310350_Report_20211209 (2)

Appendix 1. Lagoon Sludge Survey Form
A. Farm Permit or DWQ Identification Number:
B. Lagoon Identification:
C. Person taking Measurements:
D. Date of Measurement:
E. Methods/Devices Used for Measurement of:
31-350
Sam Edwards
12/9/2021
Start Pump
Stop Pump
Freeboard
a. Distance from the lagoon liquid surface to the top of the sludge layer:
b. Distance from the lagoon liquid surface to the bottom (soil) of the lagoon:
c. Thickness of the sludge layer if making a direct measurement with "core sampler":
F. Lagoon Surface Area (using dimensions at inside top of bank): acres
(Draw a sketch of the lagoon on a separate sheet, list dimensions, and calculate surface area.)
G. Estimate number of sampling points:
a. Less than 1.33 acres: Use 8 points
b. If more than 1.33 acres, acres x 6 = 0 , with maximum of 24.
19.8
44
21
Sludge Boat
Sludge Boat
Sludge Boat
(Using sketch and dimensions, develop a uniform grid that has the same number of intersections as the
estimated number of sampling points needed. Number the intersection points on the lagoon grid so that data
recorded at each can be easily matched.)
H. Conduct sludge survey and record data on "Sludge Survey Data Sheet" (Appendix 2).
I. At the time of the sludge survey, also measure the distance from the Maximum Liquid Level
to the Present Liquid Level (measure at the lagoon gauge pole): 0.1
J. Determine the distance from the Maximum Liquid Level to the Minimum Liquid Level
(use lagoon management plan or other lagoon records): 2.1
K. Calculate the distance from the present liquid surface level to the Minimum Liquid Level
(Item J minus Item I, assuming the present liquid level is below the Maximum Liquid Level): 2.0
L. Record from the Sludge Survey Data Sheet the distance from the present liquid surface level
to the lagoon bottom (average for all the measurement points): 9.3
M. Record from the Sludge Survey Data Sheet the distance from the present liquid surface level
to the top of the sludge layer (average for all the measurement points): 5.5
N. Record from the Sludge Survey Data Sheet the average thickness of the sludge layer: 3.8
O. Calculate the thickness of the existing Liquid Treatment Zone (Item M minus Item K):
(Note: If Item 0 is less than 4 feet, a sludge remaval and utilization plan may be required by
N.C. DWQ. See your specific permit or contact DWQ for more information.)
P. Proceed to the Sludge Volume Worksheet if you desire to calculate sludge volume for a rectangular -
shaped lagoon with uniform side slopes.
Completed by: Sam Edwards
Print Name
3.5
12/9/2021
Signature Date

Appendix 3. Sludge Volume Worksheet
Lagoon Identification: 31-350 Date: 12/9/2021
Completed by:
Sam Edwards c5C6442
Print Name Signature
1 Average Sludge Layer Thickness (T) 3.8
2 Depth of lagoon from top of bank to
bottom soil surface (D) 11
3 Slope = horizontal/vertical side slope (S) 3
4 Length at top inside bank (L) 300
5 Width at top inside bank (W) 145
6 Length at midpoint of sludge layer
Lm = L - 2 S (D - (T/2)) 245.4
7 Width at midpoint of sludge layer
Wm = W - 2 S (D - (T/2)) 90.4
8 Volume of sludge (V)
Vs = Lm x Wm x T 84,300
9 Volume in gallons
Vg = V x 7.5 gal./ft3. 632,249
10 Thickness of existing liquid tmt. Zone (Y)
3.5
11 Thickness of total treatment zone (Z)
Z=T+Y 7.3
12 Length at midpoint of total tmt. Zone
Lz = L-2(S)(D - (Z/2) 256
13 Width at midpoint of total tmt.zone
Wz = W-2(S)(D - (Z/2) 101
14 Volume of total treatment zone (Vz)
Vz = Lz Wz Z 188,488
15 Ratio ( R ) of sludge layer volume to total
R=Vs/Vz 0.45