310469_Report_20191018

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Director
Jack Alphin
Jack Alphin Farm 1-9
519 Bethel Church Rd
Mount Olive, NC 28365
Dear Jack Alphin:
NORTH CAROLINA
Environmental Quality
October 18, 2019
EC;IE 3f CtJG�LR�$:JO�atE'"
OCT 2 3 2019
VJater Quality Re-ional
operations section
`lei! Tlinstor,, Re°ion?I Qffics
Subject: Sludge Survey Testing Dates
Certificate of Coverage No. AWS310469
Jack Alphin Farm 1-9
Animal Waste Management System
Duplin County
The Division of Water Resources (Division) received your sludge survey information on
September 20, 2019. With the survey results, you requested an extension of the sludge survey
requirement for lagoon structure "Back" at the Jack Alphin Farm 1-9 facility. Due to the amount
of treatment volume available, and the rate of sludge accumulation for the lagoon, the Division
agrees that a sludge survey is not needed until December 31, 2024.
The next sludge survey for lagoon structure "Back" at Jack Alphin Farm 1-9 should be
performed before December 31, 2024. Please retain this letter and keep it with your farm records
for reference.
Please call me at [phone] if you have any questions.
Sincerely,
!!!Heath C. Robinson
Animal Feeding Operations Program
cc: ilxniigtci Itegi,oiial�'fc Water Quality Regional Operations Section
Permit File AWS310469
®�� North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11636 Mail Service Center I Raleigh, North Carolina 27699-1636
rmrrrti canoe wn
919.707.9000

Lagbpn,ID Back.'..
ff S'U dge SU
Fa
Owne
Existing Treatment Depth (Row P.): (ft) 5.00-
SI
Facility age at time of surve'y:(yr) 36
Average Sludge Accumulation. (ft/yr): 0.04
Requested Extension: -(yr) 5
Treatment Depth Available after Extension: (fi) 4.82
Sludge level.OK..
Ratio Estimates Based on Depth EXISTING EkEMPTION
Ratio of Sludge layer to total trmt depth.
Ratio of -Sludge depth 0K9
Average Sludge layer thickness (T) 1.3 1.48
Depth of the lagoon from top of bank to bottom soil surface (D) 9.9 9.9
Length at the top of inside bank (L) 370 370
Width at the top inside slope (VV) 1110 110
Length at midpoint of sludge layer (Lm)=L-2S(D-(T/2)) 323.35 324.20
Width at midpoint of sludge layer (Wm)=W-2S(D-(T/2)) 63.75 64.20
Thickness of total treatment zone (Z)=T+Y 6.30 6.30
Length at midpoint.6f . total treatment zone (Lz)=L-2(S)(D-(Z/2)) 336.25 33625
Width at midpoint -of total treatment zone (Wz)=W-2(S)(D-(D2)) 76.25 76.25
10
pe
Le g
th
at
t at
es
th
kn
th
Width at mjdp
Ratio(R) of sludge layer volume to total trmt volume 0.166 0391..
Sludge Volume Ratio OK?
Maximum extension until end of permit cycle
Next survey to be done: (calendar yr)- 12/31/2024
Notification letter mailed:. 10/18/2019
OCT
�� ?0i�
--��°^...
water Qun|ih, Pedonal
upemwv
OCT
�� ?0i�
--��°^...
water Qun|ih, Pedonal
upemwv