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<br /> 92 <br />August 27,1984 <br />Dr. Glen Longley, Ph.D <br />Director <br />Ð::lwards Aquifer Research and Data Center <br />Southwest Texas State University <br />San Marcos, Texas 78666 <br />Dear Dr. Longley: <br />This letter establishes the terms of an agreement between the Ð::lwards <br />Aquifer Research and Data Center and the City of San Marcos for the <br />production of a series of overlaying maps that can be used for planning <br />puIp:)ses to minimize the impact of developm:mt on the Ð::lwards Aquifer. <br />Accorrpanying the maps will be a report on local groundwater flow as <br />interpreted from dye traces, well water chemistry, and changes in water <br />chemistry of springs and area wells. Both the maps and report are <br />those outlined in a proposal to make geologic and hydrologic maps of <br />the San Marcos area by Dr. Albert Ogden, said proposal having been <br />amended by City as follows: <br /> Page 2, METHODS, #1, first line: the ratio "1:20,000" <br /> changed to "1:24,000" and the word "scale" inserted after <br /> such ratio. <br />Such proposal, as amended, is attached hereto and incorporated herein <br />for all purposes. <br />Specific maps and reports to be produced under this agreement are: <br />1. Photo-lineament/Fracture Map <br /> Black and white, 1:24,000 scale, aerial photographs of the <br /> study area will be used for defining large karst features <br /> (such as sinkholes, caves, and open fractures), and various <br /> types of topographic and color tone aligruœnts that could <br /> represent fractures that act as recharge points and avenues of <br /> groundwater moverœnt. <br />2. well Location Map <br /> A door-to-door survey and well drillers' logs will be used to <br /> gather as many well loca tions as possible wi thin the tirœ- <br /> limitation of the study period. <br />