Best Management Practices for New Developments and Redevelopments. Any construction contractor performing work in the city shall implement appropriate BMPs to prevent the discharge of construction wastes or contaminants from construction materials, tools and equipment from entering the storm drains.
All construction plans and applications for building permits shall consider the potential for erosion and sedimentation at the construction site and shall include appropriate erosion and sedimentation controls. Appropriate controls shall be determined in accordance with the guidance provided in the CALTRANS handbook, CASQA BMP Manual or similar technical manual and may include site planning considerations, construction staging and timing, and installation of temporary detention ponds or other treatment facilities.
Prior to and/or during construction, the director of public works may establish controls on the volume and rate of stormwater runoff from new developments and redevelopments as may be appropriate to minimize peak flows or total runoff volume. These controls may include limits on impervious or area provisions for detention and retention of runoff on site.
All development projects shall comply with the post-construction requirements of the MS4 General Permit, Section E.12, Post-Construction Storm Water Management Program, which may include measures for site design, source control, runoff reduction, stormwater treatment, or baseline hydro modification management as applicable based on project type and size. Information related to these measures can be found in the Humboldt Low Impact Development Stormwater Manual. The city shall incorporate MS4 General Permit post-construction requirements, as applicable, in any land use entitlement and construction or building-related permit to be issued relative to such development. The responsible party and developer shall comply with the terms, provisions, and conditions of such land use entitlements and permits.
"MS4" or "municipal separate storm sewer" means a conveyance or system of conveyances (including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, man-made channels, or storm drains): (1) owned or operated by the city that discharges into waters of the United States; (2) designed or used for collecting or conveying stormwater; (3) which is not a combined sewer; and (4) which is not part of a publicly owned treatment works (POTW) as defined in the United States Code of Federal Regulations at 40 CFR
122.2.
"MS4 General Permit" means the State Water Resource Control Board NPDES General Permit No. CAS000004 – Waste Discharge Requirements for Stormwater Discharges from Small MS4s, issued by Water Quality Order No. 2013-0001-DWQ on February 5, 2013, a copy of which is on file with the city clerk.
The director of public works may require, as a condition of project approval, permanent structural controls designed for the removal of sediment and other pollutants. The selection and design of such controls shall be in accordance with criteria established or recommended by state and federal agencies.