow into Poudre Street. A sidewalk chase will capture the flows from this small basin and direct flows into the proposed swale running along the west side of the proposed building. The proposed swale drains to an existing swale located to the north of the proposed building. The existing swale drains north to the Cache La Poudre River. Basin 6 Basin 6 consists of landscaped area. The basin drains via surface sheet flow into the Cache La Poudre River. Basin 7 Basin 7 consists of landscaped area, and parking lot drive. The basin drains via surface sheet flow into Linden Street. Basin OSl Basin OS1 consists of developed areas to the south of the project site. Runoff from this basin will follow existing drainage patterns, as stormwater from this basin will be directed via the proposed swale into the existing swale to the north of the proposed building. This existing swale is the historic concentration point for flows from this offsite basin. Basin OS2 Basin OS2 consists of developed areas to the south of the project site. Runoff from this basin will be directed via surface flow into the proposed water quality pond at the northeast corner of the site. Offsite runoff will then be captured in the outlet pipe for the proposed water quality pond, and be directed into the Cache La Poudre River. A full-size copy of the Drainage Exhibit can be found in the Map Pocket at the end of this report. B. Specific Details 1. Water quality treatment is being provided for the proposed development in the form of extended detention as previously described. Final design details, construction documentation, and Standard Operating 1 Procedures (SOP) Manual shall be provided to the City of Fort Collins for review prior to Final Development Plan approval. A final copy of the approved ' SOP manual shall be provided to City and must be maintained on -site by the entity responsible for the facility maintenance. Annual reports must also be prepared and submitted to the City discussing the results of the maintenance program (i.e. inspection dates, inspection frequency, volume loss due to sedimentation, corrective actions taken, etc.). 1 Final Drainage Report g a i i J ■� (NORTHERN ENGINEERING r Residences 2. Table 1, below, summarizes the water quality information for the proposed water quality pond. 1 Table 1 — Water Quality Pond Summary Pond Water Quality Water Quality Spillway Top of Pond Capture Volume WSEL Elevation Elevation (AC -FT) (FT) (FT) (FT) ' 0.047 4958.55 4959.80 4959.80 3. Proper maintenance of the drainage facilities designed with the proposed development is a critical component of their ongoing performance and effectiveness. The water quality pond may be easily accessed by maintenance staff via the gentle slope provided to the bottom of the pond from the south side. 4. The drainage features associated with the proposed project are all private facilities, located on private property with the exception of the water quality pond outfall pipe. The outfall pipe is located within Aztlan Community Center property. A drainage easement will be dedicated for said outfall pipe to ensure that the stormwater conveyance outfall line is protected. 5. The proposed outfall pipe requires a riprap rundown to the Cache La Poudre River, which has been designed in conjunction with river bank stabilization done by others. There are no other facilities or upgrades needed off -site in order to accommodate the developed runoff from the proposed development. Placement of the outfall and riprap will require a no -rise certification for the Cache La Poudre floodway. Pre- and post - construction survey will be required in order to ensure no fill is placed within the Cache La Poudre floodway. The tolerance for surveying is 0.00-feet. A floodplain use permit will be required for construction of this outfall. V. CONCLUSIONS ' A. Compliance with Standards 1. The drainage design proposed with the proposed project complies with the City of Fort ' Collins' Stormwater Criteria Manual. 2. The drainage design proposed with this project complies with the Downtown River District Final Design Report (Ayres, 2012). 3. There are no regulatory floodplains within the proposed development. The outfall pipe for the proposed water quality pond will involve a riprap rundown which will convey flows into the Cache La Poudre River. This rundown is being designed by Flywater 1 Consulting. Permitting and construction supervision will be coordinated by Flywater Consulting. The rundown is in the Cache La Poudre River floodplain and floodway. 4. The drainage plan and stormwater management measures proposed with the proposed development are compliant with all applicable State and Federal regulations governing stormwater discharge. 5. The proposed development is in compliance with Chapter 10 of City Code. Final Drainage Report 9 ■V INORTHERN ENGINEERING Legacy Senior Residences B. Drainage Concept 1. The drainage design proposed with this project will effectively limit any potential damage associated with .its stormwater runoff by providing an extended detention water quality pond. 2. The drainage concept for the proposed development is consistent with the Downtown River District Final Design Report (Ayres, 2012). Final Drainage Report 10 ■(NORTHERN ENGINEERING Legacy Senior Residences References 1. City of Fort Collins Landscape Design Guidelines for Stormwater and Detention Facilities, November 5, 2009, BHA Design, Inc. with City of Fort Collins Utility Services. 2. Fort Collins Stormwater Criteria Manual, City of Fort Collins, Colorado, as adopted by Ordinance No. 174, 2011, and referenced in Section 26-500 (c) of the City of Font. Collins Municipal Code. 3. Larimer County Urban Area Street Standards, Adopted January 2, 2001, Repealed and Reenacted, Effective October 1, 2002, Repealed and Reenacted, Effective April 1, 2007. ' 4. Soils Resource Report for Larimer County Area, Colorado, Natural Resources Conservation Service, United States Department of Agriculture. ' 5. Urban Storm Drainage Criteria Manual, Volumes 1-3, Urban Drainage and Flood Control District, Wright -McLaughlin Engineers, Denver, Colorado, Revised April 2008. ' 6. Downtown River District Final Desien Report, February 2012, Ayres Associates. 7. Geotechnical Eneineeriniz Report, Keifer Concrete Storage Yard, February 1, 2011, Terracon Consultants, Inc. I ,J LI JI ' Final Drainage Report 11 APPENDIX A HYDROLOGIC COMPUTATIONS 1 1 1 1 � 2 a o, e o 0 0 0 0 0 0 0 0 0 0 E If100 MO LL'1 O m M ma) V E � o C1 M m m n m u7 in oo .. m N N 7 w 4 O o °c " LnOOu70�n �Doompoo m .oq O o OIL Lglp m ao Z o a c � E oo_000 00 0 0 oo U >. o .a UEV �IDQ o « C 4 d CO O `V V C GO/ O O N tl') 4'7 lD oo Oo L lD O d .� 6c�oo6000000 U7 m m 1� DD lD N 1� oo 0 -ItLo 00 I� v m o 0 Q u It C1 f V U U Z W a d C o O r N LO LD 00 00 to 0 O d > T O. 7 m 0 m F� 00 lD N I� 00 V In n V N E K o 0 0 O O O O O O 00 O o U U Q o c_ 0 O N O. V O o 0 V tf7 tI7 N CO 1� p C v o o0 o 0 o o 0a3o0000000 N m 0 0 0 11,5m N 2 ED 7 �o o v oy o0000000 0 om m 0 e'Z u y p� O a) a N OO E u y O v o0000000 .qq qq q00 o O on O n O O Opt ac7 00000000 o oo o 2 t � ap Q — M O m aOOo o o cmlON Z C mmu7ma .-.N m O u N�000000 lD N00 d yO O O O O p 0 .0. 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II II O O H y •ao Mto ^ M 0 0 m o z 1 1 1 1 1 1 1 1 1 i 1 1 1 1 1 1 3 S w r- Ln ', m v m O N 1O Ln r� 00 LL C U .-+ '-i M T Ln 0 0 0 O Ln 3 n n n V LO m o Cl)o r, N N NO .2 C7 u 0 0 •-L N o g q -4 o N Lo N O o `� 3 N N v t 00 o v .-. o o Cl) O r-i c LL 0'�i O O O '-i .-a O O O N O '+ M T 000 LD Q —� T y m 'Q .-. C Cm .--' Ln V Ln Lo Ln Ln V N N .--' a o. c$ m rn rn o m 0) rn rn O r� to o w _ of of rn � a) 0) m ai r, r� Lo Lo c m V � Lo r, rl a r, r� r, r, v r, oo Lo c Ln ao Lb m o0 oo ao oo m Ln o o0 N C r, Lf7 Ln In Ln Ln Ln In LC) m 00 W , N t C LC! 00 00 D) 00 00 00 Lb D) O 00 LO O v C N, N N— N N N N .-L N W m xi o Ln O O Ln O Ln 01 O O rl O) w Lo O O rn o oo m ao o Ln Lo eo ppp�� p 0 - 0 0 00 ': 00 0 u NN � v i L� rp a N n Ln cD) n LD 00 00 b LD n tD 00 O V In .-+ o v m V O O O O O O O O O O O O 2 m p® A U w N m Ln LD 00 00 Ln W o L) Ln rn rn . LD N rl ao Ln rl� u o 0 0 0 0 000 O co 0 � a v W ✓ D D Os. D y LD LI) Ln .m-L Ln Ln lI) In O Ln 00 U c T C O H '� Lo Lo Ln ti Ln to L17 Ln CT 'N-L � O) U 00 O NE Lo Ln Ln n n n n cli ID rn 0 p - Lli N m Lo Ln o 0 o LD Cj . S Q v O O O O O o 0 0 r i 0— m rn N r 0 0 o + p U y cc l �_ m o .�i 'N N m � Ln LD r,O Ni-n CO Ln Ln CL N O .2 c N ,C = mti Y m m m lY m m � o ` U ON N Cl) • E m m oa OO i APPENDIX B HYDRAULIC COMPUTATIONS B.1 — Storm Sewers B.2 — Inlets APPENDIX B.1 STORM SEWERS J N O N O a-- O O ' J O Z E LO O O N a uj O J U D O O d Storm Sewer Summary Report Page 1 Line No. Line ID Flow rate (cfs) Line size (in) Line length (ft) Invert EL Dn (ft) Invert EL Up (ft) Line slope N HGL down (ft) HGL up (ft) Minor loss (ft) HGL Junct (ft) Dns line No. 1 Pipe - (30) (1) 15.90 24 c 89.8 4953.12 4953.57 0.501 4954.53 4955.14 0.56 4955.70 End Project File: Storm A 2005.stm Number of lines: 1 Run Date: 07-10-2012 NOTES: c = cir; e = ellip; b = box; Return period = 100 Yrs. Hydraflow Storm Sewers 2005 a � I 11 I I I I I I I � 12 � � � E 0 � � � � i C cc � §co £ , . ) .. ■ ° W2 ) m §._ Co§ w° . ) u Jm\LO CM. C) 6 C; § \ $ . ƒ 0 LU j - �)£ 2 0 § k \CD = 2 CL § $ a) « £ w k z . D LO �k£ LO ■ £;— >�E b £ ■ . \ £ 2 ■ \ ) .. Cl) �k£ � �}£ � E k k ( a kcli 0 � k# k - > F Cl)£ �,— $ § _ O / CD C) 7 � , � / a . ¥ . E . j — . ƒ k E k , I 0 0 N 3 NC O rl �I Storm Sewer Summary Report Page 7 1 1 1 1 Line Line ID Flow Line Line Invert Invert Line HGL HGL Minor HGL Dns No. rate size length EL Dn EL Up slope down up loss Junct line (cfs) (in) (ft) (ft) (ft) N (ft) (ft) (ft) (ft) No. 1 Pipe - (19) 15.40 18 c 30.6 4956.58 4956.66 0.262 4958.00* 4958.57* 0.59 4959.16 End 2 Pipe - (22) 6.20 18 c 28.3 4956.91 4957.19 0.988 4960.15* 4960.24* 0.14 4960.38 1 3 Pipe - (23) (1) 6.20 18 c 118.1 4957.18 4958.66 1.253 _ 4960.38* 4960.73* 0.28 4961.01 2 4 Pipe - (24) 3.00 10 c 18.9 4958.91 4959.20 1.533 4961.01 * 4961.31 * 0.35 4961.66 3 5 Pipe - (25) 3.00 10 c 40.3 4959.20 4959.84 1.588 4961.66* 4962.31* 0.47 4962.78 4 6 Pipe - (26) 1.50 8 c 62.8 4959.84 4960.63 1.257 4962.96* 4963.79* 0.20 4963.99 5 7 Pipe - (27) 1.00 8 c 60.1 4960.63 4961.38 1.249 4964.15* 4964.50* 0.10 4964.60 6 8 Pipe - (28) 0.50 6 c 33.3 4961.38 4961.80 1.261 4964.62* 4964.85* 0.10 4964.95 7 9 Pipe - (29) 0.50 6 c 7.5 4961.80 4961.89 1.201 4964.95* 4965.00* 0.10 4965.10 8 Project File: Storm B 2005.stm Number of lines: 9 Run Date: 07-10-2012 NOTES: c = cir; e = ellip; b = box; Return period = 100 Yrs. ; *Surcharged (HGL above crown). Hydraflow Storm Sewers 2005 1-0 Gl 11 co tp r- 0 O O O - O O O O O O O O O J d Y o v co in O (n 0 O p (n n a n 0 n n o 0 V O O O .- O o N N_ � co M M V' oo w w N C 2 F O c OND co N O O Y O W— O O O O O O O O O - r d L O o m rn m cn `n co n n N N u7 In M 0 w w O O O O 0 M n n O m V' w C 7 �r (A e co w O N 0) N m (n m (n CO coono (n (0 w .- O O .-- — O O 0 to c`7 N w w w M (n O J> n m f� n O w m W 0 tn m co m c00 m w m (No m CD 0 cvo m coo m co m v v v v v v v v v v m —y y O (n O (n O Cl) (o 00 Lo (n (n (n Vj y c6 d w M M (n 6 4 N N N C _ CL ` n n n (n (n (n (o 0 0 O Q ` n n (n an Cl) M N N L E L 7 Z _ d o U? U? (n. 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N3 d Zvi 5' U) °� oC �6 1N a�T �o J 1N c O N O N Q �, m N Wa' 6+ =O N o 0 M u L °� a P o 3 u� m ui ni W 4,% O O F- sty. N L Q Q ui I-- T iu p �_ a IL a tt� o m m LL d N Oy4��� ry OLL u? �- (C3 IQ cmU CO) p r O �— - a �p 1 i^ U i L u 6 E x du3 00to U E — O p g U auv pp —N � S . m N t m U lD E ul _7 C,U� E E `O m � p U) Ui APPENDIX B.2 INLETS INLET IN A SUMP OR SAG LOCATION Project = 683-001 Inlet ID = Combo Inlet Lo (C) i H-Curb H-Vert Wo W Lo (G) Warning an Information llnoutt of Inlet I Depression (additional to continuous gutter depression'a' from'Q-AOow) bar of Unit Inlets (Grate or Curb Opening) it Depth at Flowine (outside of local depression) a Information th of a Unit Grate h of a Unit Grate Opening Ratio for a Grate (typical values 0.15.0.90) ging Factor for a Single Grate (typical value 0.50 - 0.70) Weir Coefficient (typical value 2.15 - 3.60) Orifice Coefficient (typical value 0.60 - 0.80) Opening Information th of a Unit Curb Opening it of Vertical Curb Opening in Inches it of Curb Orifice Throat in Inches i of Threat (see USDCM Figure ST-5) Width for Depression Pan (typically the gutter width of 2 feet) ling Factor for a Single Curb Opening (typical value 0.10) Opening Weir Coefficient (typical value 2.3-3.6) Opening Orifice Coefficient (typical value 0.60 - 0.70) al Inlet Interception Capacity (assumes clogged condition) NING: Inlet Capacity less than Q Peak for Minor and Major Storms warning 1: Dimension entered a not a typical dimension for inlet type specified. Warning 3: Clo'ggmg factor is not in the recommended value for inlet type specified, MINOR MAJOR Inlet Type = Denver No. 16 Combination a_,v 2.00 2.00 inches No= 1 Flow Depth= 4.0 12.0 inches MINOR MAJOR L. (G) = 3.00 S.CO feet We= 2.00 2G0 feet A- = 0.31 0, C, (G) = 0.50 0.50 C„, (G) = 3.60 C.(G)= 0.60 060 MINOR MAJOR Lo (c) Hw H-= Theta = Wo= Cr (C) _ C. (C) _ C. (C) _ = 3.00 3.Oi - 6.50 8.50 5.25 5 2 0.0o 0,00 2.00 2.0 0.10 0.10 3.70 3 70 0.66 66 MINOR MAJOR Da = 1.4 9.2 QPF KRE-ED= 2.0 16.0 feet Inches inches degrees feet UD Inlet 3.1-comboinlet, Inlet In Sump 7/9/2012, 2:55 PM MINOR MAJOR Da = 1.4 9.2 QPF KRE-ED= 2.0 16.0 feet Inches inches degrees feet UD Inlet 3.1-comboinlet, Inlet In Sump 7/9/2012, 2:55 PM 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Area Inlet Performance Curve: Governing Equations: At low flow depths, the inlet will act like a weir governed by the following equation: ' where P = 3.1416•Dia.of grate Q = 3 .0 P H ' S ' where H corresponds to the depth of water above the flowline At higher flow depths, the inlet will act like an orifice governed by the following equation: _ 0 `� A g u \ )0.5 where A equals the open area of the inlet grate V A l l J ' where H corresponds to the depth of water above the centroid of the cross -sectional area (A) The exact depth at which the inlet ceases to act like a weir, and begins to act like an orifice is unknown. However, what is known, is that the stage -discharge curves of the weir equation and the orifice equation will cross at a certain flow depth. The two curves can be found below: If H > 1.792 (A/P), then the grate operates like an orifice; otherwise it operates like a weir. Input Parameters: Type of Grate: PERFORATED MANHOLE COVER Diameter of Grate (ft): 1.5 Open Area of Grate (ft): 1.32 Flowline Elevation (ft): 4962.18 Reduction Factor: 50% Depth vs. Flow: Shallow Orifice Actual Elevation Weir Flow Flow Flow Depth Above Inlet (ft) (ft) (cfs) (cfs) (cfs) 0.00 4962.18 0.00 0.00 0.00 0.10 4962.28 0.22 1.12 0.22 0.20 4962.38 0.63 1.59 0.63 0.30 4962.48 1.16 1.94 1.16 0.40 4962.58 1.79 2.24 1.79 0.50 4962.68 2.50 2.51 2.50 0.60 4962.78 3.29 2.75 2.75 0.70 4962.88 4.14 2.97 2.97 0.80 4962.98 5.06 3.17 3.17 APPENDIX C WATER QUALITY DESIGN COMPUTATIONS 1 1 1 1 1 1 1 1 i 1 1 WATER QUALITY POND DESIGN CALCULATIONS Water Quality Pond Project: 683-001 By: ATC Date: 8.15.12 REQUIRED STORAGE & OUTLET WORKS: BASIN AREA = 1.640 <-- INPUT from impervious calcs BASIN IMPERVIOUSNESS PERCENT = 83.00 <-- INPUT from impervious calcs BASIN IMPERVIOUSNESS RATIO = 0.8300 <-- CALCULATED WQCV (watershed inches) = 0.348 <-- Determined from Figure 3-2, VOL 3, CH 3.0 WQCV (ac-ft) = 0.057 <-- CALCULATED from Equation EDB-1, VOL 3, CH 4, T-5 WQ Depth (ft) = 2.400 <-- INPUT from stage -storage table AREA REQUIRED PER ROW, a (in2) = 0.178 <-- CALCULATED from Equation EDB-3, VOL 3, CH 4, T-5 CIRCULAR PERFORATION SIZING: dia (in) = 0.500 <-- INPUT from Figure 5 n = 7.000 <-- INPUT from Figure 5 t (in) = 0.500 <-- INPUT from Figure 5 number of rows = 1.000 <-- CALCULATED from WQ Depth and row spacing J V O^ Z J o< V o O � Oo N O N (O (D M �t Lf� O c+M 00 '�t M� I N N (fl M O � _ v N 00 CA M O a)N O I-- N ti Lo M 0) N M Lo LO N O N O M U J ^ _ Q Z% O U V U Q z d t f) U') M a)M M O O L6 M (O ti 06 0 O ao N d O O CO 00 ao 06 N DO In M to ao W* M to M d) N O NM 0 f� O O O v I� w O (O M " ZLLJ _I m Q J Z O w J 1= rr nn O > 00 O � (M4 N N N 00 N L� M M N Lf ) N (D M f� O N O O O M M M O O c~- ti M r- N M O d 0 r- d LO ti M M M M � O M M (p 0N m M (O w Q O V Q O � J U) w z ^ O W> ;CIO Q N CN CV LO(O (V (!j CO O M O cM O O M M N M (.0CY) O N O O M LO Lf) M 1\ O I� M O N �- w M 1— r- LN() O IT T- 0 w ti O COO N ti - 0 to CO w M QZ " _ U) ^ Q = Q Z O O N O O O N O O O N O O O N O O O N O O O N O O O N O O O N O O O N O O O N O O O N O O O N O O O N O O O N O O O N O O O N O O O N O O O N O Q^ W c4 O M _~ ti (O M (fl Ln ~C) 0OO O M , 00 N � O O 0) 1` 00 t (0 O N N 00 Lo O ( N O O 1-, O Lr) N O r- O r- I- CV N 00 (M O N M O 4 O M 0 M � OM M O N cr) Lo M O Lo() MM 00Q M WO J W O N O Lo O O O L) m O O O Lo O O O 00 Ln 0 O O O Lo 0 O O N 1- Lo rn O O Iq I-- Ln rn O O 0w r-.: Lo rn O O 1` Lo rn O O O 6 Ln rn O O N 6 LO rn O O 'It 06 LO rn O O (0w 6 LO 0) O O 06 LO w O O O O u') 0) O O N O Ln rn O O d' O LO rn O O O 6 to rn O O w 6 LO rn r 0 1 1 1 1 0 O C O c `o 0) o o a) E w c m 0 d 0 0 m a) v w v E a) N cc N C a) O E E 0 a L m m N U p p U a) a) -p C a) X Oa a) O L N L ca � y O E — oa)� a) �= p 0 w _� as 3 m ur L CD o 0 CD N m 0 U C m > O 42 a) m N� . c m 0 ca O a)N 0 L 3 o a) a) U O C w C (Q V O X a) a) o 'EC 'p °� ° aO) 'V 0 v ` `E aOi .0 3 O N �L= N N 2 a) o= U x m a) M O O .NO. y m Q Q U (� 0) 3 J U m o c m u a) `m O > o(a L U m a) n � O 0 U u 0 0 t c U= c U Q 2 0 N O U)•CM MO a7 E O i6 C C j 6 y •O W N N 0 CL N o S F- o a) m v= a) O S O OOON(")h OONO(O ,a y 000co Cl) ao V a) d U) � p LL 0 U LL �oc000 IX @ v 0o N LO U) 11 0 U.) 0 c o I` 0 0 0 IL C) ao m a) O U li U 00ou-)Unao E� n 0 ma 0 X tL `m o f0 0 m No0 o o a E U m m 0 Q U cm ,a c 0 0 0 p 0 0 4) m V N U V U a) as w ^ QO O.a) LL 0 W 0 0 0 m 0 0 2 0 C)counLOC)LO N N N M 0 CO Cl) N m 3 LL o LL LL U 0000(Or- O O CD N — a) �a O O O O O M co U m o Co U LL m toO LO � N CO N N N O OD (O (O a) M 0 N O— Ita0 M O) V 0 f0 > 3 c m 0 0 o LL Uti1LU O O O O O O O O 1- O co m — � C 000000 O � V) II II II 11 a Y Q Cc'), N I— LL u� m> c o 'C,) 00=m O O N O LO O f� In O) U) N > t LL j m o a) c a) m co� 00000� a-LLin j�Y L) m 2.�•� o Op.ai oF- > > W W m 0mLLLL Lo Lo O) to LL-) a0 C a0 LO 00 LO 0 O) lC) LL) O) 0 U 2 0 v v v 0 �— � U) APPENDIX D OFFSITE BASINS EXHIBIT No Text APPENDIX E EROSION CONTROL REPORT (STORM WATER MANAGEMENT PLAN) t 1 1 1 1 1 1 1 i E 1 1 1 i 1 1 1 Stormwater Management Plan for LEGACY SENIOR RESIDENCES Fort Collins, Colorado October 5, 2012 Prepared for: Cornerstone Associates, LLC 209 South 19" St, Suite 600 Omaha, NE 68102 Prepared by: NORTHERN ENGINEERING 200 South College Avenue, Suite 10 Fort Collins, Colorado 80524 Phone: 970.221.4158 Fax: 970.221.4159 www.northernengineering.com Project Number: 683-001 NORTHERN ENGINEERING October 5, 2012 Cornerstone Associates, LLC 209 South 19th St, Suite 600 Omaha, NE 68102 RE: Stormwater Management Plan Legacy Senior Residences ITo whom it may concern: ADDRESS: PHONE:970.221.4158 WEBSITE: 200 S. College Ave. Suite 10 Fort Collins, CO 80524 FAX: 970.221.4159 www.northernengineering.com Northern Engineering Services, Inc. is pleased to submit this Stormwater Management Plan for Legacy Senior Residences. This report outlines Best Management Practices (BMPs) to be implemented with the proposed construction in order to minimize potential pollutants in stormwater discharges. We have prepared this report to accompany the Colorado Department of Public Health and Environment General Permit for Stormwater Discharge Associated with Construction Activities (aka, Stormwater Discharge Permit or SDP). The General Permit No. for this SDP is COR-0300000. A copy of the issuance cover letter can be found in the Appendix D of this document. Please note: this Stormwater Management plan (including the Site Maps) is not a static document. It is a dynamic device that should be kept current and logged as construction takes place. As such, this version was prepared to facilitate initial plan approvals and permitting, but does not necessarily reflect the final version, or the transitions throughout the construction process. As the site develops and changes, the Contractor is expected and encouraged to make changes to what is contained herein so that the SWMP works as effectively and efficiently as possible. It shall be the responsibility of the SWMP Administrator and/or the permit holder (or applicant thereof) to ensure the plan is properly maintained and followed. If you should have any questions or comments as you review this report, please feel free to contact us at your convenience. Sincerely, NORTHERN ENGINEERING SERVICES, INC. IAaron Cvar, PE 1 NORTHERN ENGINEERING Legacy Senior Residences TABLE OF CONTENTS Vicinity Map 1.0 General Requirements...............................................................................................1 1.1 Objectives...........................................................................................I...................... 1 1.2 SMWP Availability...................................................................................................... 1 1.3 Definitions......................................................................................................:...........1 1.4 Additional Permitting................................................................................................... 1 2.0 2.1 Narrative Site Description.......................................................................................... 2 Existing Site Description.............................................................................................. 2 2.2 Nature of Construction Activity..................................................................................... 2 2.3 Sequence of Major Activities..................................................................................I...... 2 2.4 Site Disturbance 2.5 2.6 Existing Data.............................................................................................................. Existing Vegetation...................................................................................................... 3 3 2.7 Potential Pollution Sources........................................................................................... 3 t 2.8 2.9 Non-stormwater discharges.......................................................................................... Receiving Waters........................................................................................................ 4 4 3.0 Stormwater Management Controls..............................................................................5 1 3.1 SWMP Administrator................................................................................................... 5 3.2 Best Management Practices (BMP's) for Stormwater Pollution Prevention .......................... 5 ' 3.3 3.4 Structural Practices for Erosion and Sediment Control ..................................................... Non -Structural Practices for Erosion and Sediment Control .............................................. 5 9 3.5 Phased BMP Installation............................................................................................ 11 3.6 Material Handling and Spill Prevention........................................................................ 11 3.7 Dedicated Concrete or Asphalt Batch Plant.................................................................. 12 3.8 3.9 Vehicle Tracking Control............................................................................................ Waste Management and Disposal............................................................................... 12 12 3.10 Groundwater and Stormwater Dewatering.................................................................... 13 4.0 Final Stabilization and Long -Term Stormwater Management........................................14 4.1 Final Stabilization..................................................................................................... 14 4.2 Long -Term Stormwater Management........................................................................... 14 5.0 Inspection, Maintenance and Record Keeping............................................................15 5.1 BMP Inspection........................................................................................................ 15 5.2 5.3 BMP Maintenance.................................................................................................... Record Keeping .................................................... 15 6.0 Additional SWMP and BMP Resources......................................................................17 IReferences...................................................................................................................18 Stormwater Management Plan I I 1 I 1 1 1 1 NORTHERN ENGINEERING Legacy Senior Residences LIST OF TABLES: Table 1 — Native Grass Seed Mix............................................................................................ 9 Table 2 — Preliminary Permit and Construction Schedule for The Grove at Fort Collins ................11 APPENDICES: APPENDIX A — Site Maps APPENDIX B — Erosion Control Details APPENDIX C — Landscape Plan APPENDIX D — Copies of Permits/Applications APPENDIX E — Stormwater Management Plan Inspection Log APPENDIX F — Contractor Inserts (as needed) APPENDIX G — Contractor Inserts (as needed) Stormwater Management Plan it (NORTHERN ENGINEERING Legacy Senior Residences 1.0 General Requirements 1.1 Obiectives The objective of a Stormwater Management Plan (SWMP) is to identify all potential sources of pollution likely to occur as a result of construction activity associated with the site construction, and to describe the practices that will be used to reduce the pollutants in stormwater discharges from the site. The SWMP must be completed and implemented at the time the project breaks ground, and revised as necessary as construction proceeds to accurately reflect the conditions and practices at the site. This report summarizes the Stormwater Management Plan for the construction activity that will occur with proposed project as well. This plan has been prepared according to regulations of the Colorado Department of Public Health and Environment (CDPHE), Water Quality Control Division. 1.2 SMWP Availability This report is intended to remain on the aforementioned construction site to allow for maintenance 1 and inspection updates, and for review during inspection. 1.3 Definitions BMP — Best Management Practice encompassing a wide range of erosion and sediment control practices, both structural and non-structural in nature, which are intended to reduce or eliminate any possible water quality impacts from stormwater leaving a construction site. Erosion Control BMPs — Practices that PREVENT the erosion of soil, such as minimizing the amount of disturbed area through phasing, temporary stabilization, and preserving existing vegetation Sediment Control BMP's — Practices to REMOVE sediment from runoff, such as sediment basins, silt fence, or inlet protection. Non-structural BMP's — The implementation of methods, practices, and procedures to minimize water quality impacts, such as the preservation of natural vegetation, preventive maintenance and spill response procedures. Structural BMP's — Physical devices that prevent or minimize water quality impacts, such as sediment basins, inlet protection, or silt fence. 1.4 Additional Permitting As mentioned above, this Stormwater Management Plan is associated with the Colorado Department of Public Health and Environment Stormwater Permit that is issued by the Water Quality Control Division of the CDPHE. Additional Environmental permitting not described in this report will likely be required as a part of this project. An example is the Construction Dewatering Permit for groundwater, which will be discussed later. Another example is the Air Pollution Emission Notice (APEN). The CDPHE website contains links to both of these permits, as well as many other potential permits. The Contractor is responsible for ensuring the proper permits are acquired. 1 IStormwater Management Plan L NORTHERN ENGINEERING Legacy Senior Residences 2.0 Narrative Site Description 2.1 Existing Site Description The project site is located in the northwest quarter of Section 12, Township 7 North, Range 69 West of the 6th Principal Meridian, City of Fort Collins, County of Larimer. The project site is located on the west side of Linden Street, the north side of Poudre Street. The Cache La Poudre River runs just to the north of the project site. The subject property is approximately 1.97 net acres. 2.2 Nature of Construction Activity The proposed project will develop the majority of the existing site, constructing a senior housing center. Parking areas and associated utilities will be constructed. A water quality pond will be constructed at the northeast corner of the site. 2.3 Sequence of Malor Activities To complete the project, many basic construction activities will take place. The project will begin by stripping the site of topsoil, followed by overlot grading. The installation of utilities will occur next, including water, sewer, storm sewer, and an underdrain system. Once overlot grading is complete, and utilities have been installed, it is anticipated that construction of the building foundations will begin. While building foundations are being constructed, curb and gutter will be installed, followed by asphalt paving of the drives and parking areas. Vertical construction of the buildings is expected to commence once the public infrastructure has been inspected by the city. The final stages of construction will be fine grading of the areas around the buildings, and the installation of landscaping throughout the project. n 1 1 iStormwater Management Plan 2 NORTHERN ENGINEERING Legacy Senior Residences 1 2.4 Site Disturbance The entire project boundary, 1.97 acres. However, the total disturbance area affected by the various construction activities associated with this project, particularly grading, is larger, encompassing approximately 2.3 acres. 2.5 Existing Data ' In order to complete the associated construction plans, a topographical survey of the site was completed. This survey consisted of field measurements made by Northern Engineering. Field surveys were completed the winter of 2012. ' In addition to the field survey, the Natural Resources Conservation Service (NRCS) Soil Survey was used to determine existing soil types found on -site. According to the NRCS Soil Survey, the site consists of Paoli fine sandy loam, which falls into Hydrologic Soil Group B. ' More site -specific exploration found varying materials including sandy clay with occasional sand layers and sandy gravel Please see the Geotechnical Engineering Report by Terracon Consultants, Inc. for additional information. ' 2.6 Existing Vegetation The existing site vegetation consists primarily of native and non-native grasses. These grasses naturally grow in clumps, which inevitably leads to some bare areas. In general, the site has approximately 50% vegetative cover, which allows minimum ground erosion. It is highly recommended that pre -construction photos be taken to clearly document vegetative conditions prior any disturbance activities. ' 2.7 Potential Pollution Sources As is typical with most construction sites, there are a number of potential pollution sources which could affect water quality. It is not possible for this report to identify all materials that will be used I or stored on the construction site. It is the sole responsibility of the Contractor to identify and properly handle all materials that are potential pollution sources. The following are some common examples of potential pollution sources: 1 • Exposed and stored soils • Management of contaminated soils • Off -site tracking of soils and sediment • Loading and unloading operations • Outdoor storage of building materials, fertilizers, chemicals, etc. • Vehicle and equipment maintenance and fueling • Significant dust or particulate generating processes • Routine maintenance activities involving fertilizers, pesticides, detergents, fuels, solvents, oils, etc. • On -site waste disposal practices (waste piles, dumpsters, etc.) • Concrete truck/equipment washing ' Non -industrial waste sources that may be significant, such as worker trash and portable toilets • Uncovered trash bins • Other areas or procedures where potential spills can occur • Stockpiling of materials that can be transported to receiving waterway(s) 1 Stormwater Management Plan 3 NORTHERN ENGINEERING Legacy Senior Residences 1 2.8 Non-stormwater discharges The Stormwater Construction Permit only covers discharges composed entirely of stormwater. Exceptions include emergency fire fighting activities, landscape irrigation return flow, uncontaminated springs, construction dewatering (caused by storm events) and concrete washout water. Proper treatment and use of BMPs is still required for these exceptions when available. The discharge of pumped stormwater, ONLY, from excavations, ponds, depressions, etc, to surface waters, or to a municipal storm sewer system is allowed by the Stormwater Construction Permit, as long as the dewatering activity and associated BMPs are identified in the SWMP are implemented in accordance with the SWMP. _ ' Aside from the exceptions noted above, non-stormwater discharges must be addressed in a separate permit issued for that discharge. If groundwater is encountered, and dewatering is required, a Construction Dewatering Permit must be acquired from the Colorado Department of Public Health and Environment. A copy of the dewatering permit application and instructions has been included with Appendix D. 1 1 1 1 1 1 1 1 1 2.9 Receiving Waters Stormwater runoff from the project area will generally sheet flow into a system storm drains and will be captured by a water quality pond on the northeast corner of the site. The pond will release into the Cache La Poudre River, which is just north of the project site. Proposed drainage patterns follow the historic drainage course. Stormwater Management Plan 4 NORTHERN ' ENGINEERING Legacy Senior Residences 3.0 Stormwater Management Controls 3.1 SWMP Administrator A SWMP Administrator must be designated in conjunction with the Stormwater Permit. This person ' shall be responsible for developing, implementing, maintaining, and revising the SWMP. The SWMP Administrator will also be the contact for all SWMP-related issues and will be the person responsible for the accuracy, completeness, and implementation of the SWMP. The Administrator ' should be a person with authority to adequately manage and direct day-to-day stormwater quality management activities at the site. ' The SWMP Administrator for this site is to be determined: Name: Company: Phone: E-mail i3.2 Best Management Practices (BMP's) for Stormwater Pollution Prevention Beginning from mobilization, and throughout the entire construction of the buildings, erosion control ' devices shall be installed to ensure minimal pollutant migration. These erosion control devices may be installed in phases, or not at all, depending on actual conditions encountered at the site. It is the responsibility of the Contractor to make the ultimate determination as to what practices should 1 be employed and when. Best Management Practices (BMPs) are loosely defined as a method, activity, maintenance procedure, or other management practice for reducing the amount of pollution entering a water body. The term originated from rules and regulations in Section 208 of the Clean Water Act. Details for Structural and Non -Structural BMPs have been included in Appendix B. These details should be used for additional information on installation and maintenance of BMPs specified in this report. It is also intened to serve as a resource for additional BMPs that may be appropriate for the site that have not specifically been mentioned in the report. 3.3 Structural Practices for Erosion and Sediment Control Structural BMPs are physical devices that are implemented to prevent erosion from happening or to limit erosion once it occurs. These devices can be temporary or permanent, and installation of ' individual components will vary depending on the stage of construction. A table depicting construction sequence and BMP application/removal has been placed on the "Dynamic Site Plan" to help document the implementation of these BMPs. Refer to the Stormwater Management Plan Static Site Plan in the Appendix for the assumed location of all BMPs. Construction Details for Temporary BMPs are located in the Appendix for reference. Again, the final determination for which BMP's will be installed, where they will be located and ' when they will be installed shall be made by the Contractor, along with all documentation throughout the construction process. 1 Stormwater Management Plan 5 1 NORTHERN ' ENGINEERING Legacy Senior Residences Silt Fencing (Phase 1) Silt fencing shall be provided to prevent migration of sediment off -site or into adjacent properties. All silt fencing shall be installed prior to any land disturbing activity (stockpiling, ' stripping, grading, etc.). Silt fencing is to be installed prior to site excavation or earthwork activities. Inspections of the silt fence should identify tears or holes in the material, and should check ' for slumping fence or undercut areas that allow flows to bypass the fencing. Damaged sections of fencing should be repaired or replaced to ensure proper functioning. Sediment accumulated behind the silt fence should be removed to maintain BMP effectiveness, ' typically before it reaches a depth of 6 inches. At a minimum, it is suggested that silt fencing shall be located along the northern boundary of the disturbance area to prevent sediment from leaving the site and entering Cache La Poudre. Sediment Control Log — aka "Straw Wattles" (Phase 1) ' A Sediment Control Log is a linear roll made of natural materials, such as straw, coconut fiber, or other fibrous material trenched into the ground and held with a wooden stake. Sediment Control Logs can be used in many instances. Examples include perimeter control for stockpiles, as part of inlet protection designs, as check dams in small drainage ways, or on disturbed slopes to shorten flow lengths. Sediment Control Logs should be inspected for excess sediment accumulation. Sediment ' should be removed prior to reaching half the height of the log. At a minimum, Sediment Control Logs should be used around soil stockpiles and for inlet protection in unpaved areas of the site. ' Sediment Trap (Phase 1) A sediment trap shall be provided at the outlet structures of all water quality and/or detention ponds in order to prevent the migration of sediment into the downstream receiving storm system, channel, or natural watercourse. Sediment trap(s) shall be installed upon completion of the water quality pond and/or detention pond outlet structure. A sediment trap consists of gravel placed at the outlet of a water quality pond and/or detention pond. A 1h-inch wire mesh is placed as filter between the outlet pipe or outlet structure. The wire mesh prevents the transport of gravel into the outlet pipe and downstream receiving system. Sediment traps should be inspected for sediment accumulation, and sediment removed when roughly 12-inches of sediment has accumulated at the sediment trap. Vehicle Tracking Control Pads (Phase 1) Vehicle tracking control pads shall be provided to minimize tracking of mud and sediment onto paved surfaces and neighboring roadways. All vehicle tracking control pads shall be ' installed prior to any land disturbing activity (stockpiling, stripping, grading, etc.). Location of vehicle tracking control pads will be located at any and all existing and future vehicle accesses being used during any of the construction phases. These locations will primarily be ' dictated by gates or openings in the temporary construction fencing that is expected to be installed. Vehicle tracking control pads are to be installed prior to site excavation or earthwork activities. Vehicle tracking pads should be inspected for degradation and aggregate material should be ' Stormwater Management Plan 6 NORTHERN ' ENGINEERING Legacy Senior Residences 1 replaced as needed. If the area becomes clogged with water, excess sediment should be removed. Aggregate material should remain rough, and at no point should aggregate be allowed to compact in a manner that causes the tracking pad to stop working as intended. ' Suggested locations for vehicle tracking pads are at the access to the site from the existing Linden Street on the east. Curb Inlet Protection (Phase I & II) 1 Curb inlet protection shall be provided for existing curb inlets to prevent sediment transport from adjacent earthwork disturbance. Installation of these filters shall occur before adjacent ' earthmoving activities (Phase I implementation). Wattle type filters are to be implemented for new and existing inlets where asphalt is not yet installed. For these inlets, if pavement is constructed adjacent to the structure or if the area adjacent to the inlet is changed such that the wattle type filter is no longer effective, it shall be the responsibility of the Contractor to ' ensure that an appropriate method is used instead. For example, the wattle filter could be reused, or a gravel -block inlet filter may be installed. It will be left to the discretion of the Contractor as to whether replacement of any inlet filter is necessary. Inlet protection should be inspected regularly for tears that can result in sediment entering an inlet. Inlet protection should also be inspected for sediment accumulation upstream of the inlet, and sediment should be removed when the less than half of the capacity is available, or per manufacturer specifications. The Contractor shall also provide inlet protection for all newly constructed inlets as they are built (Phase II implementation). ' Concrete Washout Area (Phase 11) A concrete washout should be provided on the site. The washout can be lined or unlined excavated pits in the ground, commercially manufactured prefabricated containers, or aboveground holding areas. The concrete washout must be located a minimum of 400 feet from any natural drainage way or body of water, and at least 1000 feet from any wells or drinking water sources. Washout areas should not be located in an area where shallow groundwater may be present.. Contractor shall clearly show the desired location and access to the Concrete Washout Area on the Stormwater Management Plan - Dynamic Site Plan. Contractor shall place a Vehicle Tracking Pad if the selected location for the Concrete 1 Washout Area is detached from pavement. Clear signage identifying the concrete washout should also be provided. The Concrete Washout Area should be inspected regularly. Particular attention should be paid to signage to ensure that the area is clearly marked. Confirmation that the washout is being used should also be noted to ensure that other undesignated areas of the site are not being used incorrectly as a concrete washout. ' Riprap (Phase II) Considered a permanent BMP, riprap pads will be provided to prevent long term erosion and scour at the outlets of storm lines and other critical scour locations. Riprap pads will be placed at specified storm sewer outfalls and other critical locations as soon as possible following construction of the respective facility. The riprap pads will be inspected regularly and any required maintenance will be performed as discussed in subsequent sections. Permanent/Established Vegetation (Phase IV) Permanent or established vegetation and landscaping is considered a permanent form of ' sediment and erosion control for common open spaces, steep slopes and areas not exposed Stormwater Management Plan 7 NORTHERN ENGINEERING Legacy Senior Residences to prolonged scour velocities, or acute incipient motion bed shear stresses that will create soil erosion, rill formation and subsequent sediment transport. Areas where the previous conditions apply will contain sufficient permanent BMPs, such as riprap and Erosion Control Blankets. Permanent vegetation shall conform with the approved Landscape Plan. In particular, native areas shall be revegetated with native grass and forb species. Seed, Mulch, and tackifier shall be applied in phases throughout construction. Perm anent/Established vegetation defines Phase IV of development. Stormwater Management Plan 8 0 1 NORTHERN ENGINEERING Table 1 — Native Grass Seed Mix Legacy Senior Residences Species Preferred Varieties Seeded Rate (Ibs. per acre, PLS Seeded/acre Leymus Cinereus Great Basin Wilrye Mangar 3. 285,000 Nassella Viridula Green Needlegrass Lodorm 2 362,000 Chnatherum Hymenoides Indian Ricegrass Paloma, Nezpar 1 188,000 Elymus Trachycaulus Slender Wheatgrass Primar, Revenue 2 320,000 Elymus Lanceolatus Thickspike Wheatgrass Critana 3 580,500 Pasco yrum Smithii Western Wheatgrass Arriba, Barton 4 504,000 totals 15 2,239,500 Extended Detention Basins — aka Water Quality Pond (Phase IV) Extended Detention Basins serve to remove sediment and other pollutants from the developed runoff, and are designed for a 40-hour dry extended detention basin. The 40- hour release time is considered to be sufficient to allow for settlement of most suspended solids and follows the design procedure specified by the Urban Storm Drainage Criteria Manual, Volume 3. The Extended Detention Basins typically have a water quality outlet structure and a water quality plate that restricts flow from the pond to allow enough time (generally 40 hours) for particulates to precipitate out of the developed stormwater. Regular maintenance and cleaning of the water quality plate and structure will be required to remove trash and organic material. ' 3.4 Non -Structural Practices for Erosion and Sediment Control Non -Structural BMPs are practices or activities that are implemented to prevent erosion from ' happening or to limit erosion once it occurs. These BMPs can be a practice resulting in physical change to the site, such as mulching or slope stabilization. They can also result in behavioral changes on the site, such as changes to construction phasing to minimize exposure to weather elements, or increased employee awareness gained through training. Protection of Existing Vegetation (Phases I -IV) Protection of existing vegetation on a construction site can be accomplished through ' installation of a construction fence around the area requiring protection. In cases where upgradient areas are disturbed, it may also be necessary to install perimeter controls to minimize sediment loading to sensitive areas such as wetlands. ' Trees that are to remain after construction is complete must be protected. Most tree roots grow within the top 12"-18" of soil, and soil compaction is a significant threat to tree health. As such, particular care should be taken to avoid activities within the drip -line of ' the tree. Direct equipment damage should also be prevented. The most effective way to ensure the health of trees is to establish a protection zone at the drip -line of the tree to prevent unintended activity in the area directly surrounding the tree. Fencing should be inspected and repaired when needed. If damage occurs to a tree, an arborist should be consulted on how to care for the tree. If a tree is damage beyond repair, the City Forester should be consulted on remediation measures. Stormwater Management Plan 9 NORTHERN ' ENGINEERING Legacy Senior Residences ' Stockpile Management (Phases 1-III) Stockpile management should be utilized to minimize erosion and sediment transport from soil stockpiles. In general, soil stockpiles should be located a minimum of 100 feet from any drainage way and 50 feet from any storm sewer inlets. Where practical, choose a stockpile location that will remain undisturbed for the longest period of time as the phases of construction progress. Sediment control BMPs should be placed around the perimeter of the stockpile, and a designated access point on the upstream side of the stockpile should be identified. BMPs such as surface roughening, temporary seeding, mulching, erosion control blankets, or soil binders should be used to stabilize the stockpile surface. ' As a part of stockpile management, regular inspections of the perimeter controls should be completed. If BMPs have been utilized to stabilize the surface of the stockpile, they should be inspected and repaired as needed. Wind Erosion/Dust Control (Phase I -IV) Wind Erosio'n and Dust Control BMP's help to keep soil particles from entering the air as a result of land disturbing construction activities. Examples include use of a water truck or irrigation/sprinkler system to wet the top layer of disturbed soil, seeding and mulching, soil binders, or wind fences. ' If a water truck or irrigation/sprinkler system is utilized, monitoring to ensure that sufficient water is applied is crucial to ensuring soil particles don't become airborne. Equally important is monitoring for overwatering, as too much water can lead to increased erosion. ' Good Housekeeping Practices (All phases) Good housekeeping practices that will prevent pollution associated with solid, liquid, and hazardous construction -related materials and wastes should be implemented throughout the project. Examples of good housekeeping include providing an appropriate location for waste ' management containers, establishing proper building material staging areas, designating paint and concrete washout areas, establishing proper equipment/vehicle fueling and maintenance practices. Development of a spill prevention and response plan is another example of Good Housekeeping practices that should be used on the project. The following items are detailed examples of some of the good housekeeping practices that should be utilized throughout the project. It should be noted that a complete list of practices and detailed discussion regarding good housekeeping has been included with Appendix B, sheets GH-1 — GH-6. ' Street Sweeping and Vacuuming — Street sweeping and vacuuming should be used to remove sediment that has been tracked onto adjacent roadways. Roadways should be inspected at least once a day, and sediment should be removed as needed. A check of inlet protection should be completed after sweeping to ensure nothing was displaced during sweeping operations. Waste Management — Designate trash and bulk waste collection areas on -site. When ' possible, materials should be recycled. Hazardous material waste should be segregated from other solid waste. Waste collection areas should be located away from streets, gutters, watercourses, and storm drains. Dumpsters should be located near site entrances to minimize traffic on disturbed soils, and they should be placed on a level soil surface. ' Establish Proper Building Material Handling and Staging areas — Clearly designate site areas for staging and storage of building materials. Provide appropriate BMPs to ensure that spills ' or leaks are contained. ' Stormwater Management Plan 10 NORTHERN ' ENGINEERING Legacy Senior Residences ' Establish Proper Equipment/Vehicle Fueling and Maintenance Practices — If needed, create a clearly designated on -site fueling and maintenance area that is clean and dry. Provide appropriate BMPs to ensure that spills or leaks are contained. 3.5 Phased BMP Installation t 1 1 1 1 1 1 1 1 1 1 1 1 It is important to recognize the four (4) major Development Phases as defined by the State of Colorado's Stormwater Discharge Permit (SDP). These four development phases (referred to as Sequencing by the City of Fort Collins) have been distinguished to aid in the appropriate timing of installation/implementation of BMPs at different stages of the construction process. These phases are described as follows: Phase / — Grading Stage; BMPs for initial installation of perimeter controls Phase /I — Infrastructure Stage; BMPs for utility, paving and curb installation Phase I// — Vertical Construction Stage; BMPs for individual building construction. Phase IV — Permanent BMPs and final site stabilization. The following is a rough estimate of the anticipated construction sequence for site improvements. The schedule outlined below is subject to change as the project progresses and as determined by the General Contractor. Table 2 — Preliminary Permit and Construction Schedule BMP-PHASE BEGINNING ENDING OF TASK DATE DATE DEVELOPMENT Development Construction Permit Issued by City of Fort Collins Aug. 2012 1 Sept. Overlot Grading Aug. 2012 2012 1 Nov. Utility Installation Sept. 2012 2013 II May Building Construction Nov.2012 2013 III Sept. Final Stabilization May 2013 2013 IV Included in the back map pockets are five Site Plans: a "Static" Site Plan and four "Dynamic" Site Plans (one for each phase of construction). The "Static" plan serves to display the overall management plan all at once. However, proper implementation of BMPs does not occur at once, and certain BMPs may move location in the construction process; therefore, the "Dynamic" Site Plans are intended for the Contractor to write in the BMP symbols to document the location and time the BMPs are installed and maintained throughout the entire construction process. 3.6 Material Handling and Spill Prevention Potential pollution sources, as discussed in earlier sections, are to be to be identified by the Contractor. Spill prevention procedures are to be determined and put in place prior to construction by the Contractor. A spill and flooding response procedure must also be determined and put in place prior to construction by the Contractor. Additionally, steps should be taken to reduce the Stormwater Management Plan 11 1 u NORTHERN ENGINEERING Legacy Senior Residences potential for leaks. and spills to come in contact with stormwater runoff, such as storing and handling toxic materials in covered areas or by storing chemicals within berms or other secondary. containment devices. A notification procedure must be put in place by the Contractor, by which workers would first notify the site construction superintendent, who would then notify the SWMP Administrator. Depending on the severity of the spill, the site construction superintendent and SWMP Administrator would possibly notify the Colorado Department of Public Health and Environment - Water Quality Control Division, downstream water users, or other appropriate agencies. The release of any chemical, oil, petroleum product, sewage, etc., which enter waters of the State of Colorado (which include surface water, ground water, and dry gullies or storm sewers leading to surface water) must be reported immediately to the Division's emergency spill reporting line at (877) 518-5608. All spills that will require cleanup, even if the spill is minor and does not need to be reported to the state, should still be reported to the City Utilities office at.970-221-6700. While not expected with this project, it will be the responsibility of the Contractor to designate a fueling area and take the necessary precautions to ensure that no stormwater pollution occurs in the event that a fueling area is needed. Fueling areas shall be located a minimum 100 feet from all drainage courses. A 12-inch high compacted earthen ridge capable of retaining potential spills shall enclose fueling areas. Other secondary containment devices can be used instead of the earthen ridge. The area shall be covered with a non -porous lining to prevent soil contamination. Printed instructions for cleanup procedures shall be posted in the fueling area and appropriate fuel absorbents shall be available along with containers for used absorbents within the fueling area. 3.7 Dedicated Concrete or Asphalt Batch Plant There are not any dedicated concrete or asphalt batch plants anticipated with this project. In the event that a plant is needed, the Contractor should be aware that additional permitting will be required. In particular, an Air Pollutant Emission Notice (APEN) will need to be obtained from CDPHE. 3.8 Vehicle Tracking Control In addition to the vehicle tracking pads discussed previously, additional measures can be taken to minimize and control sediment discharges from the site due to vehicle tracking. These measures can include fencing around the site to control access points. Regular street sweeping can also be used to minimize the transmission of sediment from the site due to vehicles leaving the site. The use of gravel parking areas and wash racks can also be implemented to ensure minimal vehicle tracking from the site. 3.9 Waste Management and Disposal ' It will be the responsibility of the Contractor to designate a concrete truck chute washout area and to clearly identify that area. Detailed information about the design and maintenance of the Concrete Washout can be found under the Structural Practices section of this report. At no time should untreated wash water be allowed to discharge from the site or to enter a storm drain system or ' stream. Upon completion .of construction activities the concrete washout material shall be removed and properly disposed of prior to the area being restored. Any waste material that currently exists on the site or that is generated by construction will be disposed of in such a manner as to not cause pollutants in stormwater discharges. If waste is to be stored on -site, it shall be in an area located a minimum of 100 feet from all drainage courses. Whenever waste is not stored in a non -porous container, it shall be in an area enclosed by a 12- inch high compacted earthen ridge or some other approved secondary containment device. The area Stormwater Management Plan 12 1 1 1 1 NORTHERN ENGINEERING Legacy Senior Residences shall be covered with a non -porous lining to prevent soil contamination. Whenever precipitation is predicted, the waste shall be covered with a non -porous cover, anchored on all sides to prevent its removal by wind, in order to prevent precipitation from leaching out potential pollutants from the waste. On -site waste disposal practices, such as dumpsters, should be covered or otherwise contained as to prevent dispersion of waste materials from wind. It shall also be the responsibility of the Contractor to maintain a clean jobsite as to prevent dispersion of waste material and potential pollutants into adjacent properties or waterways. The location of, and protective measures for, temporary restroom facilities shall be the responsibility of the SWMP Administrator. 3.10 Groundwater and Stormwater Dewatering The BMPs selected for construction dewatering vary depending on the site -specific features, such as soils, topography, discharge quantities, and discharge location. Typically, dewatering involves pumping water from an inundated area to a BMP, prior to the water being released downstream into a receiving waterway, sediment basin, or well -vegetated area. Acceptable BMPs included discharging water into a sediment trap or basin, using a dewatering filter bag, or using a series of sediment logs. A settlement tank or an active treatment system can also be utilized: Another commonly used method to handle the pumped water is the "sprinkler method," which involves applying the water to vegetated areas through a perforated discharge hose. Dispersal from a water truck for dust control can also be used to disperse the pumped water. Stormwater Management Plan 13 7 LI NORTHERN ' ENGINEERING Legacy Senior Residences ' 4.0 Final Stabilization and Long -Term Stormwater Management 4.1 Final Stabilization All disturbed areas will be seeded, crimped and mulched. As defined by the Colorado Department of Public Health and Environment in the General Permit Application for Stormwater Discharges, "Final stabilization is reached when all soil disturbing activities at the site have been completed, and uniform vegetative cover has been established with a density of at least 70 percent of pre - disturbance levels or equivalent permanent, physical erosion reduction methods have been employed." ' 4.2 Long -Term Stormwater Management The primary method of long-term stormwater management will be the use of a concrete outlet structure and a water quality pond. The outlet structure shall be designed in a manner that allows ' smaller, more frequent rainfall events to be detained and released over an extended amount of time. This extended detention allows suspended sediment and pollutants to settle from the water prior to entering drainage facilities downstream of the site. In addition to the water quality pond, riprap will be placed at the outlets of all storm sewer pipes, curb cuts, drainage pans, and similar concentrated discharge points in order to prevent erosion. All disturbed areas will receive permanent paving or will be vegetated per the Landscape Plan. All ' stormwater runoff from paved surfaces and rooftops is released through a vegetated Swale prior to reaching the water quality pond. Therefore, the disconnection of impervious areas combined with the detention pond design, offer significant water quality enhancement, and will serve the long-term stormwater management goals for this project. 1 1 1 ' Stormwater Management Plan 14 NORTHERN ENGINEERING ' Legacy Senior Residences 5.0 Inspection, Maintenance and Record Keeping 5.1 BMP Inspection All temporary erosion control facilities shall be inspected at a minimum of once every two (2) weeks and after each significant storm event or snowmelt. Repairs or reconstruction of BMPs, as necessary, shall occur as soon as possible in order to ensure the continued performance of their ' intended function. It is the responsibility of the SWMP Administrator to conduct bi-weekly inspections, maintain BMPs if needed, to keep records of site conditions and inspections, and to update the SWMP as necessary. The construction site perimeter, disturbed areas, all applicable/installed erosion and sediment ' control measures, and areas used for material storage that are exposed to precipitation shall be inspected for evidence of, or the potential for, pollutants entering the drainage system. Erosion and sediment control measures identified in the SWMP shall be observed to ensure that they are ' operating correctly. Particular attention should be paid to areas that have a significant potential for stormwater pollution, such as demolition areas, concrete washout locations, and vehicle entries to the site. The inspection must be documented to ensure compliance with the permit requirements. ' 5.2 BMP Maintenance Any BMP's not operating in accordance with the SWMP must be addressed as soon as possible, ' immediately in most cases, to prevent the discharge of pollutants. If modifications are necessary, such modifications shall be documented so that the SWMP accurately reflects on -site conditions. The SWMP needs to accurately represent field conditions at all times. ' Uncontrolled releases of mud, muddy water, or measurable amounts of sediment found off -site will be recorded with a brief 'explanation of the measures taken to clean-up the sediment that has left the site, as well as the measures taken to prevent future releases. This record shall be made ' available to the appropriate public agencies (Colorado Department of Public Health and Environment, Water Quality Control Division; Environmental Protection Agency; City of Fort Collins; etc.) upon request. Preventative maintenance of all temporary and permanent erosion control BMPs shall be provided in order to ensure the continued performance of their intended function. Temporary erosion control measures are to be removed after the site has been sufficiently stabilized as determined by the City of Fort Collins. Maintenance activities and actions to correct problems shall be noted and recorded during inspections. Inspection and maintenance procedures specific to each BMP identified with this SWMP are ' . discussed in Section 3. Details have also been included with Appendix B. 5.3 Record Keeping ' Documentation of site inspections must be maintained. The following items are to be recorded and kept with the SWMP: ' • Date of Inspection Name(s) and title(s) of personnel making the inspection • Location(s) 'of sediment discharges or other pollutants from the site • Location(s) of BMP's that need to be maintained ' Location(s) of BMP's that failed to operate as designed or proved inadequate • Locations(s) where additional BMP's are needed that were not in place at the time of inspection • Deviations from the minimum inspection schedule • Descriptions of corrective action taken to remedy deficiencies that have been identified Stormwater Management Plan 15 NORTHERN ENGINEERING ' Legacy Senior Residences • The report shall contain a signed statement indicating the site is in compliance with the permit to the best of the signer's knowledge and belief after corrective actions have been taken. Provided within Appendix E of this SWMP is an Example Inspection Log to aid in the record keeping of BMP inspections and maintenance. Photographs, field notebooks, drawings and maps should be included when appropriate. In addition to the Inspection Log, records should be kept documenting: ' BMP maintenance and operation • Stormwater contamination • Contacts with suppliers Notes on the need for and performance of preventive maintenance and other repairs ' • Implementation of specific items in the SWMP • Training events (given or attened) • Events involving materials handling and storage ' Contacts with regulatory agencies and personnel • Notes of employee activities, contact, notifications, etc. ' Records of spills, leaks, or overflows that result in the discharge of pollutants must be documented and maintained. A record of other spills that are responded to, even if they do not result in a discharge of pollutants, should be made. Information that should be recorded for all occurrences includes the time and date, weather conditions, reasons for the spill, etc. Some spills may need to ' be reported to authorities immediately. Specifically, a release of any chemical, oil, petroleum product, sewage, etc., which may enter waters of the State of Colorado (which include surface water, ground water and dry gullies or storm sewers leading to surface water) must be reported to the CDPHE. Additionally, the "Dynamic Site Plan" is intended to be a "living" document where the SWMP Administrator can hand write the location of BMPs as they are installed to appropriately reflect the current site conditions. Also on the "Dynamic Site Plan" is a "Table of Construction Sequence and ' BMP Application/Removal" that the SWMP Administrator can use to document when BMPs were installed or removed in conjunction with construction activities. These items have been included as ' an aid to the SWMP Administrator, and other methods of record keeping are at his or her discretion. This Stormwater Management Plan (both the text and map) is not a static document. It is a dynamic device intended to be kept current and logged as ' construction takes place. It shall be the responsibility of the SWMP Administrator and/or the permit holder (or applicant thereof) to ensure the plan is properly maintained and followed. Diligent administration is critical, including processing ' the Notice to Proceed and noting on the Stormwater Management Plan the dates that various construction activities occur and respective BMPs are installed and/or removed. LJ Stormwater Management Plan 16 1 1 1 1 NORTHERN ENGINEERING Legacy Senior Residences 6.0 Additional SWMP and BMP Resources Urban Drainage and Flood Control District Urban Storm Drainage Criteria Manual - Volume 3 "Best Management Practices" Colorado Department of Transportation Erosion Control and Stormwater Quality Guide BMP Field Academy EPA Menu of BMP's Construction Site Storm Water Runoff Control International Stormwater Best Management (BMP) Database Rocky Mountain Education Center Rocky Mountain Education Center Red Rocks Community College, Lakewood Keep It Clean Partnership Boulder Stormwater Management Plan 17 NORTHERN ENGINEERING Legacy Senior Residences References 1. City of Fort Collins Landscape Design Guidelines for Stormwater and Detention Facilities, November 5, 2009, BHA Design, Inc. with City of Fort Collins Utility Services. 2. Soil Resource Report for Larimer County Area, Colorado, Natural Resources Conservation Service, United States Department of Agriculture. 3. Urban Storm Drainage Criteria Manual, Volumes 1-3, Urban Drainage and Flood Control District, Water Resources Publications, LLC., Denver, Colorado, Updated November 2010. 4. Fort Collins Stormwater Criteria Manual, City of Fort Collins, Colorado, as adopted by Ordinance No. 174, 2011, and referenced in Section 26-500 (c) of the City of Fort Collins Municipal Code. 5. Downtown River District Final Design Report, February 2012, Ayres Associates. 6. Geotechnical Engineering Report, Keifer Concrete Storage Yard, February 1, 2011, Terracon Consultants, Inc. Stormwater Management Plan ig No Text EROSION CONTROL NOTES. A SHO ULD OULD BE NOTED THAT µY EROSION COMFORTCOMFORTM PLAN SERVES ONLY AS A GUIDELINE TO CPItRACTPR STALING INO/DR PHASING OF BEST MANAGEMENT PRALnCES (BMPe) IS EIAECTm. ADDITIONAL AM/DR DIFFERENT BMPe FROM THOSE ORIGINALLY DEPICTED MAY BE NECESSARY WRING CGNSTRUCTM WE TO CONFINING SITE COARTRONs OR AS REWIRE➢ BY LOCAL AUTHOMMES. 0, THE CONTENT SHALL BE RESPONSIBLE FOR ALL PMWMNG (CITY. STATE SUBSTANCE MOUNT. ETC) ALA WNPUANCE sI GONER LNG AUTXtltITES IT STALL BE THE RESPIXHyBNTY K THE CONTRACTOR VIS PERM! NUMBER) TO ENSURE EROSION CONTROL MEASURES ARE IN NNIALY MUNTMINEE) AND MILONET. C CONTRACTOR SHALL MRLMENT ME APPROPRIATE EROSION CONTROL MEASURES ACCORDING ME THE WXs1RLHCTg14WENCING AND LREl OR STE STABILIZATION. D. CONTRACTOR STALL IMPLEMENT APPROPRIATE PROMOTIONLEPROMOTIONPROMOTIONFOR ALL SERUM DRAINS. SWAES, PpIDS AND RUN GARDENS UNTIL STV IS FULLY STANTON E. INLET MOTECT N STALL BE ADAPTED AS NECESSARY, TO THE SURRWNA'NC N FATE TYPE AND CONDEMN (Le STARE-DMNEH WAITES FEW BARE SOl SAND BAGS OR BRAWL SCI FEW PAVEMENT. ERG) F CONTRACTOR 15 RESPONSOLE OUR STABUTNO ALL SLOPES PARTICULARLY THOSE sTETPER MAN G:H. COME,MULCHNG. HYDRO MU EROSION MAT; TEMPORARY WRGATIM ApOTMAL WATTES ON SILT FENCING ' MAY BE NECESSARY TO ESTAR SN NEGETARME COVER AND STABILIZE ME SLOM C. ADWTWK WATRq SILT FENCE, OR OMEN AT NO TIME MAY BE SEDIMENT TO TSHRE MAT EACH BUILDING LAND \\ ST STABILZED MPWGHWt COI4TRUCT W. T NO iME SHALL SETMENT BE ALLOWED i0 MUSS NE PUBDL UEwa 5 FLAILING FALZLLES SMALL BE H. AL BODY OF WATER, WITLAXDE NATURAL DRAINAGE WWAY OH MANMADE DRAINAGE WA ATED AT LEAST ONE HUNDRED (1 ME FUEL MET NTµ S AND NATUR NELMG AREA MUST WE SET IN A CONTAINMENT ARG MAT MIL NOT ALLOW A FUEL SPILL TO DIRECTLY OW, SEEP , RUN OE, OR BE WANTED INTO A BODY OF WATER, NETAND CW DRAM ACE WAY. I. CONSTRUCTION WASTE STORAGE (CONNIVER) AND PORA$E IMITATOR UNITS (CWSINUCTW LNUM) SHAL BE LOCATED AT LEAST FORT' (AM FEET FROM µY STORMWATER INLET, MELANIE,OR DRAINAGE WAY. SAID FACILITIES MUST BE Si IN A CONTAINMENT AREA MAT WILL NOT ALLOW POLUTµTS TO DIRECTLY ROW DEEP RUN OF. CW BE WASHED ROD A BRADY BE WATER NETLAYB M LRANAGE WAY, WYPSIERS SHALL BE LOCATED ON MT STABLE GROUND FO CONSTRUCTOR TOILETS sm ll K STµ B DOWN. CONSTRUCTOR STAGAIG IS LLY EXPECTED TO OCCUR ON TRACT A MIS INCLUDES TEMPORARY WILL J. STOCKPILES, MATERIAL STWAGERACCHSTRW ULTMAILERS, WMPSTERS POTABLE [DIETS ETCNCHR BMPe PROPOSED SIOSWALE SHALL BE IMPLEMENTED AND MAINTAINED ACCWONGLY AN SAD CEMPWENTS, AND µµTED AS NECESSARY AS '- C'—N CONSTRUCTION PROG ESSE5 AND/W OCCURS M DraR LOCATIONS. N. ME CONTRACTOR AND ALL SUBCONTRACTORS MILL COOPERATE MAN ME OTYS CWSIRIMTHAV wERECTERS BY M CEASING OPERATORS WHEN WINDS ARE O SUMOENT NELDOITY TO CREATE PLORNG DUST WIN]H, IN THE W IXSPECTOWS CNNION, IS HAZARWOs TO ME RIWC REALM AND WENSARE y I 1 / / MALAWI Id A PROPOSED I 1 BUILDING �� _ FFE.6635 Lu Luw WNW �s - �\ — pLu eaaosm O I � / I 1 - \ ` PRYOSID ICUM OUT _ O 1 IN CIRR W3 STp91 MET - - 1 I 1 1 POUDRE REET- (20' R z m� �© INA \ EACH NORTH iD W 6D FM 'f (M FEET) I IN't- 20R LEGEND: PINNERTY BOUNDARY EAVEMG FIGHT-CF-WAY Ass, Am FAISM0 RUNWAY m�mlm�mlm�m EXISTING MAJOR CONTENTS - A I EASING MINOR COHTWR EN5TW0 STORY SEWER 4lF_i7l�i 1 OURE1 TO RI EASING WOES 1 ' PROPOSED STOR M WENT PROPosfO STORM DRAINAGE WHET jT I PROPOSED COITWRS � ) TEMPORMVBMPS SAT FENCE 1 R O YFHICIE MASKING CONTROL PAD I! _ YT FLEE PROIFCMN ® I RaI ^O WATTLE PROTECTION 1•`.JF' 1 O CONCRETE OC TOSHWT AMA - LOCATOR TO O ] DETERMINED O TBE CEIEIMINN BY CONTRACTOR R 1 MOMENT MAP m 8T PERMANENT MPS 1 1 PLµtEo mvRAP vw ® I I O : g? MPS SHOWN ON THIS PUN ARE GRAPHIC WLLT FREPRESENTATIONSONLY, FINAL - I I RMINATION OF SIZE AND LOCATION SHALL TERMINED BY THE CONTRACTOR ANDMENTED ON THE DYNAMIC SURE PLAN. Sim w l- o GENERAL NOTES: I. RUIµAOBY ALL OsnREp BUDDIESZo CONTRACTOR R RQTpS 1 CP OL1xSU k I Q p 2 TOTAL DIST KD AREA - z] ACRES of 1 SRR "MiS AIM. 1 _ J TO M DETERMINED A CONTRACTOR TO PRONLE NEMCIE FINANCING CONTROL FORT CONCRETE kl WASINNR AREA F ACCESS 15 Off PANEMENT. 'WANK 1 0. ME W EROSION CONTROL NOMSCSON SHEET =1 CE ME �5 UTILITY NUAN SET FOR LF_ RESIDENCES WEPMED BY NANORTHERN ENWILMNG GATED OCTOBER 5, 2012 FEW ADDITIONAL 1 ' , 6. NOTE MAT ALL RILPAP PADS AS SHORN W THIS MAWINO STALL M PLANTER RI%RAP, SEE DETAILS FOR INSTALLATION a PLANTED RNARMALJ- ACOTd TO ME NTEDMOS Rp ME 0.WRREER III{I'll^NII SH.ML RY EROSION CON &AONEfi IICAN Y AME G EEN S75BN ATE0 CO IN(FORMT ED MPR�V. GREEN 5]59N CW APp1pNE0 EWKJ OKR ME TILEE \\ �� ■ 1 am WOOL T i i I 1� I 1 I I I CALL LR.,TY NOTIM ANON CRITICS? Of • ICOLORADO • IO Call CLAN�rW..4NORR wa As Sheet Of 2 Sheets EROSION CONTROL NOTES: A. li SHOULD OF NOTED THAT ANY DAMON CONTROL PUN SERVES ONLY AS A SUPREME TO nC CNnMC1q. SENDING AND/CAI PHASING OF BEST MANAGEMENT PRACnOES (BYP,j M EXPECTED, AMMONAL µDI /�/I gFRAENr BMPo ERaM MOSS aMax/JLr CfPlcrm ulr BE XECESSµY DURING COxSTXOCTRN WE TO CHANGING `,� y^�H� �/.� PO�D�� NORTH SIZE CONDITIONS GTE AS REWIRED BY LOCAL AUMCIRMES. 20 0 20 w 60 Rut B. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ALL PERMITTING (CITY. STATE DISCHARS PEAYIL ETC) AND COMPLIANCE WM COVERING AUTHORITIES. IT SHALL BE THE RE9p19Rlum OF ME CONTRACTOR (OR PERMIT (w FEET ) HOLDER) M ENSURE EROSION CONTROL MEASURES ME PPWERY M INTAINEO AND FO ILYID. ` E NcA . W R. C CONTRACTOR SHALL IMPLEMENT ME APPROPRIATE EROSION CONTROL MEASURES ACCORDING Min THE LEGEND: CONSTRUCTOR SEQUENCING AND FLUFF OF SM STABNRA ON, 0, CONTRACTOR SHALL IMPLEMENT APPROPRIATE INLET PROTECTOR FOR ALL STMM MINING, MALE& POND$ AND PROPERTY BOUNDARY AN GARDENS UNTIL SIZE IS FULLY STABNZED. EwsnNG RIGHT-OF-WAY — E WL£T PROTEc W SHALL BE ADAPTED. AsNDSASNECESSARY. TO ME WEEKS FOR SURFACE TYPE M0 coxmlXN (Ls, I - -" EXISMG FLOODWAY STAKE -DRIVEN WATTLES FOR BARE Sq4 SAND GALS M MALL Y.Ats FOR PAVEMENT. ETC.) -- _ 1 F CONTRACTOR IS RESeOX9BH£ FOR Siµll➢XG ALL SLIMES, pMTWLAPLY THOSE SIEEPFN MAN 6:1. GROUP MAJOR CWTOMP _ MAY BE N HYMO MI ESTABLISH EA09M WT$ E COVER IRRIGATOR. AND SOPS.AORKMAL WAi11F5 M 54i idCLG . I -- - - EpSTNG MINOR CMTWR MAY RE NECESSARY TO ESLMLISX K(£TAn`h CORER AND STMLIZE ME YORE. EXrnxG STMM SMER G. IS STABILIZED RAin£5 9LT ICONS RU OTHETOR. MI NO TIME MAY N XDIMENT E AFFIRMED INSURE ORAL EACH E PURIDING PAD IS siA9LIZEO 1NRWPIWi CONSTRUCTOR. AT NO nYE 91I11 YMYENi BE ALLONFD TO GROSS ME WO1C EpSnxG TREES 9DEWRItS. OUT£ RUER + ^• H TOWNS FACIMES SHALL BE LOCATED AT LEAST ME HUNDRED (HOD) FEET FROM NATURAL PLAY M RATER, 1 I PROPOSED STMM RHR R MRµDNATURAL GRIMACE WAY M MANI DRAINAGE WAY. ME FUEL TANKS AND FUELING AREA MUST BE GET IN A CONTAINMENT AREA MAY RILL NOT NLYN A FUEL SPILL TO DIRECTLY ROW, YFP, RUN OFF, M EF L: \ 1 PROPOSED STMM DRNXAGE INLET l BANNED IBM A PLOT OF SANTA, METAND OR DRAINAGE WAY. 1 \ \ PROPPaED CONTOURS �l4 I. LOCATED AT L AST FIFTY TY (50) (MINISTERS) FROM A ST PORTABLE NLET, R M ND, (CONSTRUCTION . SAID SHALL CUT BE \ \ �/ LOCATED AT LEASE Flm (50) FETE FROM ANY srCRMwAIFR RUST, WETLAND, M DRAINAGE w/.r. SAID FACEIEIEs \ IS SWASHEIS D H70 A CONTAINMENT OF TCH AREA AND OR DRAINAGE WAY. DUMPSTCPS�41 BE LECR�O RUM OFT. N FLAT GH STABLE GROUND, AND CONSTRUCTOR MIETS SHALL W STARED DOW. TEMPORARY BMP'S J. CONSTRUCTOR STAGING IS GENERALLY EXPECTED TO CttUR ON TRACT A HIS INCLUCES TEMPORARY SOL I 1 SILT FORCE STICNPLLES MATERIAL SEMAGE, CONSTRUCTOR TRAILERS, WMPSTEAS PORTABLE iMETS, ETC. PROPER SNP, PROPOSED THOMAS SHALL BE IMPLEMENTED AND MAINTANEO ACCORDINGLY FOR SAID C MPONENT& AND AGAPM) AS NECESSARY AS CONSTRUCTON PROGRESSES AND/M OCCURS IN OMEN LOGnWS I / I I II MNIGE TRACKING CONTROL PAD N. THE CONTRACTOR AND ALL SUBCONTRACTORS RILL COOPERATE MGM ME CTI CONSTRUCTOR IN9•ECTg6 BY 2,SCT CPERAMOs IS H RINDS ARE O WmaINT EN-TH A T�X=ONxc DusT MILCM, IN ME 1 / INSPECTORS Os OPINION, snAZIRDS AE ME W9EN xMELO AND MCEATE. 11 �o INLET W02cnW X PRMU3D - F I wATILF vRORcnW OUTLET smDCELBrt I f Iuwm CONCRETE WASHOUT AREA - O • I 1 FINAL HWAD N TO BE t — _ • Z I 1. DETERMINED BY CONTRACTOR / 9' �J SEGMENT MAP ® BT ' 1� -•��' / R�DDMF D�RAx ---- I 1 PERMANENT BMP'S 1 T 1 . E , I 1 _ _ ^ PLM2D RIPRM PAD O I R a a I RB I NOTE: 1 1 I ALLBMCS SHOWN ON THIS PLAN ARE GRAPHIC s 1 w gpRoyD REPRESENTATIONS ONLY. FINAL DETERMINATION OF SIZE AND LOCATION SHALL PROPOSED F- i SE DETERMINED BY THE CONTRACTOR AND DOCUMENTED ON THE DYNAMIC SITE PLAN. 1 BUILDING,I GENERAL NOTES: FE=BS F.I5 -- _ II 1 A 1. CONTRACTOR SHALL IMMEDIATELY STABN3E ALL DISTURBED SCPES 0 • L I\ a aw. e I BY OMAR MULCHING ON SIMILAR uETgN Z I I W OO p. TOTAL DISTURBED AREA - 2.3 ACRES e\ \/A/\\ • / RMOSFO F l I ]. SOUP AOMINISTRM ROCP MAINTO BE DETERMINED W 1. CONTRACTORPROVIDE VEHICLE EARDRUMS CONTROL fM CMCIEIEQ WASHOUT AREA f ACCESS 15 OFF PAVEMENT. PROPOSED s. $FO I p I UTILITY 'GRA PLAN SET FOR I FGACY SENIOR SHEET CCOI Y ,. STOW GRAN M HERN ENDANGERING DATED OCTOBEER s RESIDENCESROSION CONTROL NOTEr W O lvRFPAREO BY W AMPONAL Z FMunnW. a 1 I r 1 6' BE PLANES WRY ARSEEE DETALSSIFORNINSTTHIS ALLAATIONA OF RANTED III 1 I MPRAPSHALLAM INSTALLMAMMARYMAMMARTO ME YANTED PEROSIONCONTROL BLANKETS RAP ME M PRMOafD (NORTH AMERIGW MEM SZSBN M APPROVED EQUAL) OILER ME CRIB Wi INSTALLED NPAM, 1� V1 1 i I I I AW neH Ir / I I PROPOSED 2-FENOT DRABS 1 _ POUDRE S STREET (ZaN ry w)emmmI I � F CALL UTILITY ENTER OF cCI ING ♦ xlw.wnrsbelDw. cr Cal, oln Nr ,� WHO m APPENDIX B Erosion Control Details No Text �Wb o°s: ffi g m pk' D@b3 ga'�F sKco`� ��so Wa �Wo� mho$ =so WWm2 07 3sz z�mUmb_ o �3F S✓ig3 �aCW$�3F `.b �oili N 3 " S gim w mZ -z 3 W Z w a ua `m b z w � ' w I � N � U P ?� m s aom wa bg _ zyW cm i z . `Sh �}a esa �W V 3a �W W d= �� m3m Z♦ � O •� tF F m x J Zc E ; 3 Uymo �' Wm og«z go as a €g zvmWi 'oz^ bogNu z z ` ZN � u <� Wa a 4 3 »3am<�aWdiz DP. s.soo FSaga� o dmg eLL4� ioo'o<W= ��xS ses �1�03 oSW� �W`-zW �"WF�m<4 "3H,.<�o €""4 sa ".g €�b3gd4F wad ae «< x<��:«�Sm m.W.rv"sham&Y� ^,-gG m2Y o ^ ry 2.d v�3�o3v_i g FLOW 1 FT. V-100 YARD 3/AC 5 FT. mm zwo� E=VAW PBVJPM NT POND BY ES'um= SEDLQIT LOAD FIW OF SPILLWAY 1 1/2 N. AOM ME PLED 12 N. (WL) ABOVE TOP OF PIPE PIPE OUTLET WITH GRAVEL FILTER GENERAL NOTES: 1. SE ff SHALL K REMOVED MIEN ONE HALF OF Im BASH DESIGN DEPTH HAS BEEN FILED. 2. REMOVED SMWff SHALL BE 0006 W N AN AREA 7MMMY 70 A SEDNOff BASH. 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SAIWRE TO NUNN THIS PERWIT MY RESULT IN REP ARCIND OR IELDUTwE TREES ARE HIXD ON CORRELATE OF°ctl PAIRS' THE DEVELOPMENT "`NDTY E"IF�AR STREET THE "::"REwnON T`�"LUE `ISALL.TRIESNEETHAVESEN W:A.B ONTHLAND�E PI.�a�REETPaNTRING WIWL REREQUIRED JLTM AIM wLFAFIfI ATSa PHASEL `ANNOY HER NTux[IT,EESOFTe[oEVEFLOPSNNIFE41EA FOR STREET TREESINn PHASE PLANT REQUIREMENTS uNusDIu.REaWIaE,Rs STREET THREE - -'II USERS FR SNER PARKING LOT UREERS R. TREES EI° HAITIvfNlE- IS PRESS ORT TOTALTOTAL TREES ;RP�ED:n o.°LANOUNImWPEAKFURK6REQUIRED .IN%CONT IE NIw,EN-,exDaERaE W NDi-IG a.elEmP mWNwvTav , N+YE$I eNEnnmm;Ta 9R.® TB�N+PUS I LEGACY SENIOR RESIDENCES FINAL PLAN Fort Collins, ColoI CCRNFflSTPV E ASYCNIEE. LLC zaea. +aW sS.W wm o�.n. xE ee,Da,ms ♦m x,.oem NN LET MmN LWv. CWIINWNWuep aNCvnme,W W'1WI3 PMIWNW +a+alz m-n-tz Landscape Plan 7LS2 Landscape Notes MEANT Brc 7R UP TOFMEEACCEPTµCE, AT a Rvm BBEs'�wksl'w :BAR. wIxNOi"xµic�lµDsrarE.WorsRr rw�kwu BE W.Nw.nEn EORnHorzlEuu vE.Ns.r,Envx.LAmHR � LCONDIToxSSHALLBEM°X°HTTBTHEAr Nrw"°E,HEDWxEnBNEa TAFEW BM EMNGW io"e�"'Y.Tu"x N oY°wE LOxClFrs:w�.il �E,ND�a`w°°° aB"NORYTECAMO5FII"FSEN::rnEEIMMIDDUACILn."BwuN S MA mTM MIEMoreE LO TINGALLUNUULS<SHRS. PRIDRTOMPLExcAVAJENMMANnw. MXn"°wEMTIDNs. URTBE PLANTEDIMMIN MkfNFnNEEO<Cim ERw,W„ER AND IEHDIEERIUMS Ex,EEB1FEET EMETRICLEMPTIM.SIXFLSEWATRMD� ETaI�ffs°naBEC,ME "F.Y fFF ENCOMPASSES wUvE."µ;SCPEMkuo THESE SEMI uWNRSREPRE9E.kmpSIMMONS TO EMBLEM EMBLEM TF HIMx EFr 7 MINIMUM (MENTIONED THREE .Tlwµ ONEACH DUE °EFIRE TOOK RENT CONNECTION SOFT NO VE AE OUaIi THAN ONE` OR RESUME SOVIETS RVNTIN MEN I US 8, IF THERE ONT SHRUM ME LOCATED ON T OR OF TREES) VEN�FlED UTILITIES.IECONTRACTOR M�wLTEY OWNER KE ANY MERGED HAT cOMMENCEO. VENFY VmH DAMEN R AND EEBTxDFnn, 9 ACE MASTERCARD ANDSO NI HE MAIN I A FITw TO FINAL nrAREE. wnw ianw�.u�DNCE BY OMERe �'o N AIL LwNTINCLUDING ' Nn : I.SKERSIYTE AND INwWrIo Vu� WARRANTED E0RMa 01 M. 10. TO ME N,llMUM MEANT FEASIBLE. TOVSOIL THAT IS REMOVED MIOU O]IETRUCTJCN ACTUATE&WL BE CM6ERVED ADS MEET USE W ANSEELF MC REVEOE.ATIaI AND IANDSI:BPRIG. L XEXCAVATESIIm4WNM�oNN RENWED RUPERTLw,cEUEENT AND ROCKS ai SOUL WTFHw.E.OtFA'WTERIaL VEGETATION 1.wDFnn TOM 12 RESUME AFFILIATE MEADOW AWAY FROM FULCRA FMRNWMWS AREA SILOTHTwNsnpx BETWEEN aL ADJACENT EwB WOES ARE gipggED GROWN IA W RAdxO� pRFA4 NEFVi.'MXGBEW.9�MLLBETKMCWNtvtN9ENEDAxOntLE HEMOVE NL W6NTIB1E lw9M� MATERIALS RESTNw',uLCLWCPFE, TUsx. cFM4s. WFEDB. Pmttu.00TTER WASTE AREAS TOAM"xME(TwAST)WISITMNµCNDMLMSNAMENT STSx UOn ORuUrt LYNOR TDWTEOBFAi�LivOFT LEEI)VHO9IGU&CY4E6 OF 9OILAMEMMExT EEL ONE THEMEANDO MI$UJAM FEET OF LwOSWE ARM 14 suRF.GE cwwAEs. CuiaTN90OFTT SS SPOTS F�uN lowsW eANDTFI°u hNlrENNONIITES To�OcawvmMR�E EwI�RFnFCR:.oEOTM IRROuwENMO�s. 3 0 ESWA,CTEDMD FINE MADEDALL ROCKS DEBRIS. WASTE WTERvi u.O VEffrATVY1 WTFAWI if TH.W I?WTLL6RMID FRM ME suRFACE Ax0 REMovED E ROM mTE. OFNOMMECmf°RL9TESB ES EM ENTs SDE"uBSASIgCrt�OME BOA RMIED, vRUIFD . ___S AREA�ELD ON wc:TwREATTOFOCCUPANC ol.wTEEo:A"EILuN. TooBTax TMFsiwMl°T�LM.YRlsur�`aESI w� 17. MEFEE DEVELOPER vwL CONTRACT ME CI FOUR EN. OCCUPANCY STIFF ET TUE MNTII REST AT mE CDWLLIw Of ME H CAFE OF ME ALL FARM NEED TO HAVE BEEN INSTALLED As SEEM ON ME IANDSCAVAO E MAN. ERTR6 OVAL Of DIRECT OFF PLANON0 REQUORED NBEFFEW NNWAPPROVAL OF SEEN PHASE FAILURE TO OBTAIN MITI BY THE ary IOFFERS FOR BONE DOES NAWRITES RACE REaAT N A HERD ON CERTIFICATE OF OCCU ANCY FOR FUTURE RNBFS OF MET DEAUOPMESO B. SED BE I�CMORADO MOMS WRMNRE FEEL FESCUE MEND ME CIFIWLV GROWN FOR LOW WATER WAVE MS WATER TO ISIWRP•ED VNtlEnES. WVINO A IEEETHV N°MWS MOT SYSTEM. WINCE IN RLY WOLEO C MINIMUM "MEOTOy RTOELIMBNME C.. M� ENFMLEWEB. AEM1YfFMIVFAN ME9EN+FASttPs[O FAWS RECOM.EDA AAS,I nE FSTAMIYMFM ArvO N OENµWESTE,R.FOR TEER DEBRIS AWARE AANNDMAANET T¢WOVENIF DEBENTURE STUALLLIS NOSRF.EN MMA�IN A DOWNTOWN w ACCEPTABLE MIGHT FREE MONTH SE ANI FERRY MATTHEWS ME SWISS TO BF MNTEO M AMEHC® SOIL 4E STAKED AS FIREMAN N ACT FOR SUMMIT DENY DOME MEANS ALF MEET AR EACF ED THE CODE AND ORDERED IN MAT LOT M STAND W ES GMRENTLY RECDM.ELEEB BY TE CMDR.DD MM�Rr M„I9.RE MINCED OF RMLNEARENT ME TO SECTIONS WALM. MUNDANE M wAM, ME FINAL MOST BE REMAOPO MM WE OMOI a m4CIEL SWISS APPROVED BY THE CITY. LOCATIONS FROM MAT a TEED ON ME MAINSTREAM MARS M.A. IE TIEAMWDEEOE THE CIFY TIMOR TO INSTALLATION OF xF O BE4N916RM WTFx TIEIRPWFORAxB. IF TIRE SOME 6 GMRICT WITH ME MOISTURE INCEUCEO MERE MAT WTI. YECESAND gNXDTIEBSHALL BEMWAC®. R ALL TREES MAT SHRUM TO BE PALLED WEBMLVPED. MCONIAIHFAffD. ONMEMBLE NOTED STALL vwIT"I FROM FELL NAVE ALL WIRE CAXE MARKETS .BURwAND ALL OMER NM.SmEGRADABIF COxr.RRExrwTERML HOUNK REFUND TO BFNTRDME ACT SHRUB BED mEINAE MM'P RNiBEEL NIMUM 4' NORTH SHREDDEDDEFFENDDMMLLERMNVn�ALL EFFORT SHRUB CWME-A CONTINUOUS YER HE ESCORT ANDSCAPE TREAT AT NOTESWTHA STAPES40C NEELMEGTORS. � ,.%�DGE)MDS�.LSEEFFECTS IEN�}EELMv.TNHMETo OFFMAR E°AMDI`.`cEM MAW DG�GGwIL MONTANE TON. 28 MEMEMEEM FOR THE BOVFLLFTL IFDM MAN. ME'TREEBNDIU ARE OREMAINFERMEDPROTEDWMND,E9MEET EB ORNAMENTAL SENTENCE 9 IEGTO 30 ALL BE NSTALLEDAMORDINGTOD W M�TI�:°MµNERDE,GNEDTO I FA FEWER! BWLEFIIMED EIx25) SOUREDMATHALETERMIMMEDIT NREMCETIEVW ED ME wJDSLNNAP THE ESunxC[CYncMTFlUTEwM0.PAV :CYEMPxv MOMENT BY BEENvnP9E 31 HIM HIC MATURE TREES FORT ARE REMOVED By THE APPERCLUNIF ED MY ANAL OF ME NWKACTING ON THEME SEE OR W AM SCANT SMALL BE RUMEAMED WITH NOT L EST MANJ ONE 0 1 OR ARM NO E?UCENFn TRENDS ewEMIEHT TED ME �MNTE THE L M A OUNIFlEO LVDNAI4IRPIEER MTEINEw HWSSB DUF AN m RMn PRusu DFIHoREMMOTIED. PRMHMITbwHEESRSS�BSOEJRwuRkD JO FPNMEIWouwE WFEMAL TxIS XFIMT Cv M6AlF8 A SMrt D W TANOP CpNHMTE IS. PLEASE USE SECTIONSAAtFUMECARD USE COMFORTWu�TxEFsumNn THE MEMMSCTME�WNTEHABMNEDWITHAMWAAYPAussUlxEsNrTWOFMDYaVTRTEEEHEFSncmT ontED,U�MI.aINESTErtmFw TIE ME mLEs Oro snRLEs FUR tax YEARS mw mE DATE THE EECDImFTUTE DE xclnNEv n esm m eaNE So ^���MNE .mom DM W NONE MmEEMEMTTE ww < MM Notes � M.DRmMNI.b xF,IBLC4..IDx BNY..E Seed Mix WMFMTUrtOBV AVNNBAe VyyEv9EE09IXUMM4.YE[4ORtlOBM0.EVNM. CENUERCO 9®MWLPF,LIXIIME TINT W1ME8TEfdLWMS VASSITTEV ASSEN N'OF A Fl1 AS N Lp " 12 WENB Mto BufFNO�TORA4 10E NNWB T.I IR1fATld1 WTE. Eb W (NICER IOIE(effiLYII®CFI MBEwTErsauowOME WIMEwmATIMAromwWMxM ROTHE SEEceD.REAs MWVMSMUAIMYNCR Iarw Rm AMEMANM(I WTEMEE. wvn arnwAvw`ArwoF`N�Nuls°YBFa�M`sIEN'N'.wln�w mM'R'`naNToieTrovN'aio"rm'OFEE�E�IwE� TIEwEeaE W Inea 1xe u� o MMRwe eawrsrt n wrclrx.Iu� xxMl M nE waeR wTm.am<uo waaR rt O1xE Kl WEAMBLaWINRMAPB11IlER.MDIAMi MP/AFD OIBCATIFb YRpIMTMaeEY. W.NE OULmff.9.NE YAFEMLEIrt IWNa NLIrt.9I➢MI.MM WOR9LFFRHIIMMEIFAm MEYH}f11Ea11VE CF MEEVNIFN}fNYM.ROG•IOIXEMILM1..WlEMMRW AYIMYOETHOFINOE9ME KACw9TIE BLM4 WIEIRPRICIE MDINOYTEIHMIVRIFIPZBCf TE ANCIERWDEMMOrt. ISF➢W 1NE lV 1N>®680EEY➢IYMCYfIME m'OWeIAfMMVOEMNVFDNOMbMk RIAIEWf M xnclEe. wEwEARwr Twauuff wrENAMM.EEW,rx WEI RRO.ELuwMMcwERAREevrWTBMNELBBm CIIREEAOH]II.WFFIEMf.MOM11OEm TEFBBBIEDMIRFI� Details TYPICAL 18" NON -REINFORCED WALL (3" SET BACK - TYPICAL) NO BACK SLOPE BACK SLOPEJff 1 J �¢ IAirtvMF1IOWA FAVOR fEruMD rTLEEVEwuN STpMi "W VVAu rFREE EN.MwS ADDS X6CONTRACTOR 19 10 FOLLOW 'THIS EM,NFACTUVELaTRIALS AND SPECIFICATIONSFORT 1 Typical Modular Block Landscape Wall -2' Maximum Height LS3 - N RUD mwm Vt �IBT t� NON 4TOKV I� �r �I BEEF �/�TIME ,R ®FWFIAFAIILF TxoO TAYF. rtwTae IrI MANMRLMBENLm.INN._A. RErv® FARM i M GROUP 444MAIL AYR I M BLBud,LO�ls V® TBACTUTO LEGACY SENIOR RESIDENCES FINAL PLAN Fort WHILE, CdaaEo •xis ms. i mTd1E MSOcuIES. ELC 2a s.,.N eBNMBem •MIq 1015 1oa tli.NaAJ0W AERIBnyllmtu �ILVM.:�RNMR.o BmN SIR camNll.. 0901912 R.M„M ,n=dl2 0]-11-12 Landscape Notes LS 3 APPENDIX D Copies of Permits/Applications Page 2 of 22 IPermit No. COR-030000 CDPS GENERAL PERMIT STORMWATER DISCHARGES ASSOCIATED WITH ' CONSTRUCTION ACTIVITY AUTHORIZATION TO DISCHARGE UNDER THE 1 COLORADO DISCHARGE PERMIT SYSTEM In compliance with the provisions of the Colorado Water Quality Control Act, (25-8-101 et seq., CRS, 1973 as amended) and the Federal Water Pollution Control Act, as amended (33 U.S.C. 125.1 et seq.; the "Act"), this permit authorizes the discharge of stormwater associated with construction activities (and specific allowable non-stormwater discharges in accordance with Part I.D.3 of the permit) certified under this permit, from those locations specified throughout the State of Colorado to specified waters of the State. Such ' discharges shall'be in accordance with the conditions of this permit. This permit specifically authorizes the facility listed on the certification page (page 1) of this permit to discharge, as of this date, in accordance with permit requirements and conditions set forth in Parts I and II ' hereof. All discharges authorized herein shall be consistent with the terms and conditions of this permit. ' This permit and the authorization to discharge shall expire at midnight, June 30, 2012. Issued and Signed this 3 1st day of May, 2007 ' COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT 1 Janet S. Kieler ' Permits Section Manager Water Quality Control Division SIGNED AND ISSUED MAY 319 2007 ' EFFECTIVE DULY 19 2007 1 1 1 1 1 1 1 1 1 1 1 1 1 1 APPENDIX E Stormwater Management Plan Inspection Log 1 1 1 1 1 1 1 1 1 1 1 1 1 1 APPENDIX F Contractor inserts 1 :l 1 r r APPENDIX G Contractor Inserts 1 1 APPENDIX F FEMA FIRMETTE No Text MAP POCKET DRAINAGE EXHIBIT FEEL OC T BUF CO AN E[ NOTE %RCPOEED BIDSW E 'IA A�Y ti1 I U CAC .. En \. NF�AA EXORTNG MINES S EDGE �, 1 F AN A- I e 1 1 LOSERS BOOM WLLL EUROPE TO OWN & EXISTING SPREAD BUHpOXN (SEE ARE 4s) • EMISRNG TOP OF BANE \ 1 I / ft ft 11 R ® NORTH %D +D WOOL IN FEET ) 1 F[I, _ 20 It LEGEND: PROPERTY BOUNDARY EXISTING RIGHT-OF-WAY EXSTWG FLp'DWAr WSTNG MAOR CCHrq,R EFISTNG MOOR CCADDUR EXISTING STOMA SEMBEA MIMI ONE — EXISTING ME S 4 PROPOSED STORM 2NER I PROPOSED STORM DRAINAGE INLET q PROPOSED CUSTOMERS �S DESIGN DON) Q zl FLOW ARROW ~� a:•Y p t'a ORAINAGE BASIN LABEL IAA 2 p,O DRAINAGE BASIN BOUNDARY Igz €E IdY) 3 s ¢�"5 SOT FENCE W� M RLW `, . �u1 I _ I wlNtc mnaIND caxmw PAD PLANTED RPRM PAD O W CC T W MIEi PROIECTgI I— Z WATTLE PROTECTION Pl JS ® O cJ VlY Z Z W CMCRRaAE WA41Mlr AREA - O RxAL La oETEauINEnaN ro o By caxMACT'm o SEDIMENT TRAP 3T �� a ER eLANNEM (SEEE NO NODEE 6) e) NOTES: 1. REFER TO THE 'PEAL DAMAGE REPORT PER LEWCY SEGMENT ROUSING BY NORTHERN ENGINEERING, DAM OCTc$R 15. 2012 PM IDDITMAL INFORMATION 3. NNE FINISHED PI ELEVAEAS BEGAN ARE ME MINIMUM ELEVADE REWIRED FOR PROrECTON FROM ME 105-YEAR SEEING, YET y¢ 3. WE sX1O1 34.1 OF ME LAND USE CODE FOR A GAEABIE USES BEERiG 4 j 6 ME NIHABITAT SUFFER ZONE 0 A. A FLOC.CPLAIN USE PERMIT DELL BE REQUIRED FOR ME PCNO OUTLET O o PPE MMW RUNDOWN NINE MAT MLE CONSTRUCEE WMM T, C EMA 05-FOOT RCODWAY (,E. IMENSTMO EHIS ro ME EXISTING Y 6 6 RUNDOWN) ELL REWIRE A CRY` NO -RISE CERn11CATO1. CONTRACTOR SHALL CONTACT ME ERY OF EMT COLONS RW3PLAE ADMNISEANAV W FORM ro COxSTRUCOON ro OBTAIN ALL REQUIREMENTS FOR DEMOInM yy OO xI CMSTRUCnON WRIGHT ME FEw OS -PINT FLOODING( `dA BYIY $Y INCLUDING ME REQUIRED PRE-COISTRUCncN SUREY. ONCE 1 CgIS..."UNT MEN ME R0'OWAr IS COMPLETE A MT -CONSTRUCTON SURVEY SHALL GE COLIPEIEO TO ENGAGE MAY THE ELEVATIONS MMIu ME FLOpWAY HAW NOT INCREASES BY MOTE \ MAN O.W-FEEi. S ME FOILOmxG LOODWA NREG `LnQUOS MUST BE MET N. O FILL IS OWED WAY THEM A HKRAUUC ANALYSES SHOW 'No RISE_ -LANDSCAPING MEETS REWIREMENYS FOR NO ENCROACHMENT IN nE R0.MWAY WMOUT A HYEI ANALYSIS i0 SHOW AO RIG'. -NO STORAGE OF MATERIALS OR EQUIPMENT IN THE R0.MWAY. -NO MG CERTIFICATION REQUIRES BOTH FOR PRE-GCNSEUCTON AIL ON WlLt PO�i-GOISIRUCTON FISH THE ANNE OUTLET PIPE ROMAN ANSI, cALLMnL Tv LORI c6NDFR GI NLMV WIY[OBIOW CaIIIWmn E6YaAXa City of Fort Collins Colorado UTILITY PLAN APPROVAL APPROVED: ------� ..'•> euemeer �— CIPLA'ED BY- ��eWeteF Vtil-fy �� GNRI® BY: ORCR® B e)ke� Y ftxrepticp� der-- t7GCAE!] BY: �a e— ,T—C BWLMAVF SLn[oumeptN PleeVI —6ar-- EROSION CONTROL SEXTANTS AS SHOW ON THIS PLAN SMALL BE xdM uEMCAx O"- S]5x EROSION CONTROL SLANUER OR APPRO\ED EQUAL AND SHALE BE INSTALLED PER DETAILS IMMEOATELY AFTER OPENED BAcREBUNG AND SEEDING IS COMPETE. MOTE THAT AU_ MEOWS SMI ME PER APPROVED LANDSCAPE PLANS. MIAMI SUMMARY TABEE eAMn TOM AREA LxrW CID 1:101) D h OyE 30 r ][ al0 (y0 0100 Itl0 1 1 038 053 0.65 fiA 6O 0) Il S ID 0.31 P% I.W 5A 59 l.[ }I 3 3 OM 0I6 O.R 13.] 1]-0 1.6 [J 9 A OS[ OM IOU SA SA Z3 5[ s 5 D.E G6B on Bo xD 0.1 Ds 6 6 0.02 035 031 W 6A OA 0.0 0-09 ED }0 ME 03 RUNN nl C81 O51 0.13 Oq 0.50 11.9 DOA OE 05 c OR tdl 0% 06] I6.1 I5.1 ZI 5) wAE�R ouatm aoMo suMMAwr Wp WOU t NO VUUME REO'0 (¢-N) PROMPT III POND IXYEPi NO MATTER SURFACE PONO 0.C6 0RN I A956.11 195B.55 1 691 '0 0 Z ofg wa of ZO QJ 0 L Z� C600 a issh"15