(A) Erosion and sediment control measures. All control measures required under this chapter shall conform to the design criteria, standards, and specifications provided in the applicable standards referenced in § 151.13 now in effect or as hereafter amended. All control measures installed shall be sufficient to prevent sediment from leaving the permit site during a five-year frequency storm event. Measures shall be taken to prevent sediment from leaving the site. When sediment does leave the site, the owner, developer, or contractor shall remove the sediment within four hours, or by no later than the end of the work day. For example, installing a rock construction drive or cleaning tires could be used to minimize tracking of sediment onto public roads.
(B) Permanent stormwater control measures. All stormwater controls shall be designed so that the peak discharge rate from the permitted area resulting from the two-year and 25-year frequency storm events for the post-project condition do not exceed the corresponding storm event peak discharges for the pre-project condition. Evaluation of submitted plans shall be based on the Stormwater Design Analyses Standards in § 151.12.
(C) Regional stormwater control systems. To allow for the beneficial development and maintenance of regional stormwater management systems, where they are available and they are appropriate, an applicant may submit a design dependent on such a system. The applicant may submit documentation of the approval for the use of the regional stormwater management facility from the governmental agency having jurisdiction over it. The applicant shall submit evidence showing that there will be no adverse flooding impact to any receiving stream between the point of discharge and the regional stormwater facility. If the applicant is approved to use the regional stormwater management system, the applicant may request exemption from the requirements in this section for permanent on-site stormwater controls from the Erosion Control Administrator. Such exemption shall not apply to any temporary stormwater control measures required by this chapter.
(Prior Code, 8 TCC 3-3)