820081_SSE Calculations_20201027

Sludge Survey Evaluation Form
Today's Date10/27/2020
Facility #
820081
Owner:
Lafayette L-12
Lagoon ID2
Sludge Survey Received:9/23/2020
Sludge Survey Performed:1/20/2019
Sludge Depth (Row O): (ft)
3.6
Existing Treatment Depth (Row P): (ft)
6.70
Start Date:01/01/77
Facility age at time of survey:(yr)42
Average Sludge Accumulation (ft/yr):0.09
5
Requested Extension: (yr)
Requested Due Date2025
Sludge Accumulation during extension period: (ft)0.43
6.27
Treatment Depth Available after Extension: (ft)
Sludge level OK?YES
Ratio Estimates Based on DepthEXISTINGEXEMPTION
Ratio of Sludge layer to total trmt depth
0.350.39
Ratio of Sludge depth OK?YES
EXISTINGEXEMPTION
Average Sludge layer thickness (T)3.64.03
Depth of the lagoon from top of bank to bottom soil surface (D)
10.110.1
Slope=Horizontal/vertical side slope (S)
33
Length at the top of inside bank (L)
375375
Width at the top inside slope (W)
175175
Thickness of existing liquid treatment zone (Y)
6.706.27
Lm
Length at midpoint of sludge layer ()=L-2S(D-(T/2))
325.20326.48
Wm
Width at midpoint of sludge layer ()=W-2S(D-(T/2))
125.20126.48
Vs
Volume of sludge ()=Lm*Wm*T
146574.14166325.15
Vsg
Volume in gallons ()=Vs*7.481
1096521.171244112.11
Z
Thickness of total treatment zone ()=T+Y
10.3010.30
Lz
Length at midpoint of total treatment zone ()=L-2(S)(D-(Z/2))
345.30345.30
Wz
Width at midpoint of total treatment zone ()=W-2(S)(D-(Z/2))
145.30145.30
Vz
Volume of total treatment zone ()=Lz*Wz*Z
516772.53516772.53
Ratio(R) of sludge layer volume to total trmt volume0.2840.322
Sludge Volume Ratio OK?YES
Maximum extension until end of permit cycle
Next survey to be done: (calendar yr)
12/31/2024
Notification letter mailed:
4/12/2019