20200357 Ver 2_Updated Stormwater EZ Form_20210209

SUPPLEMENT-EZ FORM COVER PAGE Please indicate the types, quantities and locations of SCMs that will be used on this project: Infiltration System Bioretention Cell Quantity Locatio_n~(~s)~---7401 Hilburn Drive Refresh Sheet (Click Button Below) Project Name: ~~ I Stormwater Wetland. ___ ----l'--------f------------------------------------i Permeable Pavement [ Hilburn Drive Duplex Lots Address ,--------Sand Filter 1 Rainwater Harvesting e-Green Roof 1 ___ L_e_ve_l_Sp_r_e_a~r-FiltElr_~lriJ)_ __ D_i_s_connected Impervious Surface Treatment Swale o------Dry Pond Designer information for this project: Name and Title: Organization: Street address: City, State, Zip: Phone number(s): Email: Desig_ner Cover Page ,,_-·'". !~··_:~;;;;; ,_ ~\\ vi-~Rr . .-:-'' '}'> --- - - --:_. u .·· ,-..' , o,;:E.SSin'-I •• · '--', -,~ "1\f -·/ -:::' < ,' '< --1 '' '1'/ ::: ' < ' ~-, 2f:_\L '-,-'17252 ......... ' -:';,;"~(< · _z:· ' -: -~ § ,if~ ~ ,;-.. .. !y G t ~ 1 -r: <..,. ·-" , _,, "" ... . '.' ,' ;_:,;?' !:~-~'~!~\-~~-:\ / Peter Cnossen -Engineer Jones & Cnossen Engineering, PLLC ------_______ _, 221 N. Salem Street, Suite 001 Apex, North Carolina 27502 919-387-1174 [e-mail] . "(? ~2= ""~" Below} ~ A'~ ---M Signa'tuTe of Designer r tl1A>t, Date 1 1704 Hilburn Drive City/_ T_o_'Nn Raleigh Applicant: Company: Marlowe & Moye, LLC Contact: Howard Moye Mailing Address: 314 w. Millbrook Road, Suite 013 City, State, Zip: Raleigh, North Carolina 27699 __ Phone number(s): 919-844-7888 Email: hmoyeiii@gnia_il.com Certification Statement: I certify, under penalty of law: that this Supplement-El 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. I am aware that there are significant penalties for submitting false information including the possibility of fines and imprisonment for knowing violations as well as a report being made to my professional board. 1·;1,_,/i;fJ<1!J'' (!th;],;, 5:07 PM 2/9/2021
BIORETENTION CELL Drainage area number Break down of BUA in the drainage area (both new and existing): -Parking / driveway (sq ft) --------------------------Hilburn Drive Duplex Lots 1 619 sf Total coastal wetlands area (sq ft) Total surface water area (sq ft) Total drainage area (sq ft) 6098 sf : ::;~:: ~:q ft) ------------------------I 2~2°5 s:f I BUA associated with existing development (sq ft) Proposed new BUA (sq ft) 3264 sf Percent BUA of drainage area 54% -Roadway (sq ft) -Other, please specify in the comment box below (sq ft) Total BUA (sq ft) 3264 sf -----~=~-----------~---_....,_..,.. _________ --------------=------~----.i...----~-H THE APPLICABLE STORMWATER PROGRAM Stormwater program(s) that apply (please seecify), Design rainfall depth (in) Town of Apex Minimum volume required (cu ft) ............................................. Design volume of SCM (cu ft) ;,ENERAL MDC FROM 02H ,105.0. 1 Is the SCM sized to treat the SW from all surfaces at build-out? I Y, ·~· ______ _ lS -2 Is the SCM located ~_ri_or near contaminated soils? i N I _________ ,__,________ _ ___ _ 0 -3 What are the side slopes of the SCM (H:V)? I 3 1 -~~_Does the SCM have retaining walls,, gabion walls or other engine_ered side slopes? I Y• 1#4 Are the inlets, outlets, and receiving stream protected from erosion (10-year storm)? I Y, !S -!S -#5 Is there a a bypass for flows in excess of the design flow?________ l N #6 What is the method for dewatering the SCM for maintenance? Otl 0 -1er -BIORETENTION CELL MDC #1 SHWT elevation (fmsl) FROM 02H .1052 1#1 Bottom of the bioretention cell (fmsl) ----------------344 _oft ---346_0 ft -1#6 Percentage of fines (silt and clay) by volume 1_0 in 274 cf 300 cf Yes Yes Yes Yes Yes Yes 75-85% # 1 Distance from bottom to SHWT (feet) > 2 ft --8-10% 5-10% #6 Percentage of organic matter by vol_u_m_e ___________________ ---1---------l #2 Surface area of the bioretention cell (square feet) #2 Design volume of the bioretention cell (cubic feet) #2 Ponding depth of the design storm (inches) #3 Is the bioretention cell used for p_e_ak attenuation? #3 Depth of pea_l(__a_ttenuation over planting surfacejinj #3 Height of peak attenuation outlet above the planting surface (in) #4 lnfiltratio~_rate of the in situ soil (inch/hour) 14 Diameter_of th_e underdrain pipes (if applicable) 14 Does the design include Internal Water Storage (IWS)? !4 if so, elevation of the top of the IWS (fmsl) 14 Elevation of the planting surface (fmsl) 5 Will the cell contain trees and shrubs? 5 Media depth (inches) NAL INFORMATION -----------------i 300 sf #6 Type of organic material 300 cf #7 Phosphorus Index (P-lndex) of media (unitless) 30 12 in ----#8 Will compacti_o_n be avoided during construction? Yes no #9 Will cell be maintained to a one inch/hour standard? Yes n/a #1 O Describe the planting plan: -n/a The bottom surface will consist of bermuda sod. -.01 in/hr ----4in -Yes #11 Depth of mulch, if applicable (inches) -348 #11 Type of mulch. if applicable ---349_5 ft -----Yes #12 How many clean out pipes are being installed? #12 Briefly describe thepretreatment that will b_e_u_s_e_d_: --------------c. . --I 30in Please use this space to provide any additional information about this bioretention cell that you think is relevant to the review: i: be;,,aiering of SCM will be by pumping -if req;;ired_ 2_ SHWT determined by S&EC_ ------------·····-··----------Bioretention 5:07 PM 2/9/2021