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HomeMy WebLinkAbout3004_Wallace_OdorPlan_20200220WALLACE FARM, INC. DAVIE COUNTY LARGE TYPE 3 COMPOST FACILITY ODOR CONTROL PLAN FEBRUARY 2020 PREPARED FOR: WALLACE FARM, INC. 14410 EASTFIELD ROAD HUNTERSVILLE, NC 28078 (704) 875-2975 -Exporionc * Me Dilfownce , ........ Soo Us For All Your Sal r+ mIs + Blended Top Soil + Composted Cow Manure * Compost plus Ph: 704-875=2975 t:.IY' 704-875-23N 0%%111111111,/0 4 SEAL 029929 : _ OX&GI1Vt A# § ' Craig Fortner, P.E. Professional Engineer + Petling Soil + Play Sand ♦ Hardwocd M ll1v + Pino Nnriles Bijlk & Bagged 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 DAVIE COUNTY 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. DAVIE COUNTY 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. 20+ years of prevailing wind data at Winston-Salem Smith Reynolds Airport indicate an average wind direction of 327°, or generally northwest winds as shown on Figure 1. GARt'age 7 RETT ■ & MOORE I Engineering For the Power and Waste Industries WALLACE FARM, INC. DAVIE COUNTY SITE ODOR CONTROL PLAN Wind Rose for Smith Reynolds Airport (KINT) Dec. 1, 1998 to Feb. 20, 2020 Calm Winds:2105 % N Wind Speed { mph } �11 22+ t � x 16-22 ' J0 //o 11-16 4 � ■ i f • f 7-11 r ' } 4-7 r t e t G-4 � F ----- + ------ E r 1 � 1 4 / � � k Average Wind Speed {{ �t Maximum Wind Speed 5.32 mph f ' t 34 mph r ' � Average Wind Direction F Direction of Maximum Wind 327 degrees 320 degrees Figure 1 — Wind Rose for Smith Reynolds Airport Site topography generally falls to the north in the central portion of the property, and generally west in the windrow and product storage area. 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: ��ETT 112 Page 2 of 7 & MOORE Engineering For the Power and Waste Industries WALLACE FARM, INC. • Odor source; • Detected odor location; • Date/time; • Weather conditions, including wind direction; and • Odor characteristics and intensity. All records are maintained onsite. 5.0 ODOR COMPLAINT PROTOCOL AND RECORD KEEPING DAVIE COUNTY SITE ODOR CONTROL PLAN 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. GARRETT ■ & MOORE Engineering For the Power and Waste Industnes 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 DAVIE COUNTY SITE ODOR CONTROL PLAN Page 4 of 7 WALLACE FARM, INC. 6.0 ODOR CONTROL DESIGN AND BEST MANAGEMENT PRACTICES 6.1 PERSONNEL TRAINING DAVIE COUNTY 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 GAFMTTZ)FPage 5 of 7 & MOOU Engineering For the Power and Waste Industnes WALLACE FARM, INC. DAVIE COUNTY 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 GAFMTT Z:A2 Page 6 of 7 & MOOU Engineering For the Power and Waste Industnes WALLACE FARM, INC. DAVIE COUNTY 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. GARRETT E�AP2 Page 7 of 7 & MOORE Engineering For the Power and Waste Industnes