Minutes 11-14-2025-Work Session - Laserfiche WebLink

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9 Slide #11 Comparison of Treatment Methods Basic Septic Tank Soil Primar Dispersal into Final Onsite Treatment p Soil Treatment System DSE DSE Advanced Septic Tank Soil Onsite Primary Advanced Pre- Dispersal into Final Treatment Treatment Soil Treatment System DSE TS-I or TS-I I TS-I or TS-II Package Septic Tank Treatment Primary [A�dvancecl Pre- Discharge to Treatment eatment Ditch/Stream System DSE TS-I or TS-II Commissioner Portie-Ascott asked if a regional package treatment system works the same way as the package treatment system shown on the slide. Tony Whitaker said that the term may refer to a large system that serves more than one neighborhood or even a region of a county. Vice-Chair Hamilton asked if there is a difference between the advanced pretreatment system for the advanced on-site system and for the package treatment system. Tony Whitaker said it would depend on the size. He said there would not necessarily have to be a difference because the manufacturers that make the advanced pretreatment units make them in different scales for individual homes vs. neighborhoods. Vice-Chair Hamilton asked if one of the differences is that the package treatment system does not include the extra opportunity to have the soils clean the water. Tony Whitaker said that is correct, but virtually all discharge systems are required to go to these TS1 or TS2 levels, and often use radiation or ultraviolet treatment for disinfection. Commissioner Carter asked if advanced pre-treatment systems address PFAS and heavy metals. Tony Whitaker explained that these systems aren't designed for heavy metals, though some might be bound in treatment. Commissioner McKee asked if the water is theoretically drinkable after advanced pre- treatment. Tony Whitaker said it is not quite up to drinking water standards, which would be off the chart of the last slide, but it is getting close. The Board recessed for a break at 9:05 AM.