SW5190702_SCM Supplemental Form_7/12/2019

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
FORMS LOADED
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 hest 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.
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DRAINAGE AREAS
1
Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs
2 SCMs
1 3
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
1
2
4
Type of SCM
Sand Filter
Sand Filter
5
Total BUA in project (sq ft
267420 sf
107956 sf
148392 sf
6permitting)
New BUA on subdivided lots (subject to
s ft
7permitting)
New BUA outside of subdivided lots (subject to
sf
267420 sf
107956 sf
148392 sf
8
JOffsite - total area (sq ft
9
Offsite BUA (sq ft
10
Breakdown of new BUA outside subdivided lots:
Parking (sq ft
108359 sf
40447 sf
58635 sf
Sidewalk (sq ft
41416 sf
18864 sf
20757 sf
Roof (sq ft
117645 sf
48645 sf
69000 sf
Roadway s ft
Future (sq ft
Other, please specify in the comment box
below (sq ft
11
New infiltrating permeable pavement on
subdivided lots (sq ft
12
New infiltrating permeable pavement outside of
isubdivided lots (sq ft
13permitting)
Exisitng BUA that will remain (not subject to
s ft
14
Existing BUA that is already permitted (sq ft
15
Existing BUA that will be removed (sq ft
16
Percent BUA
33%
60%
63%
17
Design storm inches
1 in
1 in
1 in
18
1 Design volume of SCM cu ft
6635 cf
9093 cf
19
lCalculation method for design volume
Simple
Simple
Simple
DDITIONAL INFORMATION
20
Please use this space to provide any additional information about the
drainage area(s):
The site was analyzed at one point of discharge and there are two sub -
basins, one for each SCM.

SAND FILTER
18
SHWT elevation (fmsl)
N/A
N/A
19
Type of sand filter (open or closed)
Closed
Closed
20
If closed, will the filter will be pre -cast or pour -in -place?
Pre Cast
Pre Cast
21
If closed, top of grate elevation (fmsl)
436.5
435.6
22
Is this sand filter designed to attenuate peak flows?
No
No
Sediment Chamber
23
Volume that can be retained in the sediment chamber (cubic feet)
3360 cf
4725 cf
24
Will there be a permanent pool in the sediment chamber?
Yes
Yes
25
Bottom of the sediment chamber (fmsl)
428.00
426.10
26
Area of the sediment chamber (square feet)
840 sf
945 sf
27
Physical depth of the sediment chamber (inches)
96 in
108 in
28
Ponding depth in the sediment chamber, above any permanent pool
(inches)
63 in
75 in
29
Elevation of top of weir between chambers (fmsl)
430.75
428.85
Sand Chamber
30
Volume that can be retained in the sand chamber (cubic feet)
Bottom of the sand chamber (fmsl)
3360 cf
4725 cf
31
428.00
426.10
32
Area of the sand chamber (square feet)
840 sf
945 sf
33
Physical depth of the sand chamber (inches)
18 in
18 in
34
Ponding depth in the sand chamber, above any permanent pool
(inches)
48 in
60 in
35
Elevation of the bypass device (fmsl)
434.75
433.85
36
Type of bypass device
Weir
Weir
37
Mechanism for distributing flow over the sand surface
38
Sand specification for sand chamber
ASTM C33
ASTM C33
39
Depth above underdrain pipe (inches)
25 in
25 in
Will the media be maintained to drain at least two inches per hour at
thesandsurface?
Yes
Yes
L14
Is at least one clean -out pipe provided at the low point of each
underdrain line?
Yes
Yes
Will clean -out pipes be capped?
Yes
Yes
Sand Filter 1 5:31 PM 7/9/2019