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Key Design and Plan Review Considerations (view source)
Revision as of 18:41, 24 June 2022
, 1 year ago→Inclusion of Sediment Removal Plans
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For underground conveyances (i.e., catchbasins, manholes, [[pipes]]), BMPs, [[pretreatment]] devices, and in-line [[filters]], sediment removal often requires crews performing the work to enter confined spaces. Contractors or staff performing the work must have confined space entry training to satisfy occupational health and safety requirements ([https://www.ontario.ca/laws/regulation/050632#:~:text=(1)%20Every%20worker%20who%20enters,632%2F05%2C%20s. Ont. Reg. 632/05 – Confined Spaces Regulation]). <br>
How the material removed from conveyances, LID BMPs, [[pretreatment]] devices and in-line filters will be safely and sustainably managed also needs consideration. Due to the small drainage area of most LID BMPs, the rate at which they accumulate sediment and associated contaminants tends to be low in comparison to centralized stormwater treatment facilities like [[SWM ponds|stormwater ponds]] or detention chambers/tanks that receive drainage from much larger areas. As a result, the potential for sediment accumulated in LID BMPs to qualify as contaminated according to [https://www.ontario.ca/page/soil-ground-water-and-sediment-standards-use-under-part-xv1-environmental-protection-act Ontario Brownfields Regulation 153/04 standards for soil and sediment (OMOE, 2011)] is low. <br>
Most often, contractors or staff performing sediment removal maintenance procedures will be cleaning multiple BMPs and pretreatment devices at multiple sites on any given day. At the end of the day, the mixture of material collected either manually, or by vacuum equipment (e.g., regenerative air or vacuum sweeper, vacuum/soil blower truck, hydro-vac truck) will include a mixture of re-usable, recyclable and non-recyclable constituents. In order to recover reusable and recyclable materials and minimize the volume of material needing to be managed otherwise, the mixture should be screened to isolate trash (for recycling or disposal), natural debris and [[mulch]] (for composting), and [[gravel]] - to pebble-sized [[aggregates]] (for washing and re-use) from finer (i.e., [[sand]] - to [[Texture|clay-sized]]) material. The sand- to clay-sized material (i.e., material passing a 2 mm diameter ([https://www.endecotts.com/faq/sieves-and-calibration/american-standard-test-sieve-series-astm/ ASTM No. 10]) sieve) should then be assessed and managed in accordance with [https://www.ontario.ca/laws/regulation/900347 provincial regulations (O.Reg. 347)].