01/27/2024 BOARD OF HEALTH Minutes

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starts to drop off. The one we have at the test center we discontinued and did an autopsy on it to see what's going on with it. It's better than nothing. Mr. Harrinton: Was it 50%? CHAIR BAUMGAERTEL : At its best Mr. Harrington: At its best but not on average? CHAIR BAUMGAERTEL : Not on average, no. If you look at the data across time, on average,the removals hovered in the 50% area but not consistently. Sometimes it was less reduction and sometimes it was more. Depends on incoming waste water as well. Mr. Harrington: I don't think there is going to be any issue with use. It is going to get used. All of these units will stay full. I suppose there is a chance of overuse. Ms. Patel: Makes me wonder why DEP would approve something like this despite what we know Ms. Willander: They're getting different results at the test locations aren't they? Based on that article it sounds like they're getting better treatment than you're getting at your test site. Mr. Harrington: It says up to 72% removal Ms. Patel: I would question the longevity of that based on what Brian's been saying. The article can be successful but we have to refute it with when it was seen. CHAIR BAUMGAERTEL : So we have had something to do with all 15 of those installations and I know how they're performing and the article characterizes it not necessarily correctly. Which pains me to say because this has been a subject of the research test center for the past 5 years. To have a lot of that research to come to the conclusion that it's not really a workable model. That said,down in Long Island with the same design they're moving ahead with using down there. Ms. Patel: So I understand, I'm assuming that it is 3 layer that they're proposing. Is it tested on the amounts of layers that you use? CHAIR BAUMGAERTEL : This is basically the same design that we use. There is a little bit of difference with pea stone layer at the bottom. This was exactly the spec that was used Mr. Harrington: They want to do all concrete chambers, because it's going to be driven over so the pressure distribution lines need to be protected by concrete.The spraying of effluent through the smaller diameter perforations and the pressurized laterals will aerate the effluent which is hopeful that aeration is part of the denitrification process. CHAIR BAUMGAERTEL : So that's not the only option, you can do concrete chambers, Elgin systems ? They have an NSF 245 approval.Which was basically that design 18/18 or it might have been 20/12. Mr. Harrington: They set their bundles on top of other layers.