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dredge and fill are amended as set forth in Change Order Number 1 attached hereto as "Composite Exhibit B" . The foregoing Bid Form is further amended to add new Item 7, dredge standby time. The Bid Form applicable to Sector 7 is amended to add items 6 and 7, hopper dredge standby time, as set forth in Change Order Number 2 attached hereto as "Composite Exhibit B" . 4. From and after the effective date of this First Amendment, the County agrees, solely with respect to the Inlet Sand Source portion of Sectors 1 and 2 portion of the Project, to pay a " Standby Rate" of $2, 431 . 65 per hour, with a maximum quantity of 100 hours for a total of $243, 165. 00. The Standby Rate will apply and be payable for the following delays and/or non-productive times exceeding 7. 2 hours per day (30% ) on average for the duration of the Inlet Sand Source dredging work: (a) All shutdowns and/or non-productive time due to or ordered by the Owner, Engineer, or permitting agencies in relation to turbidity that is in the range of 0-29 NTUs above background . Per the permit, the Contractor will continue testing the turbidity until there are 0 NTUs above background. At such time as there are 0 NTUs above background, the Contractor will resume dredging at the applicable unit rate; and ( b) All shutdowns and/or non-productive time due to or ordered by the Owner, Engineer, or permitting agencies in relation to permit restrictions including, but not limited to, small tooth saw fish, shore birds, and/or sea turtles including the creation of buffer zones around any location where shore birds or turtles have been engaged in nesting behavior or territory defense, to include shut downs due to any other site-specific buffers implemented by Florida Fish and Wildlife Commission as needed. Standby time in excess of the 100 hours allowed herein will be addressed by subsequent Change Order, if needed, at the agreed rate of $2,431 . 65 per hour. 5. From and after the effective date of this First Amendment, the County agrees, solely with respect to the Inlet Sand Source portion of Sectors 1 and 2 portion of the Project, to the new unit price of $26. 02 per cubic yard, with an estimated contract volume of 100, 000 cubic yards for a total estimate of $2, 602, 000. 00 for dredging and fill work pursuant to the Contract Documents. The County agrees, solely with respect to the Inlet Sand Source portion of Sectors 1 and 2 portion of the Project, to the new Mobilization/Demobilization lump sum of $751 , 820, as set forth in Composite exhibit " B". 6. From and after the effective date of this First Amendment, the County agrees, solely with respect to the Sector 7 portion of the Project, to pay a " Hopper Dredge Standby Rate" of either $69, 524 per day pro rata for one dredge on site for a maximum time of five (5) days; or $87, 751 per day pro rata for two dredges on site, for a maximum time of five (5) days, all as set forth on Change Order Number 2 in Composite Exhibit " B ." The County and Contractor acknowledge and agree that the aggregate hopper dredge standby time is ten ( 10) days. The Standby Rate is payable when there are documented delays due to a) shorebird nesting and monitoring; b) small tooth saw fish; c) sea turtle nesting; and, d) any ordered suspension of work. Standby time in excess of the 10 days allowed herein will be addressed by subsequent 2