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3 <br /> ORANGE COUNTY PLANNING DEPARTMENT <br /> MEMORANDUM <br /> To: PAUL THAMES <br /> County Engineer <br /> From: DAVE STANCIL, AICP <br /> Comprehensive Planner <br /> Date: JUNE 24, 1991 <br /> Subject: STATUS OF GROUNDWATER RESEARCH/HYDROGEOLOGIC MAP <br /> The purpose of this memo is to update our progress since the April <br /> 26 Groundwater Conference and our subsequent meeting. <br /> As you know, in accordance with the adopted Commissioners ' goal, <br /> Comprehensive Planning is pursuing a) researching all relevant <br /> groundwater data and studies, b) assessing the completeness of <br /> these studies, and c) developing a hydrogeologic map of Orange <br /> County as a resource for future groundwater work. <br /> This work is being done by intern Meg Scully, a recent UNC planning <br /> graduate (specializing in Land Use and Environmental Issues) , and <br /> myself. We have been fortunate, thanks to Meg's diligence, to <br /> uncover six additional sources on groundwater in this region beyond <br /> the three which I found in my Brief Overview, paper of October <br /> 1990 (attached) . <br /> We are still in the process of assessing this data. One difficulty <br /> has been converting some of the quantitative work from different <br /> studies into a common denominator. We plan to continue looking at <br /> the available resources over the next few months before attempting <br /> to draw any conclusions . <br /> However, a few things can be reported at this time. First, there <br /> are three studies which appear to stand out as potentially <br /> significant resources for our work. These can be found on the <br /> attached source sheet, and are 1) G.L Bain's 1966 work in the <br /> Durham area, 2) Charles C. Daniel ' s 1987 report (and 1990 <br /> followup) , and 3) Floyd and Peace' s 1974 study of the Upper Cape <br /> Fear basin. <br /> These studies are significant because each contains a form of a <br /> hydrogeologic map of the county or region. Meg has worked with <br /> these different sources to create a panel of maps from the three <br /> sources. This has involved grouping similar hydrogeologic units <br /> into common categories to make all three maps on the panel of a <br /> common type. <br /> As you can see from the panel, there appears to be some discrepancy <br /> between the 1966 Bain report and the latter two studies which were <br />