ORD 2168 - Laserfiche WebLink

1. The NPDES MRP Permit design requirements include, but are not limited to, the following: a. Source control, site design measures, and design and implementation of stormwater treatment measures are required when commercial, industrial or residential development creates and/or replaces 10,000 square feet or more of impervious surface, including roof area, streets and sidewalk. b. Hydro-modification standards are required when a new development or redevelopment project creates and replaces total impervious area of one acre or more. c. The NPDES Permit requires a proactive Diazinon pollutant reduction plan (aka Pesticide Plan) to reduce or substitute pesticide use with less toxic alternatives. d. The NPDES Permit requires complying with the Copper Pollutant Reduction Plan and the Mercury Pollutant Reduction Plan. 2. The following requirements shall be incorporated into the project: a. The project developer shall submit a final grading and drainage plan prepared by a licensed civil engineer depicting all final grades and on-site drainage control measures including bio-swales. Irrigated bio-swales shall be redesigned as needed to the satisfaction of the City Engineer to optimize the amount of the stormwater running off the paved surface that enters the bio- swale at its most upstream end. This plan shall be subject to the review and approval of the City Engineer prior to the issuance of any building permits. b. In addition to natural controls the project developer may be required to install a structural control, such as an oil/water separator, sand filter, or approved equal (on-site) to intercept and pre-treat stormwater prior to reaching the storm drain. The design, locations, and a schedule for maintaining the separator shall be submitted to the City Engineer/Chief Building Official for review and approval prior to issuance of building permits. The structural control shall be cleaned at least twice a year: once immediately prior to October 15 and once in January. c. The project developer shall submit sizing design criteria to treat stormwater runoff and for hydromodification, if required, at the time of PUD plan submittal and an updated detailed copy of calculations with subsequent submittals. d. Landscaping shall be designed to minimize irrigation and runoff, promote surface infiltration where appropriate and acceptable to the project soils engineer, and minimize the use of fertilizers and pesticides that can contribute to stormwater pollution. I. Structures shall be designed to prohibit the occurrence and entry of pests into buildings, thus minimizing the need for pesticides. II. Where feasible, landscaping shall be designed and operated to treat stormwater runoff. In areas that provide detention of water, plants that