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395 EXHIBIT A SCOPE OF WORK 1. INTRODUCTION The Texas Water Development Board (TWDB) shall perform, or cause to have performed, a hydrographic survey of Lake Crook, Texas. The purpose of this survey is to collect hydrographic data when the reservoir is at or above the normal /conservation pool elevation, and convert this information into area - elevation - volume table. 2. LOCATION OF SURVEY Lake Crook is located in Lamar County in east Texas. The dam and lake are on Pine Creek approximately two miles north of the City of Paris, Texas. The facility provides water supply for Paris, Texas. Water- rights owner and operator of Lake Crook is the City of Paris, Texas. The lake has a surface area of 1,226 acres. 3. SURVEY PLAN, SPECIFICATION, AND ANALYSES Surface acreages will be based on Digital Orthophoto Quadrangles, if available. Positioning on the lake surfaces will be established utilizing Differential Global Positioning System (DGPS) with an estimated resolution of three meters or better. Survey data will be collected from survey lines spaced at approximately 500 feet. These lines will be followed to the extent possible as permitted by obstructions. Positioning and sounding data will be collected and stored electronically at the rate of one measurement every second, or an average spacing of twenty (20) feet. The model of the lake bottoms will be mathematically interpolated between collected points by accepted engineering practices, and will be mathematical estimates of the actual bottoms. Analyses of the survey data will include the following deliverables: (1) elevation- area - volume tables, acceptable to the Texas Natural Resource Conservation Commission (formerly the Texas Water Commission), of the reservoirs with definition of 0.1 feet; (2) bottom contour maps with definition of 5 feet; and (3) a shaded relief plot of