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28 July 2025 <br />Ms. Laura Haywood <br />Entitlements Program Manager <br />Forestar – Carolinas East Division <br />VIA E-mail: LauraHaywood@forestar.com <br />RE: Rigsbee – Orange County, NC – Proposed Community Well Drawdown: Impacts to Adjacent <br />Single Use Wells: Preliminary <br />Ms. Haywood: <br />Pursuant to your request, Spangler Environmental, LLC, an Earth Systems Company (SEL) has <br />completed a preliminary evaluation of the potential effect of the proposed residential development’s <br />community well on adjacent, single use wells, if any. The below summary is based only on a preliminary <br />evaluation of the raw data collected during ambient conditions (i.e. prior to draw down of the <br />proposed community well), as well as direct observations documented during and following the <br />drawdown of the proposed community well. The results of ongoing modeling that has been initiated <br />using AQTESOLV (Advanced Aquifer Test Analysis Software; Aquifer Test SOVer) to determine the <br />transmissivity and storativity, which, once determined, will be input into the NCDEQ-DWR Reverse- <br />Time Drawdown Analysis to calculate drawdowns at varying distances from <br />the proposed community well. The results of this analysis will be provided <br />upon completion of the modeling, which are expected to support the results <br />of the raw data analysis detailed below, which clearly show that even <br />significant withdrawals from the Proposed Community Well have no impacts <br />on neither shallow, nor deep adjacent wells. <br />Background/ambient conditions: <br />Ambient conditions are those that are currently, typically occuring, without <br />any new inputs. As shown in the attached Figure 1, the Rigsbee Well is <br />approximately 600 feet west/northwest of the Proposed Community Well <br />and the Griffin Well is approximately 660 feet north/northeast of the <br />Proposed Community Well. Ambient data were collected at all three wells <br />between 13 and 28 June 2025 using Well Sounder 2010 PRO devices, which <br />are manufactured by Eno Scientific, LLC in Hillsboro, NC. As depicted in <br />Illustration 1, these devices use sound waves to record static water surface <br />depths within wells, relative to ground level and/or well head elevations. <br />Additional ambient data was collected at the Rigsbee and Griffin Wells prior <br />to, during and after the drawdown testing of the Proposed Community Well, <br />which was completed between 1100 on 16 July 2025 and 1100 on 17 July <br />2025. Data collection at the Rigsbee and Griffin Wells continued to be <br />collected until 25 July 2025. Illustration 1 <br />56