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* Operation and maintenance cost estimates assume rehabilitation of the filter media bed surface is required after 25 years of operation. Line 36:
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Infiltration Chamber: Life Cycle Costs (view source)
Revision as of 16:54, 20 December 2022
, 2 years ago→Notes
===Notes===
===Notes===
* Designs include [[pretreatment]] through hydrodynamic separator ([[Oil and Grit Separator]]).
* Designs include [[pretreatment]] through hydrodynamic separator ([[Oil and Grit Separator]] and A "Sediment Trap" or Isolated chamber row).
* The tool calculates costs for new (greenfield) development contexts and includes costs for contractor overhead and profit, material, delivery, labour, equipment (rental, operating and operator costs), hauling and disposal.
* The tool calculates costs for new (greenfield) development contexts and includes costs for contractor overhead and profit, material, delivery, labour, equipment (rental, operating and operator costs), hauling and disposal.
** Land value and equipment mobilization and demobilization costs are not included, assuming BMP construction is part of overall development site construction.
** Land value and equipment mobilization and demobilization costs are not included, assuming BMP construction is part of overall development site construction.
** The tool adds 10% contingency and additional overhead as default.
** The tool adds 10% contingency and additional overhead as default.
* All cost estimates are in Canadian dollars and represent the net present value (NPV) as the tool takes into account average annual interest and discount rates over the 25 and 50 year operating life cycle periods.
* All cost estimates are in Canadian dollars and represent the net present value (NPV) as the tool takes into account average annual interest and discount rates over the 25 and 50 year operating life cycle periods.
* Unit costs are based on 2018 RSMeans standard union pricing.
* Unit costs are based on 2018 RSMeans standard union pricing.
* Cost for piping from roof to system, parking lot to system and overflow from system are not included in this costing.
* Costs of the control manhole and overflow, and pre-treatment via an OGS (when the facility takes road runoff) are included.
* Additional costs associated with retrofit or redevelopment contexts is assumed to be 16% of the cost estimate for new (greenfield) construction contexts.
* Additional costs associated with retrofit or redevelopment contexts is assumed to be 16% of the cost estimate for new (greenfield) construction contexts.
** Retrofit construction cost estimates are included in the 'Costs Summary' section for comparison.<br>
** Retrofit construction cost estimates are included in the 'Costs Summary' section for comparison.<br>