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SPANGLER <br /> ENVIRONMENTAL <br /> Environmental Consulting I Litigation Support I Environmental Services <br /> 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 /> ACCURATEGROUND the proposed community well. The results of this analysis will be provided <br /> WATER DATA <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 /> SAND EEO <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 /> PLAIP <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 /> Illustration 1 collected until 25 July 2025. <br /> www.spanglerenvironmental.comRaleigh I Charlotte I Charleston Tampa <br /> 866-772-6453 <br />