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0030 <br /> Further Research Needs <br /> In addition to these recommendations, the Committee suggests that the County <br /> consider additional research in the following areas: <br /> 1. The areas of the County that contain the highest radon findings are <br /> associated with geologic conditions that extend into Chatham County. <br /> Additional research in conjunction with Chatham to explore these radon levels <br /> may be warranted. <br /> 2. For those areas of Orange County with higher water-borne radon, the <br /> potential exists for the gas to collect in houses, basements and other poorly <br /> ventilated areas. A program for testing of air and water radon levels should <br /> be encouraged in these areas. <br /> End Notes <br /> '-. Additional information on the effects of land use change, the use of on-site <br /> wastewater systems (septic systems), swales, and retention ponds on <br /> groundwater recharge is contained in a similar report for Guilford County written <br /> in 1997 <br /> 2- Please see table from 1996 entitled "Calculation of Recharge Area Required for <br /> Single-Family Residential Dwellings...", included in Appendix E. <br /> 23 <br />