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All benchmarks and control which we establish are transferred from published geodetic data. We are conscious of the eleven- inch difference between the NGVD 29 and NAVD 88 datum and that the new FEMA flood maps being released will be on NAVD 88. For example, because the majority of Hilton Head Island currently lies within a flood plain, verification of the datum being used is absolutely critical. All survey crews at Atlas Surveying, Inc. are trained in the proper procedures for establishing horizontal and vertical control.

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