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<br />, . <br />" <br /> <br />. <br /> <br />. <br /> <br />" <br /> <br />monitoring equipment may installed (if necessary), the water-budget model will be refined, the <br />ground-water modeling effort will begin, any additional field data collection will be performed <br />(including information required for a ground-water model), and data reports will be generated. The <br />overall schedule for the pilot study is 3 years. Many of the tasks will be completed in parallel to <br />minimize the overall study schedule, but shortening the schedule typically can increase the yearly <br />cost. <br /> <br />The tools developed for the pilot project can then be used for an expanded study in the <br />remainder of the mountainous areas of the County or in selected, high-growth areas. It would be <br />necessary to collect additional field and historical data for these parts of the County. The larger <br />County study could overlap the pilot study, with the data collection beginning while the pilot study <br />model was developed and calibrated. Depending on the level of study detail and funding, the larger <br />scale study could require 2 to 4 years of data collection and analysis. <br /> <br />A preliminary timeline of the study is provide in table 1. Details of the schedule are provided <br />below. <br /> <br />F .1. Description of pilot study tasks for FY1998 <br /> <br />The following tasks have been completed to date: <br /> <br />(1) Established the interface between the Jefferson Countv GIS department and USGS GIS svstem. <br />The existing Jefferson County GIS coverage of the area is being used to build a picture of the <br />ground-water system. Jefferson County and USGS have established a method to transfer <br />information to ensure the data is interpreted correctly by both parties. The GIS coverage is <br />important for developing water level maps, locating and delineating contamination plumes, and <br />developing ground-water models. <br /> <br />(2) Installation the surface-water and precipitation qaces. An accurate accounting of the input to and <br />output from the Turkey Creek basin is required to develop a water budget. The input will be <br />determined by measuring rain and snow falling into the basin. Existing precipitation gages will be <br />used, along with four weighihg bucket rain gages. Ten additional precipitation stations, operated <br />by volunteers, will be located in the basin. The output of the basin is a combination of surface- <br />water runoff, ground-water return flow, and ground water leaving the system through deep <br />fractures. A surface-water gage has been installed on Turkey Creek as it exits the mountain <br />bedrock to measure the surface-water runoff along with the ground-water Teturn flow. <br />Evapotranspiration, ground-water withdrawal, and septic system return can be estimated for the <br />water budget. Using the known parts of the water budget, the ground water leaving the system <br />through deep fractures can be calculated. <br /> <br />(2a) To provide a more accurate measurement of evapotranspiration in the basin, the County <br />and USGS are planning to install an evapotranspiration tower in the basin. A member of <br />the USGS National Research Program is currently working to install a set of weather <br />instruments mounted on a tower in the basin. <br /> <br />(3) Developed a plan for the field samplinq activities. Public outreach was used to locate <br />homeowners and businesses willing to cooperate with the data collection phase of the study. <br />Wells were located that can be measured for water levels and/or sampled for ground-water <br />quality. <br /> <br />(4) Collect field measurements of qround-water levels (usinq existinq wells) and water-qualitv <br />samples. Water-level measurements have begun for the basin and ground-water quality samples <br />will be collected from each sub-basin in the Turkey Creek basin. There are several sub-basins <br /> <br />5 <br />