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Home My WebLink About20041764 Ver 4_More Info Received_20110217 (2)• • s ^ ~ ^ Kimley-Horn ~ and Associates, Inc. Memorandum To: Natalie Landry, Division of Water Quality From: Austin Watts, Kimley-Horn and Associates, Inc. Date: February 16, 2011 Subject: Responses to Request for More Information (DWQ #04-1764 and NOV 2010 - WQ 0012) Shiloh Crossing ~GC~C~QdC'D i FF~ 1 7 ?_011 oENrt - tivar~H oun~ n The following is provided in response to the Request for More Information dated December 28, 2011. Items (4) and (9) of the NOV Requested Response Items have not been satisfactorily addressed. The as-built plan sheets must be full-sized (and at a scale of 1" = 20' or larger) with 1' topographical lines, the stormwater drainage system, building footprints and road footprints, and all other relevant details for the DWQ's review. Please provide a completely filled out Level Spreader Supplemental Form with ALL required items. (For example, no dimensions for the Level Spreader #4 by-pass were provided.) This form is available at: http://portal.ncdenr.or /web/wq/ws/su/bmn-manual. In addition, complete documentation for the buffer authorization has not been provided. Please provide. - The as-built plan sheets have been changed to be full-sized and at a scale of 1 " = 20' or larger. We also gathered additional survey of the as-built conditions in order to provide additional detail regarding the current site conditions. - Level Spreader Supplemental Forms have been provided with all required items. Please note the level spreaders have been constructed. Additionally, they were designed using previous design guidance. Also, Operation and Maintenance Agreements will be provided for all four level spreaders and associated buffer strips. Theses will be signed by Wal-Mart who will be responsible for the maintenance of all four level spreaders and associated buffer strips. - As we discussed in the meeting on January 3, 2011, we are unable to provide the documentation for the impacts to the buffer below Level Spreader 4 because no such Authorization was ever granted by the Division. The clearing of the buffer, although inadvertent, was never approved. As such, we are proposing re-establishment of the buffer by planting 2-inch caliper trees as indicated in the November 15, 2010 submittal. - Additionally, during the meeting on January 3, 2011, you requested that the bypass from Level Spreader 4 and the outlet from Pond E/Sediment Basin 7 be piped beneath the riparian buffer/filter strip. The attached plans provide a design to pipe the bypass from Level Spreader 4; however, the means of piping or otherwise addressing the outlet from Pond E/Sediment Basin 7 is TEL 919-677-2000 FAX 919-677-2050 3001 Weston Parkway Cary, NC 27513 still being determined. Once decision has been made and a design developed, it will be submitted. However, it was determined that it would be preferable to submit the remainder of the information for your review and approval in order to reach our committed deadline and because it is important to begin re-construction of Wetland A as soon as practicable. 2. Item (5) of the NOV Requested Response Items have not been satisfactorily addressed. The as-built plan sheets must be full-sized (and at a scale of 1" = 20' or larger) with 1' topographical lines, the stormwater drainage system, building footprints and road footprints, footprints of the diffuse flow devices and all other relevant details for the DWQ's review. Please provide a completely filled out Level Spreader Supplemental Form with ALL required items. This form is available at: http://portal.ncdenr.or web/wq/ws/su/bmp-manual. Please be sure to include details, when needed, for figures. - The as-built plan sheets have been changed to be full-sized and at a scale of 1 " = 20' or larger. We also gathered additional survey of the as-built conditions in order to provide additional detail regarding the current site conditions. - Level Spreader Supplemental Forms have been provided with all required items. Please note the level spreaders have been constructed. Additionally, they were designed using previous design guidance. Also, Operation and Maintenance Agreements will be provided for all four level spreaders and associated buffer strips. Theses will be signed by Wal-Mart who will be responsible for the maintenance of all four level spreaders and associated buffer strips. 3. Item (6) of the NOV Requested Response Items have not been satisfactorily addressed. The as-built plan sheets must be full-sized (and at a scale of 1" = 20' or larger) with 1' topographical lines, the stormwater drainage system, building footprints and road footprints, and all other relevant details for the DWQ's review. Please provide a completely filled out Stormwater Wetland Supplemental Form with ALL required items. (the form that was provided is incomplete and does not include the Required Items Checklist) This form is available at: http://portal.ncdenr.org/web/wq/ws/su/bmp-manual. The DWQ assumes that you are extending the outlet pipe of Wetland A as shown on the plan. Please verify. Confirm that the drain valve in the riser structure of Wetland A will be operational as designed and provide a timeframe. - The original construction drawings have been provided since it has been agreed that Wetland A shall be re-constructed per the original (approved) plan set and planting plan. These plans are full sized, but the scale is 1 "=40'. It is assumed that the original plans are sufficient in this instance. - Stormwater Wetland Supplemental Forms have been provided with all required items. Please note that the original design was a hybrid of the current Division design standards that existed at the time and the City of Durham (and draft Division) guidance that was available at the time. As such, some of the design parameters do not meet current design guidance. - During reconstruction the drain valve will be made operational which is scheduled to be completed by the end of April. 4. Item (3) of the NOV Requested Response Items have not been satisfactorily addressed. The proposal states "that a notch be provided in the bed rock in order to lower the stream invert..." Please demonstrate and provide a scaled profile of the stream (at Crossing #1) and show how water will flow through the culvert during the 10 and 25 year storm events based on full build-out conditions (completion of Phases 2 and 3). Provide headwater and tailwater conditions for these storms as well. - A scaled profile of the stream at Crossing #1 has been provided, which includes a comparison of water surface elevations with and without the notch for the 10 and 25 year storm events, assuming built-out conditions. We have also provided the modeling results in the Appendix for your review. 5. Please describe how the notch will be installed in the bed rock. The proposal states, "The current accumulation of sediment within the culvert will be removed and properly disposed of prior to notching the bedrock and only natural sediment bed loads will subsequently pass through." Please add that the "current accumulation of sediment and debris on the upstream end of the culvert will be removed and properly disposed of prior to notching the bedrock." To the monitoring, add "depth and extent of sediment deposition, if any." - The plan to excavate the notch is as follows: 1) The current accumulation of sediment and debris on the upstream end, within, and immediately below the culvert will be removed and properly disposed of prior to notching the bedrock. 2) A special stilling basin (commonly known as a dirt bag) will be provided with an impervious dike to trap the water to be pumped to the special stilling basin. The dike will be established immediately below the end of the bedrock outcrop. 3) A track hoe will be used to excavate or hammer a notch as shown in the attached plan sheets. All work will be performed from the north side of the stream to minimize damage to the buffer. 4) The debris will be mechanically removed by the track hoe or removed by hand and properly disposed. 5) Once the notch has been satisfactorily constructed, any impacted stream banks will be re-established to preconstruction conditions and the construction access points will be ripped or disked and planted with appropriate permanent vegetation considering the power line easement. 6) Monitoring of the site will be for three years. Monitoring will occur once per quarter for the first year and yearly for the next two years. The monitoring will include taking photos from the same vantage points, upstream, downstream, and at the culvert. Additionally, a brief memo to will be submitted to the Division once per monitoring occurrence, documenting the results. APPENDIX 1 SUPPLEMENTAL FORMS • • ~wn_ NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM WETLAND SUPPLEMENT O~OF W A TLc94G > ~ o This form must be filled out, printed and submitted. The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all the required information. I. PROJ~CIINFORMATION Project name Shiloh Crossing Wetland A Contact name Todd St. John Phone number (919) 677-2000 Date February 11, 2011 Drainage area number Onsite A II. D~SIt3N,INF4RMAT10N Site Characteristics Drainage area 1,844,766.00 ftz Impervious area 1,588,633.20 ftz Percent impervious 86.1% Design rainfall depth 1.00 inch Peak Flow Calculations 1-yr, 24-hr rainfall depth in 1-yr, 24-hr intensity 4.75 in/hr Pre-development 1-yr, 24-hr runoff 46.95 ft3/sec Post-development 1-yr, 24-hr runoff 42.37 ft3lsec Pre/Post 1-yr, 24-hr peak control -4.57 ft3lsec Storage Volume: Non-SA Waters Minimum required volume 126,834.00 ft3 Volume provided (temporary pool volume) 127,800.0 0 ft3 OK Storage Volume: SA Waters Parameters 1.5" runoff volume ft3 Pre-development 1-yr, 24-hr runoffvolume ft3 Post-development 1-yr, 24-hr runoffvolume ft3 Minimum volume required ft3 Volume provided ft3 Outlet Design Depth of temporary pool/ponding depth (DP,a~,s) 20.16 in Insufficient depth of temp. pool. Drawdown time 2.80 days OK Diameter of orifice 4.00 in #VALUE! Coefficient of discharge (Co) used in orifice diameter 0.60 (unitless) calculation Driving head (H°) used in the orifice diameter calculation Variable ft OK Form SW401-Wetland-Rev.6-11/16/09 Parts I and II. Project Design Summary, Page 1 of 4 Surface Areas of Wetland Zones Surface Area of Entire Wetland Shallow Land The shallow land percentage is: Shallow Water The shallow water percentage is: Deep Pool Forebay portion of deep pool (pretreatment) The forebay surface area percentage is: Non-forebay portion of deep pool The non-forebay deep pool surface area percentage is: Total of wetland zone areas Add or subtract the following area from the zones Topographic Zone Elevations Temporary Pool Elevation (TPE) Shallow Land (top) Permanent Pool Elevation (PPE) Shallow WatedDeep Pool (top) Shallow Water bottom Most shallow point of deep pool's bottom Deepest point of deep pool's bottom Design must meet one of the following two options: This design meets Option #1, Top of PPE is within 6" of SHWT, If yes: SHWT (Seasonally High Water Table) This design meets Option #2, Wetland has linerwith permeability <0.01 inlhr, If yes: Depth of topsoil above impermeable liner Topographic Zone Depths Temporary Pool Shallow Land Permanent Pool Shallow Water Deep Pool (shallowest) Deep Pool (deepest) Planting Plan Are cattails included in the planting plan? Number of Plants recommended in Shallow Water Area: Herbaceous (4+cubic-inch container) Number of Plants recommended in Shallow Land Area: Herbaceous (4+cubic-inch container), OR Shrubs (1 gallon or larger), OR Trees (3 gallon or larger) and Herbaceous (4+cubic-inch) Number of Plants provided in Shallow Water Area: Herbaceous (4+cubic-inch container) Number of Plants provided in Shallow Land Area: Herbaceous (4' cubic-inch container) Shrubs (1 gallon or larger) Trees (3 gallon or larger) and Grass-like Herbaceous (4+cubic-inch) Form SW401-Wetland-Rev.6-11/16/09 77,987.00 ft2 OK 16,992.00 ftZ Insufficient shallow land area. 22% 24,270.00 ft2 Insufficient shallow water area. 31% 24,567.00 ftz Insufficient forebay area. 32% 12,158.00 ftZ Insufficient non-forebay deep pool area. 16% 77,987.00 ft2 OK 0.00 ft2 355.68 ft amsl 354.00 ft amsl 353.50 ft amsl 353.50 ft amsl 351.00 ft amsl N (Y or N) ft amsl OK Y (Y or N) 4.00 in OK 20.16 in Insufficient shallow land depth. 6.00 in OK 6.00 in Insufficient deep pool depth. 36.00 in OK N (Y or N) OK 6,100 4,250 680 85 and 3,400 6,000 Higher density is required. 5,000 OK 700 OK 0 More required if not planting herb. and/or shrubs. Parts I and II. Project Design Summary, Page 2 of 4 Additions I Information Can the design volume be contained? Y (Y or N) OK Does project drain to SA waters? If yes, N (Y or N) Excess volume must pass through filter. What is the length of the vegetated filter? ft Are calculations for supporting the design volume provided in the Y (Y or N) OK application? Is BMP sized to handle all runoff from ultimate build-out? Y (Y or N) OK Is the BMP located in a recorded drainage easement with a Y (Y or N) OK recorded access easement to a public Right of Way (ROW)? The length to width ratio is: 0.82 :1 Insufficient length to width ratio. Approximate wetland length 290.00 ft Approximate wetland width 355.00 ft Approximate surface area using length and width provided 102 z ,950.00 ft This approx. surface area is within this number of square feet of the entire wetland surface area reported above: Will the wetland be stabilized within 14 days of construction? Y (Y or N) OK Form SW401-Wetland-Rev.6-11/16/09 Parts I and II. Project Design Summary, Page 3 of 4 Permit No. (to be provided by DWQ) III. REQUIRED ITEMS CHECKLIST Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Initials Pagel Plan Sheet No. C11-06 1. Plans (1" - 50' or larger) of the entire site showing: DRAINAGE -Design at ultimate build-out, EXHIBITS -Off-site drainage (if applicable), -Delineated drainage basins (include Rational C coefficient per basin), -Wetland dimensions (and length to width ratio), -Pretreatment system, - Maintenance access, -Proposed drainage easement and public right of way (ROW), -Overflow device, and -Boundaries of drainage easement. C11-06 2. Plan details (1" = 50' or larger) for the wetland showing: DRAINAGE -Wetland dimensions (and length to width ratio) -Pretreatment system, EXHIBITS -Maintenance access, -Proposed drainage easement and public right of way (ROW), - Design at ultimate build-out, -Off-site drainage (if applicable), -Overflow device, and -Boundaries of drainage easement. C11-07 3. Section view of the wetland (1" = 20' or larger) showing: -Side slopes, 3:1 or lower -Wetland layers All wetlands: Shallow land depth, shallow water depth, deep pool depth Option 1, no clay liner: SLWT depth Option 2, clay liner: Depth of topsoil on top of liner, liner specifications L-4.1 4. A detailed planting plan (1" = 20' or larger) prepared by a qualified individual showing: - A variety of several suitable species (not including cattails), -Sizes, spacing and locations of plantings, -Total quantity of each type of plant specified, - A planting detail, -The source nursery for the plants, and -Fertilizer and watering requirements to establish vegetation. NIA 5. A construction sequence that shows how the wetland will be protected from sediment until the entire drainage area is stabilized. APP. 3 6. The supporting calculations (including drawdown calculations). APP.1 7. A copy of the signed and notarized operation and maintenance (0&M) agreement. N/A 8. A copy of the deed restrictions (if required). NIA 9. A soils report that is based upon an actual field investigation and soil borings. County soil maps are not an acceptable source of soils information. SW401-Wetland-Rev.6-11/16/09 Part III, page 4 of 4 -~ A /// r1 ,aaF W~ipA O ~G ~~ ~ NCDE N R ° STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM LEVEL SPREADER -VEGETATED FILTER STRIP (LS-VFS) SUPPLEMENT This form must be completely filled out, printed, initialed, and submitted. I. PROJECT INFORMATION Project name Shiloh Crossing • Level Spreader 1 Contact name Todd St. Jahn Phone number (919) 677-2000 Date February 11, 2011 Drainage area number II. DESKiN INFORMATION The purpose of Ne LS-VFS Pdlulant removal: 40% TSS, 30% TN, 35% TP Slormwater enters LS-VFS from The drainage area Type of VFS Engineered filer strip (graded R sodded, slope < 8 % ) Explanation of any "Other" responses above If Slormwater Enters the LS-VFS from the Drainage Area Drainage area 226,076 flz Impervious surface area 124,582 ftz Percent impervious 55.11 RaOonal C coefficient 0.61 Peak flow from the 1 in/hr storm 3.17 cfs Time ofconcenttafion 5.00 min Rainfall intensity, l0-yr storm 6.86 inlhr Peak flow from thel0•yrstorm 21.12 cfs Design storm 1 inch/hour storm Maximum amount of flow directed N the LS•VFS 3.28 cfs Is a flow bypass system going to be used? Y (Y or N) Explanation of any "Other" responses above If Slormwater Enters the LS-VFS from a BMP Do not complete this section of the form. Type of 6MP Pick one: Peak discharge from the 8MP during the design storm cfs Peak discharge from the BMP during the 10-year storm cfs Do not complete this section of the form. Maximumcapacityofa100-foolbngLS-VFS 10 cfs Peak flow directed to the LS•VFS cfs Do not complete Nis sec~on of the form. Is a fbw bypass system going to be used? (Y or N) Explanation of any "Other" responses above LS-VFS Design Forebay Surface area 274 sq fl Forebay is adequately sized. DepNofforebayatslormwaterentrypoint 36 in DepNisappropriate. Depth of forebay at stormwaler exit point 6 in DepN is appropriate. Feet of level lip needed per ds 10 tUc(s Computed minimum length of the level lip needed 33 fl Length of level lip provided 43 fl WidN of VFS 107 fl Elevation at downslope base of level lip 349.00 fmsl Elevation al the end of Ne VFS that is fanhest from the LS 346.00 fmsl Slope (from level lip b the end of the VFS) 2.80 Are any draws present in the VFS? N (Y or N) OK Is there a cdlector swats at the end of the VFS? N (Y or N) Bypass System Design (if applicable) Is a bypass system provided? Is Nere an engineered fbw splitting device? Dimensions of the channel (see diagram below): M B W y (flow depth for 10-year storm) freeboard (during Ne 10-year storm) Peak velocity in the channel during the 10-yr storm Channel lining maledal Does the bypass discharge through a wetland? Does the channel enter Ne stream at an angle? Explanation of any "Other" responses above Form SW401 - LS-VFS - 29NOV2010 - Rev.B Y (Y or N) Y (Y or N) Please provide plan details of Aow splilter 8 suppoding talcs. 2.00 fl 4.50 tt 9.80 fl 1.04 fl 0.29 fl Provide al least one fool of freeboard. 1.74 fUsec Pidc one: N (Y or N) Y (Y or N1 page 1 of 2 • • NL RE4UIRED ITEMS CHECIaIST EDIT Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Requrlad Item: 1. Plans (1" - 50' or larger) of the entire site showing: - Design at ultimate build-0ut, -Off-site drainage ('rf applicable), -Delineated drainage basins (include Rational C coeffcient per basin), -Forebay (if applicable), -High flow bypass system, -Maintenance access, -Proposed drainage easement and public right of way (ROW), and - Boundaries of drainage easement. 2. Plan details (1" = 30' or larger) for the level spreader showing: • Forebay (itapplicable), -High flow bypass system, -One foot topo lines between the level lip and top of stream bank, -Proposed drainage easement, and - Design at ultmate build-0ut. 3. Section view of the level spreader (1" = 20' or larger) showing: - Underdrain system (i(applicable), -Level lip, - Upslope channel, and - Downslope filler fabric. 4. Plan details of the flow splitting device and supporting calculations (if applicable). 5. A construction sequence that shows how the level spreader will be protected from sediment until Ne entire drainage area is stabilized. 6. If anon-engineered VFS is being used, then provide a photograph of the VFS showing that no draws are present. 1. The supporting calculatons. 8. A copy of the signed and noladzed operation and maintenance (OSM) agreement. Initials Page or plan sheet number and any notes: C-11.01 SM-01 POST-DEVELOPMENT DRAINAGE AREA EXHIBIT, 2-YR AND 10-YR STORM PRE AND POST-DEVELOPMENT DRAINAGE AREA PROPERTIES C-11.01 SM-01 C11-07 Appendix 3 NIA Appendix 1 Appendix 3 Appendix 1 Form SW401 - LS-VFS - 29Nov2070 - Rev.B page 2 of 2 • O ~~ c NCDENR P STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM LEVEL SPREADER -VEGETATED FILTER STRIP (LS-VFS) SUPPLEMENT This form must be completety filled out, printed, initialed, and submitted. I. PROJECT INFORMATION Project name Shibh Crossing -Level Spreader 2 Contact name Todd St. John Phone number (919) 677-2000 Date February 11, 2011 Drainage area number IL DE81GN INFORMATION The purpose of the LS-VFS Pollutant removal: 40% TSS, 30% TN, 35% TP Stormwater enters LS-VFS from The drainage area Type of VFS Protected dpadan buffer (slope < 5 % ) Explanation of any "Other responses above H Stormwater Enters the LS•VFS from the Drainage Area Dminagearea 62,726 ft1 Impervious sudaoe area 50,094 fl Percent impervias 79.86 Rational C coefficient O.gp Peak flow fran the t irVhr storm 1.15 ds Time of concentration 5.00 min Rainfall intensity, l0-yr storm 7.12 inlhr Peak flow from the 10-yr storm 8.20 cfs Design storm 1 inchlhour slam Maximum amount of flow directed to the LS-VFS 1.19 cfs Is a flow bypass system going to be used? Y (Y a N) Explanation of any'Olher' responses above H Stormwater Enters the LS-VFS from a BMP Do not complete this section of the form. Type of BMP Peak discharge fran the BMP during the desgn storm cfs Peak discharge from the BMP during the 10-year slam cts Do not complete this section of the form. Maximum capacity of a 100-foot long LS-VFS 2 cfs Peak flow directed lothe LS-VFS cfs Do not complete this section of Ne form. Is a flow bypass system going to be used? (Y a N) Explanation of any "Other' responses above LS-VFS Design Forebay surface area 190 sq R Forebay is adequately sized. Depth of faebay at stormwaterentry point 36 in Depth is appropriate. Deptl1 of faebay at Stormwater exit point 6 in Depth is appropriate. Feet of level lip needed per cfs 50 Nck Computed minimum length of the level lip needed 60 ft Length of level lip provided 77 ft Width of VFS 77 ft Elevation at downsbpe base of level lip 339.00 fmsl Elevation at the end of the VFS that is farthest from the LS 334,00 tmsl Slope (from level lip to the end of the VFS) 6.49 Are any draws present in fire VFS? N (Y or N) OK Is these a collector Swale at the end of the VFS? N (Y or N) Bypass System Design ('d applicable) Is a bypass system provided? Y (Y or N) Is there an engineered Aow splitting device? Y (Y a N) Please provide plan details of Aow splitter 8 supporting talcs. Dimensions of the channel (see diagram below): M N/A % B N/A fl W NIA ft y (flow depth for 10-year storm) N/A fl freeboard (dudng the 10-year storm) N/A fl Peak velocity in the channel during the 10-yr storm NIA ft/sec Channel lining material Pick one: Does the bypass discharge Through a wetland? N (Y a N) Does tl1e channel enter the stream at an angle? Y (Y a N) Ezplanaton of any'Othef responses above Form SW401 - LS-VFS - 29Nov2010 - Rev.a page 1 012 III. RE IREDffEMSCHECKLIST EDIT Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Requried Item: 1. Plans (1"- 50' or larger) of the entire site showing: - Design at ulAmale buildouL - OH-site drainage (if appliable), -Delineated drainage basins (include Rational C coefficient per basin), - Forebay (if applicable), -High flow bypass system, -Maintenance access, -Proposed drainage easement and public right of way (ROW), and - Boundades of drainage easement. 2. Plan details (1"= 30' or larger) for the level spreader showing: - Forebay (if applicable), -High Aow bypass system, -One foot topo lines between Ne level lip and top of stream bank, -Proposed drainage easement, and -Design at ulAmate build-0ut. 3. Section view of the level spreader (1" = 20' or larger) showing: - Underdrain system (if applicable), -Level lip, - Upslope channel, and - Downslope filter fabric. 4. Plan details of the Aow splitting device and supponing calculations (rf applicable). 5. A cons Wctbn sequence that shows how the level spreader will be protected from sediment until Are entire drainage area is stabilized. 6. If anon-engineered VFS is being used, then provide a photograph of the VFS showing that no draws are present. 7. The supporting calculations. 8. A copy of Ne signed and notarized operetion and maintenance (0&M) agreement. Initials Paae or olan sheet number and anv notes: C-11.02 SM-02 POST-DEVELOPMENT DRAINAGE AREA EXHIBIT, 2-YRAND 10-YR STORM PRE AND POST-DEVELOPMENT DRAINAGE AREA PROPERTIES C-11.02 SM-02 C11-07 Appendix 3 NIA Appendix 1 Appendix 3 _. Appendix 1 Form SW401 - LS-VFS - 29Nov2010 - Rev.B page 2 of 2 • w w A of w~TFH ~ ~` NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM LEVEL SPREADER -VEGETATED FILTER STRIP (LS-VFS) SUPPLEMENT This form must be completety (fled out printed, initialed, and submitted. 1, -PROJECT INFORMATION Project name Shiloh Crossing -Level Spreader 3 Contact name Todd SL,bhn Phone number (919) 677.2000 Date February 11, 2011 Drainage area number II. DESNiN INFORMATWN The purpose of the LS-VFS Pdlulantremova1:40% TSS,30% TN, 35% TP Stormwater enters LS-VFS from The drainage area Type of VFS Herbaceous Stormwater setback W of I-95 (slope < 8 % ) Explanation of any "Other" responses above If Stormwater Enters the LS•VFS from the Drainage Area Drainage area 71,874 ft' Impervious surface area 56,628 flz Percent impervious 78.79 % Rational C weffcienl 0.79 Peak flow from the 1 irdhr storm 1.30 cis Time of concentration 5.00 min Rainfall intensity, l0-yr storm 6.89 inlhr Peak flow from the 10•yr storm 8.98 cis Design storm 1 inch/hour storm Maximum amount of flaw directed b the LS•VFS 1.33 cis Is a fbw bypass system going to be used? Y (Y or N) Explanation of any "Other" responses above N/A If Stormwater Enters the LS•VFS from a BMP Do not complete this section of the form. Type of BMP Peak discharge from the BMP during the design storm cfs Peak discharge from the BMP during the 10-year storm cfs Do not complete this section of the form. Maximum ppacity of a 100•foot long LS-VFS 5 cfs Peak flow directed to the LS-VFS cfs Do not complete this section of the form. Is a flow bypass system going to be used? (Y or N) Explanation of any "Other' responses above LS-VFS Deslgn Forebay surface area 162 sq ft Forebay is adequately sized. Depth of forebay at Stormwater entry point 36 in Depth is appropriate. Depihofforebayalstormwalerexitpoinl 6 in Depthisappropriate. Feet of level lip neededperds 20 ftlcfs Computed minimum length of the level lip needed 27 ft Length of level lip provided 59 h Width of VFS 60 ft Elevation aldownslope base of level lip 332.00 fmsl Elevation at the end of the VFS that is farthest from the LS 329.00 fmsl Slope (from level lip to the end of the VFS) 5.00 % Are any draws present in the VFS? N (Y or N) OK Is there a collector Swale at the end of the VFS? Y (Y or N) Bypass System Deslgn (if applicable) Is a bypass system provided? Is there an engineered flow splitting device? Dimensions of the channel (see diagram below): M B W y (flow depth for 10-year storm) freeboard (during the 10-year storm) Peak velocity in the channel during the 10-yr storm Channel lining material Dces the bypass discharge through a wetland? Dces the channel enter fhe stream at an angle? Explanation otany "Other" responses above Form SW401 - LS-VFS - 29NOV2010 - Rev.B Y (Y or N) Y (Y or N) Please provide plan details offlow sputter & supporting talcs. 2.00 ft 4.00 h 10.00 ft 1.19 h 0.31 ft Provide at least one foot of freeboard. 0.98 ft/sec Pick one: N (Y or N) Y (Y orNl page 1 of 2 IIL REQUIREb ITEMS CHECKLIST EDIT Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met, If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach Justification. Requrled Item: 1. Plans (1" - 50' or larger) of the entire site showing: - Design at ultimate build-0ut, -Off-site drainage (if applicable), -Delineated drainage basins (indude Rational C coefficient per basin), • Forebay (if applicable), -High flow bypass system, -Maintenance access, • Proposed drainage easement and public dght of way (ROW), and • Boundaries of drainage easement. 2. Plan details (1' = 30' or larger) for the level spreader showing: -Forebay (if applicable), - High flow bypass system, - One faottopo lines between the level lip and tap of stream bank, -Proposed drainage easement, and - Design at ultimate build-0ut. 3. Section view of the level spreader (1" = 20' or larger) showing: • Underdrain system (fi applicable), -Level lip, - Upslope channel, and - Downslope filter fabric. 4. Plan details of the flow splitting device and supporting calculations (if applicable). 5. A construction sequence that shows how the level spreader will be proteded from sediment until the entire drainage area is stabilized. 6. If a non~ngineered VFS is being used, then provide a photograph otthe VFS showing that no draws are present. 7. The supporting calculatons. 8. A copy of the signed and notarized operation and maintenance (0&M) agreement. Initials Paue or plan sheet number and any notes: C-11.03 SM-02 POST-DEVELOPMENT DRAINAGE AREA EXHIBIT, 2-YR AND 10-YR STORM PRE AND POST-DEVELOPMENT DRAINAGE AREA PROPERTIES C-11.03 SM-02 C71-07 Appendix 3 NIA Appendix i Appendix 3 Appendix 1 Form SW401 - LS-VFS - 29Nov2070 - Rev.a page 2 of 2 NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM LEVEL SPREADER -VEGETATED FILTER STRIP (LS-VFS) SUPPLEMENT This Corm must be completety filled out, printed, initialed, and submitted. ~F WATFH o ~~O` I. PROJECT INFORMATION Project name Shiloh Crossing -Level Spreader 4 Contact name Todd SL John, PE LEED Phone number (919) 677-2000 Date February 11, 2011 Drainage area number S. DESN3N INFORMATION The purpose of the LSVFS Pdlulant remova1:40 % TSS, 30% TN, 35 % TP Stormwater enters LS-VFS from The drainage area Type of VFS Protected riparian buBer (slope < 5 % ) Explanation of any "Other" responses above If Stormwater Enters the LSVFS from the Drainage Area Drainage area 44,431 (!z Impervious surface area 23,522 flz Percent impervious 52.94 Rational C coeffcient 0.60 Peak flow from the 1 inlhr storm 0.61 cfs Time ofconcenbaGon 5.00 min Rainfall inlensity,l0•yr storm 7.05 inmr Peak flaw from the 10-yr storm 4.31 cfs Design storm 1 inch/hour stone Maximum amount of flaw directed b the LSVFS 0.64 cfs Is a flow bypass system going to be used? Y (Y or Explanation of any'Other" responses above If Stormwater Enters the LSVFS from a 8MP Do not complete Nis section of the form. Type of BMP Pick one: Peak discharge from the BMP during the design storm cfs Peak discharge from the BMP dudng the 10-year storm cfs Do not complete this section of the form. Maximum capacity of a 100-foot long LSVFS 2 cfs Peak flow directed to the LSVFS cfs Do not complete this section of the form. Is a fbw bypass system going to be used? (Y or N) Explanation of any "Other" responses above LSVFS Design Forebay surface area 190 sq ft Forebay is adequately sized. Oepthofforebayatstormwaterentrypcint 24 in Deplhisappropriate. Depth of forebay at stormwater exit point 6 in Depth is appropriate. Feet of level lip needed per ds 50 fUcfs Computed minimum length of the level lip needed 32 fl Length of level lip provided 42 ft Width of VFS 7q ry Elevation atdownslope base of level lip 319.00 fmsl Elevation at the end of the VFS that is farthest from the LS 316.00 fmsl Slope (from level lip to the end oithe VFS) 4.05 Are any draws present in the VFS? N (Y or N) OK Is there a collector Swale at the end of the VFS? _ N (Y or N) Bypass System Design (if applicable) Is a bypass system provided? Y (Y or N) Is there an engineered flow splitting device? Y (Y or N) Please provide plan details offlow splitter 8 supporting talcs. Dimensions of the channel (see diagram below): M 2.00 ft B 2.00 ft W 5.00 fl y (flow depth for 10-year storm) 0.55 ft freeboard (during the 10-year storm) 0.20 fl provide at least one foot o(freeboard. Peak velocity in the channel during the 10-yr storm 1.39 fl/sec Channel lining matedal Pick one: Does the bypass discharge through a we0and? N (Y or N) Does the channel enter the sbeam at an angle? Y (Y or N) Explanation of any "Other" responses above Form SW401 - LS-VFS - 29NOV2070 - Rev.B page 1 of 2 Ill. REgUltt CiPI'EM9CHECNLIST EDIT Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This wilt delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Requried Item: 1. Plans (1"- 50' or larger) of fhe entire site showing: - Design al ultimate buildout, - Off-site drainage (flapplicable), - Delineated driinage basins (include Rational C coeffcienl per basin), -Forebay (ii applicable), -High flow bypass system, -Maintenance access, -Proposed drainage easement and public right of way (ROW), and - Boundaries of drainage easement. 2. Plan details (1" = 30' or larger) for the level spreader showing: -Forebay (if applicable), -High flow bypass system, - One foottopo lines between the level lip and top of stream bank, -Proposed drainage easement, and - Design at ultimate build-0ul. 3. Section view of the level spreader (1" = 20' or larger) showing: - Underdrain system (fl applicable), -Level lip, - Upslope channel, and - Downslope filter fabric. 4. Plan details of the flow splifling device and supporting calculations (itappliceble). 5. A construction sequence that shows haw the level spreader will be protected from sediment until the entire drainage area is stabilized. 6. If a non2ngineered VFS is being used, then provide a photograph of the VFS showing that rro draws are present. 7. The supporting calculations. 8. A copy of the signed and notarized operation and maintenance (OSM) agreement. Initials Page or plan sheet number and any notes: C-11.04 i SM-03 POST-0EVELOPMENTDRAINAGE AREAtJ(HIBIT,2-YR I AND 10-YR STORM PRE AND POST-DEVELOPMENT DRAINAGEARF~, '~ PROPERTIES C-11.04 SM-03 I i i C11-07 Appendix 3 N/A Appendix 1 Appendix 3 Appendix 1 Forrn SW 401 - LS-VFS - 29Nov2010 - Rev.B page 2 of 2 ~ ~ , 1 ~~~e" ~K ' 1 +'+71 i rv Y ~l~ ^k~ ~~ "z F! 1 ~ ~ F k •~ ~ ~r ~ < .. r yF.s~ ~ ~~ ~ ~~1 r ti ~ y ,~ , t~` ~ ~ h ~ ~ ~ ~~ r ,~ t ~ n .k ~~ °,"~~ ik'r .-r Jl r~ ~~~ ~ . ,^i~ r ~ -~~'`~i~~4'P~x . ~ ,~ Y ~ ~ s q •^} y t , ry~ ' " ..'L ~ . i ~ ,.. r ;~"~4 }~~r ~~ r i r~ ai • ,, r k+- .. ~ Y ~ s Y A ~ ~ , « i ~~ r r ~ ny~a .„,- r 6 , .:' ~ " ~ ~ ~ ~ ~ f~ .~' s .y ~ r •"~ yA r w ,Y,,(?¢~~ ' ' i~R y ,J3 e~; ~•b"P~ rn ~ { r ~•, W ..Sr` " ~ a '~ k ~~~~Y~y,+pkR ji+v ;e~ j,ig~y~i~,+~`t"!'s '~ s~ ~ 2k ,~Pkr~BNtp ~4f~ ',t ~w,.~. R (+ 7 G i ~ ~ ~~ ~ 1 a ~. ~ ~ '~ ~r r k t ,4 it ~ii~~{Y. '~v ~'• s s~ ~~" Y Y I s~ ~` ~~ 'f ~ - ~~Y~ r 4 '~ '~ p ~'~~ ' s _ rg r ,M~ 7 ~ ~ 7~' N ~ ~ ~ ~ ~ r'' y '7'( jFa{ ~ ~ Y.. ! r~~~~ GAfB~; j~~/pr ~k~,~/ i ~ r~~" ~ • I~ ~~-s~~4 ~ ' r ~ ~ r # ' -~ { 1 ~ ~jsh r Oy~~ ~' f. .;j i h:.. ppy~,l ~ ~ ~ 'I ~(.eF X # '~ ~ ~ i l~'~4 r Y >~~ 44 •vGi ~~ 3 l ~~{ s~ ~' ® ~ ' 7c F ~ ~ p ~ ' 1( 4 / jl k- 4 ~ i •1 ! ~,l,t ' 3 `t ;. ~ 6 ~ Y~ fir' a'i~~)1 p// ~m '~~~f A~'~ 'iii. 'Jr`fi,~. y Level Spreader 1 ~' ~y .. h'~' ~ i ~ ..;. s.: ~~{ ~ ; ~ "F w ~A i r~ t t •~~• a M~ R e ! S~ r ~ r a<`~ . ayry~ ~r~X l~ ~- ~~ w ;v }apt ~ _ ~tl r., x ' a . y: .y ~~ ~. ?~` •sf` `~ ~7~, 'yeti i.: ~r ~b cat ~ ~"~ ro '`}F!. r '£, 3 `'} ma ' ~' ~ ~n \ ,~ y ~d y, `~ 1 ~ , :. yC, S ~ ~= 3r i Ew~. `'~ i ~-' Y a r~ y t ^ '~V t . ~*~,~} - ~ ~ ~ /~J Shy ~ ~ fSY. .~! r Ir~.F4 ' ~ T ^~'r_ ~ + # ~ a ~ ..x .a.~ rrr : ,J -~ Q ~ j ^5` ~ ~ `, ~11~ 4 x ~.. RRRlll 333 ~~., _ i AI~A~ ~ ~ ~ +~t ~~K `.~. 1`r ..ice f «. .o-4• .tq ~~ ~~ yh,. f k , »3 Level Spreader 2 Title Level Spreader photos Project Shiloh Crossing Shopping Center Prepared Far: Wake and Durham Counties, North Carolina WAL-MART Date Project Number Figure 2/14/11 015476039 1 -3.r _ .._ ,~~ , .. _,~.. f .. _ ... ._ :: Level Spreader 3 ~~ f ~ -~ 9 ~ ~~ ~~~ ;~ ~ ~. ~~~: ~~~ s ~. ~ { t ~. ~ q~ ~ ~ ~ ':~.~:m. ~ ~w,t .yc ;Yf'. ~ G~T iiK~Pl•:.~ ~t,M~f ia~ ~., Level Spreader 4 Title Level Spreader photos Project Shiloh Crossing Shopping Center P~eParearo~: Wake and Durham Counties, North Carolina WAL-MART Date Project Number Figure 2/14/11 015476039 2 C~I1 ~ ..~R • • i r • • r TROUTMAN SANDERS LLP A T T O R H 6 Y S /1 T L A W ~ LI YITIN Uw/IL1T7 MpiMLA /NI- a94 FAYETYEVII,LE STREET TWO NANNOVFR 9CUARE score »oo RALEIpN, NCRiM CAROLINA 21601 w~Ix, iroute/ need gyn. eon Tl;L EPNON EI 018-9i 2-4! 08 PAC 81IA I LE 1919-Z t 2-4101 MAILING ADDRESS P. 0. DRAWER 1b89 RALt;ION, NORTH CAROLINA 47iQ9 Donald 7.OTIwIs don9W.alode®kaulltal~nders.oaRt VTA ELEGTRQ~TIC DELNERY James A. Cole, F.aqui~e Wa1~Mart Stores East, LP 20015E 10th Street Bentonville, AR 7271G-0550 ductDhk 01p,21Z4121 ~in/cl imp 91929-H717 Febxuary S, 2007 >i,etber of Recommendation Re: Wetlaad A--Operation and 1Viain~taace Agr+eeva~nt MorrisvIDa, NC -Stare # 450-00 1?ear Jim: With reference to the above pmoperiy! this letter is rounded to serve as oonfirmarion by Troutman Sanders LLP reganiing the aoceptabdity of exec~ptg the above refereaced agreement: 1. Oteration and Mainteaanae AQreeme~ {the "Agceematt"}: Prorrided tho outside cngitteelrs {Kimley Harnj and ~~ ll+lart Stags East, Ll' {~`WaI-Mart" are camfattabie with the maintenance items eddreta3ed is the Agr~ment, than the ~ aPP~s ~ ~ saceptab1e. It is our tmderstanding from speaking with ICimley Horn that the Agrement must be executed by J. Chris Callaway as part of the Division of Water Qaality's appmvai of the storm water detention pond. Please review the doeaments referenced above and call with any questions ar comments ynu may have. Sincerely, TRovTM~iN sArr0l~RS LLr ~~K~ Donald T. O'Toole ATLAN-FA - HONG KONQ • LONDON • NBWAIIK • NgW YQR1L • NORFOLK • RALB[pH RICHINOtYX1 • TYSQNS CQaNBQ • VIRGINIA BRACH • WASHIN(3TpN, ~,[,', WETLAND A -OPERATION AND MAINTENANCE AGREEMENT The we#land system is defined as the marsh areas and pretreatment including forebays and mirco~pool. Maintenance activities shall be performed as follows: 1. After every significant runoff producing rainfall event and at least monthly: a. Inspect the wetland system for sediment accumulation, erosion, trash accumulation, vegetated cover, and genera! condition. b. Check and clear the orifice of any obsVuctions such that drawdown of the temporary pool occurs within 2 to 5 days as designed. 2. Repair eroded areas immediately, re-seed as necessary to malntaln good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed. 3. Inspect and repair the discharge pipe from the basin annually to maintain proper functioning. 4. Remove accumulated sediment from the wetland system when the depth is reduced to 75% of the original design depth {see diagram below). Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality {i.e. stockpiling near a wetland or stream, etc. ~. The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. If the elevation of the marsh areas exceed the permanent pool elevation, the sediment should be removed to design levels. This shall be performed by removing the upper t3 inches of sail and stockpiling it. Then the marsh area shall be excavated six inches below design elevations. Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled for more than two weeks. When the permanent pool depth reads 351.75 feet in the forebay and micro-pool, the sediment shall be removed. Sediment Re~oval-Elev_351.75 Bottom FOREBAY WETLAND A DIAGRAM (fill in fhe blanks) Permanent Pool Fevation: I75% Sedimen# Removal Elev: 351.75 ~25% --------------- ~oftom~!'evation: -~ f- -__.._ MICRO POOL Page 1 of 2 5. Wetland planting densities in the marsh areas should be maintained by replanting bare areas as needed. Wetland plants should be encouraged to grow in the marsh areas. 6. If the wetland must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. 7. All components of the wetland system shall be maintained in good working order. $. Level spreaders or other structures that provide diffuse flow shall be inspected annually. All accumulated sediment and debris shall be removed from the structure, and a level elevation shall be maintained across the entire flaw spreading structure. Any down gradient erosion must be repaired and/or replanted as necessary. I acknowledge and agree by my signature below that I am responsible for the pertormance of the eight maintenance procedures listed above. t agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Print name: J Chris Cailawav Title: Assistant Vice President , w~-~-rear sus Cis ; e~ Address: 2001 SE 1 D~' Street Bentonville. AR 72718 qp r le °~ t s only Phone: (479) 273-40Q0 ~y WAL-M LEGAL DEPT. Signature: ~ G~ Deke:~~~ ~--~-- Date: 7 Note: The legally responsible party should not be a homeowners association unless more than 50% of lots have been sold and a resident of the subdivision has been named president. 1, ~ , a Notary Public far the State of ,County of , do hereby certify that ----~ - 4~J~~Q~i~vr personally appeared before me this ~, day of i~lc~ rl.:~,, , „ , ~, and acknowledge the dus execution of the forgoing wetland maintenance requirements. Witness my hand and official seal, fTARY PUBLfGSTATE OP ARKANSAS BENTON COUNTY My Commission Expires 1t}-19-2016 SEAL My commission expires (a ~ la Jute _ Page 2 of 2 • Permit Number: (to be provided by DWQ~ T)rainage Area Number: ~ Filter Strip,l2estored Riparian Buffer and Level Spreader - Operation and Maintenance Ag~reernent - I will keep a maintenance record on this BMP. This maintenance record will be kept in a - log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity - of structures, safety of the public, and the removal efficiency of the BMP. Important maintenance procedures: -~ Immediately after the filter strip is established, any newly planted vegetation - will be watered twice weekly if needed until the plants become established (commonly six weeks). -~ Once a year, the filter strip will be reseeded to maintain a dense growth of - vegetation ~ - Stable groundcover will be maintained in the drainage area to reduce the sediment load to the vegetation. - Two to three times a year, grass filter strips will be mowed and the clippings - harvested to promote the growth of thick vegetation with optimum pollutant removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and may be allowed to grow as tall as 12 inches depending on aesthetic requirements - (NIPC,1993). Forested filter strips do not require this type of maintenance. Once a year, the soil will be aerated if necessary. - Once a year, soil pH will be tested and lime will be added if necessary. - After the filter strip is established, it will be inspected quarterly and within 24 hours after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County). Records of operation and maintenance will be kept in a known set location and will be - available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potential roblem: How I will remediate the roblem: The entire #ilter strip Trash/debris is present. Remove the trash/debris. s stem The flow splitter device The flow splitter device is Unclog the conveyance and dispose (if applicable) clo ed. of an sediment off-site. The flow splitter device is Make any necessary repairs or dannaged. replace if damage is too large for re air. Form SWU401-Level Spreader, Filter Strip, Restored Riparian BptTer d&M-Rev.3 Page 1 of 3 BMP element: Potential roblem: How I will remediate the roblem: The Swale and the level The Swale is clogged with Remove the sediment and dispose lip sediment. of it off-site. The level lip is cracked, Repair or replace lip. settled, undercut, eroded or otherwise dams ed. There is erosion axound the Regrade the soil to create a berm end of the level spreader that that is higher than the level lip, and shows stormwater has then plant a ground cover and bypassed it. water until it is established. Provide lime and aone-time fertilizer a lication. Trees or shrubs have begun Remove them. to grow on the Swale or just downslo e of the Ievel li . The bypass channel Areas of bare soil and/or Regrade the soil if necessary to erosive gullies have formed. remove the gully, and then reestablish ro er erosion control. Turf reinforcementrs S#udy the site to see if a larger damaged oz ripap is rolling bypass channel is needed (enlarge if downhill. necessary). Aftez this, zeestablish the erosion control material. The filter strip Grass is too short or too long Maintain grass of a height of if a licable . a roximatel three to six inches. Areas of bate soil and/or Regrade the soil if necessary to erosive gullies have formed. remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one-time fertilizer a lication. Sediment is building up on Remove the sediment and the filter strip. restabili~e the soil with vegetation if necessary. Provide lithe and a one- time #ertilizez a lication. Plants axe desiccated. Prrovide additional irzigation and fertilizer as needed. Plants are dead, diseased or :Determine the source of the dying. .problem: soils, hydrology, disease, e#c. Remedy the problem and replace plants. Provide aone-#ime fertilizer a lication. Nuisance vegetation is Remove vegetation by hand if Choking out desirable species. possible. If pesticide is used, do not allow it to get into the receiving water. The receiving water Erosion or other signs of Contact the NC Division of Water damage have occurred at the Quality local Regional Office, oz the outlet. 401 Oversi ht Unit at 919-7331786. norm SWU401-Level Spreader, Filter Strip, Restored Riparian duffer O&M-Rev.3 Page 2 of 3 s • • Permit Number: (to be provided by DWQ) I acknowledge and agree by my signature below that 1 am responsible for the performance of the maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name:Shiloh Crossing Shoppin Center BMP drainage area number:Level Spreader 1.2, 3, and 4 Print name:Steven L. Mitchael Title:Design Director, Wal-Mart Stores East. LP Note: The legally responsible party should not be a homeowners association upless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. h .~1 Srx. `fl"1 (~,a.rf~ra. ; a Notary Public for the State of ~~}~j ~~ , County of ~ , do hez'eby certify that ~1-~iaex~ yYl ~+A h~_ personally appeared before me this IS" day of ~ ~ ~t I_, and acknowledge the due executiott of the forgoing filter stxip, riparian buffer, and/or level spreader maintenance requirements. Witness my hand and official seal, LISA M. GARCIA NOTAFIY PUBLIC-STATE OF ARKANSA WASHINGTON COUNTY My Commission Expires May 01, 2017 Commission # 12360574 ~~AL My commission expires~~ ~ ~ D ~ "7 Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-ltev.3 Page 3 of 3 E ,', i i ',t i i. i' s ,; a j ii 'i ,: a r ~. APPENDIX 2 ICPR MODELING RESULTS J ~d s I~ i! I r. 4 ~~ ~~ rt .T. U F O 2 H a c~z~° Haw v~aoa snow O ~l W U V ~ D W w .7 x O V] O I O 'd i7 E W ~ xoa°O~' Ana a~~ m U ~. ~ I~ h U N .~ _0 N N iii N O O N ~i a U ~, ... a~ 0 an .Y 0 R,' b 0 A. b U :3 U N O a~~ a I 0 U an a k 3 UI 01 M P Ol Ol N O tr tT P O P tr r N m N l0 Ol M O lp rl tT l0 m O O r ~D O N N .~ P N O~ M r r M rl b O W ' m r M N O P r N In N M O lfl m lp In M ~D In Ol N In N N P .~ Ol O r M P IP m N 01 N ifl 01 P N m ~O ~ rl U W Tlp N PN O lpr Ol M O~OI Ol OO~.~ 61 r~i ~O OI N P MOl .-1 OO H BOO .-I O NmmN ~O 6lN P MOB J-1 M r H M r1 01 m l0 O N O N Ol H O rl O H r IP O r1 O P r N O r Ol O O O~ O .-I ifl l0 r N 0 .--I O P 7 r N M ~O P ~O l0 N M ~O P l0 m Ol M 01 P 01 lp N M ~O P l0 r N M r O~ N Ol lp M r P r ~O N M ~O P l0 ~ P P P P N S UI P iP l0 to ~f1 0 N M M \O M r N 6l N r N r1 T N P Ol N P N H M M N m N N O P O ~O Ol M N O~ N P E 'O ~ W O r M rl N r1 r r M r~ r O~ M M P N N m r M r N m r H M M ~l Ol m N M O P rl m r M r if) m H l~ N N N N N N r-1 rl ti H rl H N N N N N N N ~-i H H H H 1n M N P N N rl H H H rl ti N N N N N N H rl rl ri N .-1 ~ N N N N ti rl H rl N .y r-1 N N N N N N H H H -i N H N N N N N N H i N i -1 ~ x c r r r ~ . ~o % 3 UI W O O .~ O~ H O~ r N m N N r to M m M 0 r ~O O~ r l0 N O .ti ifl rl P H P P l0 l0 P W O~ M O l0 H 01 N O W 61 H H N lO M ~O m l9 ~P M ~O l0 N ~O m M N m lp r N r l0 P N m N~ N N M m l0 lp M N Ol N O N ~O ~ w U P M M O N N O~ O O~ rl tr H M r 6~ N O~ O N r N N m '-1 N O N m m ifl to P Ol .-i r Ol ~O O~ N P M O~ C N r .~ M N r Ol .ti O N O H r \O O Ol O P r l0 O r O~ N O Ol O N if) lp N P O M N N r N 0 N O P H r ~O M ~D P l0 m Ul M Ol P Ol r tf] M l0 P r r N M r O~ N P P P P tr ~ M r P r m P M r P M H ,~ ,~ ~ N ~O Ir7 M l0 P ~O N 3 bl O rl M N ~O M Ol O r M r Ifl 01 N O\ N r N N Ol M r 1 N N r N O~ N rl M M N m N N O P O ~O N N ~0 m m 0 O\ N P O\ N P ~ ~ M P In N ti r M 0 In O r .~ M M ul Ol m H M O P H O O N N M l0 m r M r to m H W C N N N N N ti H .~ ,~ ,~ ~~ .-1 N M N P N N ,~ H r1 rl N .~ N N N N N N ~ ,~ ti H rl ,~ ~D N N itl N .~ ,-~ H .~ H .-~ ,-V N N N N N N ,~ l -~ l N -V N N N N N N 1 -1 N N ~ ~ N N N N N N ~ roH r . r . r . . , . N N ,~ r1 ,-I W N N O P In H ri N m lp r N Ol 01 m .-i Ol m N O~ ~p N P Ol N m ,~ N ~9 Ol P N N O N M r P m M N N N N SA U) A~ rl N ri r rl P (T H P 10 P r l0 M r P N Ul ra N O~ rl N r M M m 0 ~O O rl O H N O O m l0 m r H m 7 N W Ol O O ~O ~O m N N N l0 M N r r IP r l0 r r N M P ~O ~ m rl m In m N P P O l0 rl lfl N N P t0 In if) U1 r~ r r N r N r rl .1 f-I H N rV N N rl ti r N ~O rl r m M 10 ~D O r % N N N ~-~I N V E H f0 N 1~ 1~ YP W m P ll~ N r l0 M M P P M N Ol ~ rl r 0 ~O m N .~ l0 N ~O Ol N O P O N Ol lp lp r r r .~ rl O rl O ri 0 0 0 0 0 0 ~ r'I N M 0 0 0 0 0 0 N P lD P ~D 0 0 0 0 0 0 N N .-1 N .1 N N N O l N N N N N N ~O rl M ~O M r1 Ifl 10 u1 u~ 10 N N N N N N N N 11 0 0 0 0 0 0 0 0 0 0 0 0 r O ri 0 0 0 0 0 0 .~ M O ti O M H ~ M P OMO P 0 0 0 0 0 0 0 0 0 0 0 0 Q D ~ r O r1 O H 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 N 0 0 0 0 0 0 I I 0 0 0 0 0 0 I 0 0 0 0 0 0 I I I I 0 0 0 0 0 0 0 0 0 0 0 0 I I I 0 0 0 0 0 0 0 0 0 0 0 0 Q E U b~N Y C to W 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 N (~ ~~ b 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 G ~ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 N um b io ~LO~~~ M M M M rrrrrr rrrrrr 000000 rrrrrr ~o io io io io ~o rrrrrr ~ ~ M M M M M M M M M M M M M M M M M M M M M M M M IP N N N i0 10 M M M M M M P P P P P P M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M N % N J~ N IP W N r N l0 M r-i M 61 m M M 0 rl m ~-i lp lD P ~ 01 O r l0 N ul N N P l0 O M m P N Ol O N P O O M M l0 lp O~ r ~O r M O O m Ol r M O P 01 U r P O~ M N Ol P M l0 t0 O~ Y ~ N y N m Ol N N N rl Qi l0 O r H l0 P m u7 Ol ~O r r1 M r N m l N r N P r N W m H W O P Ol r N ~-I m P m m r-1 H 01 O P m r N r P m [~] to ri O O\ ,-i O H N ~-~I .~ N .~ N M M N M N M P rl If1 N r M P .-'I N N r M P .'~ lO N r M M MMM M M O M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M P P M P M P P P M P M P P P M P M P M M M M M M Q M M M M M M M M M M M M M M M M M M M M M M M M M M N O 4J N U1 E M r m m ~O ~ O IMO~n ~p lp M M M ~O io r M N~ N r Ol N N m N P O1 N P m N P Ol N N m N P O M ~P r M m N~ r O r Mr~nr rrMrinr mrMr~nm mrMr~nm mrM rum mrMr~nr ~` H 1~ U] N N N N N N .-1 H H .~i .-1 N N N N N N H ri H H H r i N N N N N N H rl H H H rl N N N N N N H H H H H H N N N N N N H 1 H N N N N N N N N N N N N ~1 ~ ~ H H ~-i H H ri .ti H H .-1 H H H r1 .ti r' ~+ F-1 ~/ c aaaaaa aaaaaa aaaaaa aaaaaa aaaaaa aaaaaa aaaaaa b O '. i N ~+>+>+>+N O O r i N N O N N N N>+~+ O O H i f l N O N N S+~+N >+ O O N ]i N>+r N~ N N N N N>+ i~ N>+N i~ N N>+N r>+>+ Q J~ O H N ul O N N ~fJ H N O O N N N O O N~ O N O O O O r i N N O O O H N N O O O r l N N O N N N N O H N In O rl N ~ N O rl N N y r ~ _ • m ~ Q CL H H H H F F H F H H F H F F F F F F F H H F F F F F H H H F H H F H H F H F F H H H ~ 7 O U] to N m M [n 0 0 0 m N N m N N ~ N y m M !n M V7 UI m N N to M N N N N m N VI to m to y !n fn y N Ul s+ 0 0 0 w a a a w a 0 0 0 0 0 0 w a a a a w 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 pr c7 a a a a a a a a w w a a w w w a w a w a a a w w a w a w w a ,~ G'. 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