410016_Sludge Survey (Reporting)_20221130

Appendix 1. Lagoon Sludge Survey Form Revised August 2008
A. Farm Permit or DWQ Identification Number_________________________________
B. Lagoon Identification ___________________________________________________
C. Person(s) Taking Measurements ___________________________________________
D. Date of Measurements __________________________________________________
E. Methods/Devices Used for Measurement of:
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. The lagoon may
have been built different 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 acres, ______ acres x 6 = _______, 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 measurement of distance from liquid surface to top of sludge layer and record it
on the Data Sheet (last row); this must be at least 2.5 ft. when irrigating.
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): ________
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 Level 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): _________
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: _______________________ _________________________Date:_____________
Print Name Signature
AWS410016
Upper Lagoon
Michael Shepherd
12/2/2021
PVC Pole
PVC Pole
PVC Pole
0.35
0.6
1.675
2.2
1.6
9.6
7.2
2.5
5.6
Michael Shepherd 12/2/2021
Appendix 2. Sludge Survey Data Sheet* Revised August 2008
Lagoon Identification: _______________________________________________________
Completed by: ___________________ _______________________ Date:_____________
Print Name Signature
(A)
Grid
Point
No.
(B)
Distance from liquid
surface to top of sludge
(C)
Distance from liquid surface
to lagoon bottom (soil)
(C) minus (B)
Thickness of sludge layer
Ft. & in. Ft.(tenths) Ft. & in. Ft. (tenths) Ft. & in. Ft. (tenths)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Number of points with
readings X X
Average
of
points
At
pump
intake
X X X X
*All Grid Points and corresponding sludge layer thicknesses must be shown on a sketch attached
to this Sludge Survey Data Sheet. See Appendix 4 for conversion from inches to tenths of a foot.
Upper Lagoon
Michael Shepherd 12/2/2021
6 0
5 4
6 75
8 0
8 75
7 0
7 75
7 6
9 4
7 8
8 8
11 0
11 0
9 0
10 0
10 0
3 4
2 4
2 05
3 0
2 25
2 0
2 25
2 4
8 8 8
7 2 9 6 2 5
Appendix 3. Worksheet for sludge volume and treatment volume Revised August 2008
The average thickness of the sludge layer and the thickness of the existing liquid (sludge-free) treatment
zone (are determined from 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
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.
Example Your lagoon
1. Average Sludge Layer Thickness (T) 2.5 ft. ____________
2. Depth of lagoon from top of bank
to bottom soil surface (D)11 ft. ____________
3. Slope = horizontal/vertical side slope (S) 3 ____________
4. Length at top inside bank (L)457 ft. ____________
5. Width at top inside bank (W)229 ft. ____________
6. Length at midpoint of sludge layer
Lm = L – 2 S (D- (T/2))398.5 ft. ____________
7. Width at midpoint of sludge layer
Wm = W – 2 S (D – (T/2))170.5 ft. ____________
8. Volume of sludge (Vs):
Vs = Lm Wm T 169,860 ft3 ____________
9. Volume in gallons:
Vsg =V * 7.5 gal./ft3.1,273,950 gal. ____________
10. Thickness of existing liquid tmt. Zone (Y) _3.5 ft.______ ____________
11. Thickness of total treatment zone (Z) ___ 6.0 ft. ___________
Z = T + Y
(Appendix 3 continued on next page)
2.5
12
2
177
93
134
50
16,750
125,625
5.6
8.1
Revised August 2008
Appendix 3. Worksheet for sludge volume and treatment volume (continued)
12. Length at midpoint of total tmt. zone ____409 ft.___ ___________
Lz = L – 2(S) (D – (Z/2)
13. Width at midpoint of total tmt. zone ____181 ft.___ ___________
Wz = W – 2(S) (D – (Z/2)
14. Volume of total treatment zone (Vz) __444,174 ft3__ ___________
Vz = Lz Wz Z
15. Ratio (R) of sludge layer volume to total
Treatment volume
R = Vs/Vz _____0.38____ ____________
If the ratio exceeds 0.50, 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:
R = (Vs – DSSV) / (Vz – DSSV)
Example: If DSSV = 85,000 ft3, then R = (169,860 – 85,000) / (444,174 – 85,000)
R = 84,860 / 359,174 = 0.24
Appendix 4. Conversion table from inches to tenths of a foot.
Inches Tenths of
foot
Inches Tenths of
foot
1 0.1 7 0.6
2 0.2 8 0.7
3 0.2 9 0.7
4 0.3 10 0.8
5 0.4 11 0.9
6 0.5
145.2
61.2
71,979
0.23
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Bruce Humble AWS410016 Upper Lagoon Sludge Survey Map
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