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9 <br /> 1 Slide #11 <br /> Comparison of Treatment Methods <br /> Basic Septic Tank Soil <br /> Primary Dispersal into Final <br /> Onsite Treatment Soil Treatment <br /> System DSE DSE <br /> Advanced Septic Tank Soil <br /> Onsite Primary Advanced Pre- Dispersal into Final <br /> Treatment Treatment 1 Soil L Treatment <br /> System DSE TS-1 or TS-11 T5-1 or TS-II <br /> Package Septic Tank <br /> Treatment Primary Advanced Pre- Discharge to <br /> Treatment Treatment Ditch/Stream <br /> System DSE <br /> TS-1 or T5-I1 <br /> 2 <br /> 3 Commissioner Portie-Ascott asked if a regional package treatment system works the <br /> 4 same way as the package treatment system shown on the slide. <br /> 5 Tony Whitaker said that the term may refer to a large system that serves more than one <br /> 6 neighborhood or even a region of a county. <br /> 7 Vice-Chair Hamilton asked if there is a difference between the advanced pretreatment <br /> 8 system for the advanced on-site system and for the package treatment system. <br /> 9 Tony Whitaker said it would depend on the size. He said there would not necessarily <br /> 10 have to be a difference because the manufacturers that make the advanced pretreatment units <br /> 11 make them in different scales for individual homes vs. neighborhoods. <br /> 12 Vice-Chair Hamilton asked if one of the differences is that the package treatment system <br /> 13 does not include the extra opportunity to have the soils clean the water. <br /> 14 Tony Whitaker said that is correct, but virtually all discharge systems are required to go <br /> 15 to these TS1 or TS2 levels, and often use radiation or ultraviolet treatment for disinfection. <br /> 16 Commissioner Carter asked if advanced pre-treatment systems address PFAS and <br /> 17 heavy metals. <br /> 18 Tony Whitaker explained that these systems aren't designed for heavy metals, though <br /> 19 some might be bound in treatment. <br /> 20 Commissioner McKee asked if the water is theoretically drinkable after advanced pre- <br /> 21 treatment. <br /> 22 Tony Whitaker said it is not quite up to drinking water standards, which would be off the <br /> 23 chart of the last slide, but it is getting close. <br /> 24 <br /> 25 The Board recessed for a break at 9:05 AM. <br /> 26 <br /> 27 <br /> 28 <br /> 29 <br /> 30 <br />