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2003-044
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2003-044
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Last modified
9/27/2016 2:00:30 PM
Creation date
9/30/2015 6:22:11 PM
Metadata
Fields
Template:
Official Documents
Official Document Type
Amendment
Approved Date
02/18/2003
Control Number
2003-044
Agenda Item Number
11.G.2.
Entity Name
Dial Cordy and Associates, Inc.
Subject
Beach Preservation Sectors 1 & 2 Amendment No. 4
Archived Roll/Disk#
3160
Supplemental fields
SmeadsoftID
3166
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3 . 3 Nearshore Turbidity Monitoring <br /> Turbidity monitoring will be conducted in accordance with Specific Condition 13 of DEP <br /> permit No . 0166929-001 -JC for this project. Turbidity at background and compliance <br /> station's at the borrow and beach nourishment sites will be measured by a portable <br /> nephelometer that meets Environmental Protection Agency standards . Turbidity will be <br /> measured from a boat using DGPS to accurately determine the position of sample points <br /> relative to the borrow area and beach nourishment sites. Samples will be collected every <br /> six hours during dredging, with all samples collected at mid-depth, with the compliance <br /> stations collected inside the specified mixing zones within the densest portion of any <br /> visible turbidity plume. In the event that turbidity exceeds 29 Nephelometric Turbidity <br /> Units (NTUs) above background levels in either the beach or borrow area compliance <br /> sites, construction activities will immediately cease until corrective measures have been <br /> taken, and the turbidity has returned to acceptance levels . <br /> Turbidity monitoring reports and maps shall be submitted to the Bureau of Beaches and <br /> Wetland Resources weekly during construction. Also reported are permit number, date <br /> and time of calibration, sample collection and sample analysis; water depth; sample <br /> depth; DGPS position; weather conditions ; tidal stage; current direction; and wind <br /> direction and velocity. Sampling locations, current direction, plume configuration and <br /> the location of the dredge and discharge point(s) are to be documented on a map that will <br /> accompany the Turbidity Monitoring Report. <br /> The turbidity monitoring program above will be tasked to the contractor via the contract <br /> documents for the project, and will be supervised by County Staff and the County' s <br /> engineering consultant. <br /> 3 .4 Other Nearshore Monitoring <br /> Other nearshore monitoring activities shall include video monitoring along the pipeline <br /> corridor and monitoring to determine the as-built extent of the Toe Of Fill (TOF) . <br /> 3 .4. 1 Dredge Pipeline Corridor Monitoring <br /> Limited monitoring will be conducted along the proposed dredge pipeline corridors to <br /> assess the extent of any impacts to hardbottom communities attributable to the presence <br /> of the pipelines (see Figure 5 for the proposed location) . Monitoring will consist of three <br /> video transect swims along the entire extent of the proposed pipeline corridors, with <br /> Positioning information integrated onto the videotape. The first video transect will be <br /> conducted prior to the establishment of the pipeline to document existing conditions . The <br /> second video transect will be conducted along the corridors with the pipeline in place to <br /> document and delineate any areas of hardbottom being impacted, and the final video <br /> transect will be conducted following the project to assess any impacts . Results of the <br /> pipeline corridor monitoring will be included in the first annual Biological Monitoring <br /> Report . <br /> 18 <br />
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