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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 /> 13 . 1 . 1 . 2 .2 Sebastian Inlet Sand TiapBorrow Site. The CONTRACTOR <br /> shall be responsible for the third partv to conduct turbidity <br /> monitoring at the borrow site every six (6 ) hours during <br /> dredging operation with the First sample taken within 10 <br /> minutes following commencement of each dred m evc1e. <br /> The CO'NTRACTOR' S third part shall collect additional <br /> samples at the request of the ENGINEER or the COUNTY, <br /> The CONTRAC'TOR ' S third party shall collect Back round <br /> and Compliance samples for the offshore bonow site The <br /> Background turbidity sample shall be collected at a minimum <br /> distance of 300 meters (984 feet) un-current from the dredge <br /> and clearlyoutside ofanvpimect-induced turbid plume The <br /> borrow site Background sample shall bQ collected at mid- <br /> deptli . <br /> The Compliance Site Tvpe I turbidity samples -hall be <br /> collected at a maximum distance of 150 meters ("492 feet) <br /> down-current from the dredge in the densest portion of any <br /> visible turbidity plume and the sample- shall be collected at <br /> the surface and mid-depth If the difference between the <br /> Compliance Site Type 1 and Background samnles is «neater <br /> than 2 NTUs, construction activities shall ceaseimmediateh, <br /> and not resume until measur€s have been taken. and the <br /> difference between the Complmnec Site Type I and <br /> Background samples is 0 NTC or less- If the difference <br /> between the Compliance Site Type 1 and Backgmunt' <br /> samples is greater than 0 NTUs and less than or equal to <br /> NTi1s , the CONTRACTOR ' S third panty shall repeat the <br /> sampling (both the Background and Coin pliance Site Tx pe 1) <br /> 30 minutes later If the difference between the Can Bance <br /> Site Type I and Backm-ound samples remains to be greater <br /> than 0 NTUs and less than or equal to a NTUs. the <br /> CONTRAC'TOR ' S thirdpartN_,hall repeat the carrujing evcry <br /> 30 minutes. If the difference between the Compliance Site <br /> Tvpe I and Background samples becomes 0 or less the next <br /> sampling effort shall occur 6 hours later if atter a total of <br /> four consecutive samples- the difference between the <br /> Compliance Site Tvpe I and Background samples remains to <br /> be greater than 0 NTUs and less than or equal to I NTIIs <br /> construction activities shall cease immediately and not <br /> resume until measures have been taken and the difference <br /> TECHNICAL AND ENVIRONMENTAL SPECIFICATIONS Rev October 5, 200; TS-9 <br />