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INDIAN RIVER COUNTY MITIGATION REEF PROJECT Is TECHNICAL AND ENVIRONMENTAL SPECIFICATIONS CONTRACTOR submits a written request within 30 days of the delay(s ) and the delay(s) is substantiated by the official NOAA weather reports as indicated above or by COUNTY lifeguard station weather logs or by observations recorded by staff. It shall be the responsibility of the CONTRACTOR to supply supporting weather data (official NOAA weather report) with the request for time extensions due to weather delays . 31 POST-CONSTRUCTION BATHYMETRIC SURVEY Following reef construction , and within 30 days following final completion inspection and approval by the COUNTY, the CONTRACTOR shall perform a bathymetric survey of the reef construction area . Bathymetric surveys shall extend in the cross shore direction from DEP reference monument R-91 south to DEP reference monument R-94 and shall be performed at 250-foot spacing . Cross-shore surveys shall commence (survey origin) approximately 600 feet from the survey baseline (at approximately the — 10 ft NGVD contour) and extend offshore from the survey origin approximately 600 ft (to approximately the —20 ft NGVD contour) . The bathymetric survey shall also include alongshore transect(s ) that will traverse roughly along the centerline (s ) of the HRHC and LRLC mitigative reef units . The alongshore transects shall commence at DEP Reference Monument R-91 and extend to R-94 , shall commence at approximately the —10 feet NGVD contour and shall be spaced at 50-foot intervals until the —20 foot NGVD contour is captured . Alongshore transects shall be taken such that two of the tracklines are located over the length of the constructed Mitigation Reef Area . All survey drawings shall be referenced to the project datum as specified in Section 13 . 1 and shall be at a scale acceptable to the COUNTY. Final plan view drawings shall be submitted both with and without contours . All data ( both discrete data points and contoured data ) shall be tide-corrected as specified in Section 31 . 2 . 31 . 1 Accuracy. Offshore survey elevations shall be measured to the nearest 0 . 1 foot referenced to NGVD . To ensure this accuracy is maintained , if a fathometer is used , the fathometer shall be calibrated at the start of each survey day, after every third profile line , at the end of each paper roll , and at the end of each day. Survey vessel settlement and squat must be determined at survey speeds and applied to correct the water depth measurements . Equipment and procedures must be in accordance with the methods specified in USACE Hydrographic Surveying EM 1110-2- 1003 dated October 1994 ( Updated January 1 , 2002 ) . A tolerance of no more than 30 feet either side of the azimuth on offshore segments of the profile line shall be allowed . Data points obtained offshore by bathymetric survey methods ( i . e . , fathometer) shall be taken at a spacing of not more than 20 feet . 31 .2 Tides . Average still water elevation (tides ) shall be measured for offshore beach profile surveys . Tides shall be measured by tide staff readings using a stilling well while conducting the offshore bathymetric surveys . The stilling well shall be located on each profile line during the offshore survey. 31 . 3 Deliverables . Deliverables to the COUNTY shall include processed survey data of date , range , station , and elevation from each of the FDEP and COUNTY and TS-25