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Home My WebLink AboutSW5230802_Supplement-EZ Form_20230810 Operation & Maintenance Agreement Project Name: Chatham Habitat for Humanity Townhouse Development Project Location: Slier City, NC Cover Page Maintenance records shall be kept on the following SCM(s). This maintenance record shall be kept in a log in a known set location. Any deficient SCM 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 pollutant removal efficiency of the SCM(s). The SCM(s) on this project include(check all that apply&corresponding O&M sheets will be added automatically): Infiltration Basin Quantity: 0 Location(s): Infiltration Trench Quantity: 0 Location(s): Bioretention Cell Quantity: 0 Location(s): Wet Pond Quantity: 0 Location(s): Stormwater Wetland Quantity: 0 Location(s): Permeable Pavement Quantity: 0 Location(s): Sand Filter Quantity: 0 Location(s): Rainwater Harvesting Quantity: 0 Location(s): Green Roof Quantity: 0 Location(s): Level Spreader- Filter Strip Quantity: 0 Location(s): Proprietary System Quantity: 0 Location(s): Treatment Swale Quantity: 0 Location(s): Dry Pond Quantity: 1 Location(s): Southwest portion of property Disconnected Impervious Surface Present: No Location(s): User Defined SCM Present: No Location(s): Low Density Present: Yes Type: CLICK TO UPDATE O&M MANUAL I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed for each SCM above, and attached O&M tables. I agree to notify NCDEQ of any problems with the system or prior to any changes to the system or responsible party. Responsible Party: Chatham Habitat for Humanity Title &Organization: Mr. Harvey Harman, Director of Construction & Land Acquisition/Devi Street address: 467 West St. City, state, zip: Pittsboro, NC 27312 Phone number(s): 919-799-6819 Email: harveyharmand@chathamhabitat.org Signature: Date: , a Notary Public for the State of County of , do hereby certify that personally appeared before me this _ day of and acknowledge the due execution of the Operations and Maintenance Agreement . Witness my hand and official seal, Seal My commission expires STORM-EZ 5/11/2023 Version 1.5 O&M Agreement Page 1 of 1 SUPPLEMENT-EZ COVER PAGE LOAD SUPPLEMENT FORMS PROJECT INFORMATION — 1 Project Name Chatham Habitat for Humanity Townhouses 2 Project Area(ac) 3.12 3 Coastal Wetland Area(ac) 0 4 Surface Water Area(ac) 0 5 Is this project High or Low Density? Low 6 Does this project use an off-site SCM? No 7 Width of vegetated setbacks provided(feet) N/A 8 Will the vegetated setback remain vegetated? N/A 9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d)? N/A 10 Is streambank stabilization proposed on this project? No 11 Infiltration System 0 12 Bioretention Cell 0 13 Wet Pond 0 14 Stormwater Wetland 0 15 Permeable Pavement 0 16 Sand Filter 0 17 Rainwater Harvesting(RWH) 0 18 Green Roof 0 19 Level Spreader-Filter Strip(LS-FS) 0 20 Disconnected Impervious Surface(DIS) 0 21 Treatment Swale 0 22 Dry Pond 1 23 StormFilter 0 24 Silva Cell 0 25 Bayfilter 0 26 Filterra 0 LOAD SUPPLEMENT FORMS JGNER CERTIFICATION 27 Name and Title: Robert W.Brantiy,P.E.-Consulting Engineer 28 Organization: Engineering&Environmental Science Co. 29 Street address: 3008 Anderson Dr.Ste.102 30 City,State,Zip: Raleigh,NC 27609 31 Phone number(s): 919-781-7798 32 Email: e2s@bellsouth.net Certification Statement: I certify,under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or supervision;that the information provided in the form is,to the best of my knowledge and belief,true,accurate,and complete;and that the engineering plans, specifications,operation and maintenance agreements and other supporting information are consistent with the information provided here. Designer \\\ • \.\ CIA R o/',, Q SEAL < Sign ture of Designer . 041984 : - • ,-)1/ NisoG ��N /'" /W. P \ If " �l j331 \ Seal Date DRAINAGE AREAS 1 Is this a high density project? No 2 If so,number of drainage areas/SCMs 0 3 Does this project have low density areas? Yes 4 If so,number of low density drainage areas _ 1 Is all/part of this project subject to previous rule 5 versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 4 Type of SCM I Dry Detention 5 Total drainage area(sq ft) �i 465656 6 Onsite drainage area(sq ft) } 135907 7 Offsite drainage area(sq ft) 329749 8 Total BUA in project(sq ft) 83401 sf New BUA on subdivided lots(subject to permitting) 9 (sq ft) sf New BUA not on subdivided lots(subject to 10 permitting)(sf) 76617 sf 11 Offsite BUA(sq ft) 7684 sf 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) 7062 sf -Sidewalk(sq ft) 2465 sf -Roof(sq ft) 12672 sf -Roadway(sq ft) 6384 sf -Future(sq ft) 48034 sf -Other,please specify in the comment box below(sq ft) sf New infiltrating permeable pavement on 13 subdivided lots(sq ft) sf New infiltrating permeable pavement not on 14 subdivided lots(sq ft) sf Existing BUA that will remain(not subject to 15 permitting)(sq ft) 7684 sf 16 Existing BUA that is already permitted(sq ft) sf 17 Existing BUA that will be removed(sq ft) sf 18 Percent BUA 18% 19 Design storm(inches) 3.0 in 20 Design volume of SCM(cu ft) 25995 cf 21 Calculation method for design volume SCS IIIIEDNAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): Permit No. (to be provided by DWQ) y�oF wnr6-9pc Ati �� STORMWATER MANAGEMENT PERMIT APPLICATION FORM o - NCDENR 401 CERTIFICATION APPLICATION FORM DRY EXTENDED DETENTION BASIN SUPPLEMENT This form must be filled out,printed and submitted. The Required Items Checklist(Part IN must be printed,filled out and submitted along with all the required information. I. PROJECT INFORMATION Project name Chatham Habitat for Humanity Contact person Robert W.Brantly,P.E.(Consulting Engineer) Phone number 919-781-7798 Date 5/11/2023 Drainage area number 1 II. DESIGN INFORMATION Site Characteristics Drainage area 465,656.00 ft2 Impervious area 81,022.00 ft2 %Impervious 0.17 Design rainfall depth 2.99 in Peak Flow Calculations 1-yr,24-hr rainfall depth 2.99 in Rational C,pre-development See Caclulations (unitless) Rational C,post-development See Caclulations (unitless) Rainfall intensity:1-yr,24-hr storm 0.12 in/hr Pre-development 1-yr,24-hr peak flow 1.67 ft3/sec Post-development 1-yr,24-hr peak flow 7.38 ft3/sec Pre/Post 1-yr,24-hr peak control 5.71 ft3/sec Storage Volume: Non-SA Waters Minimum required volume 22,651.00 ft3 Provided volume 25,995.00 ft3 OK Sediment storage volume provided 7,502.00 ft3 OK Storage Volume: SA Waters 1.5"runoff volume ft3 Pre-development 1-yr,24-hr runoff volume ft3 Post-development 1-yr,24-hr runoff volume ft3 Minimum required volume ft3 Provided volume ft3 Sediment storage volume provided ft3 Basin Design Parameters Drawdown time 2.30 days OK SHWT elevation 609.00 fmsl Basin bottom elevation 612.00 fmsl OK Storage elevation 613.00 fmsl Basin side slopes 3.0 :1 OK Top elevation 617.00 fmsl OK Freeboard provided 3.48 ft OK Basin Bottom Dimensions Basin length 124.00 ft 1 Basin width 56,00 ft Length to width ratio 2.20 :1 OK Form SW401-Dry Extended Detention Basin-Rev.3 Parts I.&II.Design Summary,Page 1 of 2 Permit No. (to be provided by DWQ) Additional Information Total runoff volume captured by basin 3.30 ac-in Forebay is not required Forebay provided N (Y or N) Is basin in a recorded drainage easement? Y (Y or N) OK Does basin capture all runoff at ultimate build-out? Y (Y or N) OK Is a sediment depth indicator included? Y (Y or N) OK Does the basin include a drain? Y (Y or N) OK Form SW401-Dry Extended Detention Basin-Rev.3 Parts I.&II.Design Summary,Page 2 of 2