660030_8527 Digester calcs_20230103

Facility Number: 66-0030
Grower: Gaston Farm 8527 Primary Designed By: JEO
Address: PO Box 1240 Checked By: DSE
Waverly, VA 23890 Date: 01/03/23
County: Northampon, NC Sheet 1 of 12
ANAEROBIC DIGESTER DESIGN
FARM INFORMATION
Farm Population:
Nursery:
Wean to Finish:
Finishing:
Farrow to weanling:
Farrow to feeder:
Farrow to finish:
Boars:
25 Yr. / 24 Hr Storm Event
Recycle Flush Water Volume:
DIGESTER INFORMATION
Is Digester Designed as an Irregular Shape? (YIN) ------------ Y
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: -------------------
Freeboard:-------------------
0
24642 Hd.
0
0
0
0
0
6.7 In.
126.00 Ft.
1.0 Ft.
Side Slopes:
-------------------
3 :1 (H:V)
495.0
Ft.
377.0
Ft.
Top of Dike Elevation:
---------------- Depth
136.30
Ft.
Finished Bottom Elevation:
BOTTOM E 14.76 Ft.
121.54
Ft.
Start Pump Elevation:
---------------- 19.08 In.
134.71
Ft.
Stop Pump Elevation:
---------------- 27.00 In.
134.05
Ft.
Top of Sludge Elevation:
---------------- 135.6 In.
125.00
Ft.
DIGESTER VOLUMES REQUIRED VOL.
Storm Temp= 105174 (Cu.Ft.)
Temporary = 0 (Cu.Ft.)
Operational = 1355310 (Cu.Ft.)
Permanent Sludge 0 (Cu.Ft.)
Total Volume = 1,460,484 (Cu.Ft.)
Lagoon Surface Area: (Inside TOD)
DESIGN VOLUMES
106,292
(Cu.Ft.)
117,129
(Cu.Ft.)
1,412,312
(Cu.Ft.)
407,593
(Cu.Ft.)
2,043,327 (Cu.Ft.)
% REQ'D.
101.06%
8.64%
104.21 %
139.91 %
188,372 S.F.
Smithfield Nog Production Engineering P.O. Box 856, Warsaw, NC 28398 [phone]

aci ity Number: 66-0030
Grower: Gaston Farm 8527 Primary Designed By: JEO
Address: PO Box 1240 Checked By: DSE
Waverly, VA 23890 Date: 01/03/23
County: Northampon, NC Sheet 2 of 12
ACTUAL DESIGN VOLUME CALCULATIONS
BASE VOLUME: ©Cu. Ft.
DIGESTER
STAGE -AREA VOLUMES
Contour
Elevation (FT.)
Area SF Incr. Vol. (Cu. FT}
Cumul. Vol. (Cu. FT
123.54
128,451
214,515
124.00
130,937
59,659
274,174
125.00
135,900
133,419
407,593
126.00
140,368
138,134
545,727
127.00
144,850
142,609
688,336
128.00
149,437
147,143
835,479
129.00
154,114
151,775
987,255
130.00
158,548
156,331
1,143,585
131.00
162,667
160.607
1,304,193
132.00
166,821
164,744
1,468,936
133.00
171,033
168,927
1,637,863
134.00
175,304
173,169
1,811,032
135.00
179,634
177,469
1,988,501
136.00
185,875
182,754
2,171,255
136.30
188,372
56,137
2,227,392
These volumes were calculated using the vertical average end area method
TOTAL REQD VOL 1,460,484
CF
CUMULATIVE
VOL.
ZONE VOL.
139.91%
END PUMP = = = = 134.05
FT
1,819,905 CF
TR'MT
1,412,312
104.21 %
START PUMP = =: 134.71
FT
1,937,035 CF
TEMP
117,129
8.64%
MAX STORAGE = 135.30
FT
2,043,327 CF
STORM
106,292
101.06%
Smithfield Hog Production Engineering P.O. Box 856, Warsaw, NC 28398 [phone]

Grower: Gaston Farm econ ary Designed y: JEO
Address: PO Box 1240 Checked By: DSE
Waverly, VA 23890 Date: 01/03/23
County: Northampon, NC Sheet 3 of 12
WASTE STORAGE POND DESIGN 2nd STAGE
FARM INFORMATION
Farm Population:
Nursery: -------------------
0
Wean to Finish: -------------------
24642 Hd.
Finishing: -------------------
0
Farrow to weanling:-------------------
0
Farrow to feeder: -------------------
0
Farrow to finish: -------------------
0
Boars: -------------------
0
Storage Period: -------------------
180 Days
25 Yr. / 24 Hr Storm Event -------------------
6.7 In.
"Heavy Rain" Factor Not Applicable Even if Value Shown
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:
-------------------
126.00
Ft.
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 shPPt d of 12...
0.0
Top of Dike Elevation:
---------------- Depth
136.30
Ft.
Finished Bottom Elevation:
BOTTOM E 13.76 Ft.
122.54
Ft.
Start Pump Elevation:
---------------- 19.08 In.
134.71
Ft.
Stop Pump Elevation:
---------------- 99.6 In.
128.00
Ft.
CHECK
PUMPING ELEVATIONSM
STORAGE VOLUME REQUIRED VOL. DESIGN VOLUMES
% REQ'D.
Storm Stor = 50487
(Cu.Ft.) 50,486 (Cu.Ft.)
100.00%
Temporary = 744788
(Cu.Ft.) 507,711 (Cu.Ft.)
68.17%
Permanent = 0
(Cu.Ft.) 374,446 (Cu.Ft.)
Total Volume = 795,275
(Cu.Ft.) 932,642 (Cu.Ft.)
117.27%
90 Temporary Storage Volume Elevation = 130.31 Ft. 1 71.90 In.
Lagoon Surface Area: (Inside TOD)------------------- 90,424 S.F
Smithfield Hog Production Engineering P.O. Box 856 ,Warsaw, NC 28398 [phone]

Grower: Gaston Farm 8527 Secondary Designed By: JEO
Address: PO Box 1240 Checked By: DSE
Waverly, VA 23890 Date: 01/03/23
Countv: Northamr)on, NC Sheet 4 of 12
ACTUAL DESIGN VOLUME CALCULATIONS
BASE VOLUME: ®Cu. Ft.
STORAGE POND STAGE -AREA VOLUMES
Contour
Elevation (FT.)
Area (SF)
Incr. Vol. (Cu. FT
124.54
54,226
125.00
56,421
25,449
126.00
60,919
58,670
127.00
64,448
62,683
128.00
67,055
65,751
129.00
69,537
68,296
130.00
72,056
70,796
131.00
74,618
73,337
132.00
77,224
75,921
133.00
79,873
78,549
134.00
82,565
81,219
135.00
85,301
83,933
136.00
89,002
87,152
136.30
90,424
26,914
Cumul. Vol. (Cu. FTC
161,892
187,341
246,011
308,695
374,446
442,741
513,538
586,875
662,796
741,344
822,563
906,497
993,649
1,020,563
These volumes were calculated using the vertical average end area method.
TOTAL REQD VOL 1,460,484
CF
CUMULATIVE
VOL.
ZONE VOL. 117.27%
END PUMP = = = = 128.00
FT
374,446 CF
TR'MT
374,446
START PUMP = =: 134.71
FT
882,156 CF
TEMP
507,711 68.17%
MAX STORAGE = 135.30
FT
932,642 CF
STORM
50,486 100.00%
Smithfield Nog Production Engineering P.O. Sox 856 ,Warsaw, NC 28398 [phone]

Grower: Gaston Farm 8527 Primary Designed By: JEO
Address: PO Box 1240 Checked By: DSE
Waverly, VA 23890 Date: 01/03/23
County: Northampon, NC Sheet 5 of 12
MINIMUM REQUIRED VOLUME CALCULATIONS DIGESTER
Permanent Storage:
Required Treatment Volume:
Animal ype Capacity (cu.ft. hd) = Total
Nursery
0
1.00
0
Wean to Finish
24,642
55.00
1,355,310
Finishing
0
32.00
0
Farrow to weanling
0
1.00
0
Farrow to feeder
0
1.00
1 0
Farrow to finish
0
1.00
0
Boars
0
1.00
0
Total Required Treatment Volume (cu. ft.)= 1,355,310
Sludge Storage Volume:
Animal Type Capacity ALW (cu. t.11b) = Total
Nursery
0
30
0.00
0
Wean to Finish
24,642
115
0.00
0
Finishing
0
135
0.00
0
Farrow to weanling
0
433
0.00
0
Farrow to feeder
0
522
0.00
0
Farrow to finish
0
1,417
0.00
0
Boars
0
400
0.00
0
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.= (188372 sq.ft + 0 sq.ft.) * 6.7 in. /12 in./ft.
Total Required Volume for 25Yr./24Hr. 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.= (188372 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)
N
105,174
Total Required Storm Storage
(25Yr. / 24Hr. Storm +'Heavy Rain')= 105,174 (CU.FT)
Total Required Permanent Storage
(Treatment + Sludge) = 1,355,310 (CU.FT)
TOTAL REQUIRED DIGESTER VOLUME = 1460484 (CU.FT.)
Production
0
10) 293-3434

Grower: Gaston Farm 8527 Secondary Designed By: JEO
Address: PO Box 1240 Checked By: DSE
Waverly, VA 23890 Date: 01 /03/23
County: Northampon, NC Sheet 6 of 12
Temporary Storage Volume:
Manure Production:
IA-pimal Type Capacity Sto. Period=Total
Nursery
0
0
0.30
Wean to Finish
24,642
180
1.17
!'10
Finishing
0
180
1.37
Farrow to weanling
0
0
4.39
Farrow to feeder
0
0
5.30
1 0
Farrow to finish
0
0
114.38
1 0
Boars
0
0
1 4.06
0
Total Manure Production (gals.)= 5,176,463
Total Manure Production (cu.ft.)= 692,040
Excess Fresh Water:
jAnimal TypeCapacity' to. Period I ota
Nursery
0
0
0.00
0
Wean to Finish
24,642
180
0.00
0
Finishing
0
180
0.00
0
Farrow to weanling
0
0
0.00
0
Farrow to feeder
0
1 0
0.00
0
Farrow to finish
0
0
0.00
0
Boars
0
0
0.00
0
Total Fresh Water Excess (gals.)=
Total Fresh Water Excess (cu.ft.)=
Smithfield Hog
0
0
[phone]

Grower: Gaston Farm 8527 Secondary Designed By: JEO
Address: PO Box 1240 Checked By: DSE
Waverly, VA 23890 Date: 01/03/23
County: Northampon, NC Sheet 7 of 12
Temporary 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. + 90424 sq.ft. + 0 sq.ft.) * 7.0 in. /12 in./ft.
Total Required Volume for Rainfall in Excess of Evap. (cu.ft.)= 52,747
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. + 90424 sq.ft. + 0 sq.ft.) * 6.7 in. /12
Total Required Volume for 25Yr./24Hr. Storm Event (cu.ft)= 50,487
"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. + 90424 sq.ft. + 0 sq.ft.) * 0.0 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) _
50,487 (CU.FT)
744,788 (CU.FT)
0 (CU.FT)
TOTAL REQUIRED 2nd STAGE VOLUME = 795275 (CU.FT.)
LVA
10) 293-3434
0

Grower: Gaston Farm 8527 Primary Designed By: JEO
Address: PO Box 1240 Checked By: DSE
Waverly, VA 23890 Date: 01/03/23
County: Northampon, NC Sheet 8 of 12
DIGESTER DESIGN SUMMARY
Top of Dike Elevation ------------------- 136.30 FT.
Top of 25Yr. / 24Hr. Storm Storage
135.30 FT.
Start Pump Elevation -------------------
134.71
FT.
End Pump Elevation -------------------
134.05
FT.
Top of Sludge Storage -------------------
125.00
FT.
Seasonal High Watertable Elev-------------------
126.00
FT.
Finished Bottom Elevation -------------------
121.54
FT.
Inside Top Length -------------------
Not
Applicable
Inside Top Width -------------------
Not
Applicable
Side Slopes -------------------
3.0:1
H:V
Lagoon Surface Area -------------------
188,372
SF
Freeboard Depth
Zone Depths:
TOTAL DESIGN VOLUME = 2043327 (CU.FT.)
Treatment / Sludge Storage Zone Depth
Temporary Storage Zone Depth
Freeboard Depth
Total Digester Depth
Smithfield Hog Production
1.00 FT.
12.5 FT.
0.7 FT.
1.6 FT.
14.8 FT.

Grower: Gaston Farm 8527 Secondary Designed By: JEO
Address: PO Box 1240 Checked By: DSE
Waverly, VA 23890 Date: 01 /03/23
County: Northampon, NC Sheet 9 of 12
STORAGE POND DESIGN SUMMARY 2nd STAGE
Top of Dike Elevation -------------------
136.30
FT.
Emergency Spillway Crest Elevation -------------------
Not
Applicable
Top of 25Yr. / 24Hr. Storm Storage -------------------
135.30
FT.
Top of "Heavy Rain" Storage -------------------
Not
Applicable
Start Pump Elevation -------------------
134.71
FT.
End Pump Elevation -------------------
128.00
FT.
Top of Sludge Storage -------------------
Not
Applicable
Seasonal High Watertable Elev-------------------
126.00
FT.
Finished Bottom Elevation -------------------
122.54
FT.
Inside Top Length -------------------
Not
Applicable
Inside Top Width -------------------
Not
Applicable
Side Slopes -------------------
3.0:1
H:V
Lagoon Surface Area -------------------
90,424
SF
Freeboard Depth
Temporary Storage Period
Zone Depths:
1.00 FT.
180 Days
TOTAL DESIGN VOLUME = 932642 (CU.FT.)
Treatment / Sludge Storage Zone Depth ----------- 5.5 FT.
Temporary Storage Zone Depth ----------- 6.7 FT.
Freeboard / Storm Storage Zone Depth ----------- 1.6 FT.
Total Storage Pond Depth ----------- 13.8 FT.
Smithfield Hop Production Enqineerinq P.O. Box 856, Warsaw NC 28398 [phone]

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Grower: Gaston Farm 8527 Primary Designed By: JEO
Address: PO Box 1240 Checked By: DSE
Waverly, VA 23890 Date: 01/03/23
County: Northampon, 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
DESIGNED:
DATE: 01 /03/2023
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.
1 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]