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Geraghty & Miller, Inc. -4- 7 January 1980 may then decide how best to proceed. At the county's option, this well could be designed solely as an observation well or as a second production well. During the construction and testing of wells, a Geraghty & Miller, Inc., hydrogeologist will act as resident inspector at the site. In addition to determining that the wells are constructed according to specifications, the hydrogeologist will describe and analyze formation samples collected during drilling and perform field analyses on water samples collected as drilling progresses in the Floridan Aquifer. Borehole geophysical logging will be performed during the drilling operation. Previous investigators have speculated on the existence of a secondary artesian aquifer in eastern Indian River County. This zone, occurring below the shallow aquifer and above the Floridan Aquifer in western portions of the county and outside the county, has not been reported to the east. Its existence could provide an important future water source in the county. Therefore, before casing is installed in wells, electric and gamma -ray logging will be conducted in the region above the Floridan Aquifer to detect the presence or absence of this aquifer. Geraghty & Miller, Inc., has equipment to prepare these logs and will provide the services. In the Floridan Aquifer, more extensive logging is necessary and the drilling contractor will provide geophysical services. Among the logs that will be required in the Floridan Aquifer are electric, gamma, temperature, caliper, flow meter, and fluid conductivity logs. The hydrogeologist.will coordinate between Geraghty & Miller, the Joint Venture, and the drilling contractor so that logging and any other special testing pro- cedures are completed on schedule. Upon the completion of drilling, Geraghty & Miller, Inc., will assist the contractor in the performance of pumping test. At least one controlled pumping test of approximately 72 hours, duration will be conducted on the production well. This test will be designed so that the hydrologic characteristics of the Floridan Aquifer will be established. Factors to be evaluated will be transmissivity, storage, vertical leakance, and the potential for upconing. Knowledge of these characteristics will serve as the basis for evaluating the impacts of the proposed diversion and determining optimum well yields. JAN 91980 BOOK 1-4 Pact 523