This week's NEWS
Future of MTBE-bans is cloudy....at best. Stage 2 rule discussed by SAB; adoption not likely until 2003. Protection of drinking water facilities against terrorist threats continues to get high priority attention. States are moving on "health risk levels" for water contaminants. Antiquity find in London leads to new slogan for corrosion-control: "We guarantee your parts for 1900 years!"
Minnesota seeks input on health risk
limits for groundwater contaminants
Minnesota's health risk limits (HRL) process sets
risk assessment numbers for groundwater
contaminants, which then may be used by various
health and environmental agencies in the state for
developing regulations. Input is being sought
on the scientific and policy basis for derivation of
HRLs. A list of important issues is provided.
risk assessors set Public Health Goal for simazine
at 4 ppb
The final PHG document for simazine is noteworthy
for several significant changes made by OEHHA from
its earlier proposed draft PHG, including: (1)
the toxicological basis it had previously used for
simazine was changed from a cancer endpoint using
linear risk calculation to a non-cancer endpoint of
"reduced body weight"; (2) the PHG
was increased from 0.4 to 4 ppb, which is the
current California and EPA MCL; and (3) the change was
based on OEHHA's listening to and involvement in
USEPA's recent reviews of atrazine and related
compounds. A minor but important new touch has been
added with the words "NOT A REGULATORY
STANDARD" emblazoned across the front cover of
the technical document.
November 7 public hearing on adding
uranium and filter backwash recycling rule
requirements to state regulations (pdf file, 31
Request for proposals
radionuclides analyses issued by Minnesota Dept of
from LUST (Leaking Underground Storage Tanks) is
topic of proposed Arizona DEQ policy document;
comments sought by October 31
proposes changes in MCLs for six chemicals including
atrazine and cyanide (pdf file)
An early draft of the proposed regulation changes
includes new MCLs, DLRs, and public notice language
for the six chemicals. All of the proposed new
MCLs are lower, which is expected, and are based on
recently published Public Health Goals for these
chemicals. The atrazine MCL change is interesting in
light of the just-adopted PHG for a similar
compound, simazine. (See item above.)
DEQ strives for public involvement in water quality
provides rapid update on SAB meeting on Stage 2 Disinfectant/Disinfection
In addition to the SAB meeting report, it is
projected that the Final Stage 2 rule will be
delayed until mid-2003. OMB has released the LT1ESWTR, which means that it should be published soon.
AwwaRF has just published an important report,
"Health Effects and Occurrence of Disinfectant
By-products" by Roberta Bull, Richard Bull,
Stuart Krasner and Phillipe Daniel. It can be
obtained by calling AwwaRF at 888-844-5082
(Subscribers only) or AWWA at 800-926-7337
(Non-AwwaRF subscribers). The order number is No.
Lead and Copper
Roman waterwheel recovered intact
(London Daily Telegraph,
Our publisher's diving experience suggests that the
lack of dissolved oxygen is a big factor in
preventing corrosion of metals in water bodies,
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