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11 <br /> model which will show and account for the effects of the relationships among and between <br /> population densities,land use(impervious surface,ground cover,infiltration capacity)and <br /> hydrogeologic conditions(soil types,topography,hydrogeologic units). Consideration shall be <br /> given to the potential effects of modifications to the plumbing section of the North Carolina <br /> Building Code. <br /> Estimates of recharge rates for each aquifer will be compared with rates of -water use <br /> estimated from representative wells or average ruai consumption rates and with estimated losses <br /> associated with various waste-water treatment practices to determine whether each aquifer's <br /> water table is--m theocratically should be—rising,falling or remaining constant. Information on <br /> waste-water treatment systems,including onsite septic and offsite treatment plants,will be <br /> compiled from local utilities and census data The project staff will set up its data reporting and <br /> analysis format such that,on completion of the investigation,County staff can continue the <br /> process of making orisons of water level records with current monitoring results to further <br /> understand water quantity trends. The delineation of ground-water usWosses is to be <br /> calculated on the finest resolution possible based on hydrogeologic boundaries. <br /> The resulting data on ground-water availability and current use will be displayed on a map <br /> and entered into a database compatible with the County's ESRI ARC-INFO Geographic <br /> Infasmtion System(00). The resulting database will facilitate the future drafting of policy by <br /> enabling the combination of these data with other information relevant to land use such as <br /> psolected population,zoning distracts,and nature!areas. <br /> 4. Delineate wellhead capture areas for several high-yield wells: <br /> The importance of wellhead capMM areas lies in their direct link to ground-water <br /> consumption and implications for health. Knowing the approximate location and extent of these <br /> areas is necessary to make land-use decisions that protect them from contamination. <br /> To the extent possible,all public supply wells identified from State and County records will <br /> be included in the well inventory. Wellhead capture areas will be estimated for several(3 or 4) <br /> high-yield wells(dwsc yielding geaw than 25 gallons per mi )using techniques <br /> rzconuMended by the N.C.Division of Water Quality,Ground-Water Section. These win be <br /> available as examples for training sessions on capture area delineation to be included in <br /> information transfer meetings. <br /> Task II—Water Quality <br /> This please will involve compilation of available information on the quality of the the <br /> County's ground water with respect to natural and man-made constituents,known ground-watear <br /> contamination sites,and locations and withdrawal rates of pound-water based public supplies. <br /> In addition,new infomation will be obtained by sampling representative wells for selected <br /> chemical constituents such as radon,nutrients,trace metals silica.and hardness. Tests for <br /> possible contaminants such as bacteria,components and derivatives of motor and heating fux.ls, <br /> and herbicide/pesticide residues may be indicated for some wells. <br /> 7 <br />