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Key Design and Plan Review Considerations (view source)
Revision as of 13:59, 29 June 2022
, 2 years agono edit summary
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==Overview==
==Overview==
Designing LID BMPs with ease of inspection and maintenance in mind is critical to the affordability of municipal stormwater infrastructure asset management programs and must be considered early on in the overall activity. Generally this occurs during the design and an early stage in the plan review and approval process. The following sections provide tips on tailoring the design of LID BMPs to help reduce the frequency of structural repairs and make inspection and maintenance tasks easier and cheaper to perform by either municipal staff or hired external consultants.
Designing LID BMPs with ease of inspection and maintenance in mind is critical to the affordability of municipal stormwater infrastructure asset management programs and must be considered early on in the overall activity. Generally this occurs during the design and an early stage in the plan review and approval process. The following sections provide tips on tailoring the design of LID BMPs to help reduce the frequency of structural repairs and make inspection and maintenance tasks easier and cheaper to perform by either municipal staff or hired external consultants.
====1. Leachate Test====
====1. Leachate Test====
As required by [https://www.ontario.ca/laws/regulation/900347 O.Reg. 347], testing of leachate toxicity by the Toxicity Characteristic Leaching Procedure (TCLP), establishes whether or not the sediment is hazardous waste, which would then require proper disposal at a hazardous waste facility. The TCLP uses an acetic acid solution designed to simulate a possible worst-case leaching conditions scenario that could occur on a given study site that contains contaminated soils, or any other organic matter that will degrade over time (putrefaction) (Intrakamhaeng, et al. 2019<ref>Intrakamhaeng, V., Clavier, K.A., Roessler, J. G., and Townsend, T. G. 2019. Limitations of the toxicity characteristic leaching procedure for providing a conservative estimate of landfilled municipal solid waste incineration ash leaching, Journal of the Air & Waste Management Association, 69:5, 623-632, DOI: 10.1080/10962247.2019.1569172</ref>. This information is typically required by the MECP as a key first step in characterizing sediment. It may be advisable to conduct this analysis concurrently with Step 2 ([https://www.ontario.ca/laws/regulation/040153 O.Reg. 153/04 Bulk Soil Analysis]) so that samples for both tests can be collected during the same visit.
As required by [https://www.ontario.ca/laws/regulation/900347 O.Reg. 347], testing of leachate toxicity by the Toxicity Characteristic Leaching Procedure (TCLP), establishes whether or not the sediment is hazardous waste, which would then require proper disposal at a hazardous waste facility. The TCLP uses an acetic acid solution designed to simulate a possible worst-case leaching conditions scenario that could occur on a given study site that contains contaminated soils, or any other organic matter that will degrade over time (putrefaction) (Intrakamhaeng, et al. 2019<ref>Intrakamhaeng, V., Clavier, K.A., Roessler, J. G., and Townsend, T. G. 2019. Limitations of the toxicity characteristic leaching procedure for providing a conservative estimate of landfilled municipal solid waste incineration ash leaching, Journal of the Air & Waste Management Association, 69:5, 623-632, DOI: 10.1080/10962247.2019.1569172</ref>. This information is typically required by the MECP as a key first step in characterizing sediment. It may be advisable to conduct this analysis concurrently with Step 2 ([https://www.ontario.ca/laws/regulation/040153 O.Reg. 153/04 Bulk Soil Analysis]) so that samples for both tests can be collected during the same visit.
====2. O.Reg. 153/04 Bulk Soil Analysis ====
Bulk soil analysis based on the [https://www.ontario.ca/laws/regulation/040153 O.Reg. 153/04 Standard] is carried out to evaluate whether sediment is suitable for beneficial use or requires landfill disposal. The OMOECC has, on a case-by-case basis, accepted the contaminant thresholds in O.Reg. 153/04 Table 1 as a basis for classifying sediment as
inert. Inert sediment can be used off-site without regulatory approval. Sediments that exceed Table 1 soil standards would require a risk evaluation to identify potential beneficial use options according to the figure to the right. <br>
The following is a base list of bulk soil analytes to be tested. It may be necessary to include additional analytes if land use activities in the CDA or past spills are believed to have introduced contaminants that are listed in the Standards but not included in this list.
*Trace metal scan including hot water extractable boron
*Cyanide
*Polycyclic Aromatic Hydrocarbons (PAHs)
*Petroleum Hydrocarbons (PHCs)
*Sodium Adsorption Ratio (SAR)
*Electrical Conductivity (EC)
*Particle Size Distribution (PSD)
==References==
==References==