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Home My WebLink AboutSW6201005_Supplement-EZ Form_20230201SUPPLEMENT-EZ COVER PAGE ORMS LOADI PROJECT INFORMATION 1 lProiectName Project Area (ac) Coastal Wetland Area (ac) Surface Water Area (ac) Is this project High or Low Density? Does this protect use an off -site SCM? Wook Lake II Phase 1 19.42 0 6.13 Low No COMPLIANCE WITH 02H .1003(4) 7 Width of ve etated setbacks provided feet 30 8 Will the vegetated setback remain vegetated? Yes 9 If BUA is proposed in the setback, does it meet NCAC 02H.1003 4 c-d ? Yes 10 1 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 12 Bioretention Cell 13 Wet Pond 14 Stormwater Wetland 15 Permeable Pavement 16 Sand Filter 17 Rainwater Harvesting RWH 18 Green Roof 19 Level Spreader -Filter Strip LS-FS 20 Disconnected Impervious Surface DIS 21 Treatment Swale 22 Dry Pond 23 StormFilter 24 Silva Cell 25 Ba filter IFilterra 26 FORMS LOADED NER CERTIFICATION Name and Title: Organization: Street address: City, State, Zip: Phone number(s): Email: C. Scott Brown, PE 4D Site Solutions Inc. 409 Chicago Dr. Ste. 112 Raeford, NC 28376 910-426-6777 rrown(&4dsitesolutions.com 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. Seal Signature of Designer Date DRAINAGE AREAS 1 Is this a high density project? No 2 If so, number of drainage areas/SCMs 0 3 Does this oroiect have low densit areas? yes 4 If so number of low densit drainage areas 1 5 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site LID 1 4 Type of SCM 5 Total drainage area (sq ft 845721 845721 6 Onsite drainage area (sq ft 845721 845721 7 Offsite drainage area (sq ft 0 0 8 Total BUA in project (sq ft 130938 sf 130938 sf 9 New BUA on subdivided lots (subject to ermitting) (sq ft 71163 sf 71163 sf 10 New BUA not on subdivided lots (subject to permitting) (sf) 59775 sf 59775 sf 11 Offsite BUA (sq ft sf sf 12 Breakdown of new BUA not on subdivided lots: - Parking (sq ft - Sidewalk (sq ft 6050 sf 6050 sf - Roof (sq ft - Roadway s ft 53725 sf 53725 sf - Future (sq ft - Other, please specify in the comment box below (sq ft 13 New infiltrating permeable pavement on subdivided lots (sq ft 14 New infiltrating permeable pavement not on subdivided lots (sq ft 15 Existing BUA that will remain (not subject to ermitting) (sq ft 16 lExistina BUA that is already ermitted (sq ft 17 Existing BUA that will be removed (sq ft sf sf 18 Percent BUA 24% 24 0 19 IDesign storm inches 20 IDesign volume of SCM cu ft 21 lCalculation method for design volume ADDITIONAL INFORMATION INNEW Please use this space to provide any additional information about the 22 drainage area(s): LOW DENSITY DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 021-1 .1003 1 Is project below density thresholds set forth in the applicable stormwater rule? Yes 2 Does project maximize dispersed flow and minimize channelization of flow? Yes 3 Has the use of piping been minimized per .1003(2)(c)? Yes 4 Side slopes of the vegetated conveyances (H:V) 3 sf 5 1 Maximum velocity in the vegetated conveyances during the 10-year storm? 2 6 JAre curb outlet swales proposed? Yes 7 Maximum longitudinal slope of curb outlet swale(s) (% ) 2 8 Bottom width of curb outlet swale(s) (feet) 2 It 9 Maximum side slope of curb outlet swale(s) (H:V) 3:1 10 Minimum length of curb outlet swale(s) (feet) 155 It 11 Are treatment swales used instead of curb outlet swales? No 12 Is stormwater released at the edge of the setback as dispersed flow? Yes 13 Have stormwater outlets been designed to prevent downslope erosion? Yes 14 Are variations to rule .1003 proposed? No ADDITIONAL INFORMATION 15 JPlease use this space to provide any additional information about this low density project: Some of the swales on the site are outside of normal parameters. They are all to be constructed with a liner and have dissipaters at their outlets. Calculations for each ditch showing their stability and safety factor have been included with the submittal.