740039_Sludge Survey (Other)_20240304

Ap6ndlx 1. Lagoon Sludge Survey Form
Revised August 2008
A. Farm Permit or DWQ Identification Number 74-39
B. Lagoon Identification High Ridge Farm
C. Person(s) Taking Measurements Colin Dykes
D. Date of Measurement 10/16/2023
E. Methods/Devices Used for Measurement of:
NCState University
A&T State University
COOPERATIVE
EXTENSION
EfflPowedffl
a. Distance from the lagoon liquid surface to the top of the sludge layer.
Weighted disk with cord and measuring tape attached
b. Distance from the lagoon liquid surface to the bottom (soil) of the lagoon.
PVC pipe with tape measure attached
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): 6.4 (acres)
(Draw a sketch of the lagoon on a separate sheet, list dimensions, and calculate surface area. The lagoon
may have been built dtfferent than designed, so measurements should be made.)
G. Estimate number of sampling points
a. Less than 1.33 acres: Use 8 points
b. If more than 1.33 ac. 6.4 acres x 6 = 24 , with maximum of 24.
(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). Also, at the
location of the pump intake, take measurements of distance from liquid surface to top of sludge
layer and record ft on the Data Sheet (last row); this must be at least 2.6 ft when irrigating.
I. At the time of the survey, also measure the distance from the Maximum Liquid Level to the Present Liquid
Level (measure at the lagoon gauge pole):
J. Determine the distance from the top of bank to the Maximum Liquid Level
(use lagoon management plan or other lagoon records)
K. Determine the distance from the Maximum Liquid to the Minimum Liquid level:
(use lagoon management plan or other lagoon records)
L Calculate the distance from the present liquid surface level to the Minimum Liquid Level
(Item K Minus Item I, assuming the present liquid level Is below the Maximum Liquid Level)
M. 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)
N. 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):
O. Record from the Sludge Survey Data Sheet the average thickness of the sludge layer.
P. Calculate the thickness of the existing Liquid Treatment Zone (Item N minus Item L):
MAR — 4 2024
Water Quality
Regional operations Seotlon
Washington Regional Office
3.5
1.9
4.1
0.6
7.5
3.4
4.1
2.8
Q. If Item O Is greater than item P, proceed to the Worksheet for Sludge Volume and Treatment Volume.
If Item O is equal to or less than Item P, you do not have to determine volumes.
Completed by: Colin Dykes
Print Name /Signature Date: 10/16/2023

Appendix 2. Sludge Survey Data Sheet* Revised August 2008
Lagoon Identification High Ridge Farm
Completed by: Colin Dykes z5Date: 10/16/2023
Print Name Signature
(A)
( B )
( C )
(C)-iB)
Grid Point
Distance from liquid surface
Distance from liquid surface
Thickness of sludge layer
No.
to to of stud a
to lagoon bottom (soil)
Ft & in.
Ft tenths
Ft & In.
Ft. tenths
Ft & in.
Ft tenths
1
3.3
7.3
4.0
2
3.4
7.7
4.3
3
3.4
7.8
4.2
4
3.5
7.8
4.3
5
3.3
7.2
3.9
6
3.5
7.8
4.3
7
3.4
7.4
4.0
8
3.7
7.2
3.5
9
3.1
7.1
4.0
10
3.6
7.6
4.0
11
3.3
7.6
4.3
12
3.8
7.5
3.7
13
2.8
7.0
4.2
14
3.4
7.5
4.1
15
3.6
7.8
4.2
16
2.8
7.3
4.5
17
3.3
7.6
4.3
18
3.4
8.1
4.7
19
3.7
7.5
3.8
20
3.3
7.2
3.9
21
3.4
7.8
4.4
22
3.6
7.9
4.3
23
3.5
7.6
4.1
4.2
points 24.0 X X 24.0 X X
24.0
X-
;readlngs
*pump
,�yyrrr
4.2X X X X X x
*All Grid Points and corresponding sludge layer thicknesses must be shown on a sketch attached to this
Sludge Surrey Data Sheet.

Appendix 3. Worksheet for sludge volume and treatment volume Revised August 2008
The average thlckness of the sludge layer and the thlckness of the existing liquid (sludge -free) treatment zone are determined
from the Information on the Lagoon Sludge Survey Form ( Items O and P, respectively). In this example, the average sludge
layer thickness is 2.5 feet and the existing liquid treatment zone is 3.5 feet If the lagoon has a designed sludge storage volume,
see notes at end of the worksheet. The dimensions of the lagoon as measured and the side slope are needed
for calculations of sludge volume and of total treatment volume. If the lagoon Is a standard geometric shape, the sludge
volume and the treatment volume in the lagoon can be estimated by using standard equations. For approximate volumes
of rectangular lagoons with constant side slope, calculate length and width at the midpoint of the layer, and multiply by layer
thickness to calculate layer volume, as shown in the example. For irregular shapes, convert the total surface area to a square
or rectangular shape. For exact volumes for lagoons with constant side slope, the "Prismoidal Equations" may be used.
I. Average sludge Layer Thickness m
Example
2.5
ft.
Your Lagoon
41
ft
2. Depth of the lagoon from top of bank to bottom soil surface (D)
11
ft.
12.9
ft.
3. Slope = Horizontal/ vertical side slope (S)
3
3.0
4. Length at the top of inside bank (L)
457
ft
9797
ft.
5. Width at top inside slope (W)
229
ft
254.7
ft.
6. Length at midpoint of sludge layer Lm = L-2S(D-(T/2))
398.5
ft.
914.5
ft.
7. Width at midpoint of sludge layer W,n W-23(D-(T/2))
170.5
ft
219.5
ft.
8. Volume of sludge (Vs) Vs=Lm Wm T
169,860
fty
816,428
W
9. Volume in gallons: Vsa=V'7.5 gal./ft3.
1,273,950
gal.
6,123,214
gal.
10. Thickness of existing liquid tmt. zone (Y)
3.5
ft
2.8
ft
11. Thickness of total treatment zone (Z) Z= T+Y
6 '
ft
6.9
ft
12. Length at midpoint of total tmt zone LZ = L-2(S)(D-(Z/2)
409
ft
923.0
ft.
13. Width at midpoint of total tmt Zone WZ = W-2(S)(D-(Z/2)
181
ft
228.0
ft
14. Volume of total treatment zone (Vz) Vz = LZWZZ
444,174
ft'
1,451,286
ft'
15. Ratio ( R ) of sludge layer volume to total Treatment Volume
R = Vs/Vz
0.38
0.56
If the ratio R exceeds 0.60, than a sludge Plan of Action may be required. Check with DWQ for Information
on filing the Plan of Action.
Note: If the lagoon has a designed sludge storage volume (DSSV), subtract that volume from both the volume
of sludge (Vs) (Item 8) and from the volume of total treatment zone (Vz) (Item 14), and take the ratio.
Then, R = (Vs-DSSV) / (Vz - DSSV)
Example: If DSSV = 85,000 ft3, then R = (169,860 - 85,000) / (447.174 - 85,000) = 84,860 / 362,174 = 0.24.
16. Design sludge storage volume (DSSV) 85,000
17. Ratio (R) of sludge layer volume to treatment volume adjusted
for designed sludge storage volume 0.24
0.56

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