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CONTRACT PAGE Z ry 628 entire planning area showing all streets, street names on the street, surface water impoundments, railroads, streams, quarries, bridges, drainage ways, highways and highway names. d. Provide a total of one (I) index for the aerial photos and topographic maps for the entire planning area. e. Provide control data and diagrams describing placement of survey monuments 5. Conditions. A. All aerial photographs and topographic maps shall be on 24" x 36" sheets and cover an area of 40001 x 60001. B. Topographic reaps shall: (1) UisPIiy sheet number and north arrow. - (2) DisPIay graphic scales i.n feet and varas. (3) Co mPly with the National Alappirrg Standards of Accuracy both in plan and elevation. (4) Be CO-0rdinated on and display the Texas State Co- ordinate Systerrr -Horth Central Zone. F --- (5) Be horizontally controlled by extending the existing U. S. Coast and Geodetic Survey monuments by Geodimeter and eme Theodolite measurnts with further densifcation by - Aero Triangulation with an A -5 Autograph. Vertical 1 control shall be extended from existing U.S.C. and G.S..` Bench Marks by spirit leveling.. t (6) Use the format like the example attached hereto as Exhibit B and made a part hereof. ' a" C.. The error "�in relation between ma P projections and the plotted ,. position of any horizontal control point shall not exceed 0.01 j inch of their true positions at the map scale. Ninety percent (90%) of all well- defined planimetric features mapped. shatl be -- located within 0.025 inches of their true geographic position at the. map scale; no features shall be- displaced more than 0.05 1 inches. D. ninety percent (90 %) of all contours and elevation of points interpolated from contours shall be accurate within one -half (2)