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Home My WebLink About820427_SSE Calculations_20201029 Sludge Survey Evaluation Form Today's Date10/29/2020Today's Date10/29/2020 Facility # 820427820427 Owner: DK SpellDK Spell Lagoon ID12 Sludge Survey Received:9/23/20209/23/2020 Sludge Survey Performed:6/28/201912/30/2019 Sludge Depth (Row O): (ft) 3.52.9 Existing Treatment Depth (Row P): (ft) 4.704.60 Start Date:01/01/8801/01/88 Facility age at time of survey:(yr)3232 Average Sludge Accumulation (ft/yr):0.110.09 11 Requested Extension: (yr) Requested Due Date20212021 Sludge Accumulation during extension period: (ft)0.110.09 4.594.51 Treatment Depth Available after Extension: (ft) Sludge level OK?YESYES Ratio Estimates Based on DepthEXISTINGEXEMPTIONEXISTINGEXEMPTION Ratio of Sludge layer to total trmt depth 0.430.440.390.40 Ratio of Sludge depth OK?NOYES EXISTINGEXEMPTIONEXISTINGEXEMPTION Average Sludge layer thickness (T)3.53.612.92.99 Depth of the lagoon from top of bank to bottom soil surface (D) 10.110.110.110.1 Slope=Horizontal/vertical side slope (S) 3333 Length at the top of inside bank (L) 375375375375 Width at the top inside slope (W) 175175175175 Thickness of existing liquid treatment zone (Y) 4.704.594.604.51 Lm Length at midpoint of sludge layer ()=L-2S(D-(T/2)) 324.90325.23323.10323.37 Wm Width at midpoint of sludge layer ()=W-2S(D-(T/2)) 124.90125.23123.10123.37 Vs Volume of sludge ()=Lm*Wm*T 142030.04147079.21115343.47119308.93 Vsg Volume in gallons ()=Vs*7.481 1062526.691100152.49862884.49892430.76 Z Thickness of total treatment zone ()=T+Y 8.208.207.507.50 Lz Length at midpoint of total treatment zone ()=L-2(S)(D-(Z/2)) 339.00339.00336.90336.90 Wz Width at midpoint of total treatment zone ()=W-2(S)(D-(Z/2)) 139.00139.00136.90136.90 Vz Volume of total treatment zone ()=Lz*Wz*Z 386392.20386392.20345912.08345912.08 Ratio(R) of sludge layer volume to total trmt volume0.3680.3810.3330.345 Sludge Volume Ratio OK?YESYES Maximum extension until end of permit cycle Next survey to be done: (calendar yr) 12/31/2024######## Notification letter mailed: 4/12/20194/12/2019 10/29/2020 EXEMPTION EXEMPTION