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Boston Harbor
and Massachusetts Bay
MWRA Environmental Quality
Department
Contingency Plan Historical Exceedances
MWRA's NPDES discharge permit requires MWRA to report Contingency
Plan exceedances to regulatory agencies and the public. The exceedances
are triggered by unusual or unexpected results of effluent or ambient
monitoring. Effluent monitoring takes place in the treatment plant,
while ambient monitoring examines the environment surrounding the
outfall.
Caution and Warning Level Exceedances
Time of Exceedance |
|
Type of Exceedance |
May 18, 2009 |
|
Ambient Alexandrium (red tide) |
May 16, 2008 |
|
Ambient Alexandrium (red tide) |
Winter/Spring
2007 |
|
Phaeocystis |
Summer
2006 |
|
Phaeocystis |
| Summer
2006 |
|
Chlorophyll |
August 21, 2006 |
|
Effluent Menidia (inland silverside) |
May 17, 2006 |
|
Ambient Alexandrium (red tide) |
Summer 2005 |
|
Ambient Phaeocystis pouchetii (algae) |
September 15, 2005 |
|
Effluent Arbacia (sea urchin) |
May 11, 2005
|
|
Ambient Alexandrium (red tide) |
April 2, 2004
|
|
Effluent
fecal coliform |
Spring and Summer
2004 |
|
Ambient Phaeocystis pouchetii (algae) |
Summer 2003 |
|
Ambient Phaeocystis pouchetii (algae) |
Summer 2003 |
|
Ambient
mussel bioaccumulation |
Summer 2002
|
|
Ambient
PAH and chlordane |
May-August 2002 |
|
Ambient Phaeocystis pouchetii (algae) |
August 2002
|
|
Effluent
total suspended solids (monthly limit) |
August 24, 2002 |
|
Effluent
total suspended solids |
August 17, 2002
|
|
Effluent
total suspended solids |
2001 |
|
Ambient mussel bioaccumulation |
December 18, 2001 |
|
Effluent
fecal coliform |
April 2001 |
|
Effluent
toxicity |
January 2001
|
|
Effluent
toxicity |
December 14, 2000 |
|
Effluent
chlorine |
December 7, 2000 |
|
Effluent pH |
Fall 2000 |
|
Ambient chlorophyll |
October 2000 |
|
Ambient dissolved oxygen
percent saturation |
Many of our reports are in PDF format, which requires Adobe
Acrobat Reader®, a free program available from Adobe
Systems. To request a paper copy of any report, please contact
the MWRA Environmental Quality Department at 617-788-4601, or
e-mail us
at web.enquad@mwra.state.ma.us. |
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