PB Agenda Packet 3-4-26 - Laserfiche WebLink

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28 • Managed by individuals or companies that maintain Drinking Water Operator Certifications through DEQ Public Supply Well Siting • Where to get adequate yield: o Siting is based on topographic and lithographic trends, site geology, regional well trends, and pollutant setbacks. o Different rock types offer different yields o No matter the data you collect,you don't know until you drill. Often need to drill multiple wells to find one with suitable yield (about a gallon per minute per residence) • Regulatory requirements o Setbacks from potential sources of pollution ■ 100 feet away from sanitary sewage disposal systems, buildings, surface water, and other similar pollution sources ■ 200+feet away from more intense potential sources of pollution o A PG or PE must submit a sealed letter to NC DEQ certifying setbacks due diligence o Note: private wells only require 50'separation from septic systems, while public wells require 100'separation • Land use implications: o One public well can supply 49 private residences, which minimizes the land use impacts of wells and allows for more space for other uses (such as septic disposal, open space, or denser neighborhood construction) o In theory, a larger cluster of homes with one community well and lots of open space with potential for second or third wells is more resilient than homes spread farther apart each with their own well/ • Impacts on surrounding wells: o A single community well that serves 40 homes will have less of an impact on surrounding wells than 40 individual wells. Community wells have timers, maximum use, and state monitoring Public Supply Well Drilling • Drilling requires space for drill cuttings (sediment); lots of air pushes everything out at a high velocity Public Supply Well Yield and Water Quality Testing • Downhole video surveys are used to supplement well testing