HomeMy WebLinkAbout820061_Sludge Survey (Testing Dates)_20191018 rIttlitIVtU
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ROY COOPER
Governor A ° - OCT 23 2019
MICHAEL S.REGAN
Secretary
LINDA CULPEPPER NORTH CAROLINA WQROS
Director Environmental Quality FAYETTEVILIPRFGIONALOFF1cE
October 18, 2019
Michael L Herring
Knotty Pine Farm
• 7520 Fiv •e Bridge Rd
Clinton,NC 28328 •
Subject: Sludge Survey Testing Dates
• Certificate of Coverage No. AWS820061
• Knotty Pine Farm
Animal Waste Management System
Sampson County
Dear Michael L Herring: * '
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 "1" at the Knotty Pine Farm 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 31,2021.
The next sludge survey for lagoon structure "1" at Knotty Pine Farm should be performed before
December 31,2021.Please retain this letter and keep it with your farm records for reference.
Please call me at(919) 707-3705 if you have any questions.
Sincerely,
Heath C. Robinson •
• Animal Feeding Operations Program •
cc: Fayetteville Regional Offi9e,Water Quality Regional Operations Section
Permit File AWS820061
D E Q
North Carolina Department of Environmental Quality I Division of Water Resources
) 512 North Salisbury Street I 1636 Mail Service Center I Raleigh,North Carolina 27699-1636
Dwastoral belnanatal jr006.4 919.707.9000
- A
Sludge.Survey Evaluation Form Today's Date . 10/18/2019
Facility# 820061
Owner: Herring
Lagoon ID
Sludge Survey.Received: 9/20/2019
Sludge Survey Performed: .. 10/17/2018 ;
Sludge:Depth(Row O):(ft) 4.8 .
Existing Treatment Depth(Row P): (ft).: 6.20
Start Date: 1/1/1998
Facility age at time of survey: 21
Average Sludge Accumulation:(ft/yr): :. . . . : . . 0.23.
Requested Extension: (yr) .. 2 .
Requested Due:Date. -.. . . . . 2021 . •
-
SludgeAccumulation during extension period: (ft) 0:46
Treatment Depth Available after Extension: (ft) 5.74 -
Sludge level OK?. . . • .'_ . '. • , -' "YES='
Ratio Estimates Based on Depth : : EXISTING.. EXEMPTION •
Ratio of Sludge-layer to total trmt depth 0.44 - 0,48
Ratio of Sludge depth OK? ...
EXISTING :- . EXEMPTION
Average Sludge layer thickness(T) - 4.8 - 5.26
Depth of the lagoon from top of bank to bottom soil surface(D) 14.6 14.6
Slope=Horizontal/vertical side slope(S) 3 3 '
Length at the top of inside bank(L) 250 250
Width at the top inside slope(W) : 225 225
Thickness of existing liquid treatment zone(Y) : ; 6.20 : 5.74
Length at midpoint of sludge layer(Lm)=L-2S(D-(T/2)) 176.80 : ...178.18
Width at midpoint of sludge layer(Wm)=W-2S(D-(T/2)) 151:80 153:18
Volume of sludge(Vs)=Lm*Wm*T: 128823.55 ' • 143,610,48
Volume in gallons:(Vsg)=Vs*7.481: 963728.99 - 1074206.43
Thickness of total treatment zone(Z)=T+Y . 11.00 11:00
Length at midpoint:of total treatment zone(Lz)=L-2(S)(D-(Z/2)) 195.40 195,40
Width at midpoint of total treatment`zone(Wz)=W-2(S)(D-(Z/2)) 170,40 170.40
Volume of total treatment zone(Vz) Lz*Wz*Z - . , : _ . - . ' 366257.76 ... 366257.76
Ratio(R)of sludge layer volume to total trmt volume :. 0.352 - 0:392.
Sludge Volume Ratio:OK?:
Maximum extension until end of permit cycle - .
Next survey to be.done: (calendaryr). 12/31/2021
Notification letter mailed:- : : 10/18/2019