Changes

* Operation and maintenance cost estimates assume rehabilitation of the filter media bed surface is required after 25 years of operation.

* Operation and maintenance cost estimates assume rehabilitation of the filter media bed surface is required after 25 years of operation.

* 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.  

** Mobilization and demobilization costs are not included, assuming BMP construction is part of overall development site construction with equipment needed already on-site.

** Land value and equipment mobilization and demobilization costs are not included, assuming BMP construction is part of overall development site construction with equipment needed already on-site.

** Design and Engineering cost estimates are not calculated by the tool and must be supplied by the user.

** Design and Engineering cost estimates are not calculated by the tool and must be supplied by the user.

** The tool adds 10% contingency and additional overhead as default.

** The tool adds 10% contingency and additional overhead as default.