310162_Response to Certified Letter - Lagoon Sampling with reports_20180618

Charles W. Edwards, Jr.
Glade Ridge Farm RECEIVEDINCDENR/M
605 Fountaintown Road
Beulaville, NC 28518 JUN 18 2018
June 14, 2018 Water Quality Regional
Operations Section
NC Water Resources Wilmington Regional Office
Environmental Quality
Attention: Jim Gregson
127 Cardinal Drive Extension
Wilmington, NC28405
SUBJECT: Lagoon Sampling —April 13,2018
Glade Ridge
Permit # AWS310162
Duplin County
Dear Mr. Gregson:
Enclosed please find the information that DWQ requested of me in a letter dated May 21, 2018. This
includes: two years of sludge surveys done by Curtis Barwick. Mr. Barwick has done my sludge surveys
for many years now. There was no sludge removal performed between March 17 and April 14, 2018. 1
am not sure why your samples, taken on April 13, 2018, spiked up as high as they did, but I suspect that
they were taken too close to the edge of the lagoon water and at 12" deep which 1s too close to the
sludge blanket or even In it. These samples need to be taken from 8 to 10 feet from the water's edge
and not that distance from the lagoon bank. I have also enclosed a copy of the results of a recent
sample dated 6-1-2018. There have been more samples taken but not available by my new waste
management consultant, Mr. Curtis Barwick of Barwick Ag Consultants. Should you require these
samples, I will be happy to forward those to you.
Sincerely,
Charles W. Edwards, Jr.
Owner, Glade Ridge Farm

NCDABCS Agronomic Division Phone: [phone] Website: www.ncagr.gov/agronomi/ IReport
No. FY18-WO07292
Predictive Client: Charles (Jr)/Justin Edwards
507 Cedar Fork Church Rd.
Advisor.
Sli /es were
sib
-
C �""f
i Beulaville, NC 28518
Waste Report Duplin County
y-ak�w
by
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Anwa
1
�,an• Links to Helpful Information Received: Sampled: 06/01/2018
O6/04/2018
Farm: 31162
Completed: 06/11/2018 PALS M 137064
PALS #:
Sample Information
Nutrient Measurements are given In units of parts per million (ppm), unless utherwrse
Nitrogen (N) P K Ca Mg S Fe Mn Zn
specifed.
Cu B
Other Results
Mo C At Na Cl
ID: GIRL
Code:ALS
Total N: 33.9 865 112 74.3 44.8 2.84 0.40 1.13
1.05 1.00
- - 0.40 249 -
Descrlptlon: Swine
Total KJeldahl N: 733
- - - - - - - - - - - - -- - - -
- - - -
- - - - - - - -
Lagoon Llq.
Inorganic:
GrowerComments:
NH4-N SS EC pH BD CCE
ALE
C:N DM -
Not Provided
NO3-N (Ie S/cm) (mS/cm) (Unitless) (lb/yd3) (%)
(1000 gal)
(Undless) (%)
- - 7.48 - -
-
- -
Estimate of Nutrients Available for First Year (Ib/1000 gal)
Other Results ob/1000 gal)
Application Method:
N P205 K20 Ca Mg S Fe Mn Zn
Cu B
Mo AI Na Cl
Irrigation
3.06 0.65 8.66 0.94 0.62 0.37 0.02 T 0.01
0.01 0.01
- T 2.08 -
Agronomist's Comments: Hunter G. Landis 6/8/2018 1:41 PM
Sample Information
Nutrient Measurements are given in units of parts per million (ppm), unless utherMse
Nitrogen (N) P K Ca Mg S Fe Mn Zn
specifed.
Cu B
Other Results
Mo C AI Na Cl
ID: GRB
Code: ALS
Total N: 25.2 589 81.0 49.3 25.0 2.94 0.31 1.23
1.06 0.74
- - 0.44 175 -
Description: Swine
Total KJeldahl N: 484
- - - - - - - - - - - - - - - - -
- - - -
- - - - -
Lagoon Liq.
Inorganic:
Grower Comments:
NH4-N SS EC pH BD CCE
ALE
C:N DM
Not Provided
NO3-N (Ie S/cm) (mS/cm) (Unitless) (lb/yd3) (%)
(1000 gal)
(Umtless) (%)
- - 7.68 - -
-
- -
Estimate of Nutrients Available for First Year (lb/1000 gal)
Other Results ob/1000 gal)
Application Method:
N P205 K20 Ca Mg S Fe Mn Zn
CU B
Mo AI Na Cl
Irrigation
2.02 0.48 5.90 0.68 0.41 0.21 0.02 T 0.01
0.01 0.01
- T 1.46 -
North Carolina
Tobacco That Rind Comm lm
Reprogramming of the laboratory -Information -management system that makes this report possible Is being funded
through a grant from the North Carolina Tobacco Trust Fund Commission.
Thank you for using agronomic services to manage nutrients and safeguard environmental quality.
- Steve Troxler, Commissioner ofAgrictdture.

ti BARWICK AG SERVICES, LLC CLINTON, NC 910-385-1000
Appendix 1. Lagoon Sludge Survey Form
A Farm Period or DWQ Identification Number Glade Ridge Farm 31-162
B Lagoon Identrfication 1 small
C. Person(s) Taking Measurements Curtis Barwick
D. Date of Measurement 11/16/2016
E. Methods/Devices Used for Measurement of.
a. Distance from the lagoon liquid surface to the top of the sludge layer
remote control boat w/ deoth sonar
b Distance from the lagoon liquid surface to the bottom (soil) of the lagoon
pvc pipe
c. Thickness of the sludge layer if making a direct measurement with "core sampler"
Lagoon Surface Area (using dimensions at inside top of bank): 1.63 (acres)
(Draw a sketch of the lagoon on a separate sheet, list dimensions, and calculate surface area. The lagoon
may have been bulk different than designed, so measurements should be made.)
G Estimate number of sampling points,
a. Less than 1.33 acres Use 8 points
1724 points messued
b. If more than 1.33 ac. acres x 6 = , with maximum of 24.
(Using sketch and dimensions, develop a undone 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 matdied )
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 it on the Data Sheet Vast 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
Vtem K Minus hem 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 Workshest for Sludge Volume and Treatment Volume.
If Item O Is equal to or less than hem P, you do not hayg to detegnine volumes.
1.3
1.8
1.9
06
9.2
50
42
4.4
0, ` 4.5 at pump intake
Completed by. Curtis Bannock o rivv�n.J�- Date: 11/15/2016

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 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 existmg 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 "Prismoldal Equations" may be used.
1. Average sludge Layer Thickness M
2. Depth of the lagoon from top of bank to bottom soli surface (D)
3. Slope = HonzontsU vertical side slope (S)
4. Length at the top of inside bank (L)
5. Width at top Inside slope (W)
B. Length at midpoint of sludge layer Lm = L-2S(D-(T/2))
7. Width at midpoint of sludge layer Wm W-2S(D-(T/2))
8 Volume of sludge (Vs) Vs=Lm%T
9 Volume in gallons: Vse=V"7.5 gal /tt3.
10. Thickness of existing liquid tmt zone (Y)
11. Thickness of total treatment zone (Z) Z= T+Y
12. Length at midpoint of total tmt zone L. L-2(8)(D-(Z/2)
13. Width at midpoint of total tmt Zone W. = W-2(S)(D-CM)
14. Volume of total treatment zone (Vz) Vz = L� WIZ
Example
Your Lagoon
2.5
ft.
4.2
ft
11
ft
12.1
ft
3
3.0
457
ft.
308.0
ft.
229
ft.
231.0
ft
398.5
it
248.1
ft
170.5
It.
171.1
ft
169.860
ft'
178,325
ft
1,273,950
gal.
1.337,436
gal.
3.5
ft
4.4
it
6
it
8.6
it
409
ft.
261.3
ft
181
it
184.3
ft.
444,174
ft"
414,232
fl
15. Ratio ( R ) of sludge layer volume to total Treatment Volume
R = VsNz 0.38 0.43
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,DOO ft3, then R = (169,860 - 85,000) / (447,174 - 85,000) = 84,860 / 362.174 = 0 24.
16. Design sludge storage volume (DSSV) 85,OD0
17. Ratio (R) of sludge layer volume to treatment volume adjusted
for designed sludge storage volume 024 0.43

BARWICK AG SERVICES, LLC CLINTON, NC 910-385-1000
Appendix 1. Lagoon Sludge Survey Form
A Farm Permit or DWQ Identification Number Glade Ridge Farm 31-162
B Lagoon Identification Big
C. Person(s) Taking Measurements Curtis Barwick
D Date of Measurement 11/15/2016
E Methods/Devices Used for Measurement of
a. Distance from the lagoon liquid surface to the top of the sludge layer
remote control boat w/ deoth sonar
b Distance from the lagoon liquid surface to the bottom (soil) of the lagoon
Pvc Pipe
c Thickness of the sludge layer if making a direct measurement with "core sampler"
Lagoon Surface Area (using dimensions at Inside top of bank): 2 (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
2,814 points measued
b. If more than 1.33 ac 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 pomis on the lagoon gnd 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 it on the Data Sheet (last row); this must be at least 2.5 ft. when Irrigating.
1. 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). 0.3
J Determine the distance from the top of bank to the Maximum Liquid Level 16
(use lagoon management plan or other lagoon records)
K Determine the distance from the Maximum Liquid to the Minimum Liquid level- 22
(use lagoon management plan or other lagoon records)
L Calculate the distance from the present liquid surface level to the Minimum Liquid Level 1.9
(Item K Minus Item 1, assuming the present liquid level is below the Maximum Liquid Levu
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) 12.0
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): 74
O. Record from the Sludge Survey Data Sheet the average thickness of the sludge layer. 4.6
P. Calculate the thickness of the existing Liquid Treatment Zone (Item N minus Item L): 5.5
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 havejgdetennipe volumes.
Completed by.
Print Name /Signature
6.9 at pump intake
Date. 11/152016

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 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 it 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 "Pdsmoldal Equations" may be used.
1. Average sludge Layer Thickness m
2. Depth of the lagoon from top of bank to bottom soil surface (D)
3. Slope = Horizontal/ vertical side slope (S)
4. Length at the top of inside bank (L)
5 Width at tap inside slope (W)
6. Length at midpoint of sludge layer Lm= L-2S(D-(T/2))
7. Width at midpoint of sludge layer Wm W-2S(D-(T/2))
8. Volume of sludge (Vs) Vs=L,,, Wm T
9. Volume in gallons: Vse=V'7.5 galJW.
10. Thickness of existing liquid tmt zone (Y)
11. Thickness of total treatment zone (Z) Z= T+Y
12. Length at midpoint of total tmt zone L. L-2(S)(D-(Z/2)
13. Width at midpoint of total tmt Zone W. = W-2(S)(D-(Z2)
14. Volume of total treatment zone (Vz) Vz = L, WzZ
Example
Your Lagoon
2.5
ft.
4.6
it
11
ft
13.9
ft
3
3.0
457
ft
330.0
ft
229
fL
265.0
fL
398.5
ft
260.5
R
170.5
ft
195.5
ft
169,860
fl
234,310
ft'
1,273,950
gal.
1,757,322
gal.
3.5
ft
5.5
ft
6
ft
10.1
ft
409
ft
277.0
R
181
fL
212.0
ft
444.174
fl'
593,211
ft'
16. Ratio ( R ) of sludge layer volume to total Treatment Volume
R = Vs/Vz 038 0.39
If the ratio R exceeds 0.60, than a sludge Plan of Action may be requlred. 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 fta, 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
0.39

- BARWICK AG SERVICES, LLC CLINTON, NC 910-385-1000
Appendix 1. Lagoon Sludge Survey Form
A Farm Permit or DWQ Identification Number Glade Ridqe Farm 31-162
B. Lagoon identification 1 small
C. Person(s) Taking Measurements Curtis Barwick
D. Date of Measurement 11/29/2017
E. Methods/Devices Used for Measurement of:
a. Distance from the lagoon liquid surface to the top of the sludge layer.
remote control boat w/ death sonar
from the lagoon liquid surface to the bottom (solo of the lagoon
pvc pipe
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), 1.63 (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 ac
1739 points measued
acres x 6 = with maiamum 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 it on the Data Sheet (last row); this must be at least 2.5 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), 15
J. Determine the distance from the top of bank to the Maximum Liquid Level 16
(use lagoon management plan or other lagoon records)
K Determine the distance from the Maximum Liquid to the Minimum Liquid level, 19
(use lagoon management plan or other lagoon records)
L Calculate the distance from the present liquid surface level to the Minimum Liquid Level 0.4
(Item K Minus Item I, assuming the present liquid level Is below the Maximum Liquid Levu
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) 90
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): 73
O. Record from the Sludge Surrey Data Sheet the average thickness of the sludge layer. 1.7
P. Calculate the thickness of the existing Liquid Treatment Zone (Item N minus Item L): 69
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_)3pve to determine voNmes.
Completed by.
Print Name
7 at pump intake
Date: 11/29/2017

'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 the information on the Lagoon Sludge Survey Form ( Items 0 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 "Prismoidai Equations" may be used.
1. Average sludge Layer Thickness (T)
2. Depth of the lagoon from top of bank to bottom soil surface (D)
3. Slope = Horizontal/ vertical side slope (S)
4. Length at the top of inside bank (L)
5. Width at top inside slope (W)
6. Length at midpoint of sludge layer L,,,= L-2S(D-(T/2))
7. Width at midpoint of sludge layer Wm W-2S(D-(T/2))
8. Volume of sludge (Vs) Vs=Lm Wm T
9. Volume In gallons: Vsa V'7.5 galJft'.
10. Thickness of existing liquid tmt zone (Y)
11. Thickness of total treatment zone (Z) Z= T+Y
12. Length at midpoint of total tmt zone L.= L-2(S)(D-(Z/2)
13. Width at midpoint of total trot Zone Wz = W-2(S)(D-(Z/2)
14. Volume of total treatment zone (Vz) Vz = 4 WIZ
Example Your Lagoon
25 ft. 1.7 fL
11 ft 121 It
3 3.0
457 ft. 308.0 ft
229 fL
3986 ft
231.0 R
240.6 R
170.5
R
1636
ft
169,860
ft"
66,929
fl
1,273,950
gal.
501,971
gal
3.5
ft
6.9
it
6
ft
8.6
It
409
fL
261.3
fL
181
it
184.3
ft.
444,174
ft3
414,232
ft3
15. Ratio ( R ) of sludge layer volume to total Treatment Volume
R = VsA(z 0.38 016
H the ratio R 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.
Then, R = (Vs-DSSV) / (Vz - DSSV)
Example: If DSSV = 85,000 ft?, then R = (169.860 - 85,000) / (447,174 - 85,000) = 84,860 / 362,174 = 024.
16. Design sludge storage volume (DSSV) 85.000
17. Ratio (R) of sludge layer volume to treatment volume adjusted
for designed sludge storage volume 024 0.16

. BARWICKAG SERVICES, LLC CLINTON, NC 910386-1000
Appendix 1. Lagoon Sludge Survey Forth
A Farm Permit or DWQ Identification Number Glade Ridge Farm 31-162
B. Lagoon Identification Big
C Person(s) Taking Measurements Curtis Barwick
D. Date of Measurement 11/29/2017
E Methods/Devices Used for Measurement of.
a. Distance from the lagoon liquid surface to the top of the sludge layer
remote control boat w/ depth sonar
b. Distance from the lagoon liquid surface to the bottom (soil) of the lagoon.
Dvc DIDe
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): 2 (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 2,776 points measurd
b If more than 1.33 ac. acres x 6 = with maximum of 24.
(Using sketch and dimensions, develop a uniform gnd that has the same number of intersections as the
estimated number of sampring 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 It on the Data Sheet (last row); this must be at least 2.5 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). 1.4
J. Determine the distance from the top of bank to the Maximum Liquid Level 1.6
(use lagoon management plan or other lagoon records)
K Determine the distance from the Maximum Liquid to the Minimum Liquid level: 2.2
(use lagoon management plan or other lagoon records)
L Calculate the distance from the present liquid surface level to the Minimum Liquid Level 0.8
(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) 10.9
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): 6.0
O. Record from the Sludge Survey Data Sheet the average thickness of the sludge layer. 4.9
P. Calculate the thickness of the existing Llquld Treatment Zone (Item N minus Item L), 5.2
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.
5.4 at pump intake
Completed by. Curbs Barwick , �� Date: 11r2g=17
Print Name /Sionatur

ippenduk 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 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 "Pdsmoldal Equations" may be used.
Example
Your Lagoon
1. Average sludge Layer Thickness M
2.5
ft
4.9
ft
2 Depth of the lagoon from top of bank to bottom soil surface (D)
11
ft
13.9
ft
3 Slope = Horizontal/ vertical side slope (S)
3
3.0
4 Length at the top of inside bank (L)
457
ft
330.0
it
5 Width at top Inside slope (W)
229
ft
265.0
ft
6 Length at midpoint of sludge layer Lm = L-2S(D-(T/2))
398.5
ft
261.4
it
7. Width at midpoint of sludge layer Wm W-2S(D-(T/2))
170.5
it
196.4
ft
8. Volume of sludge (Vs) Vs=Lm Wm T
169,860
ft'
251,606
ft
9. Volume in gallons: Vs9=V'7.5 galdi6.
1.273.950
gal.
1,887,043
gal.
10. Thickness of existing liquid tmt. zone m
3.5
it
5.2
It
11. Thickness of total treatment zone (Z) Z= T+Y
6
ft
10.1
ft
12. Length at midpoint of total tmt zone L. L-2(S)(D-(Zl2)
409
it
277.0
ft
13. Width at midpoint of total tmt Zone W, = W-2(S)(D-(Z/2)
181
ft
2120
it
14. Volume of total treatment zone (Vz) Vz = L WIZ
444,174
ft3
593,211
ft3
15. Ratio ( R ) of sludge layer volume to total Treatment Volume
R = Vs/Vz
0.38
042
If the ratio R 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.
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 0.42