HomeMy WebLinkAboutSP-22-032 - Supplemental - 0119 Tilley Drive (46)Version: 11/30/2020 Project Name:
Discharge Point:
Treatment Wetland #
Practice Drainage Area
For Permit
Coverage
Not for Permit
Coverage
Total to
Practice
1 Total Area (acres)4.540 0.000 4.540
2 2.780 0.000 2.780
3 0.000 0.111 0.111
WQV for
credit
WQV not for
credit
Total
WQV
4 WQV to practice 0.2274 0.0000 0.2274 96
5 2
6 2
Response Attachment location
7 Plans - C1.3 & C-4.6
8 Plans - C1.3 & C-4.6
9 Plans - C1.3 & C-4.7
10 Plans - C-4.6
11*Plans - C-1.3
12*Plans - C-4.6
13*Plans - C-4.6
Response Attachment location
14 Plans - C-1.3
Has a low for orifice been provided to meet the the WQV and CPV extended
Has a liner designed in accordance with Section 4.3.5.2 been provided if the
infiltration rate exceed 0.05 inches per hour and the wetland is located above
New Impervious (acres)
UVM MC Outpatient Surgery
SN001
Gravel Wetland #1Treatment Wetlands (4.3.5)
Redeveloped Impervious
Pre-Treatment (4.3.6.3)
Has pretreatment been provided for non-rooftop runoff?
Discharges to Cold or
Warm Water Fishery?
Modified CN for WQ
(1.0") storm
Note: Designers may use the Practice Drainage Area Runoff Calculator (second tab) for calculation of practice-
specific runoff volumes for other treatment standards.
Conveyance (4.3.5.2)
Are inlets stabilized to ensure that non-erosive conditions exist for at least the
1-year, 24 hour storm?
* Questions preceded by an asterix (*) may change based on previously entered values
Have inlet pipes been set at the permanent pool or the base of the gravel bed?
↑Enter this value on the Standards
Compliance Workbook
Is outlet elevation designed such that a sub-surface water level is maintained
in the gravel wetland?
If the gravel wetland is designed with an organic soil layer at the surface, have
vertical perforated riser pipes been provided to deliver stormwater
stormwater from the surface down to the gravel bed?
Have the outfalls and the conveyance to the discharge point been designed
and protected to avoid erosion?
Practice Type
Yes No
Yes No
No
No
Yes
Yes
NoYes
Cold
Warm
NoYes
NoYes
NoYes
Shallow surface wetland
Gravel wetland
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15
Response Attachment location
16 ft3 2565 Attachment Modeling
17 ft3 6780 Attachment Modeling
18 ft3 9345
19*
20*
21 94.3%Yes
22 Modeling
23
24
ac-ft 0.471 Enter this on the eNOI
Response Attachment location
25 N/A
26 N/A
27 Plans - C-4.6
28 N/A
29 Plans - C-4.6
30
Does the planting plan specify that no woody vegetation >2 inches in diameter
shall be planted or allowed to grow on the dam, within 15 feet of the dam or
the toe of the embankment, or within 25 of a principal spillway outlet?
What type of pretreatment is being
used?
Has an aquatic been been provided that extends at least 5 feet inward from the
normal water edge and is no more than 18 inches deep?
Has a setback been provided that extends 25 feet from the maximum design
water surface elevation of the practice?
What is the Storage Volume of the practice. Include the permanent
pool and any volume used for providing extended detention.
Are all deep pool areas of ≥ 4 feet depth with side slopes steeper than 4:1 (H:V)
surrounded by a safety bench with ≤6% slope extending 10 feet outward from
the normal water edge to the toe of the side slope?
Landscaping (4.3.6.5)
Treatment (4.3.6.4)
Has a minimum flow path at normal water level of 3:1 been provided?
Attachment location: Indicate the specific location (i.e. appendix, page, plan sheet) where the requisite support documentation has
been provided within the application.
What is the volume stored in the forebay or other volumetric pre-
treatment if used? (minimum 10% WQV)
What is the volume stored in the permanent pool?
What is the total WQV stored at the normal water level (pre-
treatment + permanent pool)?
Does the pre-treatment volume plus the permanent pool equal at least 50% of
the WQV?
Has a planting plan been prepared showing how aquatic and terrestrial areas
will be stabilized, including plant species, plant locations, sources of plant
material and any required soil amendments?
Are any donor organic soils used in the practice obtained from a source other
than natural wetlands?
Is the remaining WQV provided for by extended detention over 24 hours?
Swale
Filter Strip
Forebay (10% WQv)
Deep Sump Catch Basins
Proprietary
NoYes
NoYes
NoYes
Yes No
NoYes
NoYes
NoYes
NoYes
NoYes
NoYes
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