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CENTURY <br />W///W <br />E N G I N E E R I N G <br />TASK 2 - DESIGN SURVEY & PROJECT BASE MAP SET UP (KPG) <br />It is assumed a partial project survey and base map were previously prepared as part of <br />the separate Airfield Environmental Assessment project. Previous topographic survey <br />data collected included Runway 7-25 pavement grades at a 25 foot grid and included <br />centerline and edge grades. Previous topographic survey also included off -pavement <br />grades within an area 500' wide centered on runway centerline for the full runway <br />length plus 300' beyond each runway end. Drainage features, signs, edge lights, <br />reflectors and utilities were also included as part of this effort. As the Runway 25 end of <br />pavement has since been modified, supplemental grade data is necessary. <br />To support runway profile and RSA grading design, and to ensure proposed runway end <br />points are accurate; and to ensure the runway has a clear approach; additional survey <br />data to be collected and mapped will include: <br />• Tie to established local control points. <br />• As -built survey new Runway 25 pavement end established at completion of <br />pavement break project. <br />• Additional topographic survey off the new Runway 25 end of pavement. <br />• Proposed runway threshold/end clear approach field verification <br />Task 2 Work Items: <br />1. Supplemental Topographical Survey Services <br />This task includes the following: <br />+ Validate horizontal and vertical control that was completed as part of the Airfield <br />Environmental Assessment project. Re-establish horizontal and vertical control as <br />necessary. Horizontal and vertical control shall be tied into horizontal (NAD <br />83(2011)) and vertical control (NAVD 88) points used for the previous topographic <br />survey effort. Validate one benchmark for elevation control and a minimum of two <br />additional points for horizontal control. Utilize Airport PACs and/or SACS if <br />available. <br />• Conduct topographic surveying for the Runway 25 end of pavement: <br />o Determine the location and elevation of the end of runway pavement at runway <br />centerline; <br />o Determine the location and elevation of the end of runway pavement at the <br />outermost edges of runway pavement; <br />o Determine the location and elevation of the end of runway pavement at 25 -foot <br />increments along the end of pavement. <br />4of11 <br />