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(2) A preliminary engineering report, containing the items required by <br /> the rules of the TCEQ and, in particular, a description of the area, <br /> land use plan, existing and projected populations, tentative cost <br /> estimates of the proposed improvements, projected tax rate and <br /> water and sewer rates,investigation and evaluation of the availability <br /> of comparable service from other systems and bond issue <br /> requirements. <br /> (3) Environmental maps of the district at a scale of one inch to 500 feet. <br /> These shall include: <br /> a. Contour intervals of ten feet or less. <br /> b. Delineation of all areas sloping one percent or less; one <br /> percent to 15 percent; 16 percent to 25 percent; 26 percent <br /> or more. <br /> c. All aquifer recharge structures to include the following: <br /> caves, sinkholes, cracks, fractures or fissures at the surface <br /> and watercourses or drainageways which have recharge <br /> structures within them. <br /> d. One-hundred-year floodplain and floodway. <br /> e. Any trees 50 feet or taller and all trees with a caliper of 30 <br /> inches or greater. <br /> f. The habitat of endangered or threatened species of fauna or <br /> flora. <br /> g. Soils with high shrink/swell ratios, soils that are easily <br /> eroded, and soils that are classified as prime agricultural by <br /> the state department of agriculture or the United States <br /> Department of Agriculture. <br /> h. Wetlands. <br /> i. Archaeological sites. <br /> j. Manmade structures over 75 years old. <br /> (4) Land use map at a scale of one inch to 500 feet. This shall include: <br /> a. The location of all existing and proposed roads with a right- <br /> of-way of 60 feet or more. <br />