310400_Lagoon Repair Plan_20230510

Smithfield
Good food. -"Respon'tb(�'
May 10, 2023
North Carolina Department of Environmental Quality
Division of Water Resources
512 North Salisbury Street
1636 Mail Service Center
Raleigh, NC 27699-1636
Subject: Proposal of Dike Maintenance on Farm 3620 (31-0400)
Dear Christine Lawson:
Below is the process proposed for the dike repair at Smithfield farm 3620 for the
maintenance/restoration of the primary lagoon dike.
Recommended Dike Maintenance/Repair/Restoration:
1. Erosion on the upper portion of the dike is due to wave action on the lagoon surface over the
years. Soils from the interior dike face has eroded/sluffed/deposited along the existing waters
edge creating a visual ledge around interior of the dike.
2. The water level shall be maintained at 60" freeboard or lower for the duration of the repair
construction.
3. On the interior of the dike, remove existing overburden and liner as shown on sheet G101 being
careful to not disturb the inside slopes or existing soil liner near the lowered water level.
4. On -site soils adequate to restore the eroded dike face are not plentiful. Smithfield will bring in
appropriate soils from a barrow area at a nearby Smithfield farm.
5. With the existing liner/overburden excavated, clay material from a predetermined suitable
source shall be brought in to reestablish the liner. The clay shall be placed in small lifts a
maximum of 9" tall and then compacted to achieve 95% of standard proctor maximum dry
density. Fill the excavated area completely with compacted clay back to original design
slope/grade.
6. After completion of the dike maintenance vegetation is to be established.
7. At no time during the dike maintenance will the capacity of the lagoon be altered from the
original design.
Respectfully,
Jason E. Olmstead, P.E.
Smithfield Hog Production, LLC
Cc: Dave Elkin
Michael Norris
Engineering File

362071
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CONTROL PT #1
I.R.S.
NORTHING = 5000.00
EASTING = 5000.00 I
ELEV
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12'
WAVE EROSION
REPAIR ZONE
/
12.0 — 19.8"
CART PPUMP — 40.8"
60.0"
=PIMP — —
18.0" 87.5"
REPAIR WATER LEVEL
— — — SLUDGE LEYEL-
120.0"
FINISH GRADE SEEDING NOTES:
1. ALL DISTURBED AREAS SHALL BE SEEDED, FERTILIZED, AND MULCHED AS SOON AS POSSIBLE
AFTER FINAL GRADING IS COMPLETED.
2. PREPARE DISTURBED AREAS FOR SEEDING BY GRADING IN ALL SURFACE WATER DIVERSIONS AND
SHAPING TO FINAL GRADES.
3. APPLY LIME AND FERTILIZER THEN DISK TO PREPARE A 3 TO 4 INCH SMOOTH SEEDBED. APPLY
SEED AND FIRM SEEDBED WITH A CULTIPACKER OR SIMILAR EQUIPMENT. APPLY MULCH AND
SECURE WITH A MULCH ANCHORING TOOL OR NETTING.
SOIL AMENDMENTS:
1.0 ACRES DISTURBED AREA
1000 LBS. OF 10-10-10 FERTILIZER (1000 LBS/ACRE)
2 TONS OF DOLOMITIC LIME (2 TONS/ACRE)
100 BALES OF SMALL GRAIN STRAW (100 BALES/ACRE)
SEEDING SCHEDULE:
8 LBS. HULLED COMMON BERMUDA GRASS (8 LBS./ACRE)
60 LBS. BAHIA GRASS (60 LBS./ACRE)
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EARTHWORK CALCULATION DATA
METHOD USED: AVG
CUT FILL
DIKE LINER REPAIR GRADE 700 1700
NET FILL REQUIRED 1000
1. ALL QUANTITIES ARE IN CUBIC YARDS, AND FILL
VOLUMES HAVE BEEN ADJUSTED BY 15%.
2. FINISHED GRADE BACKFILL INCLUDES MATERIAL
USED TO CREATE PROPER DRAINAGE, WALKWAY
ELEVATIONS, AND FEEDPAD GRADES AFTER
FOUNDATION WORK IS COMPLETE.
3. BORROW AREA WILL BE LOCATED ON -SITE.
LAGOON INSET
SCALE = 1 ":100'
50
50
SD
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FP FP
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100.00
LEGEND
EXISTING CONTOUR
FINISHED CONTOUR
PVC DISCHARGE PIPE W/CLEANOUT
STORMWATER PIPE W/CATCH BASIN
MINIMUM BUILDING / LAGOON
SETBACK LINE
SWALE / DIVERSION
PAD, OFFSET
STAKEOUT POINTS
POWER POLE
RIPRAP EROSION PROTECTION
STORM WATER PIPE
FENCELINE
CONTROL POINT
EXISTING FLUSH PIPE/W CLEANOUT
POWER PANEL
FLUSH PIPE DISCHARGE
DRAINAGE INLET
PAD ELEVATIONS
CONTROL POINTS
S/W PIPE DETAILS
DISCHARGE PIPE DETAILS

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G101
SITE PLAN