Here’s the agenda for the event, and look for updates throughout the morning on data pertaining to odor, in-home test results and more.
Rosen: Sampling 20 to 30 homes in a pressure zone (an area defined by the water company) should be demonstrative of the chemical levels of all homes in that zone.
Rosen: 2 questions focused on for design of further study: 1. How confident can I be that the water in my home is less than the screening level? And 2. What percentage of the homes are above any particular concentration?
Jeff Rosen, statistician and WV TAP team leader: Believe there are 86,866 residential customers throughout nine-county affected area. It would cost $635 million to test all of them; sampling method needed.
Professor Whelton just posted a one-page summary of the WV TAP team’s finding’s covered in today’s presentation:
West Virginia American Water confirmed WV TAP belief that filters at the Elk River treatment plant were leaching small amounts of MCHM: http://www.charlestondailymail.com/article/20140325/DM01/140329659
Neslund: There are “tentatively identified compounds” they had a little trouble identifying. Needed extra tests, which led to discovery of MCHM in filtered water
Dr. Charles Neslund with Eurofins discusses how the labs determine what exact compounds they find using a chromatograph (a chemical detection device.)
Eurofins labs talking now about analysis of MCHM and chemicals involved in the spill: http://www.dhsem.wv.gov/WVTAP/News/Pages/Eurofins-Environmental-Joins-the-WV-TAP-Project-Team-as-a-Presenter-in-Charleston,-West-Virginia;-Expert-Health-Effects.aspx
Whelton: No relationship found between MCHM, where it’s found in the home and the temperature.
Whelton: Largest amount of MCHM detected was 6.1 ppb; 9 of 10 homes showed levels less than 2.2 ppb.
Whelton: Detected chlorine odor in 9 of 10 homes, “sweet” odor in 7 homes, licorice in 3 homes, musty odor in 2 homes (samples Feb.11-18)
Whelton: As expected, water quality differences were detected inside the homes.
Whelton: After the spill, people living in 10 homes surveyed greatly reduced usage of tap water. (Not sure that’s new to anyone, but…)
Moving on to Professor Andrew Whelton to hear about results of in-home testing program.
McGuire: Panel study backs up West Virginian’s complaints they could smell the chemical even though West Virginia American Water Co. said the was a non-detectable amount of the chemical in the water.
Here’s the entire packet of findings published by Professor McGuire recently: http://www.dhsem.wv.gov/WVTAP/test-results/Documents/POSTED_WVTAP%20Odor%20Expert%20Panel%20TechMemov2%20031714.pdf
For what it’s worth, a team from Virginia Tech found a different odor threshold (how much is in the water before you can smell it) than Professor McGuire: http://www.charlestondailymail.com/article/20140327/DM01/140329528/1276
Professor McGuire discussing difference between crude MCHM and MCHM as it pertains to smell.
Right now we’re hearing from Professor Mike McGuire, who’s discussing the amount of MCHM in the water there needs to be before people can smell it.
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