42-239.1 Stormwater BMP Manual

  1. Stormwater BMP Manual. The Water Quality Administrator shall use the policy, criteria, and information, including technical specifications and standards, in the Stormwater BMP Manual as the basis for decisions about Stormwater Management Permits and about the design, implementation and performance of structural stormwater BMPs and non-structural stormwater BMPs. The Stormwater BMP Manual includes a list of acceptable stormwater treatment practices, including specific design criteria for each stormwater practice. Stormwater treatment practices that are designed, constructed, and maintained in accordance with these design and sizing criteria will be presumed to meet the minimum water quality performance standards of the Phase II laws.
  2. Relationship of Stormwater BMP Manual to Other Laws and Regulations. If the specifications or guidelines of the Stormwater BMP Manual are more restrictive or apply a higher standard than other laws or regulations, that fact shall not prevent application of the specifications or guidelines in the Stormwater BMP Manual.
  3. Changes to Standards and Specifications. If the standards, specifications, guidelines, policies, criteria, or other information in the Stormwater BMP Manual are amended subsequent to the submittal of an application for approval pursuant to this Subpart B but prior to approval, the new information shall control and shall be utilized in reviewing the application and in implementing this Subpart B with regard to the application.