| February 25, 2004 -- Vol. 5, No. 8
When does a cross-connection become a backflow incident?
Not just when the valve is opened!
Maybe humans can line up with their Rhesus relatives for pesticide testing if panel's recommendations prevail... and whether
health officer's human bathing tests in Maui will be double-blind probably
depends on "clothing optional" being specified.
EPA joins DC utility in hot water over lead issue.
Increase in Maryland groundwater radioactivity still a mystery.
Water groups continue full-court press to keep MTBE protective clause out of any federal legislation.
Goodyear plant officials concerned over cross connection
Leader, February 12)
As described, the valved connection between the
potable water system and a cooling water system fits
the classic definition of a "cross
connection." In this case, it apparently
took a deliberate or inadvertent opening of the
valve to allow "backflow" to occur. (But
was the valve always "leak-proof"?)
An interesting facet is that the cooling water
contamination manifested itself as a positive
coliform test; since cooling water systems often
have potent corrosion and algae inhibitors added,
it might be surprising to see the organisms
present. Color, odor, off-tastes might be more
likely indicators. There is no mention of a
backflow prevention device installed on the service
connection to the Goodyear plant...?
American Backflow Prevention Association's
annual conference will be May 9-12 in Long
|Water Quality Tasting
residents complain of skin problems from corrosion inhibitor
(Honolulu Star Bulletin, February 23)
Complaints may be related to the
county's switch from zinc
orthophosphate to phosphoric
acid. The change was made
to control water-corrosivity,
reduce the amount of lead
leaching and enable the water
utility to come into compliance
with SDWA lead
requirements. The chief
health officer thinks something
is amiss: he is recruiting
volunteers to take baths for him
(not with him!), some in the
phosphoric acid-treated water,
others in untreated water.
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