The MSD shall review all EPSC plans for compliance with the following general standards and review criteria.
(A) Overall design goal.
(1) A design removal efficiency goal of 80% for total suspended solids from land disturbing activities shall be applied to the design, review, and approval of EPSC plans. The following structural and non-structural standards are to be utilized to achieve this goal.
(a) Compliance with the MSD design manual, standard specifications, and standard drawings. Except where innovative or alternative management practices are approved pursuant to division (B) below, all EPSC measures shall be designed and installed in accordance with the specifications contained in the MSD Design Manual, Standard Specifications, and Standard Drawings, as it may be revised from time to time, which is hereby incorporated by reference into this chapter.
(b) Non-structural site management practices. Non-structural site management practices to prevent erosion and minimize sediment discharge shall be considered in the MSD’s evaluation of this division (A). Such practices may include the following standards:
1. Minimize site disturbance to preserve and maintain existing vegetative cover;
2. Limit the number of temporary access points to the site for land disturbing activities;
3. Phase and sequence construction activities; and/or
4. Locate temporary and permanent soil disposal areas, haul roads, and construction staging areas to minimize erosion, sediment transport, and disturbance to existing vegetation.
(2) Where attainment of this design removal efficiency goal through the use of structural and non-structural measures is not practicable, the permittee shall submit written justification to the MSD for review and approval.
(B) Alternative management practices. To encourage the development and testing of alternative EPSC measures, alternative management practices that are not included in the MSD Design Manual, Standard Specifications, and Standard Drawings may be allowed upon review and approval of the MSD.
(1) A permittee seeking to use an alternative management practice shall concurrently submit substantial evidence that the proposed measure will perform at least equivalent to a currently approved control contained in the MSD Design Manual, Standard Specifications, and Standard Drawings. Evidence may include, but is not limited to, peer-review by a panel of registered professional engineers and research results as reported in professional journals or other literature.
(2) If the MSD finds the control or practice has failed or is inadequate to contain sediment on- site, the permittee shall remove and replace it with a control approved by the MSD and found in the MSD Design Manual, Standard Specifications, and Standard Drawings.
(Ord. 26, passed 9-25-2001)