310039_Digester Volume Calculation Update_20231220

Facility Number: 31-039
Grower: Benson Farm Designed By: JEO
Address: PO Box 856 Checked By: DSE
Warsaw, NC 28398 Date: 11 /27/23
County: Duplin NC Sheet 1 of 12
ANAEROBIC DIGESTER DESIGN
FARM INFORMATION
Farm Population:
Nursery: ---------------- -- 0
Wean to Finish: ------------------- 0
Finishing: ------------------- 6120 Hd.
-------------------
n
------------------- 0
Boars: 0
25 Yr. / 24 Hr Storm Event ------------------- 7.5 In.
Recycle Flush Water Volume:
DIGESTER INFORMATION
Is Digester Designed as an Irregular Shape? (Y/N)------------
Was This Facility Built Prior to 9/96?
(Y/N)------------
Y
Is Drain Tile Req'd to Lower SHWT?
(Y/N)------------
N
Seasonal High Water Table Elev:
-------------------
unk
Freeboard:
-------------------
1.0
Ft.
Side Slopes:
-------------------
3
:1 (H:V)
From Lagoon Volume Check Contours
250.0
Ft.
contour areas see sheet 2 of 7...
125.0
Ft.
Top of Dike Elevation:
---------------- Depth
136.50
Ft.
Finished Bottom Elevation:
---------------- 16.50 Ft.
120.00
Ft.
Start Pump Elevation:
---------------- 20.4 In.
134.80
Ft.
Stop Pump Elevation:
---------------- 24 In.
134.50
Ft.
Top of Sludge Elevation:
---------------- 174 In.
122.00
Ft.
DIGESTER VOLUMES REQUIRED VOL.
Storm Temp= 19222 (Cu.Ft.)
Temporary = 0 (Cu.Ft.)
Operational = 195840 (Cu.Ft.)
Permanent Sludge = 0 (Cu.Ft.)
Total Volume = 215,062 (Cu.Ft.)
Lagoon Surface Area: (Inside TOD)
DESIGN VOLUMES
19,657
(Cu.Ft.)
7,989
(Cu.Ft.)
199,428
(Cu.Ft.)
10,527
(Cu.Ft.)
237,601 (Cu.Ft.)
% REQ'D.
102.26%
4.08%
101.83%
110.48%
30,755 S.F.
Smithfield Hog Production Engineering P.O. Box 856,Warsaw, NC 28398
[phone]

acility um er: 31-039
Grower: Benson Farm Designed By: JEO
Address: PO Box 856 Checked By: DSE
Warsaw, NC 28398 Date: 11/27/23
County: Duplin, NC Sheet 2 of 12
ACTUAL DESIGN VOLUME CALCULATIONS
BASE VOLUME: ®Cu. Ft.
DIGESTER STAGE -AREA VOLUMES
Contour
Elevation (FTJ Area SF Incr. Vol. (Cu. FT)
120.00
1,647
121.00
5,724
122.00
7,019
123.00
8,204
124.00
9,444
125.00
10,752
126.00
12,129
127.00
13,575
128.00
15,090
129.00
16,675
130.00
18,328
131.00
20,050
132.00
21,841
133.00
23,701
134.00
25,631
135.00
27,629
136.00
29,696
136.50
30,755
3,685
6,372
7,612
8,824
10,098
11,440
12,852
14,333
15,882
17,501
19,189
20,946
22,771
24,666
26,630
28,662
15,113
Cumul. Vol. (Cu.
470
4,155
10,527
18,139
26,963
37,060
48,501
61,353
75,685
91,568
109,069
128,258
149,203
171,975
196,640
223,270
251,932
267,045
These volumes were calculated using the vertical average end area method.
TOTAL REQD VOL
649,221
CF
CUMULATIVE
VOL.
ZONE VOL.
110.48%
END PUMP = = = =
134.50
FT
209,955 CF
TR'MT
199,428
101.83%
START PUMP = =:
134.80
FT
217,944 CF
TEMP
7,989
4.08%
MAX STORAGE =
135.50
FT
237,601 CF
STORM
19,657
102.26%
Smithfield Hog Production Engineering P.O. Box 856, Warsaw, NC 28398 [phone]

Grower: enson Farm
Address: PO Box 856
Warsaw, NC 28398
County: Duplin, NC
Designed By: JEO
Checked By: DSE
Date: 11/27/23
Sheet 3 of 12
WASTE STORAGE POND DESIGN 2nd STAGE
FARM INFORMATION
Farm Population:
Nursery. -
Wean to Finish:
-------------------
0
Finishing:
-------------------
-------------------
6120 Hd.
Storage Period:
-------------------
Days
25 Yr. / 24 Hr Storm Event
-------------------
7.5 In.
"Heavy Rain" Factor
Not Applicable Even if Value Shown
0
Rainfall in Excess of Evaporation
-------------------
7 In.
Additional Water Usage:
-------------------
0
Additional Drainage Area:
-------------------
0
STORAGE INFORMATION
Is Storage Pond Designed as an Irregular Shape? (Y/N)------------
Y
Does Operator Want Emergency Spillway?
(Y/N)------------
N
Was This Design Built Prior to 9/96?
(Y/N)------------
Y
Is Drain Tile Req'd to Lower SHWT?
(Y/N)------------
N
Seasonal High Water Table Elev:
-------------------
0.00
Freeboard:
-------------------
1.0
Ft.
Emergency Spillway Flow Depth:
Not Applicable Even if Value Shown
0
Side Slopes:
-------------------
3
:1 (H-.V)
From Lagoon Volume Check Contours
0.0
contour areas see shp-t d of 12...
0.0
Top of Dike Elevation:
---------------- Depth
99.40
Ft.
Finished Bottom Elevation:
---------------- 11.90 Ft.
87.50
Ft.
Start Pump Elevation:
---------------- 19.92 In.
97.74
Ft.
Stop Pump Elevation:
---------------- 58.4 In.
94.53
Ft.
STORAGE VOLUME REQUIRED
VOL. DESIGN VOLUMES
% REQ'D.
Storm Stor = 94914
(Cu.Ft.) 95,979 (Cu.Ft.)
101.12%
Temporary = 427313
(Cu.Ft.) 435,482 (Cu.Ft.)
101.91 %
Permanent = 0
(Cu.Ft.) 790,227 (Cu.Ft.)
Total Volume = 522,227
(Cu.Ft.) 1,321,687 (Cu.Ft.)
253.09%
90 Temporary Storage Volume Elevation = 96.83 Ft. 30.80 In.
Lagoon Surface Area: (Inside TOD)------------------- 151,862 S.F.
Smithfield Hog Production Engineering P.O. Box 856, Warsaw, NC 28398 [phone]

�Grower�nson Farm Designed By: JEO
Address: PO Box 856 Checked By: DSE
Warsaw, NC 28398 Date: 11/27/23
Countv: Duglin. NC Sheet 4 of 12
ACTUAL
DESIGN VOLUME CALCULATIONS
BASE VOLUME:
Cu. Ft.
STORAGE POND STAGE -AREA VOLUMES
Contour
Elevation (FT. i
Area (SF)
Incr. Vol. (Cu. FT]
Cumul. Vol. [.Cu. FT]
87.50
96,923
0
88.00
99,031
48,989
48,989
89.00
103,299
101,165
150,154
90.00
107,638
105,469
255,622
91.00
112,047
109,843
365,465
92.00
116,526
114,287
479,751
93.00
121,076
118,801
598,552
94.00
125,696
123,386
721,938
95.00
130,387
128,042
849,980
96.00
135,148
132,768
982,747
97.00
139,979
137,564
1,120,311
98.00
144,881
142,430
1,262,741
99.00
149,853
147,367
1,410,108
99.40
151,862
60,343
1,470,451
These volumes were calculated using the vertical average end area method.
TOTAL REQD VOL
649,221
CF
CUMULATIVE
VOL.
ZONE VOL. 253.09%
END PUMP = _ _ =
94.53
FT
790,227 CF
TR'MT
790,227
START PUMP = =
97.74
FT
1,225,709 CF
TEMP
435,482 101.91 %
MAX STORAGE =
98.40
FT
1,321,687 CF
STORM
95,979 101.12%
Smithfield Hog Production Engineering P.O. Box 856, Warsaw, NC 28398 [phone]

Grower: Benson Farm Designed By: JEO
Address: PO Box 856 Checked By: DSE
Warsaw, NC 28398 Date: 11/27/23
County: Duplin, NC Sheet 5 of 12
MINIMUM REQUIRED VOLUME CALCULATIONS DIGESTER
Permanent Storage:
Required Treatment Volume:
Animal Type Capacity (cu.ft./hd) = Total'I
Nurse
Wean to Finish
0
32.00
0
Finishing
6,120
32.00
195,840
feeder
.00
Farrow to finish
1
.00
Total Required Treatment Volume (cu. ft.)=
Sludge Storage Volume:
195,840
Animal Type Capacity ALW (cu.ft./lb) = Total'
Nurse
Wean to Finish
0
115
0.000
0
Finishing
6,120
135
0.00
0
Farrow weanling
0
0
Farrow feede
finis
0
1 1
Soars
Total Required Sludge Storage Volume (cu. ft.)=
No Storm Storage Unless a Partial Cover Digester:
Vol.=(Digester Surf. Area + Addt'I Drainage Area) * 25Yr./24Hr. Storm(in) / 12in./ft.
Vol.= (30755 sq.ft + 0 sq.ft.) * 7.5 in. /12 in./ft.
Total Required Volume for 25Yr.124Hr. Storm Event (cu.ft)=
No "Heavy Rain" Storage Unless a Partial Cover Digester:
Vol.=(Digester Surf. Area + Addt'I Drainage Area) * "Heavy Rain" Factor (in) / 12in./ft.
Vol.= (30755 sq.ft + 0 sq.ft.) * 0.0 in. /12 in./ft.
Total Required Volume for "Heavy Rain" (cu.ft.) _
(for Extended Periods of Chronic Rainfall)
'..
0
19,222
Total Required Storm Storage
(25Yr. / 24Hr. Storm +'Heavy Rain')= 19,222 (CU.FT)
Total Required Permanent Storage
(Treatment + Sludge) = 195,840 (CU.FT)
TOTAL REQUIRED DIGESTER VOLUME = 215062 (CU.FT.)
0

Grower: Benson Farm Designed By: JEO
Address: PO Box 856 Checked By: DSE
Warsaw, NC 28398 Date: 11/27/23
Countv: Duplin, NC Sheet 6 of 12
Temporary Storage Volume:
Manure Production:
Animal Type Capacity to. Period = Total
0
0
Wean to Finish
0
180
1.17
0
Finishing
6,120
180
1.40
1,542,240
Farrow
0
feede,
0
4.50
nish
0
Excess Fresh Water:
Smithfield Hog
Total Manure Production (gals.)= 1,542,240
Total Manure Production (cu.ft.)= 206,182
Animal Type Capacity Sto. Period = Total
0
Wean to Finish
0
180
0.77
0
Finishing
6,120
180
0.90
991,440
Farrow weanline
2.90
Farrow to feeaer
3.50
Farro to
Total Fresh Water Excess (gals.)= 991,440
Total Fresh Water Excess (cu.ft.)= 132,545
w

Grower: Benson Farm Designed By: JEO
Address: PO Box 856 Checked By: DSE
Warsaw, NC 28398 Date: 11/27/23
County: Duplin, NC Sheet 7 of 12
Tem ora Storage Volume: Cont.
Rainfall in Excess of Evaporation: Only in Waste Storage Pond since digester is covered
Vol.=(Digester Surface Area + Waste Storage Pond Area + Additional Drainage Area) * Rainfall / 12in./ft
Vol.= (0.0 sq.ft. + 151862 sq.ft. + 0 sq.ft.) * 7.0 in. /12 in./ft.
Total Required Volume for Rainfall in Excess of Evap. (cu.ft.)= 88,586
Storm Storage: Only in Waste Storage Pond since digester is covered
Vol.=(Waste Storage Pond Area + Additional Drainage Are * 25Yr./24Hr Storm(in.)/12in./ft.
Vol.= (0.0 sq.ft. + 151862 sq.ft. + 0 sq.ft.) * 7.5 in.
Total Required Volume for 25Yr./24Hr. Storm Event (cu.ft)= 94,914
"Heavy Rain" Storage: Only in Waste Storage Pond when required since digester is covered
Vol.=(Waste Storage Pond Area + Additional Drainage Area) * = Heavy Rain Factor(in) / 12in./ft.
Vol.= (0.0 sq.ft. + 151862 sq.ft. + 0 sq.ft.) * 7.5 in. /12 in./ft.
Total Required Volume for "Heavy Rain" (cu.ft.) = 0
(for Extended Periods of Chronic Rainfall)
Additional Water Storage:
No Additional Water Storage is Required
0
Total Required Storm Storage
(25Yr. / 24Hr. Storm +'Heavy Rain')=
Total Required Temporary Storage
(Manure Prod. + Excess Fr. Water + Rainfall Excess + Additional Water Storage)=
Total Required Permanent Storage
(Treatment + Sludge) _
94,914 (CU.FT)
427,313 (CU.FT)
0 (CU.FT)
TOTAL REQUIRED 2nd STAGE VOLUME = 522227 (CU.FT.)
0

Grower: Benson Farm
Address: PO Box 856
Warsaw, NC 28398
County: Duplin, NC
DIGESTER DESIGN SUMMARY
Designed By: JEO
Checked By: DSE
Date: 11 /27/23
Sheet 8 of 12
Top of Dike Elevation ------------------- 136.50 FT.
Top of 25Yr. / 24Hr. Storm Storage ------------------- 135.50 FT.
Start Pump Elevation ------------------- 134.80 FT.
End Pump Elevation ------------------- 134.50 FT.
Top of Sludge Storage ------------------- 122.00 FT.
Seasonal High Watertable Elev.------------------- unk
Finished Bottom Elevation ------------------- 120.00 FT.
Inside Top Length ------------------- Not Applicable
Inside Top Width ------------------- Not Applicable
Side Slopes ------------------- 3.0:1 H:V
Lagoon Surface Area ------------------- 30,755 SF
-------------------
Freeboard Depth ------------------- 1.00 FT,
Zone Depths:
TOTAL DESIGN VOLUME = 237601 (CU.FT.)
Treatment / Sludge Storage Zone Depth ----------- 14.5 FT.
Temporary Storage Zone Depth ----------- 0.3 FT.
Freeboard Depth ----------- 1.7 FT.
Total Digester Depth ----------- 16.5 FT,
I
Smithfield Hog Production Engineering P.O. Box 856, Warsaw NC 28398 [phone]

Grower: Benson Farm Designed By: JEO
Address: PO Box 856 Checked By: DSE
Warsaw, NC 28398 Date: 11/27/23
County: Duplin, NC Sheet 9 of 12
STORAGE POND DESIGN SUMMARY 2nd STAGE
Top of Dike Elevation -------------------
99.40
FT.
Emergency Spillway Crest Elevation -------------------
Not
Applicable
Top of 25Yr. / 24Hr. Storm Storage -------------------
98.40
FT.
Top of "Heavy Rain" Storage -------------------
Not
Applicable
Start Pump Elevation -------------------
97.74
FT.
End Pump Elevation -------------------
94.53
FT.
Top of Sludge Storage -------------------
Not
Applicable
Seasonal High Watertable Elev.-------------------
0.00
Finished Bottom Elevation -------------------
87.50
FT.
Inside Top Length -------------------
Not
Applicable
Inside Top Width -------------------
Not
Applicable
Side Slopes -------------------
3.0:1
H:V
Lagoon Surface Area -------------------
151,862
SF
Freeboard Depth
Temporary Storage Period
Zone Depths:
1.00 FT.
180 Days
TOTAL DESIGN VOLUME = 1652581 (CU.FT.)
Treatment / Sludge Storage Zone Depth ----------- 7.0 FT.
Temporary Storage Zone Depth ----------- 3.2 FT.
Freeboard / Storm Storage Zone Depth ----------- 1.7 FT.
Total Storage Pond Depth ----------- 11.9 FT
Smithfield Hog Production Engineering P.O. Box 856, Warsaw NC 28398 [phone]

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Grower: Benson Farm Designed By: JEO
Address: PO Box 856 Checked By: DSE
Warsaw, NC 28398 Date: 11/27/23
County: Duplin, NC Sheet 12 of 12
This Anerobic Digester is designed in accordance with the North Carolina Natural Resources Conservation
Service PRACTICE STANDARD 366- ANEROBIC DIGESTER, revised in September, 2018.
The Waste Storage Pond is designed in accordance with the North Carolina Natural Resources Convservation
Service PRACTICE STANDARD 313- WASTE STORAGE FACILITY, revised in December, 2017.
11 /27/2023
DATE: 11 /27/2023
COMMENTS: The lagoon has been designed as an irregular shape. Actual contour areas
taken from the lagoon design are used to calculate the surface area and storage volume
characteristics of the lagoon. This approach ensures that rainfall capture on the lagoon is
fully accounted for and that storage volumes calculated represent actual conditions.
Elevations are based on an assumed benchmark and do not represent mean sea level datum.
/ certify, to the best of my professional knowledge, judgement, and belief, this design calculation
is in accordance with the applicable NRCS standards.
Smithfield Hog Production Engineering P.O. Box 856, Warsaw NC 28398 [phone]