2007-136 - Laserfiche WebLink

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• The survey area shall extend outside the entire permitted borrow site by a minimum of 500 feet. • Cross-sections of the borrow site shall be surveyed perpendicular to the long axis of the borrow site. • Cross-sections shall be surveyed at 250 foot intervals and shall extend a minimum of 500 feet beyond the boundaries of the borrow site. • All survey drawings shall be at a scale acceptable to the COUNTY. Final plan view drawings shall be submitted both with and without contours. • All drawings shall be submitted in an electronic format acceptable to the COUNTY. 34. PRE AND POST-CONSTRUCTION BEACH AND OFFSHORE SURVEYS The elevations indicated in the Plans are based on a survey conducted in August 2001 and may not represent accurate beach elevations at the time of construction. Therefore, the CONTRACTOR shall perform a beach profile survey prior to the initiation of construction. The surveys shall be conducted so that the COUNTY may adjust the fill volume as needed at the cross-sections and provide the CONTRACTOR with a template or pay volume change order if required. Pre-construction surveys shall be conducted by the CONTRACTOR no more than four (4) weeks prior to the commencement of dredging. These pre-construction surveys shall be provided to the COUNTY no less than two (2) weeks ( 14 calendar days) prior to the commencement of dredging so that the design templates may be adjusted by the COUNTY to reflect the pre-construction survey. Post-construction surveys shall be conducted no more than two (2) weeks following completion of dredging. 34. 1 Beach Surveys. Beach profiles shall be conducted by differential leveling techniques from the back beach or dune across the profile to approximately 40 feet seaward of the design fill section using laser distance measurement instrumentation or other method approved by the COUNTY. CONTRACTOR shall close all level loops and said closure shall be less than 0.04 feet. This survey work shall be documented in field books with copies supplied to the COUNTY. 34.2 Offshore Surveys. Offshore surveys shall be conducted by the CONTRACTOR using standard positioning and hydrographic surveying equipment and techniques . The CONTRACTOR shall utilize horizontal positioning equipment that has an accuracy of at least f3 feet. If range-range positioning system is used, shore stations must be set to ensure the accuracy of t3 feet. The location offshore control stations for the beach profiles must be approved by the COUNTY prior to the beach profile surveys. 34.3 Survey Points. A sufficient number of points shall be taken along each line to ensure adequate description of the profile. All topographic features, and major breaks in slope, including dunes, beach berms, foreshore, and bar and trough systems, shall be identified. On smoothly sloping sections a maximum elevation difference of approximately 1 foot between adjacent points shall be used to define this section of the profile. The design berm TECHNICAL AND ENVIRONMENTAL SPECIFICATIONS TS-33