Reso 2025-3788 - Laserfiche WebLink

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being cleaned and maintained, and as long as the decanting is done into the same system if infrastructure is located in the public right-of-way or at the same site or facility. 2.1 Dewatering operations associated with regular cleaning and maintenance of stormwater and utility infrastructure It is necessary to maintain the functionality of stormwater and utility infrastructure through the removal of water, debris, sediments, litter, and other obstructive matter collected within the drainage structures and conveyance features. These materials are mixed with stormwater and groundwater that enter underground facilities, pipes, and trenches. Typically, a dewatering operation is necessary to complete the task of cleaning stormwater and utility infrastructure. The liquids collected within underground structures are removed using allowed pumping devices. As per section 24-48.1(1)(e) of the Code, the dewatering operations described above require a Class V permit. 2.2 Dewatering operations associated with temporary flood protection As dictated by section 24-48.1(1)(e) of the Code, temporary dewatering operations that are required to eliminate ponding and/or flooding in the area with no or insufficient, inadequate stormwater infrastructure during or after rainfall or high -tide events, require a Class V permit. 3.0 Best Management Practices. 3.1 Dewatering operations associated with regular cleaning and maintenance of the stormwater and utility infrastructure ■ Class V permit must be obtained before the commencement of dewatering operations, in accordance with section 2.0 of this guidance. ■ Only Vacuum/Vactor trucks used for stormwater maintenance activities are allowed to serve stormwater and utility infrastructure if the effluent discharge is to be decanted into other stormwater infrastructure. ■ The dewatering effluent cannot be discharged into a surface water or stormwater infrastructure with an outfall(s) or overflow(s) structure, without approved pre-treatment, unless otherwise approved by the Director or the Director's designee. ■ Dewatering effluent shall only be discharged at locations approved by the Class V permit. ■ The liquid content of stormwater and utility infrastructure (dewatering effluent) removed by the approved equipment must be pretreated before discharge into the location approved by the Class V permit. The proposed pretreatment method must be submitted to the Division of Environmental Resources Management (DERM) for review and approval. The proposed treatment must be designed to remove sediments, silt, and oils, such as heavy-duty drain filters or similar technology. An existing pretreatment system that complies with the Code of Miami - Dade County and state requirements may be accepted as a substitute for the required pretreatment, subject to approval by the Director or the Director's designee. ■ Before the commencement of the dewatering operation, the stormwater or utility infrastructure and their content must be visually inspected for signs of contamination, such as unusual color, staining, corrosion, unusual odors, fumes, oily sheen, etc. If signs of contamination are identified, the dewatering effluent shall be transported by a permitted liquid waste transporter Page 2 of 4