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control gates are opened to release flood waters stored in approximately 150 miles of <br /> canal and ditch network in the 21 , 705 acre basin . Gate openings occur approximately <br /> 20 times per year and remain open 2 ,000 to 3 , 000 hours per year. Discharges following <br /> a gate opening can reach 400 cubic feet per second . Due to the characteristics of this <br /> unique discharge situation , the County proposes to collect frequent grab samples from <br /> the influent to the vortex unit and from the effluent. Flow will be continuously monitored <br /> so that a mass loading will be established from the concentration data following <br /> laboratory analysis of the samples (see parameter list above) . Since the focus is on <br /> particulate matter and its associated pollutants , we do not recommend the conventional <br /> automated sampler with the small intake tubing . The typical intake tubing associated <br /> with a sampler cannot pull a representative sample that contains the particulate load . <br /> The County proposes to conduct a characterization of both the influent and effluent <br /> channels to determine the best sampling technique . We will work with FDEP to develop <br /> the most appropriate sampling protocol to establish effectiveness monitoring . <br /> REMAINDER OF PAGE INTENTIONALLY LEFT BLANK <br /> DEP Agreement No. GO 182, Attachment A- 1 , Page 12 of 12 <br />