SW1210503_Supplement-EZ Form_20210730

SUPPLEMENT-EZ COVER PAGE
PROJECT INFORMATION
1 Project Name
2 Project Area (ac)
3 Coastal Wetland Area (ac)
4 Surface Water Area (ac)
5 Is this project High or Low Density?
6 Does this project use an off -site SCM?
Hot Sprinqs Microqrid
15.8
0
0
Low
No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided (feet)
8
Will the vegetated setback remain vegetated?
9
If BUA is proposed in the setback, does it meet NCAC 02H. 1 003(4)(c-d)?
10
Is streambank stabilization proposed on this project?
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
Bayfilter
26
Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Jeffrey Ruppert
28
Organization:
SEI Engineering
29
Street address:
39845 Matthews Lane
30
City, State, Zip:
Paonia, CO 81428
31
Phone number(s):
970.527.3920
32
Email:
[e-mail]
Certification Statement:
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.
C "4NA
Signature of Designer
OgMsgnetl by —Rapped,
P.E.
ON:0=Rapped, P.E.',
=Usun—s,e,ee.
Jeff Ruppert, P.E. E=;eff,.egnle,p,ne-.,
OU=Engmeer , 0=SE1
Eng —nng LLC, L=US Unified
She --="Jeff Rapped. P.E.'
July 29, 2021
Date
Seal

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
2
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
LD 1
LD 2
4
Type of SCM
NONE
NONE
5
Total drainage area sq ft
574,556
109,210
6
Onsite drainage area (sq ft)
574,556
109,210
7
Offsite drainage area (sq ft)
8
Total BUA in project (sq ft)
203 sf
2,795 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft)
I
10
New BUA not on subdivided lots (subject to
permitting) (sf)
203 sf
2,795 sf
11
Offsite BUA (sq ft)
12
Breakdown of new BUA not on subdivided lots:
- Parking (sq ft)
- Sidewalk sq ft
- Roof (sq ft)
216 sf
- Roadway sq ft
- Future (sq ft)
- Other, please specify in the comment box
below (sq ft)
203 sf
2,579 sf
13
New infiltrating permeable pavement on
subdivided lots (sq ft)
I
14
New infiltrating permeable pavement not on
subdivided lots (sq ft)
15
Existing 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
0%
3%
19
Design storm (inches)
20
Design volume of SCM (cu ft
21
Calculation method for design volume
ADDITIONAL INFORMATION
1.
22
Please use this space to provide any additional information about the
drainage area(s):
For BUA "other" this includes the racking post at 2.68 square inches per post
and concrete equipment pads.

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .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)
na
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
6
Are curb outlet swales proposed?
No
7
Maximum longitudinal slope of curb outlet swale(s) (% )
8
Bottom width of curb outlet swale(s) (feet)
9
Maximum side slope of curb outlet swale(s) (H:V)
10
Minimum length of curb outlet swale(s) (feet)
11
Are treatment swales used instead of curb outlet swales?
No
12
Is stormwater released at the edge of the setback as dispersed flow?
N/A
13
Have stormwater outlets been designed to prevent downslope erosion?
14
Are variations to rule .1003 proposed?
ADDITIONAL INFORMATION
15 1 Please use this space to provide any additional information about this low density project:
The project is low -density and will use vegetative meadow conditions to achieve site stablization, reduce velocities. The site has
been graded to reduce concentrated flows and encourage sheet flow of stormwater.
Swale
#
Drainage
Drainage
Area
ac
(ac)
Pervious
area
ac
C
Q
(Cfs)
Slope
N
Vanow
(fps)
V,«uai
(fps)
Flow depth
(ft)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28