SW3180305_REVISED-6028_SSW-SuppEZ-20170329-DEMLR-SW_6/28/2019

SUPPLEMENT-EZ FORM COVER PAGE
Envlronnni
Quality
Please indicate the types, quantities and locations of SCMs that will be used on this project:
Quantity
Location(s)
Infiltration System
Bioretention Cell
Wet Pond
Stormwater Wetland
Permeable Pavement
Sand Filter
1
Northwest of proposed Health Sciences Building (near property line)
Rainwater Harvesting
Green Roof
Level Spreader -Filter Strip
Disconnected Impervious Surface
Treatment Swale
Dry Pond
Designer information for this project:
and Title:
et address:
, State, Zip:
ne number(s):
Designer
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Griselda Ruan, Designer
LandDesign
223 N. Graham St.
Charlotte, NC 28202
704-333-0325
anaaesian.com
Applicant:
Project Name:
Mitchell ommunuity College Health
Sciences Buildin
Address
706 Cherry Street
City / Town
Statesville, NC 28677
Company:
Mitchell Community College
Contact:
James Brewer
Mailing Address:
500 West Broad St
City, State, Zip:
Statesville, NC 28677
Phone number(s):
704-878-3205
Email:
[e-mail]
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
Marc D. Momsen and belief, true, accurate, and complete; and
Signature of Designer
June 28, 2019
Date
- 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.
Cover Page 1 12:35 PM 6/28/2019

SAND FILTER
Mitchell Communuity College Health Sciences Building
THE DRAINAGE AREA 1
Drainage area number
1
Break down of BUA in the drainage area (both new and existing):
Total coastal wetlands area (sq ft)
Parking / driveway (sq ft)
8067 sf
Total surface water area (sq ft)
Sidewalk (sq ft)
4182 sf
Total drainage area (sq ft)
87120 sf
Roof (sq ft)
20095 sf
BUA associated with existing development (sq ft)
Roadway (sq ft)
Proposed new BUA (sq ft)
32344 sf
Other, please specify in the comment box below (sq ft)
Percent BUA of drainage area
137%
ITotal BUA (sq ft)
32344 sf
COMPLIANCE WITH THE APPLICABLE STORMWATER PROGRAM
Stormwater program(s) that apply (please specify):
Design rainfall depth (in)
1.0 in
HydroCAD
Minimum volume required (cu ft)
2086 cf
Design volume of SCM (cu ft)
4894 cf
GENERAL MDC FROM 02H .1050
#1 Is the SCM sized to treat the SW from all surfaces at build -out? Yes #7 If applicable, with the SCM be cleaned out after construction? Yes
#2 Is the SCM located on or near contaminated soils?
No
#8 Does the mainetenance access comply with General MDC (8)?
Yes
#3 What are the side slopes of the SCM (H:V)?
31
#9 Does the drainage easement comply with General MDC (9)?
Yes
#3 Does the SCM have retaining walls, gabion walls or other engineered side slopes?
No
#10 If the SCM is on a single family lot, does the plat comply with General MDC (10)?
#4 Are the inlets, outlets, and receiving stream protected from erosion (10-year storm)?
Yes
#11 Is there an O&M Agreement that complies with General MDC (11)?
Yes
#5 Is there a a bypass for flows in excess of the design flow?
Yes
#12 Is there an O&M Plan that complies with General MDC (12)?
Yes
#6 What is the method for dewatering the SCM for maintenance?
SAND FILTER MDC FROM 02H .1056
Drawdown Orifice
#13 Was the SCM designed by an NC licensed professional?
Yes
#1 SHWT elevation (fmsl)
below 900 ft
#3 Volume of stormwater from drainage area during design storm (cubic feet)
2334 cf
#1 Type of sand filter (open or closed)
Open
#3 Total volume that can be stored above the sediment and sand chambers (cubic feet)
4894 cf
#1 If closed, describe if the filter will be pre -cast or pour -in -place:
#3 Is this sand filter designed to attenuate peak flows?
Yes
#3 Elevation of the bypass device (fmsl)
894.75 ft
#1 If closed, top of grate elevation (fmsl)
#3 Describe the bypass device:
#2 Volume that can be retained in the sediment chamber (cubic feet)
2447 cf
Emergency spillway
#2 Will there be a permanent pool in the sediment chamber?
No
#2 Bottom of the sediment chamber (fmsl)
892 ft
#4 Ponding depth from the top of the sand to the bypass device (ft) 1.72 ft
#2 Area of the sediment chamber (square feet)
1188 sf
#5 Describe the mechanism for distributing flow over the sand surface:
#2 Physical depth of the sediment chamber (inches)
36 in
Slope
#2 Ponding depth in the sediment chamber, above any permanent pool (inches)
21 in
#6 Sand specification for sand chamber
#2 Elevation of top of weir between chambers (fmsl)
894 ft
Cleaned, washed sand
#2 Volume that can be retained in the sand chamber (cubic feet)
2447 cf
#2 Bottom of the sand chamber (fmsl)
892 ft
#7 Depth above underdrain pipe (inches)
30 in
#2 Area of the sand chamber (square feet)
1188 sf
#8 Will the media be maintained to drain at least two inches per hour at the sand surface?
Yes
#2 Physical depth of the sand chamber (inches)
1 36 in
1#9 Is at least one clean -out pipe provided at the low point of each underdrain line?
Yes
#2 Ponding depth in the sand chamber, above any permanent pool (inches)
121 in
1#9 Will clean -out pipes be capped?
Yes
ADDITIONAL INFORMATION
Please use this space to provide any additional information about this sand filter that you think is relevant to the review:
Sand Filter 2 12:35 PM 6/28/20