310239_Add-Info Response 2_20240828

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ENGINEERS • MANUFACTURERS • CONSTRUCTORS
Ms. Christine Lawson
Engineer III
Animal Feeding Operations
NCDEQ Department of Water Resources
SUBJECT: Additional Information Request - 2
Application No. ADS310239
Melvin Bostic Farm
Duplin County
Dear Ms. Lawson,
9200 Watson Rd. Suite 200, St. Louis, MO 63126 0
(314) 729 - 0055 t,
www.roestein.com : r
27 Aug 2024
Melvin Bostic Farm
Application No. ADS310239
Please see below for responses to the request for additional information, dated August 22, 2024, in relation to the digester permit
application for Melvin Bostic Farm. The original Additional Information Request is attached.
o Waste Level Gauge
• Volume calculations have been revised to account for two 25-yearl24-hour storm events from all contributing drainage
areas. We have removed the term `operating height" from the volume calculation table. Verbiage has been updated to
state that a new freeboard of 49" is required to account for additional rainfall from lagoons upstream. A new level gauge
will be provided in the lagoon and marked to indicate 49" freeboard. Please reference the revised calculation table
attached.
The existing lagoon calculations have been marked up to indicate revised freeboard and start and stop pump elevations.
Please reference markup attached.
Influent Mixing Well
• As discussed, the mixing well will be eliminated from our design. For clarification, this was not an influent mixing well, as it
pulled water from the digester and discharged water back into the digester. Influent into the digester will either come from
a wet well lift station between the barns and digester or directly from the barns via gravity pipe. The sampling protocol
document verbiage has been updated to clarify that all digester influent sampling will be taken via cleanout in the influent
piping prior to entering the lagoon. Please reference the revised sampling protocol attached.
Please let us know if you have any further comments or need any further information. Thank you.
Sincerely,
Roeslein & Associates, Inc.
G-
Chris Fey
Manager, Building Design & Construction
Page 1 of 1

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
William M. Bostic
Melvin Bostic Farm
1200 S Dobson Chapel Rd
Magnolia, NC 28453-8676
Dear William M. Bostic:
NORTH CAROLINA
Environmental Quality
August 22, 2024
Subject: Additional Information Request — 2
Application No. ADS310239
Melvin Bostic Farm
Duplin County
The Animal Feeding Operations Program of the Division of Water Resources (Division) has completed a
preliminary review of the subject application received on May 10, 2024 and Additional Information
Response received July 10, 2024, for permit coverage under Swine Farm Digester Waste Management
System General Permit AWG400000 for the construction of an anaerobic digester to capture biogas as a
part of the proposed farm digester system at the Melvin Bostic Farm. Additional information/clarification
is required before we may continue our review. Please address and submit the following item(s) within 30
(thirty) days of receipt of this letter.
❑ Waste Level GgIWe — thank you for the information provided in the first response regarding the
digester gauge as well as the volume calculations for Lagoon 27500B. In the response letter you
stated that the operating height in Lagoon 27500B would be reduced from 10.65 ft to 10.13 ft (44.63
elevation). This volume appears to represent the volume of one 25-year/24-hour storm event for
Lagoon 27500A. However, Lagoon 27500B was built in 1997 and requires storage volume for two
25-year/24-hour storm events for all the contributing drainage area (the second storm volume is the
"heavy rainfall" factor). Please provide revised calculations.
Please verify that the "operating height" means the same as the compliance level, or what is
commonly referred to as "start pump" or "redline". Please also state what the freeboard compliance
level would be — currently the freeboard compliance level for Lagoon 27500B is 27 inches (or 45.15
elevation). Once the gravity crossover pipe is installed, the freeboard marker in Lagoon 27500B
must be reset to show the proper compliance level.
❑ Influent Mixing Well — During an August 21, 2024 meeting, Chris Fey, Roeslein & Associates,
stated that the system design is being modified to eliminate the Influent Mixing Station. If the
Influent Mixing Station is to be eliminated, please provide updated information regarding influent
into the digester. Where/how will influent sampling be conducted?
Please be aware that you are responsible for meeting all requirements set forth in North Carolina rules and
regulations. Any oversights that occurred in the review of the subject application package are still the
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 1 1636 Mail Service Center I Raleigh, North Carolina 27699-1636
NORTH CARCLINA
919.707.9129

William M. Bostic
ADS310239
Additional Information Request — 2
August 22, 2024
Page 2 of 2
responsibility of the applicant. In addition, any omissions made in responding to the above items shall
result in future requests for additional information.
Please reference the subject application number when providing the requested information. All revised
and/or additional documentation shall be signed, sealed and dated, submitted to my attention at the address
below. Failure to provide this additional information on or before the above requested date may result in
your application being returned as incomplete.
If you have any questions regarding this letter, please feel free to contact me at [phone] or
[e-mail].
Sincerely,
Signed by:
@iS�iln t, 6. tAWS&A,
715598463EA94B7...
Christine B. Lawson
Engineer
Animal Feeding Operations
cc: Wilmington Regional Office, Water Quality Regional Operations Section — via email
Roeslein & Associates, Inc. — Chris Fey
Laserfiche — File No. 310239
REQ5 North Carolina Department ofEnvironmental Quality I Division ofWater Resources
512 North Salisbury Street 1 1636 Mail Service Center I Raleigh, North Carolina 27699-1636
NORTH CAROLINA 919.707.9129
naparMeM of EmironmanW 9uallly

ROESLEIN.
Digester- Volume Calculations
Project: BOSTIC, MELVIN Location: Duplin County, NC
Project No: RA270 Design By: JRE
Date: 2024-08-26 Checked By: MWK
Rev: 0
Existing Configuration (For Reference)
Farm Information: Farm Population:
BOSTIC, MELVIN 4,800 GF
Total: 4,800
Storm and Rainfall:
Storm (25-yr, 24-hr): 7.5 in.
"Heavy Rain": 7.5 in.
Proposed Configuration (Proposed Digester)
Flow Path: Barns -> Digester (Proposed) -> Existing Lagoon
*Note: Roeslein Digesters are designed regarding Hydraulic Retention Time, not Minimum Treatment Volume for hog farms
*Note: New digester lagoon is not providing additional evaporative treatment storage capacity, but instead serves as a steady-state reservoir,
diverting additional water volume to existing evaporative treatment lagoons
*Note: Existing Melvin Bostic lagoons designed by Jimmy Vinson 4-11-1997, 11-26-1991
Volumes:
Total Capacity
4,800
Capacity i cf/head 1=Total
Treatment Volume=1 4,800 1 501 240,000 cf
Capacity I Retention Time (days) -Total
Volume for Retention Time= 4,800 1 40.00 121,048 cf
Volume Required (cf)
Volume Provided (cf)
Lagoon Calculations
Lagoon Volumes
Desired Digester Treatment Volume
240,000
241,140
Sludge Storage
0
0
Storm Storage
0
0
"Heavy Rain"
0
0
Total
240,000
241,140
Note: Sludge storage value is shown as 0 because seed sludge volume is negligible and influent sludge volume is accounted for in the 50 cuft/hd
and 40 days HRT values.
Note: "Heavy Rain" and "Storm Storage" volume requirements addressed below
Total Temorary Storage
Proposed Configuration (Proposed Digester)
Digester (Proposed) Volume
Vol. (cf)
High Pump Elev. 249,951
Low Pump Elev.1 232,479
Temorary Storagel 17,472
Digester (Proposed) Berm Length (FT): 285
Digester (Proposed) Berm Width (FT): 140
Digester (Proposed) Berm Slope: 3
Digester (Proposed) Stage -Storage
Elevation (ft)
Area (sf)
Incr. Vol. (cf)
Cumul. Vol. (cf)
81.9
14,484
82.9
16,206
15,339
15,339
83.9
18,000
17,097
32,436
84.9
19,866
18,927
51,363
85.9
21,804
20,829
72,192
86.9
23,814
22,803
94,995
87.91
25,896
24,849
119,844
88.9
28,050
26,967
1 146,811
89.9
30,276
29,157
175,968
90.9
32,574
31,419
207,387
91.9
34,944
33,753
241,140
92.9
37,386
36,159
277,299
93.9
39,900
38,637
315,936
Digester Treatment Volume: Elevation (ft) Cumul. Vol. (cf)
at High Pump Elevation of. 92.15 249,951
at Start Pumping Elevation of:1 91.461 226,066
at Low Pump Elevation of:1 91.651 232,479
Elevation Vol. (cf)
Top of Dike Elev. = 93.9 315,936
Top of Storm Elev. = 92.86 275,941
High Pump Elev. = 92.15 249,951
Start Pumping Elev. = 91.46 226,066
Low Pump Elev. = 91.65 232,479
Planned Sludge Elev. = 83.9 32,436
Finished Bottom Elev. = 81.9
NC Department of Environmental Quality- Hog Waste Storage Requirements
REQUIRED CAPACITY VOLUMES HAVE BEEN PREVIOUSLY CALCULATED BY OTHERS USING NCDEQ STANDARDS (135 lb/hog * cuft/lb) AS WELL AS APPROPRIATE RAINFALL AND ADDITIONAL TREATMENT WATER
Storm Storage & Heavy Rain
Lagoon
Req'd Capacity*
Rainfall Volume (cuff)
Total Capacity*
Lagoon 27000
N/A
49,875
277,299
Lagoon 27500A
576,789
Included
586,160
Lagoon 27500B
562,092
Included
575,472
Total
1,138,881
49,875
1,438,931
Volume (cuft)
Total Required
1,138,881
Digester Rainfall
49,875
Total Capacity
1,438,931
Remaining
250,175
Usage
83%
Pump Level Changes
Per Roeslein design and modifications, all lagoons will gravity effluent to Lagoon 27500E
Start Pumping Change
Lagoon
Lagoon Area (sgft.)
Rainfall Volume (cuft)
Lagoon 27000
39,900
49,875
Lagoon 27500A
77,000
96,250
Lagoon 27500E
67,600
84,500
Total
230,625
Total Capacity
Pre -Rainfall Volume
Lagoon 27500E
575,472
344,847
Note: Since Lagoon 27000B was built after 1996, rainfall from all sources have been doubled.
To avoid over-f lling Lagoon 27500B in the event of a historic rainfall, it is the recommendation of Roeslein that pumping begins at 342,612 cuft.
This would reduce the pre -rainfall height of Lagoon 27500B from 10.65 ft. to 8.03 ft. (86.03 ft. elevation).
This modification will increase the pre -rainfall freeboard from 27 in. to 59 in. to accommodate the additional rainfall from Lagoon 27000 and Lagoon 27500A.
This modification will ensure the 12 in. of freeboard required (per the NRCS Anaerobic Digester standard) in Lagoon 27500B after the historic rainfall event.
Stop Pumping Change
Min. Treatment Vol New Digester Reduction Remaining Req. Volume
Lagoon 27500B 1 259,200 277,299 (18,099)
With additional treatment volume added by the new digester, the stop pumping volume of Lagoon 27500B can be reduced to 289,492 cuft.
This would reduce the stop -pumping elevation of Lagoon 27500E from 7.69 ft. to 7 ft. (85 ft. ev).
Note: Due to seasonal high watertable elevation, 7 ft. of water is the minimum water height recommended.
*Existing lagoon capacities gathered from previous farm permit documentation - designed and signed by Jimmy Vinson 4-11-1997, 11-26-1991
*Req'd Capacity from previous farm permit does already includes volume from historic rainfall events
*Note: A 25-year storm creates 49875 cuft of water. Added to the Start Pumping Elevation of the new Digester, this raises the water elevation to 92.86 ft.
This provides 12.44 in. of freeboard, meeting the standard 12 in. required per the NRCS Anaerobic Digester standard.

REVISED LAGOON FREEBOARD - LAGOON 27500B
08/24/24
EXISTING LAGOON FREEBOARD, START PUMP, AND STOP PUMP LEVELS HAVE BEEN REVISED
TO ACCOUNT FOR INSTALLATION OF GRAVITY TRANSFER PIPE BETWEEN LAGOON 25700A
AND 25700B.
Operator:Mel Bostic County: Duplin Date: 04/10/97
Has the site evaluation been completed & approved: yes
1. AVERAGE LIVE WEIGHT (ALW)
0
sows
(farrow to
finish)
x 1417
lbs.
- 0
lbs
0
saws
(farrow to
feeder)
x 522
lbs.
- 0
lbs
1920
head
(finishing
only)
x 135
lbs.
_ 259200
lbs
0
sows
(farrow to
wean)
x 433
lbs.
- 0
lbs
0
head
(wean to feeder)
x 30
lbs.
_ 0
lbs
Describe other :
0
lbs
Total Average Live Weight = 259200 lbs
2. MINIMUM REQUIRED TREATMENT VOLUME OF LAGOON
Volume = 259200 cubic ft (includes 0 cu. ft. add. treat. vol.)
3. STORAGE VOLUME FOR SLUDGE ACCUMULATION
Volume = 65280.0 cubic feet
4 TOTAL DESIGNED VOLUME
Inside top length (feet) --------------------- 260.0
Inside top width (feet) ------------------------- 260.0
Top of dike elevation (feet) ----------------- 47.50
Bottom of lagoon elevation (feet) ------------ 34.50
Freeboard. (feet) - ----------------------------- 1.00
Emergency spillway depth of flow(feet)------- 0.00
Side slopes (inside lagoon) ------------------ 3.0 : I
Total design volume using prismoidal formula
SS/END1 SS/END2 SS/SIDE1 SS/SIDE2 LENGTH WIDTH DEPTH
3.0 3.0 3.0 3.0 254.0 254.0 12.00
AREA OF TOP
LENGTH * WIDTH =
254.0 254.0 64516 (AREA OF TOP)
AREA OF BOTTOM
LENGTH * WIDTH =
182.0 192.0 33124 (AREA OF BOTTOM)
AREA OF MIDSECTION
LENGTH * WIDTH * 4
218.0 218.0 190096 (AREA OF MIDSECTION * 4)
CU. FT. = [AREA TOP + (4*AREA MIDSECTION) + AREA BOTTOM] * DEPTH/6
64516 190096 33124 2.00

REVISED LAGOON FREEBOARD - LAGOON 27500B
08/24/24 Total Designed Volume Available = 575472 CU. FT,
/74

REVISED LAGOON FREEBOARD - LAGOON 27500B
08/24/24
5. TEMPORARY STORAGE REQUIRED
DRAINAGE AREA:
Lagoon (top of dike)
{ Length * Width ) + Surface area of connecting waste facility
260.0 260.0 0.0
67600.0 square feet
Buildings (roof and lot water) or impervious area
0.0 square feet Describe this area.
TOTAL DA 67600.0 square feet
Design temporary storage period to be 180 days.
5A. Volume of waste produced
Feces & urine production in gal./day per 131 lb. ALW 1.37
Volume = 259200 lbs. ALW/135 lbs. ALW * 1-37 gal/day 180 days
Volume = 473472 gals. or 63298.4 cubic feet
5B. Volume of excess water
Volume = 1737.8 gallons/day * 180 days storage/7.48 gallons
per CF
Volume = 41317.6 cubic feet
5C. Volume of rainfall in excess of evaporation
Use period of time when rainfall exceeds evaporation by largest amount.
180 days evaporation — 0.0 inches
180 days rainfall — 8.5 inches
Volume = 8.5 in * DA / 12 in. per ft. = 47996 cubic feet runoff
Volume = 0.0 in * lagoon DA/12 in./ft = 0 cubic feet evap.
Volume = 47996 cubic feet

REVISED LAGOON FREEBOARD - LAGOON 27500B
08/24/24
5D. Volute of 25 year 24 hour storm 7.5 in.
Volume of "Heavy Rain" 7.5 in.
Volume = 15.0 inches / 12 inches per foot * DA
Volume = 84500 cubic feet
. Additional volume as follows:
TOTAL REQUIRED 'TEMPORARY STORAGE
5A. 63298 Cubic feet
5B. 41818 cubic feet
5C. 47996 cubic feet
5D. 84500 cubic feet
5E. ..D cubic feet
TOTAL 237612 cubic feet
LAGOON
SHALL BE SET
6. SUMMARY
TO 59" FREEBOARD
Temporary storage period===-_--=====W======}
180
days
Rainfall during wettest period of storage==->
8.5
inches
Evaporation during storage period===--======>
0.0
inches 'f
25 year - 24 lour rainfall-==_=--_===-- ==_>
>7.5
inches
Heavy
7.5
inches
Freeboard===================================>
-1.00
feet
Side
3.0
. I
Inside top length=====-==---= =--=--==-=__-=
260.0
feet
Inside top
260.0
feet
Emergency spillway elevati.on(if planned)=-==>
46.50
feet
Top of dike elevation =======_==========_==>
47.50
feet
Bottom of lagoon elevation=======.--= ==-====>
34.50
feet
Top of sludge elevation======---=======-=-==>
36.36
feet
Total, required volume========--===========-=;
562092
cu. ft. *
Actual design volume=========--=============>
575472
cu. ft. *
Seasonal high watertable elevation (SHWT) ===>
41.50
feet
Stop pumping eleV . === ___====__=== _ = 7
44-r44i6
feet STOP PUMP ADJUSTED
Must be > or = to the SHWT e 1 e V . === = == ==>
41.50
f eet TO 41.50 FT

REVISED LAGOON FREEBOARD - LAGOON 27500B
08/24/24 Must be a or = -o min. req. treatment el.=>
Min. Required treatment volume==============>
Volume at stop pumping elevation============>
Start pumping
Must be at bottom of F.B. & 25 yr. rainfall
Act. Vol. less 25 yr. and heavy rainfall====>
Volume at start pumping elevation===========>
Required volume to be pumped==== ===--=========>
Actual, volume planned to be pumped==========>
Min. thickness of soil liner when required==3
7. DESIGNED B ` APPROVED BY:
DATE: DATE:
40.50 feet
259200 cu. ft.
259292 cu. ft.
49 .15 feet START PUMP ADJUSTED
& heavy rain T042.50FT
490972 cu. ft.
491123 cu. ft.
153112 cu. ft. *
156365 cu. ft. *
1.8 feet

Sampling protocol and schedule for Monarch sites
Date: 08/23/2024
R08.23.24
Sample collection at all sites should be done using the sampling protocol outlined below. A submittal sheet will be sent to the person in charge
of sampling prior to sampling. The respective person is responsible for print submittal forms, conducting sampling, label samples as per submittal
form, safely storing (refrigerated containers during storage) and shipping samples to the respective lab (instructions on submittal form)
Required accessories:
1. Telescopic sampler extendable to 18 feet and the pendulum beaker
2. Gloves and sampling containers
3. Ice packs.
4. Sampling submittal forms
5. Safety supplies
During sampling event two people should be responsible while supporting tasks (shipping etc.) can be conducted by the person in charge alone.

Sampling protocol for digester samples
1. Influent and effluent samples are intended to be collected for all sites from shortlisted digesters on a quarterly basis. Sampling to be
conducted by two persons at the site.
2. Label all sampling containers with respective sampling ids.
3. The influent sample must be collected from a "cleanout" just prior to entering the lagoon using the telescopic sampler and 5-gallon
bucket while following all site -specific safety policies, including Lagoon Access Safety Procedure
4. The effluent sample must be collected from the crossover pipe/wet well using the telescopic sampler and 5-gallon bucket while following
all site -specific safety policies, including Lagoon Access Safety Procedure
5. Procedure for sample collection from a Cross over pipe
a. On opening the valve on crossover pipe it is recommended to allow enough time to pass such that the standing debris in the
pipe is flushed out and a good representative sample can be collected.
b. Collect 3 x 500 mL samples using the sampler into a clean 5-gallon bucket.
c. Repeat this procedure 2 more times, while collecting all the samples into the same 5-gallon bucket.
d. Allow sufficient time between two collection events such that pipe contents are flushed.
e. At the end of the sampling event, you may have — 1.3-1.5-gallon sample, homogenize the contents of the bucket gently mixing
using the sampler and the pendulum beaker on the sampler.
6. Sampling for sample collection from a wet well or cleanout.
a. Using the telescopic sampler (beaker attached to the rod) gently homogenize contents of the wet well.
b. Collect 6-8 beakers of sample into a 5-gallon bucket from different areas of the wet well/cleanout to get a representative sample.
c. Gently homogenize the contents of the bucket.
7. Grab a sample from the homogenized mixture to fill the labeled sampling container (influent or effluent) and put the container cap
tightly ensuring a watertight seal.
8. If the samples are to be stored for more than 2 hours before shipping, store them in a refrigerator preferably 4°C or lower.
9. If refrigeration is not available use frozen icepacks to cool the samples and replace icepacks at regular intervals, store the samples in a
well -ventilated space.
10. DO NOT STORE SAMPLES IN REFRIGERATORS MEANT FOR FOOD STORAGE
11. Ship samples to the lab (details in the submittal form) to deliver overnight. Include ice packs in the shipping box to keep samples cool
during transit.

Sampling protocol for lagoon liquid samples (Secondary lagoon
1. Lagoon liquid samples are intended to be collected from all the open lagoons at every site on a quarterly basis.
2. Label all sampling containers with respective sampling ids. (Refer sample list for Sample IDs)
3. The sample must be collected from the multiple spots (6-8) in the open lagoon using the telescopic sampler and 5-gallon bucket while
following all site -specific safety policies, including Lagoon Access Safety Procedure
4. Use the 18 feet telescopic sampler to reach lagoon water surface from the berm, it is needed that the sampling in charge is accompanied
by another operator onsite for this sampling for ease of equipment handling and safety.
5. Collect 2 x 500 mL samples at each spot, using the sampler into a clean 5-gallon bucket.
6. Repeat this procedure at all 6-8 randomly chosen spots along with periphery of the lagoon, collect all the samples into the same 5-gallon
bucket.
7. At the end of the sampling event, you may have — 1.3-1.5-gallon sample, homogenize the contents of the bucket gently mixing using the
sampler and the pendulum beaker on the sampler.
8. Grab a sample from the homogenized mixture to fill the labeled sampling container and put the container cap tightly ensuring a
water/airtight seal.
9. If the samples are to be stored for more than 2 hours before shipping, store them in a refrigerator preferably 4C or lower or use frozen
icepacks to cool the samples in a small container and replace icepacks at regular intervals, store the samples is a well -ventilated space.
10. DO NOT STORE SAMPLES IN REFRIGERATORS MEANT FOR FOOD STORAGE
11. Ship samples to the lab (details in the submittal form) to deliver overnight. Include ice packs in the shipping box to keep samples cool
during transit.

Sludge survey and sampling from secondary lagoon
1. The secondary lagoon, source of sludge, will be examined for sludge levels once every four years.
2. Sludge levels in the covered digesters will be examined once every four years appropriate sludge management plans will be put in
place to keep sludge levels in the digester under control.
3. Sludge sampling, from the secondary lagoon, will be conducted during sludge management events to determine sludge
composition especially Nitrogen, Phosphorus, potassium, and other micronutrients.
4. This sampling protocol is intended to help evaluate progression of sludge level in the secondary lagoon and covered digeste and
ensure agronomic land application.
5. Sludge sampling will be conducted using a sludge judge, while sludge surveys will be conducted using sonar devices that can be
remotely controlled from the berm following all site -specific safety policies, including Lagoon Access Safety Procedure.

Recommended analysis
Table 1 Recommended tests for lagoon/digester effluent sampling
Digester effluent, secondary lagoon effluent and sludge testing
Manure package
Eff-MMDDYY
Inff-MMDDYY
Nitrogen, Ammonium Nitrogen,
Organic Nitrogen, Phosphate, Potash,
Calcium, Copper, Iron, Magnesium,
Manganese, Sodium, Sulfur, Zinc,
Moisture/Total Solids, Total Salts, pH
VS
Alkalinity
Volatile organic acids
COD
BOD5
Total testing cost
Amongst the manure package TS, Ammonium nitrogen, pH are mandatory tests and if done separately cost more than the package.
Table 2 Optional tests for lagoon/digester effluent sampling
Orthophosphate
Sulfate
Sulfide
EC
Carbon