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Home My WebLink About20060180 Ver 1_Stormwater Info_20070220E'/I / 3764 Rominger Road Banner Elk, NC 28604 Ph/Fax: 828-297-6946 EI'1V11~01'11Y1~~ ~~ ~~'~+^ a-mail: wccJv(dskybest.com February 14, 2007 Ms Cyndi Karoly NC DENR DWQ Wetlands/401 Unit 1621 Mail Service Center Raleigh, NC 27699-1621 D ~~D F ~U RE: Laurelmor Development, Watauga and Wilkes Counties, NC EB 2 O ~ p p J DWQ Project#: 20060180, USACE Action ID No. 200630172 Phase One -Stormwater Management Plan ~iR- wgrER ~.gTpR,~Q~~l7y Dear Ms Karoly: ~H On behalf of my client, Ginn LA-Laurel Creek Ltd., LLLP, and the project engineer, McGill Associates P.A., I have enclosed the Stormwater Management Plan for Phase One of the Laurelmor Development. The entire project site is approximately 6100 acres. This area has been divided into three main development phases. Phase boundaries are based on a proposed schedule for future completion of roads and amenities in different portions of the development. At the current time, construction activities are concentrated in Phase One and we are at a planning point to submit a comprehensive Stormwater Management Plan. It is our intent that these materials will demonstrate that the only area in Phase One that will require a written, comprehensive Stormwater Management Plan, as required by condition #22 in WQC No. 3576 issued 6-12-06 ("Condition 22"), is the proposed Clubhouse-Core area. Phase 1 consists of approximately 2,236 acres on the eastern side of the development. This area will include approximately 21.7 miles of roads, 544 single family residential lots, an 18-hole golf course, and the Clubhouse-Core area containing the clubhouse, condominiums, shops, facilities, and parking. The entire area of Phase 1 has been divided into 31 sub-basins ranging from 14 acres to 128 acres (see Phase 1 Sub-Basin Delineation Map). For each sub-basin the total proposed impervious area has been calculated and is summarized in the attached Phase-1 Stormwater Management Plan Table of Impervious Areas. Proposed features considered in the impervious calculations are roads, driveways, rooftops, and parking areas. For all single family lots, a total impervious cover of 10,000 square feet is assumed. All roads are assumed to have an impervious width of 22 feet. Using these figures, total impervious cover, by sub-basin, ranged from 0.0% to 14.22%. The total imperviousness for the entire area of Phase 1 is approximately 8%. In addition to the calculations described above, there are two sub-basins (1-17 and 1-20) that will contain zones of high density development. High density areas are those where the percent imperviousness of a sub-basin or other smaller hydrologic sub-unit exceeds 30%. These areas are shown on the attached Laurelmor Site Plan Phase Map. Individual Stormwater Management Plans are included for each zone of high density development. An example preliminary Stormwater Management Plan was brought to the 11-27-2006 meeting to demonstrate, in concept, our plan for meeting the SWM requirement of 85% removal of TSS. The final comprehensive plan is attached and includes detailed calculations, worksheets, O&M agreements and other required materials for each area. It is important to consider that, while not included in the comprehensive Stormwater Management Plan required by Condition 22, the applicant has committed to stormwater management measures that go way beyond those required. As described in the 404/401 Individual Permit Application, all runoff from • Page 2 February 15, 200? golf course tees, fairways, and greens will be directed to bio-filtration measures prior to discharge at or above stream buffers. In addition, stormwater management planning for all single family lots will incorporate measures to treat runoff from roof tops and parking areas using small rain gardens, sand filters or similar measures. Authority for planning/design/construction oversight, inspection, and maintenance enforcement has been incorporated into the CC&R's for the development. It is our hope that we have adequately demonstrated that the majority of the Phase 1 portion of the Laurelmor development has been designed to be low density and that we have successfully worked to keep total site imperviousness to less than 9% as we stated in the 404/401 Individual Permit application. We also hope that you will find the attached Stormwater Management Plan -Laurelmor Core Area to be complete and comprehensive with regard to condition #22 of the Water Quality Certification. If you have any questions regarding this submittal please call me at 828-297-6946, Chris Brown at McGill Associates at 828-328-2024 thank you. 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O d O O J ~ 7 . .~ i Q Q L ao a E °' a as _ p L N1 M '- a, L `~ ~a°`~ L a ~ ~ i N Q L ~ ~ v ~ o N ~ N O r Q J O N ~ ~ ~ ~ • ~ L + + ~ H ~ Q ~ v L Q O C .Q ~ ~ ~ ~ J ~ Z 'C ~ d O ~ d N O ~ H d N Ri .C ~ d i i M N Q V ~ ~ :~ N O H M d t0 a STORMWATER MANAGEMENT PLAN LAURELMOR CORE AREA WATAUGA CO., NORTH CAROLINA • DOUGLAS CHAPMAN, P.E. l~/IcC1~11 A 5 5 0 C I A T E 5 Engineering • Planning • Finance Post Office Box 1136 Hickory, North Carolina 28603 January 22, 2007 ~ ~~~ F EE3 ~ ®2007 ~-y~,~~, w5 ~ Ewa ~~aw+r~w r'i~~LAND~S A`'~ • LAURELMOR CORE AREA STORMWATER MANAGEMENT PLAN NARRATIVE PROJECT DESCRIPTION The proposed project consists of golf course, resort area and a surrounding residential community. This submission is for the Laurelmor Core Area development. This area consists of a clubhouse, condominiums, outdoor amphitheater underground parking and surface parking areas. Drainage and erosion control measures will be designed fora 25 yr. storm period. The total disturbed area is approximately 24.78 acres. For stormwater management, nineteen (19) bioretention facilities have been designed and strategically located throughout the core area to catch and treat stormwater runoff from impervious areas. The entire project site is located on about 6,100 acres of land in southeastern Watauga County, North Carolina. ADJACENT PROPERTY The majority of land use in the vicinity is rural with some residential areas, but mainly undeveloped. • SITE DESCRIPTION The site is presently wooded and undeveloped. The site consists of ridges and valleys with named streams on site. These streams drain to Elk Creek, Laurel Creek, or Dugger Creek (a tributary to Elk Creek). The entire project site lies within an Outstanding Resource Waters (ORW) area as designated by NC Department of Environment and Natural Resources. Post-development: Post-development drainage patterns will remain similar to the pre-development. Stormwater from impervious areas will be collected and a management facility, bio-retention, will be used to treat and control discharges. STORMWATER MANAGEMENT There are a total of nineteen (19) bioretention facilities proposed for the core area. Throughout the project, stormwater will be collected by swales or catch basins and piped to the bioretention areas as storm water management facilities. In several areas, sheet flow will carry stormwater drainage to the bioretention areas. Where piping is necessary, outlet pipes will discharge to a manifold pipe. The manifold pipe will be 18" HDPE with perforations to dissipate flow entering the bio-retention area. The ends of the manifold pipes shall be capped. Where applicable, pipes shall discharge into grassed buffer areas, which will act as forebays to pre-treat and dissipate flows. Piped stormwater systems are designed for the 25-year storm event. The bioretention • facilities are designed to treat the first one inch of rainfall and to maintain the predevelopment runoff volume using retention storage. • Each bioretention facility is comprised of a planting medium, a mulch layer, plant material, and an underdrain pipe system. The facility is depressed to allow for a minimal ponding area. The planting medium is made up of a homogenous soil mix of 85%-88% construction sand; 8%-12% fines (silt and clay) and 3%-5% organic matter. This medium shall be 3' deep. The mulch layer shall consist of 3" of hazdwood mulch or chips and be at least 6 months old. The plantings shall be of native vazieties, as shown on the plans (such as Inkberry, Wax Myrtle, Common Witchhazel and Winterberry Holly). Eighteen of the bioretention azeas shall have a temporary ponding depth of 9", while Bio-11 shall have a 12" ponding depth. Underdrain pipes shall be 6" perforated PVC pipes with end caps, laid in a gravel layer. The underdrain pipes will be terminated into an outlet control structure (precast concrete catch basin). The bioretention facility shall be used to remove pollutants from stormwater runoff, by allowing for filtration and biological activity. The plantings will also provide for an aesthetically pleasing landscape environment. STORMWATER MAINTENANCE The stormwater management facilities shall initially be maintained by the Developer, and ultimately by the Property Owners Association. (See Operation and Maintenance Agreement.) The facilities shall be checked and maintained on a regular basis. Repairs and or replacements shall be made as deemed necessazy to assure proper performance of the bio-retention facilities. • • • OPERATION AND MAINTENANCE AGREEMENT • STORMWATER MANAGEMENT OPERATION AND MAINTENANCE AGREEMENT LAURELMOR CORE AREA - BIORETENTION FACILITIES WATAUGA CO., NORTH CAROLINA The stormwater management system is defined as a series of bioretention facilities distributed throughout the core area site in the Laurelmor Development. The system relies mainly on sheet flow to the numerous bioretention facilities. Other collection methods include catch basins, storm drainage pipes, roof leaders, and grassed swales. Grassed swale areas are used as forebays to aid in mitigation and pre-treatment of flows entering the bioretention facilities. Manifold pipes are used to disperse flow entering the facilities directly from storm drainage pipes. Maintenance activities shall be performed as follows: After every significant runoff producing rainfall event and at least monthly: a. Inspect and repair the bio-retention areas for sediment accumulation, erosion, trash accumulation, and general condition. b. Remove mulch from around manifold holes and cleanouts. 2. Remulch any void areas whenever needed. At least once or twice a year add mulch if necessary (spring and fall). At least once every two years, remove old mulch and completely replace with new. 3. Inspect and repair the collection system (i.e. catch basins, piping, swales, underdrains and manifold • pipes etc.) twice a year, to maintain proper functioning. 4. Treat all diseased trees and shrubs when necessary. Remove and replace all dead and diseased vegetation, (that which is beyond treatment), twice a year. (Replanting shall take place at appropriate planting times.) Repair or replace planting stakes and support wires as necessary. 5. Water plant material as required for initial planting and for ongoing care. I acknowledge and agree by my signature below that I am responsible for the performance of the five 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. Print name: J. Patrick Warren, P.E. Ginn-LA Laurel Creek LTD.. LLLP Title: Vice-President Development Address: 389 Little Laurel Road Ext. Boone. North Carolina 28607 Phony Signa Date: • Page 1 of 2 • I, ~,Q ~(~ _ ~ E • ~ f~~~,c_;> , a Notary Public for the State of Iyl~ Y ~.I(7J ~ r f'1(a ,County of ~`'~z~_u)~a , do hereby certify that ~Gij'Y)PS ~a~-Y~~ ~~~r~en personally appeared before me this ~ day of ~-e.br ua~, Dt1 ,and acknowledge the due execution of the forgoing stormwater management maintenance requirements. 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PROJECT INFORMATION (please complete the following information): ~~~ Project Name : a ~~ o ~ ~ ~''^ Contact Person: ' h r~Z s ~ n Phone Number: (~a41 3 ~ 8' - a, U ~ For projects with multiple basins, specify which basin this worksheet applies to: ~ e` c-z - Permanent Pool Elevation Temporary Pool Elevation Bioretention Surface Area Drainage Area Impervious Area Rational C Coefficient Size Inlet Velocity Inlet flow depth Depth to Ground Water Planting Soil Infiltration Rate In-Situ Soil Infiltration Rate a3~'~=~ ft. (elevation of the orifice invert out) a3 (~ , ?$ ft. (elevation of the outlet structure invert in) ~_ sq. ft. ~ , S4; ac. (on-site and off-site drainage to the basin) . tO k(e __ ac. (on-site and off-site drainage to the basin) ~ % (either 5% in w/sand under drain or 7% in w/o) ,~. _ ~~- fps . gam- in > i a ft. 7„ in./hr. (the soil layer down to 4 feet) ( in.lhr. (the soil layer below 4 feet or below the sand bed) II. REQUIRED ITEMS CHECKLIST Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a . requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. No vertical sand bed is proposed C The bioretention area is at least 40 feet by 15 feet. G Sheet flow is provided at inlet. (',C3 Water table depth is greater than 6 feet. ~ Minimum of 6" ponding is provided. , G><3 The ponded area will draw down in less than 4 days. ~ '~ Planting soil infiltration rate is greater than 0.52 in/lrr. G(j The in-situ soil infiltration rate is greater than 0.2 in/hr. C ~ A planting plan with species and densities is provided. G{~ Mulch layer is specified in plans. GCji Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) ~(j Plan details for the bioretention area provided. ~ Plan details for the inlet and outlet are provided. G>D An operation and maintenance agreement signed and notarized by the responsible party is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains r1 t. J DWQ Project No. • DIVISION OF WATER QUALITY • BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name : cl r~~ o ~ ~ ~''^ Contact person: C,1n r ~ s r-o~ w n _ Phone Number: (~2 - ~ his worksheet applies to: ~ i c-~ -~ ~.. For projects with multiple basins, specify which basin t Permanent Pool Elevation hI 2 3(0`7 ~ ~' ft. (elevation of the orifice invert out) Temporary Pool Elevation ~31a`l~ ?S ft. (elevation of the outlet structure invert in) Bioretention Surface Area ~' r o 5 S sq. ft. Drainage Area ~ SS9 ac. (on-site and off-site drainage to the basin) Impervious Area - ?~ (o ac. (on-site and off-site drainage to the basin) Rational C Coefficient - ~ Size % ~ °/: (either 5% in wlsand under drain or 7% in wlo) Inlet Velociiy ~ • ~ ~ fPs Inlet flow depth . ? i in Depth to Ground Water 7 1 a ft. Planting Soil Infiltration Rate 1, in./hr. (the soil layer down to 4 feet) In-Situ Soil Infiltration Rate ( in./hr. (the soil layer below 4 feet or below the sand bed) II. REQUIRED ITEMS CHECKLIST Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a • requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. No vertical sand bed is proposed G The bioretention area is at least 40 feet by 15 feet. -G~ Sheet flow is provided at inlet. j!,f3 Water table depth is greater than 6 feet. Minimum of 6" ponding is provided. , The ponded area will draw down in less than 4 days. gib Planting soil infiltration rate is greater than 0.52 inmr. G[~ The in-situ soil infiltration rate is greater than 0.2 in/hr. C. ~ A planting plan with species and densities is provided. Gb Mulch layer is specified in plans. GCi Planting soil meets minimum soil specifications (NCDENR Storrnwater Best Management Practices Manual, April 1999) G(j Plan details for the bioretention area provided. ,~ Plan details for the inlet and outlet are provided. G O An operation and maintenance agreement signed and notarized by the responsible party is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains r 1 U DWQ Project No. • DNISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name : ~ r~~ o Q ~ ~''-~~ Contact Person: Clr~ r ~ s ~o~ ~ ~ _ Phone Number: (7~aX1 ~ ~ 8' - ~ ~ For projects with multiple basins, specify which basin this worksheet applies to: ~ i r> --a Permanent Pool Elevation a3~~7, SU ft. (elevation of the orifice invert out) Temporary Pool Elevation ~ 3 ?~. ~l w ft. (elevation of the outlet structure invert in) Bioretention Surface Area Drainage Area Impervious Area Rational C Coefficient Size Inlet Velocity Inlet flow depth Depth to Ground Water Planting Soil Infiltration Rate In-Situ Soil Infiltration Rate ~ , sq. ft. ac. ~; ~ ac. . lv -] fps y p in > 1 a ft. 1, in.lhr ( in.mr II. REQUIRED ITEMS CHECKLIST (on-site and off-site drainage to the basin) (on-site and off-site drainage to the basin) (either 5% in wlsand under drain or 7% in wlo) (the soil layer down to 4 feet) (the soil layer below 4 feet or below the sand bed) Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a • requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional infonmation and will substantially delay final review and approval of the project. No vertical sand bed is proposed G The bioretention area is at least 40 feet by 15 feet. L~ Sheet flow is provided at inlet. -~r,t3 Water table depth is greater than 6 feet. G(j Minimum of 6" ponding is provided. , G~3 The ponded area will draw down in less than 4 days. fib Planting soil infiltration rate is greater than 0.52 in/hr. G(j The in-situ soil infiltration rate is greater than 0.2 in/nr. ~: ~ A planting plan with species and densities is provided. G>3 Mulch layer is specified in plans. GCS Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) G(j Plan details for the bioretention area provided. l ~ Plan details for the inlet and outlet are provided. G ~ An operation and maintenance agreement signed and notarized by the responsible party is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains • DWQ Project No. • DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name : ct r*Z~ d ~ .'-~ Contact Person: Ch r i c r'o.~.r r, Phone Number: (~~k1 ~ 1 8' - a d ~ ~ For projects with multiple basins, specify which basin this worksheet applies to: _ ; c, -ZF Permanent Pool Elevation 233u;~c~ ft. (elevation of the orifice invert out) Temporary Pool Elevation 'c13 3Q , ? S ft. (elevation of the outlet structure invert in) Bioretention Surface Area 67 sq. ft. Drainage Area ac. (on-site and off-site drainage to the basin) Impervious Area . 3 O ac. (on-site and off-site drainage to the basin) Rational C Coefficient . b Size % ? % (either 5% in w/sand under drain or 7% in wlo) Inlet Velocity 3 , ~~o fps Inlet flow depth . G W in Depth to Ground Water 7 1 a ft. Planting Soil Infiltration Rate 1, in./hr. (the soil layer down to 4 feet) In-Situ Soil Infiltration Rate ~ in./hr. (the soil layer below 4 feet or below the sand bed) II. REQUIRED ITEMS CHECKLIST Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a • requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specfications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. No vertical sand bed is proposed Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains G The bioretention area is at least 40 feet by 15 feet. G Sheet flow is provided at inlet. [~,Q Water table depth is greater than 6 feet. G6 Minimum of 6" ponding is provided. G6 The ponded area will draw down in less than 4 days. - ~ib Planting soil infiltration rate is greater than 0.52 in/hr. G6 The in-situ soil infiltration rate is greater than 0.2 in/hr. C.+(~,_A planting plan with species and densities is provided. G{~ Mulch layer is specified in plans. GC~i Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) G6 Plan details for the bioretention area provided. GCS Plan details for the inlet and outlet are provided. G>D An operation and maintenance agreement signed and notarized by the responsible party is provided. • DWQ Project No. DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name: a ~.~r-~,o,r Q a,e., ~s~~'~-~ Contact Person: ' h r? s r'o w ,~ Phone Number: (~2R1 '3 ~ R' - a ~ For projects with multiple basins, specify which basin this worksheet applies to: ~ r~ -- .ry Permanent Pool Elevation a 3 5 U U ft. (elevation of the orifice invert out) Temporary Pool Elevation ~3 ft. (elevation of the outlet structure invert in) Bioretention Surface Area Drainage Area Impervious Area Rational C Coefficient Size ~ ~ 5d sq. ft. ~ ac. a-2 ac. • ~D 7 (on-site and off-site drainage to the basin) (on-site and off-site drainage to the basin) (either 5% in w/sand under drain or 7% in w/o) Inlet Velocity Inlet flow depth Depth to Ground Water Planting Soil Infiltration Rate In-Situ Soil Infiltration Rate REQUIRED ITEMS CHECKLIST 5, 5~- fps .lob in 7 1 ~ ft. 1, in./hr. in.mr. (the soil layer down to 4 feet) (the soil layer below 4 feet or below the sand bed) Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a . requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. Aoolicants Initials _ No vertical sand bed is proposed C The bioretention area is at least 40 feet by 15 feet. G Sheet flow is provided at inlet. [~t3 Water table depth is greater than 6 feet. ~ Minimum of 6" ponding is provided. G6 The ponded area will draw down in less than 4 days. - ~d Planting soil infiltration rate is greater than 0.52 inmr. GL3 The in-situ soil infiltration rate is greater than 0.2 in/hr. C ~ A planting plan with species and densities is provided. G~ Mulch layer is specified in plans. GCi Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) G6 Plan details for the bioretention area provided. G[3 Plan details for the inlet and outlet are provided. G O An operation and maintenance agreement signed and notarized by the responsible party is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains U DWQ Project No. DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name : c~ r~~ (.~ ~ ~''^ Contact Person: Gl., r ; c •-o.,,~ ,~ Phone Number: (~1'~~1 '~ ~ 8' - a, i For projects with multiple basins, specify which basin this worksheet applies to: _ „ i r~ - L4 Permanent Pool Elevation a3 s3, Oa ft. (elevation of the orifice invert out) Temporary Pool Elevation ~'/ X3.75 ft. (elevation of the outlet structure invert in) Bioretention Surface Area Drainage Area Impervious Area Rational C Coefficient Size I ~ q sq. ft. l . 5 ~., ac. .~ _] (on-site and off-site drainage to the basin) (on-site and off-site drainage to the basin) (either 5% in w/sand under drain or 7% in w/o) Inlet Velocity Inlet flow depth Depth to Ground Water Planting Soil Infiltration Rate In-Situ Soil Infiltration Rate II. REQUIRED ITEMS CHECKLIST 'j , 3 S fps . ~-[ Co in > i a ft. 1. in.lhr 1 in./hr I y-'1c~ /~ i Fn j d ~ i~ ~',~ (the soil layer down to 4 feet) (the soil layer below 4 feet or below the sand bed) Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a • requirement has not been met, attach an explanation of why. At a minimum, a complete storrnwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. No vertical sand bed is proposed G The bioretention area is at least 40 feet by 15 feet. L • Sheet flow is provided at inlet. (',G Water table depth is greater than 6 feet. C.~j Minimum of 6" ponding is provided. GB The ponded area will draw down in less than 4 days. - G.ib Planting soil infiltration rate is greater than 0.52 inlhr. G(j The in-situ soil infiltration rate is greater than 0.2 inmr. C. ~_A planting plan with species and densities is provided. G~ Mulch layer is specified in plans. GC3 Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) G6 Plan details for the bioretention area provided. ,~ Plan details for the inlet and outlet are provided. G ~ An operation and maintenance agreement signed and notarized by the responsible party is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains • DWQ Project No. • DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name : a r~~ o ~ ~ •''^ ' Contact Person: Lh r ~ s r'b~w ,~'~ Phone Number. (73"~R1 ~ ~ 8' - ~ For projects with multiple basins, specify which basin this worksheet applies to: ~ i c-~ -'~ Permanent Pool Elevation o-'23~ 3, ~~ ft• (elevation of the orifice invert out) Temporary Pool Elevation ~ 3 53.7 S ft. (elevation of the outlet structure invert in) Bioretention Surface Area Drainage Area Impervious Area Rational C Coefficient Size co 9 ac. . CD (on-site and off-site drainage to the basin) (on-site and off-site drainage to the basin) (either 5% in w/sand under drain or 7% in w/o) Inlet Velocity Inlet flow depth Depth to Ground Water Planting Soil Infiltration Rate In-Situ Soil Infiltration Rate II. REQUIRED ITEMS CHECKLIST ~{.C~~ fps '7 J. in > i a ft. 1 in.lhr ( in.lhr ~o pna..i ~Gld ri~~ (the soil layer down to 4 feet) (the soil layer below 4 feet or below the sand bed) Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a requirement has not been met, attach an explanation of why. At a minimum, a complete storrnwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. No vertical sand bed is proposed G The bioretention area is at least 40 feet by 15 feet. G Sheet flow is provided at inlet. [,~i Water table depth is greater than 6 feet. GCS Minimum of 6" ponding is provided. , G8 The ponded area will draw down in less than 4 days. gib Planting soil infiltration rate is greater than 0.52 inihr. G(j The in-situ soil infiltration rate is greater than 0.2 inmr. L ~, A planting plan with species and densities is provided. G{~ Mulch layer is specified in plans. GC'i Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) G(3 Plan details for the bioretention area provided. C ~ Plan details for the inlet and outlet are provided. G D An operation and maintenance agreement signed and notarized by the responsible party is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains ~1 ~J DWQ Project No. • DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name : ~ r~~ o ~ ~ ~''^ ~ Contact Person: ' lr~ r ~ s ~o w ~ Phone Number: ('ii"2S1 ~ 1 8' - ~ For projects with multiple basins, specify which basin this worksheet applies to: ~ . ~~ --' ~ Permanent Pool Elevation a 3 b-? ~ S 0 ft. (elevation of the orifice invert out) Temporary Pool Elevation ~3 Zo~:~S_ ft. (elevation of the outlet structure invert in) Bioretention Surface Area Drainage Area Impervious Area Size Inlet Velocity Inlet flow depth Depth to Ground Water Planting Soil Infiltration Rate In-Situ Soil Infiltration Rate a ( sq. ft. l ~'tiV ac. I ~ t '3 ac. i7 ~ .~~ fps Q7 in > > a ft. 1, in.lhr in./hr II. REQUIRED ITEMS CHECKLIST (on-site and off-site drainage to the basin) (on-site and off-site drainage to the basin) (either 5% in w/sand under drain or 7% in w/o) (the soil layer down to 4 feet) (the soil layer below 4 feet or below the sand bed) Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a • requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. No vertical sand bed is proposed G The bioretention area is at least 40 feet by 15 feet. G Sheet flow is provided at inlet. _~~~_Water table depth is greater than 6 feet. G(S Minimum of 6" ponding is provided. , G(3 The ponded area will draw down in less than 4 days. ~b Planting soil infiltration rate is greater than 0.52 in/hr. GC3 The in-situ soil infiltration rate is greater than 0.2 inihr. L y3 A planting plan with species and densities is provided. G{~ Mulch layer is specified in plans. GC3 Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) G(j Plan details for the bioretention area provided. .>~ Plan details for the inlet and outlet are provided. G ~ An operation and maintenance agreement signed and notarized by the responsible party is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains • DWQ Project • DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): ~~~ Project Name : at~,--~1 ~o r' Die- csG~•~., Contact Person: Ch r ~ s ~o s~ Phone Number: (~~k1 ~ ~ 8' - a.O ~ For projects with multiple basins, specify which basin this worksheet applies to: (?~7 ~ - q Permanent Pool Elevation a'J~$~.~Q ft• (elevation of the orifice invert out) Temporary Pool Elevation ~3 ~-f S.?.~ ft. (elevation of the outlet structure invert in) Bioretention Surface Area Drainage Area U sq. ft. : '7 g ac. (on-site and off-site drainage to the basin) Impervious Area , 3 3 ac. (on-site and off-site drainage to the basin) Rational C Coefficient Size % : ~ ~ % (either 5% in w/sand under drain or 7% in wlo) Inlet Velocity Z ~ o ~0 fps Inlet flow depth '~ ~ in Depth to Ground Water 7 1 a ft. Planting Soil Infiltration Rate 1 in.mr. (the soil layer down to 4 feet) In-Situ Soil Infiltration Rate ~ in.mr. (the soil layer below 4 feet or below the sand bed) II. REQUIRED ITEMS CHECKLIST Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a • requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. No vertical sand bed is proposed G The bioretention area is at least 40 feet by 15 feet. G Sheet flow is provided at inlet. (~,(3 Water table depth is greater than 6 feet. ~ Minimum of 6" ponding is provided. , G6 The ponded area will draw down in less than 4 days. ~b Planting soil infiltration rate is greater than 0.52 in/hr. G(j The in-situ soil infiltration rate is greater than 0.2 in/hr. C: ~ A planting plan with species and densities is provided. G{3 Mulch layer is specified in plans. GC~i Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) ~(~ Plan details for the bioretention area provided. l ~ Plan details for the inlet and outlet are provided. G O An operation and maintenance agreement signed and notarized by the responsible party is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains ~r ~ f~J DWQ Project No. • DIVISION OF WATER QUALITY • BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name : cL r~~ ~ ~ ~''^ Contact person: C1r ,r? s r--ot~ r~ -Phone Number. (7~~ - a For projects with multiple basins, specify which basin this worksheet applies to: ~~ i r~ I o Permanent Pool Elevation a3 3~, a Q ft. (elevation of the orifice invert out) Temporary Pool Elevation a~3 a.7 5 ft. (elevation of the outlet structure invert in) Bioretention Surface Area . O d sq. ft. Drainage Area , '~ S~ ac. (on-site and off-site drainage to the basin) Impervious Area . ~'~-- ac. (on-site and off-site drainage to the basin) Rational C Cceffcient . Lo Size % -7 % (either 5% in w/sand under drain or 7% in w/o) Inlet Velocity 0 fps Inlet flow depth ~ ~ in Depth to Ground Water 7 1 a ft. Planting Soil Infiltration Rate 1, in./hr. (the soil layer down to 4 feet) In-Situ Soil Infiltration Rate ( in./hr. (the soil layer below 4 feet or below the sand bed) II. REQUIRED ITEMS CHECKLIST Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. ~~ No vertical sand bed is proposed C C~ _The bioretention area is at least 40 feet by 15 feet. G Sheet flow is provided at inlet. _~~,~ Water table depth is greater than 6 feet. G~j Minimum of 6" ponding is provided. , G6 The ponded area will draw down in less than 4 days. ~b Planting soil infiltration rate is greater than 0.52 in/hr. G[3 The in-situ soil infiltration rate is greater than 0.2 inlhr. C. ~ A planting plan with species and densities is provided. G~ Mulch layer is specified in plans. G6 Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) G(3 Plan details for the bioretention area provided. ~ Plan details for the inlet and outlet are provided. G ~ An operation and maintenance agreement signed and notarized by the responsible parry is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains ~~ L_J DWQ Project No. • DNISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name : 1-c~ ~~ rho r^ (J~,a~ S.,O.''^e-~+'~ ~a S 2 ~ v~d ~ ~~-~ Contact Person: Gln r ~ s r-o w n Phone Number: (~2~ -31 R' - ~ O ~ For projects with multiple basins, specify which basin this worksheet applies to: ~ . r~ - I 1 Permanent Pool Elevation •~ 3 t-i 5 ~ ~ U ft. (elevation of the orifice invert out) Temporary Pool Elevation a ~ ~ (a 4 L ~ ft. (elevation of the outlet structure invert in) Bioretention Surface Area Drainage Area ~ C7 S s 3 sq. ft. a , ~ ac. (on-site and off-site drainage to the basin) Impervious Area 1 : ~-(~ ac. ~ (on-site and off-site drainage to the basin) Rational C Coefficient . 8 Size % ~ % (either 5% in w/sand under drain or 7% in wlo) Inlet Velocity a ~~ fps Inlet flow depth ~ 3 in Depth to Ground Water 7 1 a ft. Planting Soil Infiltration Rate 1. in./hr. (the soil layer down to 4 feet) In-Situ Soil Infiltration Rate 1 in.lhr. (the soil layer below 4 feet or below the sand bed) II. REQUIRED ITEMS CHECKLIST Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a • requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. No vertical sand bed is proposed G The bioretention area is at least 40 feet by 15 feet. L Sheet flow is provided at inlet. (',C3 Water table depth is greater than 6 feet. ~ Minimum of 6" ponding is provided. , fib The ponded area will draw down in less than 4 days. ~b Planting soil infiltration rate is greater than 0.52 irUhr. Gl3 The in-situ soil infiltration rate is greater than 0.2 inlhr. c: ~ A planting plan with species and densities is provided. G>3 Mulch layer is specified in plans. GCS Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) G(j Plan details for the bioretention area provided. ,.[~ Plan details for the inlet and outlet are provided. G O An operation and maintenance agreement signed and notarized by the responsible party is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains C DWQ Project • DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): ~~~ Project Name : cl r~~ ~ o ~' t~~ v2 ~ p~-+-, Contact Person: ' h r ~ s o N +~ Phone Number: j't~~R1 '3 ~ 8' - a o ~_ For projects with multiple basins, specify which basin this worksheet applies to: ~ i c-~ - I ~. Permanent Pool Elevation ~ 3 `'~ L~CiG ft. (elevation of the orifice invert out) Temporary Pool Elevation ~3 ~-I f .? ft. (elevation of the outlet structure invert in) Bioretention Surface Area Drainage Area a.~ i l Q sq. ft. i , ~~-- ac. (on-site and off-site drainage to the basin) Impervious Area ~ ~7 1 ac. (on-site and off-site drainage to the basin) Ratio„al C Coefficient Size % ~ ~ -7 % (either 5% in wlsand under drain or 7% in w/o) Inlet Velocity '-~e Q ~ fps Inlet flow depth "7 ~ in Depth to Ground Water 7 1 a ft. Planting Soil Infiltration Rate 1- in.lhr. (the soil layer down to 4 feet) In-Situ Soil Infiltration Rate I in.mr. (the soil layer below 4 feet or below the sand bed) II. REQUIRED ITEMS CHECKLIST Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a • requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. No vertical sand bed is proposed C The bioretention area is at least 40 feet by 15 feet. G~i -Sheet flow is provided at inlet. (~,d Water table depth is greater than 6 feet. ~ Minimum of 6" ponding is provided. G8 The ponded area will draw down in less than 4 days. ~b Planting soil infiltration rate is greater than 0.52 inihr. G(j The in-situ soil infiltration rate is greater than 0.2 inmr. ~; ~ A planting plan with species and densities is provided. Gi3 Mulch layer is specified in plans. GC's Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) G(3 Plan details for the bioretention area provided. ~ Plan details for the inlet and outlet are provided. G(3 An operation and maintenance agreement signed and notarized by the responsible party is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains • DWQ Project No. • DIVISION OF WATER QUALITY - B IORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name : cl ~-~ o d ~ ~''^ Contact Person: G b,r~; c r-~`~., ~ _ Phone Number. (~"~5'1 ~ ~ 8' - a, O ~~ For projects with multiple basins, specify which basin this worksheet applies to: ~ ; r~ -' I ~ _ Permanent Pool Elevation o2 3 S 3 G ~ ft. (elevation of the orifice invert out) Temporary Pool Elevation ~3 53 . ~ S ft. (elevation of the outlet structure invert in) Bioretention Surface Area _~?]_,_ sq. ft. Drainage Area l .1.`'f ac. (on-site and off-site drainage to the basin) Impervious Area + ac. (on-site and off-site drainage to the basin) rZaiiuii8i ~ Civefr~l£^t , Size % ~ % (either 5% in w/sand under drain or 7% in w/o) Inlet Velocity S, ~ ~ _ fps ~$ i Inlet flow depth n , Depth to Ground Water 7 1 ~ ft. Planting Soil Infiltration Rate 1 in./hr. (the soil layer down to 4 feet) In-Situ Soil Infiltration Rate ( in./hr. (the soil layer below 4 feet or below the sand bed) II. REQUIRED ITEMS CHECKLIST initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a • requirement has not been met, attach an explanation of why. At a minimum, a complete storrnwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. No vertical sand bed is proposed G The bioretention area is at least 40 feet by 15 feet. G Sheet flow is provided at inlet. ~',t3 Water table depth is greater than 6 feet. ~ Minimum of 6" ponding is provided. , G6 The ponded area will draw down in less than 4 days. c-ib Planting soil infiltration rate is greater than 0.52 inihr. G(3 The in-situ soil infiltration rate is greater than 0.2 in/hr. ~: ~ A planting plan with species and densities is provided. C{~ Mulch layer is specified in plans. GCi Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) G(j Plan details for the bioretention area provided. ,~ Plan details for the inlet and outlet are provided. G ~ An operation and maintenance agreement signed and notarized by the responsible party is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains • DWQ Project No. • DIVISION OF WATER QUALITY • BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name : cl r~~ ~ cs %''^ ' Contact Person: Gh r ~ s r-~. r, r~ _ Phone Number: 0'281 '3 ~ `•~ - a. For projects with multiple basins, specify which basin this worksheet applies to: _~ i c-~ - I i{ Permanent Pool Elevation C Q ft. (elevation of the orifice invert out) Temporary Pool Elevation ft. (elevation of the outlet structure invert in) Bioretention Surface Area Drainage Area Impervious Area ~uuv~u~ v v~.°.~~~°~t SIZe ~, ~f a~_ sq. ft. ~~ ac. ao ac. r4 ~] (on-site and off-site drainage to the basin) (on-site and off-site drainage to the basin) (either 5% in wlsand under drain or 7% in wlo) Inlet Velocity Inlet flow depth Depth to Ground Water Planting Soil Infiltration Rate In-Situ Soil Infiltration Rate 1, bC fps Cy in > > a ft. 1. in.mr ( in.Ihr (the soil layer down to 4 feet) (the soil layer below 4 feet or below the sand bed) II. REQUIRED ITEMS CHECKLIST Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a • requirement has not been met. attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. No vertical sand bed is proposed G The bioretention area is at least 40 feet by 15 feet. G Sheet flow is provided at inlet. (',Q Water table depth is greater than 6 feet. ~ Minimum of 6" ponding is provided. GB The ponded area will draw down in less than 4 days. ~b Planting soil infiltration rate is greater than 0.52 in/hr. G(j The in-situ soil infiltration rate is greater than 0.2 in/hr. c. ~ A planting plan with species and densities is provided. G-{~ Mulch layer is specified in plans. Gi3 Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) G(j Plan details for the bioretention area provided. ,~ Plan details for the inlet and outlet are provided. G ~ An operation and maintenance agreement signed and notarized by the responsible party is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains • DWQ Project No. • DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name : ct r~~ ~ ~ ~''^ Contact Person: Gh r - s r-oLN ~ Phone Number: (2X1 '3 ~ R' - ~ c For projects with multiple basins, specify which basin this worksheet applies to: ~ i c7 --~ ('~ Permanent Pool Elevation ~ 3 ~ ~ ft. (elevation of the orifice invert out) Temporary Pool Elevation ft. (elevation of the outlet structure invert in) Bioretention Surface Area "l . `[ R O sq. ft. Drainage Area - ~ ac. (on-site and off-site drainage to the basin) Impervious Area ~ ~ ac. (on-site and off-site drainage to the basin) Rational C Cca"iciant • `'~ Size % ~ % (either 5% in wlsand under drain or 7% in wlo) Inlet Velocity ~~ ~p fps Inlet flow depth . o~ in Depth to Ground Water 7 1 a ft. Planting Soil Infiltration Rate 1- in.lhr. (the soil layer down to 4 feet) In-Situ Soil Infiltration Rate ( in.lhr. (the soil layer below 4 feet or below the sand bed) II. REQUIRED ITEMS CHECKLIST Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a • requirement has not been met, attach an explanation of why. At a minimum, a complete stomtwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. Cb No vertical sand bed is proposed _ G (~-The bioretention area is at least 40 feet by 15 feet. G Sheet flow is provided at inlet. ~.{3 Water table depth is greater than 6 feet. G(j Minimum of 6" ponding is provided. G6 The ponded area will draw down in less than 4 days. c,6 Planting soil infiltration rate is greater than 0.52 inmr. G(~ The in-situ soil infiltration rate is greater than 0.2 in/hr. ~:~ A planting plan with species and densities is provided. G>3 Mulch layer is specfied in plans. G6 Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) G(j Plan details for the bioretention area provided. ,L3 Plan details for the inlet and outlet are provided. G ~ An operation and maintenance agreement signed and notarized by the responsible party is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains U DWQ Project No. • DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name : a r~~ ~ ~ ~'~^ Contact Person: C,1^ r ~ c ~'oLN ~ Phone Number: (~2%1 ~ 1 8- - ~ ~ For projects with multiple basins, specify which basin this worksheet applies to: ~ ~ (a Permanent Pool Elevation a~k'-~. 6 y ft. (elevation of the orifice invert out) Temporary Pool Elevation ~l3 S'4.75 ft. (elevation of the outlet structure invert in) Bioretention Surface Area Drainage Area Impervious Area Ra6c;~ai C Ccefficie^± Size Inlet Velocity Inlet flow depth Depth to Ground Water Planting Soil Infiltration Rate In-Situ Soil Infiltration Rate "? ~O 8~3 sq. ft. ~, ((~ ac. F $ ~v ac. ~ ~o ~~- , ~ `~ fps t (0 9' in > i a ft. 2 in.mc ( in.ihr (on-site and off-site drainage to the basin) (on-site and off-site drainage to the basin) (either 5% in w/sand under drain or 7% in wio) (the soil layer down to 4 feet) (the soil layer below 4 feet or below the sand bed) REQUIRED ITEMS CHECKLIST Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a • requirement has not been met, attach an explanation of why. At a minimum, a complete storrnwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. Aoolicants Initials _~~ No vertical sand bed is proposed G The bioretention area is at least 40 feet by 15 feet. G i Sheet flow is provided at inlet. -1~ Water table depth is greater than 6 feet. G+6 Minimum of 6" ponding is provided. GB The ponded area will draw down in less than 4 days. - Lib Planting soil infiltration rate is greater than 0.52 in/hr. r: ~ The in-situ soil infiltration rate is greater than 0.2 inihr. C. ~ A planting plan with species and densities is provided. G{~ Mulch layer is specified in plans. GC~i Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, Apri11999) G6 Plan details for the bioretention area provided. G~ Plan details for the inlet and outlet are provided. G t3 An operation and maintenance agreement signed and notarized by the responsible party is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains DWQ Project No. • DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): F Project Name : a rY-~ (.~ ~ %'~-~ Contact person: C,h . ~ ~ ~-~ .v ~ - Phone Number. (~'2 - ~ For projects with multiple basins, specify which basin this worksheet applies to: ~ i c-~ - 17 Permanent Pool Elevation ~`-~ C~ 0~ ft. (elevation of the orifice invert out) Temporary Pool Elevation ~ GO ~ ft. (elevation of the outlet structure invert in) Bioretention Surface Area ~t_(Q ~~3 sq. ft. Drainage Area of , 1 Z ac. (on-site and off-site drainage to the basin) Impervious Area (. 3 z ac. (on-site and off-site drainage to the basin) Rational C Coefficient .. w Size % -7 % (either 5% in w/sand under drain or 7% in w/o) Inlet Velocity I fPs Inlet flow depth + c in Depth to Ground Water 7 1 a ft. Planting Soil Infiltration Rate 1. in./hr. (the soil layer down to 4 feet) In-Situ Soil Infiltration Rate I in.mr. (the soil layer below 4 feet or below the sand bed) II. REQUIRED ITEMS CHECKLIST Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. !f a • requirement has not been met, attach an explanation of why. At a minimum. ~ complete stomtwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. No vertical sand bed is proposed G The bioretention area is at least 40 feet by 15 feet. L-~ Sheet flow is provided at inlet. (~,~ Water table depth is greater than 6 feet. ~ Minimum of 6" ponding is provided. , Gab The ponded area will draw down in less than 4 days. ~b Planting soil infiltration rate is greater than 0.52 iNhr. G[~ The in-situ soil infiltration rate is greater than 0.2 in/hr. C. ~ A planting plan with species and densities is provided. G{3 Mulch layer is specified in plans. G(3 Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, Aprit 1999) G(j Plan details for the bioretention area provided. ~i Plan details for the inlet and outlet are provided. G ~ An operation and maintenance agreement signed and notarized by the responsible party is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains • • DWQ Project DIVISION OF WATER QUALITY • BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): F Project Name : ~, cl r~~ ~ ~ ~''^ Contact Person: _ C1r, r ~ s r-o~~ r~ -Phone Number: (~2k'1 "3 ~ 8' - a O ~ ~ For projects with multiple basins, specify which basin this worksheet applies to: _~ i c-~ - 1 ~S Permanent Pool Elevation ~ 39 ~ . 0 ~' ft. (elevation of the orifice invert out) Temporary Pool Elevation d39 ~-1 ~"~S ft. (elevation of the outlet structure invert in) Rinr?tontinn Rilrf~ro Area __~ sq. ft. Drainage Area , (o g ac. (on-site and off-site drainage to the basin) Impervious Area ((,~L ac. (on-site and off-site drainage to the basin) Rational CCoefficient - `'~ Size % 7 % (either 5% in w/sand under drain or 7% in wlo) Inlet Velocity ~- ~ 4 ~ fps Inlet flow depth • (7 Cc in Depth to Ground Water J 1 ~ ft• Planting Soil Infiltration Rate 1 in.lhr. (the soil layer down to 4 feet) In-Situ Soil Infiltration Rate 1 in./hr. (the soil layer below 4 feet or below the sand bed) II. REQUIRED ITEMS CHECKLIST Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a • requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. ~C~~ No vertical sand bed is proposed C L~ The bioretention area is at least 40 feet by 15 feet. G Sheet flow is provided at inlet. (',Q Water table depth is greater than 6 feet. ~ Minimum of 6" ponding is provided. , G6 The ponded area will draw down in less than 4 days. Gib Planting soil infiltration rate is greater than 0.52 in/hr. Gt3 The in-situ soil infiltration rate is greater than 0.2 in/hr. C. ~ A planting plan with species and densities is provided. Gt3 Mulch layer is specified in plans. GC3 Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) G(j Plan details for the bioretention area provided. ,~ Plan details for the inlet and outlet are provided. G D An operation and maintenance agreement signed and notarized by the responsible party is provided. Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains • DWQ Project No. • DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name : ~- cl r~~ ~ ~ ~''^ Contact-Person: Lh r ~ s r'o~~ +~'~ Phone Number: (~2ti1 '31 F~' - :~, i For projects with multiple basins, specify which basin this worksheet applies to: ~~~, I `~ Permanent Pool Elevation d 3`7 ~ ,~C _ ft. (elevation of the orifice invert out) Temporary Pool Elevation ~~-7 0l ,?5 ft. (elevation of the outlet structure invert in) Bioretention Surface Area Drainage Area Impervious Area i r~ n„..u.,.,,...i i;aii~iia~ ~. v~cuwroi~~ Size a ~ ~ ~'~._ sq. ft. I '1 ac. (o ac. ;(a ~7 (on-site and off-site drainage to the basin) (on-site and off-site drainage to the basin) (either 5% in w/sand under drain or 7% in w/o) Inlet Velocity Inlet flow depth Depth to Ground Water Planting Soil Infiltration Rate In-Situ Soil Infiltration Rate [~{, I ~ fps ,5b m > ~ a ft. 7„ in./hr in./hr m 0.v' i IBC 1 ~ ,Q ~ ~ C. (the soil layer down to 4 feet) (the soil layer below 4 feet or below the sand bed) II. REQUIRED ITEMS CHECKLIST Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a • requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project. No vertical sand bed is proposed Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains C The bioretention area is at least 40 feet by 15 feet. G' Sheet flow is provided at inlet. (~,~i Water table depth is greater than 6 feet. G+(j Minimum of 6" ponding is provided. , G8 The ponded area will draw down in less than 4 days. L b Planting soil infiltration rate is greater than 0.52 in/hr. G[3 The in-situ soil infiltration rate is greater than 0.2 inmr. C:l(~ A planting plan with species and densities is provided. G~ Mulch layer is specified in plans. GC'i Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management Practices Manual, April 1999) G~ Plan details for the bioretention area provided. ,>3 Plan details for the inlet and outlet are provided. G ~ An operation and maintenance agreement signed and notarized by the responsible party is provided. • • BIORETENTION DESIGN CALCULATIONS n ~~ Laurelmor Core Area Bioretention JOB N0.05800 BIORETENTION CALCULATIONS • GINN -LA LAUREL CREEK LTD. LLLP LAURELMOR CORE AREA - BIORETENTION AREAS BIORETENTION CALCULATIONS PER PRINCE GEORGE' S COUNTY, MD. SPECS AND CRITERIA Determine Design Storm: The amount of rainfall (P) needed to initiate direct runoff: Pea = 0.2x((1000/CNpre)-10) Paa = 0.2x((1000/60)-10) PZa = 1.33 inches Account for variation in land cover: Multiply Paa by a factor of 1.5 1.33 x 1.5 = 1.99 inches Compare the one-year 24 hour storm event = 2.75 inches (per map for NC) Use higher value -Use Pia = 2.75 inches Determine storage volume required to maintain Predevelopment Runoff Volume using retention storage using Chart Series A (Prince George's County ,Maryland; Bioretention Design Specifications and Criteria) PZa = 2.75 inches Interpolate using 2" rainfall chart and 3" rainfall chart: Use Pre-development CN = 60 (100% Woods) Use Post-development Weighted CN: 485,062 sq.ft. impervious area CN = 11.14ac. @ 98 45% @ 98 = 44.10 594,036 sq.ft. lawn area CN = 13.64ac. @ 61 55% @ 61 = 33.55 77.65 Use Post-development CN = 78 Using Chart A, Type II, 2" storm -~ .42 Using Chart A, Type II, 3" storm ~ .80 Through interpolation ~ (.80 -.42)(.75) + .42 = .71" Therefore, Storage Volume required to maintain the predevelopment runoff volume using retention storage = .71" Laurelmor Core Area Bioretention JOB NO. 05800 BIORETENTION CALCULATIONS Apply the .71" to our site: • (.71" x 24.78 acres) / 12 = 1.47 ac-ft. Use 1.47 ac-ft. Determine volume required for Water Quality Control: Requirement ~ First 1 inch of run-off from impervious area: 24.78 acres -Total Drainage Area 11.14 acres impervious (45% of the site) Apply the 1" to our site: (1" x 11.14 imp. acres) / 12 = .93 ac-ft. Use 1.47 ac-ft. Since this will be less than the volume determined to maintain predevelopment volume Use 1.47" Determine storage volume required to maintain Predeveloped Peak Runoff Rate using 100% retention. Use Chart Series B (Prince George's County ,.Maryland; Bioretention Design Specifications and Criteria) Pza = 2.75 inches Interpolate using 2" rainfall chart and 3" rainfall chart Using Chart B, Type II, 2" storm ~ .40 Using Chart B, Type II, 3" storm ~ .75 Through interpolation ~ (.75 -.40)(.75) +.40 = .66" Apply the .66" to our site: (.66" x 24.78 acres) / 12 = 1.36 ac-ft. Since this is less than storage needed for Predevelopment runoff volume Use volume for predevelopment runoff ~ 1.47 ac-ft. (NO ADDITIONAL DETENTION STORAGE IS REQUIRED) DETERMINE BIORETENTION SIZING NEEDED TO ACCOMMODATE VOLUME REQUIREMENTS: The volume required is 1.47 ac-ft. = 64,033 cu.ft. Nineteen (19) Bioretention areas will be built. See spreadsheet and plans for areas of • each Bioretention facility. Laurelmor Core Area Bioretention JOB NO. 05800 BIORETENTION CALCULATIONS • • The total area (19 Bioretention Facilities) = 83,794 sq. ft. Each Bioretention Facility will have a permanent ponding depth of 9", with the exception of Bioretention Area 11. Bio-11 will have a permanent ponding depth of 12": Bio-1 through Bio-19 excluding Bio-11 - 73,241 sq.ft. @ 9" = 54, 931 cu.ft. Bio-11 - 10,553 sq.ft. @ 12" = 10.553 cu.ft. 65,484 cu.ft. Total required volume (19 Bioretention Facilities) = 64,033 cu.ft. Total actual volume (19 Bioretention Facilities) = 65,484 cu.ft. CDB 1/19/07 C] u • i ~ ' 'i Z ~ I I '. I I I '~~. 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C -+ ~ _ N O O N O O N O O N O O N O O N O O O w ~ U d I 01 O W ~ M (O ~ M r O In O LL } ~ N 4'/ O O M O ~ W LL i ~ ~ i0 O O O ~ `y ~ ~ (Cp M O O M O OD (0 O V O ~ - ~ n ~ O # ~ ~ m ~ (n ~ M # j U F ~ m U U O U ~ _ W r O ~ V M U U U U o l U U LL i C .N w U M O r O M O UD f0 ~ O V O l0 m U v v v, co ~n ~n O G O o O O O O t LL C - C ii N r N n N ~ N n N n N h f6 L > N N~ ~ N O ~ OD i0 M O ~ O Q O O O O O 7 ~ ~ ~ ~ f~0 O O O O O O LL7 M ED V N C M M M ~ M M M M - N N N N N N C_ N N I O O O ~ ~ O C O O t0 I~ Q O C M M M M C M - N N N N y N N O O O ~ O ~ O 7 7 ~ '. '~~ l0 R N ~0 N 00 n OD O f0 O N ~ M M M M M M (A i N N N N N N ~ ao f~ (0 ~ ~ v M r ~ m ~ m m m ~ m m Q U U U U p U U N O n OC7~ U O o ~. m a aa°iQ E L o U U W Q J 5 N Q ~ U j, o Z ir, U ~ ~ N O ~ ~ ~o~~ . ~ ~ 3 a`~i U ~ ~ ~ Z d ~JUI H fn , ~ ~ I' I O ~' N ~ aMD O I ~ O Q W m Q ~ I ! I ~ N '. R M M ~ I ~ N O ~ II f0 OD OD CO ~ ~ M fG ~ M O U ~ N i O M ~ ~ N GM O O n lL LL U I j G D ro O 'n t 0 'ri N ~ ~ ~° ~ + o I ' o ~ o o ~ v o aD n ,~ n ~ ,~ ~ ~ ~ O ~ N r ~ I 00 -. ._... O r ~ ~~ J ~ ~ ~ i O (O I I I LL7 a t0 N N t0 ~ M ~ O N E °~ N_ C N I ! ~ ~ ~ II ~ ~ ~ N N ~ C L G- ~ ~ I I N O O N O O N O O N O O N O O N O O O O~ ~ O O i ~ O ~ ~ F Q N v a LL ~ E O ~ N I O O O O Of N CA M O O O O LL N - __ CA I Q f0 r ~ ~ ~ ~ ~ i I ~ ~ N ~ ~ ~ tN o N r ~ N # o p i p W O p U ~ ` C7 U D p ~ C7 00 U ~ m m! m m N f m m m aD U m m ~ o ~ . m U U U p U v i p U p U ~ ~ -I ~ ~ I rn o o v C .y Q V ~ I N ~ V ui m U ~ I O n n aD n m p O ', O O O O O ~ ~ ~ L I N N N N N N LL - c , n n n ~ I n n _ +-- -- ~ ~ I = m y U - ~~ m I ~ n ~ N N N II rn n v N > ~ f0 Q II II n . N O O r O r O 7 U -. _ __ I ~ !. __. ' O O v 10[y n O O ~ OD O O O n O m n aD j ~ ~ M V R R M N ~ ~ V C ~ ~ N N N N N N N ~-_ N N N C > C yy YID ~ N ~ N N ~ mi O - ~ O O ~I O ~ ~ E ~ `~ ~, o ~ o n ~ n .mss. ~ ~ M M M M I ~ M h i N N N N !I N N ~`` ~ N C O ~ III # ~ N N H ~ ~ ~ I, ' # H N m I C ; 'I m U ~ p m U m U m U ~ p , m U 0 m U 2 ~C9~ U~o ~. m a ~o EL O U U W Q S ~v 5 d Q ~ U >, o Z ~n U ~ ~ N O ~ m U oy ~ ~ J N E c LL ~ z ~ E a`p o o fn ~ O I I O ~ O^ O M~ I ~ O I I O ' a Q W Ip ~ I t0 I n M (O ~ N N I O I I I (O I ~ m ~ ~ '' ~ I ~I. 'I I I I _ _+ i I > C i ~p I~~ 1M r ~ V; O OOi '. ~ I V' p U ~ M O ~ N 1 O O ~ - ~ 3 - -- ~ O O rn co ' v V a U ' N .p ~ ~ ~ I, N j ( a I I - - o I o 0 0 0 0 o I o I O I O p ~ p ~ b O ~ ~{ O ~ ~ N n '~ ~ ~ fn I O ~ ~ p p ~ ',. _ n O ~ OOO 'I, ~ O a O N ~ O it f0 Q ~ ' O ~ ~ (O O r O O t0 C ~ J m W I _.}-_ V' ~ f0 ~ f0 ~ R E N ~ N ~ r I ~ ~ r I ~ r v, r ao r an r u~ r I ao r ao r O N N N - N N N N N N N N C C O O ', O O O O O O O O O O O O O O O O - - ' - ___ ~ ~ 3 O N 0 0 F ° ~ N i. I O ~ ~ W V aD V ~ ~ (D N O M ,, ~ ~', II _ (O ~, _ OD E E r Q O ~ ~ ' O O N O t0 I O H I O N ~ V GD O N O (O ' ~ .._ _..F___ ~ ~ ~~ N I ~ N M N i ~~ O O O O N O t0 N 01 O r O O N O i ~ v ~ ~ - ~{ - m ~ m ~ ~ ~ ~ ~,II c O o U o m U o m U ° o U ° ~ o v o' ~ '' m m m m! m fn O I ^ m I I O m O m m M ~ F ~ ~ m 'I. M m E O LL m U U i I U U m U m U m U ° ' U I,, U N ~ M _ __ O O N O 01 r O C a U N N O O (O N O f0 N f° m U rt I v a v c c m m v, v O O ~ o O I O C O O O o O t N ~ N N N N N N N N - W ~ C - ~ C f~ f~ I f~ f~ ~ n ~ + h - ~ ~ y l6 N~ LL] ao I O ao i O O O O (O O t0 O N ~ 'I O O ~ ° Q O O O O N O O ~' N O 7 ° ~ r O ~ O Of O ''', '~ O Q1 aD O O N R O ~ (O I~ ~ O O Oi ~ O OD 47 O f~ ~ ~ O O O ~ O ~ I~ I O 1~ ~ O~ '~ O O aD O C - M N M N I M N M N M N M N M N M N M N ~, M N M N C I O W j ' O O O M N r ~ O n O n > C O OD M ~ Oi O M ~ O M ~ ~ M I O M ~ ~ O W M Ul - _._ ___ N N N N N , ' '' ~. 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