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<br />B. Overlap. The aerial negatives and photographs for the entire area to be <br />mapped shall have the following overlap: <br /> <br />I. End lap Shall be 60% :!: 10%. <br /> <br />2. Side lap between adjacent flights shall be 30% :!: 10% <br /> <br />C. Photoi:raphic Quality. Negatives and prints shall be clear and sharp in <br />detail, of normal density, and of fine-grained quality. They shall be free <br />from streaks, oil stains, static marks, clouds, cloud shadows, smoke, haze, <br />snow, excessive shadows, and other deficiencies which would interfere <br />with their intended use. Reducing or intensifYing of negatives shall not be <br />permitted. <br /> <br />D. Ground Control. The contractor shall provide by instrument-survey <br />methods the horizontal and vertical ground control necessary for the <br />required mapping accuracy. The vertical ground control and contour <br />designation shall be used on United States Coast and Geodetic Survey <br />(USC& GS) or United States Geological Survey (USGS) Mean Sea Level <br />Datum (MSL) adjusted to the North American Vertical Datum of 1988 or <br />any more recent adjustment. The horizontal ground control shall be based <br />on a minimum oftwo USC&GS triangulation stations, or the equivalent, <br />and tied to the Lambert Conformal Conic Projection for establishment of <br />the Colorado State Plan Coordinate System, appropriate zone, with or <br />without Local Datum Adjustment within the project area. (See <br />Attachment A) <br /> <br />A minimum of third order, class I, control accuracy as defined by the <br />National Geodetic Survey (NGS) "Classification, Standards of Accuracy <br />and General Control, Surveys" shall be used when running the field <br />control by instrumental surveys. The ground control surveys shall be <br />supervised by a Land Surveyor licensed in the State of Colorado. <br /> <br />E. Plotter. A modern stereo plotter capable of being operated within a C- <br />factor range of C-1200 to C 1200 will be acceptable for compilation of the <br />topographic maps and cross sections. The contractor shall state the type of <br />equipment to be used and its operating C-factor for work to be performed. <br /> <br />F. Compilation. Using a stereo plotter, as listed in Attachment B, the <br />contractor shall compile maps as specified by the CWCB. The mapping <br />shall show all physical features within the area specified by the contract, <br />including buildings, fences, trees, road, streets, power lines, irrigation <br />ditches, reservoirs, and all other features that are discernible on the aerial <br />