Siting Requirements for Permanent Nutrient Storage Facilities
Table of Contents
A permanent nutrient storage facility is a structure that stores agricultural source materials (ASM) and non-agricultural source materials (NASM), referred to as prescribed material. Figure 1 shows one type of structure for containing liquid manure.
Examples of ASM include manure, milkhouse washwater and runoff. Examples of NASM include various food processing plant by-products and biosolids. ASM and NASM are good sources of crop nutrients when properly managed and responsibly applied. Nutrients can become a contaminant if they come into contact with surface or groundwater, or if they cause an adverse effect. Components of ASM and NASM that can cause problems include:
The purpose of Ontario Regulation 267/03 under the Nutrient Management Act, 2002, is to reduce the potential for this type of pollution. O. Reg. 267/03 regulates the location and construction of permanent nutrient storage facilities, including earthen nutrient storage facilities. This Factsheet examines location considerations involving surface water, wells and neighbouring homes. The Resources section at the end of this Factsheet lists reference material that addresses construction standards for solid and liquid nutrient storage facilities. See www.ontario.ca/omaf for additional information.
Figure 1. A fenced, reinforced concrete permanent nutrient storage facility built to contain manure and other prescribed material from a livestock operation.
The Regulation applies primarily to operations required to have a nutrient management strategy (NMS), a nutrient management plan (NMP) or a NASM plan. It details requirements for minimum setback distances to various features when constructing or expanding a permanent nutrient storage facility.
A properly located and constructed permanent nutrient storage facility will keep nutrients from entering surface and/or groundwater.
Contamination of water wells is a serious threat on any farm that stores nutrients. The most practical steps to reduce this threat include:
Test your well water for bacterial contamination and nitrate several times per year to assess its quality.
Minimum Distance From Wells
Drilled well - O. Reg. 267/03, s. 63 (1) a
All permanent nutrient storage facilities must be a minimum of 15 m from a drilled well that has a depth of at least 15 m and a watertight casing to a depth of at least 6 m below ground level.
Municipal well - O. Reg. 267/03, s. 63 (1) b
All permanent nutrient storage facilities must be a minimum of 100 m from a municipal well.
All other wells - O. Reg. 267/03, s. 63 (1) c and d
All permanent nutrient storage facilities designed to store ASM must be a minimum of 30 m from any other well.
All permanent nutrient storage facilities designed to store NASM must be a minimum of 90 m from any other well.
Field drainage tiles near a permanent nutrient storage structure are a potential pathway for leaks or spills of nutrients to be transported to surface water. Subsurface tiles always outlet into ditches and/or drains that eventually empty into surface water.
When building or expanding a permanent nutrient storage facility:
Figure 2 shows an observation and shut-off station and its shut-off valve, which allows an operator to inspect for contamination, contain liquid and take remedial action if contamination is detected.
Figure 2. An observation and shut-off station provides access to a perimeter drain if required, allowing an operator to stop any contaminated flow.
Locate all new or expanding permanent nutrient storage facilities so they have a flow path length of at least 50 m to the top of the bank of the nearest surface water. [O. Reg. 267/03, s. 63 (3)]
In the Regulation, "surface water" is defined as:
The following are not considered surface water for the purposes of the Regulation:
In the Regulation, "top of bank to a surface water" means:
"Flow path," in relation to a permanent nutrient storage facility, means a surface channel or depression that conducts liquids away from the facility. [O. Reg. 267/03, s. (1)]. Flow path does not necessarily follow a straight line, as illustrated by Figure 3.
Figure 3. A flow path does not always follow a straight line. The required flow path is used to provide opportunities for flow control in the event of a spill.
Include a flow path of at least 50 m between a permanent nutrient storage facility and surface water or any tile inlets or catch basins, e.g., hickenbottom (Figure 4). These surface drainage structures often represent a direct conduit to surface water.
Figure 4. A catch basin used to drain surface water.
When siting and designing a permanent storage, consider the risk of a spill due to a fracture or break in an above-ground wall section. Under the Regulation, an engineer can reduce such risk by increasing the strength of the structure and/or by specifying that the landscape features around the storage facility are adequate to ensure secondary containment of all liquid contained in the structure above the surface of the soil. [O. Reg. 267/03, s. 76. (1)]
Locate all permanent nutrient storage facilities above the 1-in-100-year flood line established by the municipality or by the local conservation authority. [O. Reg. 267/03, s. 63 (4)]
Check with the municipality or local conservation authority if the site is close to a river or stream or to verify flood lines.
Under the Regulation, new or expanding permanent liquid nutrient storages that will contain liquid agricultural source material (e.g., liquid manure, runoff or milkhouse washwater) must maintain separation distances to bedrock and groundwater (aquifer). To provide this protection, a professional engineer or geoscientist must carry out a geotechnical investigation.
The same applies to new or expanding permanent solid nutrient storage facilities on a farm unit where the facility does not have a concrete floor and will be used to store agricultural source material, and where the animals on the farm will generate 300 or more nutrient units per year.
Geotechnical investigation requirements for NASM storage are summarized in OMAF Factsheet, Storage of Non-Agricultural Source Materials (NASM) in a Permanent Storage Facility, Order No. 12-069.
For more detailed information on geotechnical investigation, see the Regulation and OMAF Factsheet, Site Characterization Study for the Construction of Permanent Nutrient Storage Facilities, Order No. 08-049.
To avoid odour complaints from neighbours and other neighbouring land uses, follow the siting formula called the Minimum Distance Separation (MDS) when building or expanding any of:
While MDS calculations are not required by the NMA Regulation, many local municipalities require them. It suggests distances to the nearest lot line, road allowance, neighbour's dwelling and residential areas.
The required separation distance varies according to several criteria, including type of livestock, size of farm operation, type of manure system and neighbouring land use. See OMAF Publication 707, Minimum Distance Separation (MDS) Formulae Implementation Guidelines, for more information.
Contact your local municipal office for a calculation of the required minimum separation distances for any proposed nutrient storage facility, new livestock building or anaerobic digester.
MDS does not apply to a permanent nutrient storage facility intended to store NASM. However, NASM with the highest odour detection threshold (i.e. Odour Category OC3) cannot be stored in a permanent nutrient storage facility overnight; it must be applied by midnight the day it is received at the farm. NASM with a lower detection threshold (i.e. OC1 and OC2) may be stored in a permanent nutrient storage facility, provided that, if built after January 1, 2011, it is designed by a professional engineer to minimize odour emission. [O. Reg. 267/03, s. 81.4 (6)]
For more information on NASM storage, see the OMAF Factsheet, Storage of Non-Agricultural Source Materials (NASM) in a Permanent Storage Facility, Order No. 12-069.
Source Protection Plans, which are under development by local Source Protection Committees, may have additional requirements for the siting of nutrient storage facilities. When completed and approved, more details about additional requirements will be available from local Conservation Authorities and municipalities.
To finalize the location of any new permanent nutrient storage facility, prepare a scale drawing of the farmstead, allowing for access by large equipment and providing unrestricted traffic flow for hauling material in and/or out of the storage area. Also, always consider future growth build in a location that will not obstruct or limit barn expansion. Figure 5 shows separation distances to consider when planning a new barn with an under-barn nutrient storage, including MDS.
Figure 5. Property sketch showing separation distances for a proposed permanent manure storage.
A well-maintained farmstead and reasonable consideration of the neighbours' ability to enjoy their property has a significant bearing on the community's attitude toward your operation. Prevailing summer breezes can carry odours from the storage area. Consider visually screening permanent nutrient storage facilities. Often a treed windbreak or other visual screening can aesthetically benefit both the farmstead and neighbouring properties.
All nutrient management strategies and NASM plans require a contingency plan to address situations that could potentially result in an adverse effect. [Nutrient Management Protocol, Part 12]
Preparing and implementing a contingency plan to reduce the effects of a spill is a responsibility of all farm operators. For more information, see OMAF publication BMP14, Best Management Practices: Nutrient Management Planning and BMP23, Application of Municipal Sewage Biosolids to Cropland.
Ensure that all farm staff and family are aware of the contingency plan and where to find it in case of a spill.
A properly located and constructed permanent nutrient storage facility is a first step for keeping nutrients from entering surface and/or groundwater.
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