6022_Wallace_odorplan_20200220

WALLACE FARM, INC.
HUNTERSVILLE SOLID WASTE COMPOST FACILITY
ODOR CONTROL PLAN
FEBRUARY 2020
PREPARED FOR:
WALLACE FARM, INC.
14410 EASTFIELD ROAD
HUNTERSVILLE, NC 28078
[phone]
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+ Blended Top Soil
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Ph: 704-875=2975
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Craig Fortner, P.E.
Professional Engineer
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Pick-up or Oelivery
14410 Easllielrl iid . s lt,r ' �r ;� i;,tY. 1NC: 8078
PREPARED BY:
GARRETT Ep!22
MORE.j
Engineering for the Power and Waste industries
206 High House Road, Suite 259
Cary, North Carolina 27513 • O: 919-792-1900 • F: 866-311-7206
NC FIRM C-2910

WALLACE FARM, INC.
CONTENTS
HUNTERSVILLE SITE
ODOR CONTROL PLAN
1.0 INTRODUCTION................................................................................................................. 1
2.0 POTENTIAL ONSITE ODOR SOURCES............................................................................ 1
3.0 ONSITE WEATHER CONDITIONS..................................................................................... 1
4.0 ODOR MONITORING PLAN............................................................................................... 2
5.0 ODOR COMPLAINT PROTOCOL AND RECORD KEEPING ............................................. 3
6.0 ODOR CONTROL DESIGN AND BEST MANAGEMENT PRACTICES .............................. 5
6.1 PERSONNEL TRAINING................................................................................................. 5
6.2 FEEDSTOCK CHARACTERISTICS................................................................................ 5
6.3 RECEIVING..................................................................................................................... 6
6.4 MIXING............................................................................................................................ 6
6.5 WINDROW CONSTRUCTION AND OPERATIONS........................................................ 7
6.6 WEATHER CONSIDERATIONS...................................................................................... 7
GARRETT ■
& moou
Engineering forth Power and Waste Industries

WALLACE FARM, INC.
HUNTERSVILLE SITE
ODOR CONTROL PLAN
1.0 INTRODUCTION
This Odor Control Plan was developed for Wallace Farm, Inc. in accordance with Rule 15A
NCAC 13B .1405 (10). The objective of the plan is to provide guidance for operators and outline
required activities so that the facility: (1) operates in accordance with state regulations, (2)
minimizes external odor impacts, and (3) composting is undertaken with proper practices to
reduce odors.
2.0 POTENTIAL ONSITE ODOR SOURCES
Rule 15A NCAC 13B .1405 (10) (a) requires an identification of all onsite odor sources. The
following sections cover standard operating procedures for the facility. Odors at the facility,
when observed, are typically located near and associated with the following portions of the
operation:
1. Mixing and Receiving Area
2. Active Compost Windrow Areas
3.0 ONSITE WEATHER CONDITIONS
Seasonal variations experienced at the facility are consistent with the North Carolina piedmont,
characterized by hot and humid summers and cold and wet winters. 70+ years of prevailing
wind data at Charlotte Douglas International Airport indicate an average wind direction of 286°,
or generally westerly winds as shown on the following figure:
GARRETT �■ Page 1 of 7
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WALLACE FARM, INC.
Wind Rose for Douglas International Airport (KCLT)
Jan. 1, 1948 to Feb. 19, 2020
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Direction of Maximum Wind
288 degrees
113 degrees
Figure 1 — Wind Rose for Douglas International Airport
HUNTERSVILLE SITE
ODOR CONTROL PLAN
Site topography generally falls to the southeast from the facility entrance on Eastfield Road.
4.0 ODOR MONITORING PLAN
Wallace Farm utilizes an odor monitoring plan that consists of frequent record keeping. When
adverse odors are recognized, records are kept of the following:
• Odor source;
• Detected odor location;
• Date/time;
• Weather conditions, including wind direction; and
• Odor characteristics and intensity.
All records are maintained onsite.
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WALLACE FARM, INC. HUNTERSVILLE SITE
ODOR CONTROL PLAN
5.0 ODOR COMPLAINT PROTOCOL AND RECORD KEEPING
Procedures for responding to odor complaints are detailed in this section. Odor complaints can
be called in or e-mailed to the Wallace Farm office.
If a complaint is received, the following steps are taken:
1. A member of Wallace Farm office staff promptly visits the complaint location.
2. Upon arrival, Wallace Farm staff member completes an Odor Response Form.
3. The Wallace Farm staff member determines if complaint is verifiable.
4. If the complaint is not verifiable, the staff member returns to the office and files the
completed Odor Response Form.
5. If the complaint is verifiable, the Wallace Farm staff member immediately contacts the
compost facility manager.
6. The compost facility manager promptly investigates to identify the odor source.
7. Corrective Action is implemented immediately.
8. A weather data sheet is attached to the odor response form located in the Operation
and Maintenance Plan and filed.
Presented graphically, the Odor Complaint Protocol can be found in Figure 2.
GARt'age 7
RETT ■
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Engineering For the Power and Waste Industries

WALLACE FARM, INC.
Odor complaint
is received
Wallace Farm
staff member
promptly visits
addressflocation
Wallace Farm
fills out Odor
Response Fomn
Was complaint
verifiable? No
File Odor
Response Form
Yes
Compost facility manager
promptly investigates to identify
odor source and take
corrective action
Figure 2 — Odor Complaint Protocol
GARRETT ■
& MOORE
Engineering For the Power and Waste Industnes
HUNTERSVILLE SITE
ODOR CONTROL PLAN
Page 4 of 7

WALLACE FARM, INC.
6.0 ODOR CONTROL DESIGN AND BEST MANAGEMENT PRACTICES
6.1 PERSONNEL TRAINING
HUNTERSVILLE SITE
ODOR CONTROL PLAN
Wallace Farm managers and staff associated with mixing and windrow operations will be
trained in odor control best management practices. Appropriate staff are trained to identify
and correct the conditions tabulated below:
Problem/Condition
Corrective Action
Odors around compost pad, or off -site odors
-Check for/clean up spills. Cover odorous
windrows with compost or carbonaceous blend. -Do
not disturb odorous windrow for approximately 10
days following initial turning.
-Check incoming feedstocks.
Odors during pile turning
-Adjust as necessary the initial mix C:N ratio, pH,
porosity and/or water content of mix.
-Avoid turning during adverse atmospheric
conditions, if possible.
Odor complaint from neighbor
Follow procedures noted below and in the next
section, including:
1. Respond immediately
2. Complete Odor Response Form
3. Determine whether corrective action is
needed.
4. If needed, perform immediate corrective
action to address odors
5. Cover odorous windrows with a layer of
carbonaceous materials.
6. Check incoming feedstocks.
7. Consult on -site weather station.
6.2 FEEDSTOCK CHARACTERISTICS
Allowable feedstocks are listed in the Operations and Maintenance Manual. Allowable
feedstocks include: animal manure, woody waste, yard waste, cotton crop material, meat,
food waste, grease trap residuals, U. S. domestic tobacco crop residues, cardboard,
bleaching clay, animal fats, virgin gypsum board, lime and starch water. These feedstocks
are ideal as either a source of organic matter and nutrients required in a compost operation
or as a bulking material that adds porosity to the mass of material composted.
The most critical of the assessments for the feedstock materials is the carbon, nitrogen and
phosphorus level. The C:N and C:P ratios are important in operation of compost systems.
Review of the feedstock quality and the quality of the finish product suggest the C:N and C:P
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WALLACE FARM, INC.
HUNTERSVILLE SITE
ODOR CONTROL PLAN
ratios are suited to generate high quality compost. Optimum C:N ratio for compost is between
20:1 and 40:1. Ratios below the 20:1 often generate adverse odor. C:N ratios over 40:1 may
slow the composting process. The feedstock blends should be monitored periodically to
insure the C:N ratios remain within this optimum range.
The feedstocks permitted for the operation are all well suited to composting. All of the organic
materials are high in energy value and are well suited for the operation. The nitrogen and
phosphorus rich materials (tobacco and cotton waste, food processing waste and food waste)
are all well suited for the operation. The list of feedstocks suggest the materials currently
permitted at the facility are high in organic carbon, additional nutrient rich (N, P, and K)
materials would improve the quality of the end product and the management at Wallace might
examine additional N and P sources.
Wallace Farm staff are trained in mixing incoming feedstocks to maintain a carbon:nitrogen
(C:N) ratio between 20:1 and 40:1. C:N ratios below 20:1 are often generate adverse odor.
6.3 RECEIVING
All materials received pass through the weigh station and the material is logged into the
facility. Inert materials such as noncommercial yard and leaf waste, landscape waste and
other typically residential wastes are diverted to a receiving area specified for these
landscape wastes. Individual homeowners typically deliver to this area. In addition, Wallace
Farm employees collect ground, chipped or shredded yard waste from facilities throughout
the service area and these inert woody wastes are diverted to a staging area for use as
bulking material/carbon sources in the compost operation. A third category of incoming
vegetative waste consists of dry agribusiness residues such as cotton waste or tobacco
processing residues. Each of these dry sources is ultimately used in the compost operation
and these materials pose no significant aesthetic concerns when used in a timely manner.
The second phase of the receiving operation involves the dispersal of the commercial
potentially putrescible materials into the operation. These materials are directed from the
incoming weigh station directly to the mix pit. The individual vehicle operators discharge
these materials directly into the pit along the proximal portion of the pit against the concrete
push wall. These materials typically consist of food waste, FOG waste, and food processing
residuals. Vehicle operators do wash the tank and trailer beds prior to leaving the facility;
these wash -down products are introduced into the mix -pit. The mix -pit barrier wall is open
along portions of the structure to allow wash -down materials that may have fallen on the
receiving pad to wash into the pit. Vehicle operators are responsible for cleaning the pad if
necessary.
6.4 MIXING
Mix Pit operations are well developed and incorporation of these potentially putrescible
materials into the leafy organics and woody waste is routine. These practices have been
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WALLACE FARM, INC.
HUNTERSVILLE SITE
ODOR CONTROL PLAN
refined to minimize adverse aesthetic consequences and help to control odor in the facility.
Operators utilized a lift and drop procedure to assure the incoming material is thoroughly
mixed and blended. This assures the material will compost well and controls odor.
In addition to this procedure for incorporating the materials, the operator incorporates wood
ash into the mix and the organic carbon acts as activated charcoal to hold and trap odor.
Mixed and blended materials are transported continuously from the pit to the compost area
until the various feedstocks proposed for composting have been removed. Placing these
materials into the windrows promptly reduces potential for odor and insects at the pit.
6.5 WINDROW CONSTRUCTION AND OPERATIONS
Compost feedstocks produced through the mixing and blending operation are transported to
the windrow. The vehicle operators place the feedstock at a designated location in the
compost area and once windrow construction is initiated, the operators place additional
materials in the windrow until the desired windrow length is achieved. Windrows measure
approximately 5 feet in height and 16 to 20 feet in width. Windrow length will vary depending
on the location in the windrow area.
Once a windrow is established, woody material (sawdust, ash, wood chips) is spread over
the windrow using a modified Knight Spreader. The spreader has been modified to gently
place this odor scrubbing layer along the outer edge of the windrow rather than sling the
material as is typical with a Knight Spreader. This practice is unique to Wallace Farm and
reflects concern for neighbors.
The windrow is turned initially following construction typically within a few days to assure
materials are thoroughly mixed and blended. These are standard practices in the operation
of a windrow operation.
Windrows are operated in accordance with the Operation and Maintenance Plan.
Procedures used to minimize odors at the windrow areas include covering the windrows with
finished compost and/or woody material. Staff minimize the amount of standing water around
the rows to further minimize odor production.
6.6 WEATHER CONSIDERATIONS
Wallace Farm staff are trained to minimize odors and seek to operate odor -producing
processes during favorable weather conditions. Composting operations are suspended
during excessively wet weather and during times when prevailing winds are unfavorable.
During normal operations, facility staff avoid windrow turning operations during the early
morning and after approximately 3:00 PM when typical conditions are favorable to odor
transport.
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Engineering For the Power and Waste Industnes