090066_SSE Calculations_20201013

Sludge Survey Evaluation Form
Today's Date
10/7/2020
Facility #
9-66
Owner:
Coble Nursery
Lagoon ID
1
Sludge Survey Received:
9/23/2020
Sludge Survey Performed:
1/15/2019
Sludge Depth (Row O): (ft)
2.4
Existing Treatment Depth (Row P): (ft)
3.20
Start Date:
01/01/90
Facility age at time of survey:(yr)
29
Average Sludge Accumulation (ft/yr):
0.08
Requested Extension: (yr)
2
Requested Due Date
12/31/2022
Sludge Accumulation during extension period: (ft)
0.17
Treatment Depth Available after Extension: (ft)
3.03
NO
Sludge level OK?
Ratio Estimates Based on Depth
EXISTING
EXEMPTION
Ratio of Sludge layer to total trmt depth
0.43
0.46
NO
Ratio of Sludge depth OK?
EXISTING
EXEMPTION
Average Sludge layer thickness (T)
2.4
2.57
Depth of the lagoon from top of bank to bottom soil surface (D)
9.1
9.1
Slope=Horizontal/vertical side slope (S)
2.5
2.5
Length at the top of inside bank (L)
152
152
Width at the top inside slope (W)
151
151
Thickness of existing liquid treatment zone (Y)
3.20
3.03
Length at midpoint of sludge layer (Lm)=L-2S(D-(T/2))
112.50
112.91
Width at midpoint of sludge layer (Wm)=W-2S(D-(T/2))
111.50
111.91
Volume of sludge (Vs)=Lm*Wm*T
30105.00
32414.83
Volume in gallons (Vsg)=Vs*7.481
225215.51
242462.92
Thickness of total treatment zone (Z)=T+Y
5.60
5.60
Length at midpoint of total treatment zone (Lz)=L-2(S)(D-(Z
120.50
120.50
Width at midpoint of total treatment zone (Wz)=W-2(S)(D-(
119.50
119.50
Volume of total treatment zone (Vz)=Lz*Wz*Z
80638.60
80638.60
Ratio(R) of sludge layer volume to total trmt volume
0.373
0.402
Sludge Volume Ratio OK?
NO
Maximum extension until end of permit cycle
Next survey to be done: (calendar yr)
12/31/2016

Notification letter mailed: 1/15/2015