Lincoln Municipal Code Art. IV Design Standards

To prevent the adverse impacts of storm water runoff, the city will develop a set of performance standards that must be met at new development sites that fall within one of the applicable categories defined in Section 8.60.040.

Unless a development is determined by the city to be exempt or is granted a waiver, the following design standards shall be addressed for storm water management at all sites. When a site development plan is submitted that is a redevelopment project as defined in Section 8.60.030 of this chapter, decisions on permitting and on-site storm water requirements shall be determined by the city. This criterion is dependent on the amount of impervious area created by the redevelopment and its impact on water quality. Final authorization of all redevelopment projects will be determined after a review by the city.

(1) A storm water management plan must be prepared and submitted for approval by the city that indicates how the design standards identified in this section will be complied with. The plan must illustrate sufficient engineering analysis to show that the proposed storm water management measures are capable of controlling runoff from the site in compliance with a method deemed acceptable by the city.

(2) Post-development peak storm water runoff discharge rates shall not exceed the estimated pre-development rate for developments where the increased peak storm water discharge rate will result in increased potential for downstream erosion.

(3) All storm water runoff generated from new development which meets the stated criteria in section 8.60.140 may not discharge untreated storm water directly into a jurisdictional wetland or local water body without adequate treatment.

(4) All developments that meet the criteria of this chapter must be designed in a manner that minimizes, to the maximum extent practicable, the discharge of pollutants and non-storm water discharges.

(5) All developments that meet the criteria of this chapter must consider both treatment control and source control measures as defined by this chapter. All developments must maximize infiltration and groundwater recharge to the maximum extent practicable.

(6) Sites shall be designed in a manner that limits clearing and grading to the minimum amount needed to build lots, allow access, and provide fire protection.

(7) Site layouts must be designed in a manner in which maximizes vegetation.

(8) Treatment control selection and design must be approved by the city of Lincoln.

(9) All treatment control measures must be designed per design criteria deemed acceptable by the city.

(10) All storm water treatment facilities based on volume design shall be sized using the urban runoff quality management method (the 85th percentile capture ratio volume based treatment control sizing method) as set forth in the American Society of Civil Engineers (ASCE) Manuals and Report on Engineering Practice No. 87 or by another method approved by the city.

(11) All outdoor waste management areas must be designed in a manner that minimizes the potential for pollutants and/or waste to come in contact with storm water runoff and minimizes the potential for polluted storm water discharges.

(12) All outdoor material storage areas must be designed in a manner that minimizes the potential for pollutants to come in contact with storm water runoff and in a manner that minimizes the potential for polluted storm water discharges.

(13) All new drain inlets must be stenciled with a brief statement that prohibits the discharge of improper materials to the storm drain conveyance system. All stencils must be approved by the city.

(14) Commercial developments that will be 100,000 square feet or larger must design the loading and unloading dock areas, any repair and maintenance bays, and/or any vehicle/equipment wash areas in a manner that reduces the potential for pollutants to come into contact with storm water runoff and eliminates prohibited non-storm water discharges. Site layout is subject to approval by the city.

(15) All restaurants must be designed to include equipment and accessory wash areas that have a self-contained grease trap that is connected to the sanitary sewer. If wash areas are located outdoors, it must be covered, paved, have secondary containment and be connected to the sanitary sewer. All sanitary sewer connections must be approved by the city.

(16) All retail gas outlets, automotive repair shops, repair/maintenance bays and vehicle wash areas must be properly designed to prevent oil and grease, solvents, car battery acid, coolant, gasoline, soap, detergent, waste and any other pollutants from discharging into the storm drain conveyance system. Site design must be approved by the city.

(17) Parking lots that will have more than 25 or more parking spaces must be designed in a manner that reduces impervious surface, minimizes the potential for polluted discharges and/non-storm water discharge, and must incorporate both treatment and runoff reduction measures to address pollutants of concern. Site design must be approved by the city.

(18) The applicant must prepare an erosion and sediment control plan for all construction activities related to implementing any on-site storm water management practices.

(19) All applicants must submit a maintenance plan with the storm water management plan which must identify long-term maintenance and operation strategy that will ensure the continued effectiveness of any specific storm water treatment or source control measure. The maintenance plan is subject to approval by the city.

(20) All storm water measures are subject to final inspection prior to issuance of certificate of occupancy.

(21) Upon the completion of construction, all storm water treatment facilities must be certified by a professional engineer.

(22) The city may require more stringent storm water management measures than those defined in this chapter.

(23) The city may develop a runoff reduction credit system that may reduce the amount of storm water treatment required.

(Ord. No. 826B, § 1(8.60.40), 10-23-2007)