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Home My WebLink AboutSW4190901_SuppEZ-2018-Version-2.1.1-2-Signed_1/20/2020SUPPLEMENT-EZ COVER PAGE FORMS LOADED FORMS LOADED Signature of Designer Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 1 3 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 4 Type of SCM Sand Filter 5 Total BUA in project (sq ft) 64704 sf 6 New BUA on subdivided lots (subject to permitting) (sq ft) 7 New BUA outside of subdivided lots (subject to permitting) (so 27020 sf 8 Offsite - total area (sq ft) sf 9 Offsite BUA (sq ft) sf 10 Breakdown of new BUA outside subdivided lots: Parking (sq ft) 17890 sf Sidewalk (sq ft) sf Roof (sq ft) 7734 sf Roadway (sq ft) Future (sq ft) Other, please specify in the comment box below (sq ft) 1396 sf sf sf 11 New infiltrating permeable pavement on subdivided lots (sq ft) sf 12 New infiltrating permeable pavement outside of subdivided lots (sq ft) sf 13 Exisitng BUA that will remain (not subject to permitting) (sq ft) sf 14 Existing BUA that is already permitted (sq ft) 37,684 15 Existing BUA that will be removed (sq ft) sf 16 Percent BUA 57% 17 Design storm (inches) 1 in 18 Design volume of SCM (cu ft) 4044 cf 19 Calculation method for design volume Simple Method ADDITIONAL INFORMATION 20 Please use this space to provide any additional information about the drainage area(s): The Family Dollar site to the south was previously submitted. NCDEQ was unable to find the plans so we used aerial and survey data to estimate the BUA. The new sand filter and detention covers both sites. DRAINAGE AREA INFORMATION Entire Site 1 4 Type of SCM 5 Total BUA from project (sq ft) 6 1995 rules SL 2006-246 2008 rules 2017 rules 7 New BUA on subdivided lots (subject to permitting) (sq ft) 1995 rules SL 2006-246 2008 rules 2017 rules 8 New BUA outside of subdivided lots (subject to permitting) (so 1995 rules SL 2006-246 2008 rules 2017 rules 9 Offsite - total area (sq ft) 1995 rules SL 2006-246 2008 rules 2017 rules 10 Offsite BUA (sq ft) 1995 rules SL 2006-246 2008 rules 2017 rules 11 IDesign storm (inches) 1995 rules SL 2006-246 2008 rules 2017 rules 12 Breakdown of new BUA: Parking (sq ft) Sidewalk (sq ft) Roof (sq ft) Roadway (sq ft) 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 outside of subdivided lots (sq ft) 15 Exisitng BUA that will remain (not subject to permitting) (sq ft) 16 Existing BUA that is already permitted (sq ft) 17 Existing BUA that will be removed (sq ft) 18 Percent BUA 19 Design volume of SCM (cu ft) 20 Calculation method for design volume ADDITIONAL INFORMATION 21 Please use this space to provide any additional information about the drainage area(s): SAND FILTER 1 Drainage area number 1 2 esign vo ume o cu s 3 Is the SCM sized to treat the SW from all surfaces at build -out? Yes 4 Is the SCM located away from contaminated soils? Yes 5 What are the side slopes of the SCM (H:V)? 100:1 6 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No 7 Are the inlets, outlets, and receiving stream protected from erosion (10- year storm)? Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes 9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice 10 If applicable, will the SCM be cleaned out after construction? Yes 11 Does the maintenance access comply with General MDC (8)? Yes 12 Does the drainage easement comply with General MDC (9)? Yes 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC (10)? 14 Is there an O&M Agreement that complies with General MDC (11)? Yes 15 Is there an O&M Plan that complies with General MDC (12)? Yes 16 Does the SCM follow the device specific MDC? Yes 17 Was the SCM designedy an NG licenseapro essiona . es 23 Volume that can be retained in the sediment chamber (cubic feet) Will there be a permanent pool in the sediment chamber? 2181 cf 24 No 854.20 25 Bottom of the sediment chamber (fmsl) 26 Area of the sediment chamber (square feet) 710 sf 27 Physical depth of the sediment chamber (inches) 36 in 28 Ponding depth in the sediment chamber, above any permanent pool (inches) 29 lElevation of top of weir between chambers (fmsl) 859.2 Sand Chamber 30 Volume that can be retained in the sand chamber (cubic feet) 2123 cf 31 Bottom of the sand chamber (fmsl) 854.20 32 Area of the sand chamber (square feet) 692 sf 33 Physical depth of the sand chamber (inches) 24 in 34 Ponding depth in the sand chamber, above any permanent pool (inches) 35 Elevation of the bypass device (fmsl) 859.2 36 Type of bypass device Weir 37 Mechanism for distributing flow over the sand surface Weir 38 Sand specification for sand chamber C33 39 Depth above underdrain pipe (inches) 24 in 40 Will the media be maintained to drain at least two inches per hour at the sand surface? Yes 41 Is at least one clean -out pipe provided at the low point of each junderdrain line? lWill c can-ou pipes a capped? INFORMATION Yes 42 Yes ADDITIONAL 43 Please use this space to provide any additional information about the ISand Filter(s): This design is provided by Storm Trap and the above information is Sand Filter 1 4:14 PM 1/14/2020