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13 . 1 . 1 . 1 Equipment. The CONTRACTOR shall <br /> use a portable nephelometer that meets Environmental <br /> Protection Agency standards to measure turbidity. The nephelometer <br /> shall have been factory calibrated within the last year. The <br /> CONTRACTOR shall use a boat of sufficient size to conduct sampling in <br /> the nearshore waters during the winter and outfitted to meet all safety <br /> requirements of the U . S. Coast Guard. The boat shall possess sufficient <br /> navigational instrumentation (DGPS) to accurately determine the position <br /> of sample points relative to the dredge and the discharge point and an <br /> operational VHF radio and cellular phone for communication with the <br /> dredge and COUNTY staff. <br /> 13 . 1 . 1 .2 Turbidity Monitoring. The CONTRACTOR shall be responsible for <br /> taking turbidity measurements during any construction activity <br /> as described in Section 31 and Appendix F of these Technical <br /> Specifications. The sampling locations must be consistent with the <br /> project permits, specifically with the Water Quality Monitoring Required <br /> Section of the Florida DEP permit. <br /> 13 . 1 . 121 Borrow Site. The CONTRACTOR shall <br /> conduct turbidity monitoring <br /> at the borrow site every six (6) hours during dredging <br /> operation with the first sample taken within 1 hour following <br /> commencement of each dredging cycle. ..__ <br /> s <br /> The CONTRACTOR : ; ; shall collect <br /> Background and Compliance samples for the c J borrow <br /> site. The Background turbidity sample shall be collected at a <br /> minimum distance of 500 meters ( 1 ,640 feet) up-current from <br /> the dredge and clearly outside of any project-induced turbid <br /> plume. The borrow site Background sample shall be <br /> collected at mid-depth. The Compliance turbidity sample <br /> shall be collected at a maximum distance of 150 meters (492 <br /> feet) down-current from the dredge, in the densest portion of <br /> any visible turbidity plume, and the samples shall be collected <br /> at the surface and mid-depth. <br /> TECHNICAL AND ENVIRONMENTAL SPECIFICATIONS - TS-8 <br />