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30 <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 1=lndings 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 />1- 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 captained 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 />z~ <br />