Summary
CRWA conducted water
quality monitoring on Sawins Brook on four occasions: 1) November 9, 2006
– a wet weather monitoring event, 2) November 20, 2006 – a dry weather
monitoring event, 3) December 12, 2006 – a dry weather
monitoring event, and 4) May 25, 2007 – a dry weather monitoring event.
Samples were collected at seven or eight
sites along Sawins Brook and analyzed for E.
coli bacteria, total suspended solids, and total phosphorus.
Additionally, in-situ parameters, such as pH, dissolved oxygen, specific conductivity and water
temperature, were measured. Click
here for
a sampling map.
During all four monitoring events, E.
coli levels at most of the monitoring locations exceeded the
Massachusetts Surface Water Quality Standard for swimming, 126cfu/100mL, and a majority exceeded
the state standard for boating, 630cfu/100mL. The highest concentration of 8,600cfu/100mL occurred on the
November 20th (dry weather monitoring that was affected by an earlier storm) and
December 12th (dry weather) events. In addition, dissolved oxygen levels in the brook were relatively
low during the first two monitoring events. Click here
for water quality monitoring results. Similar
to Canterbury Brook , CRWA observed a large of
amount of trash and debris especially in the stretch of brook from Site
SAW1 to SAW2. See
sampling
map , sampling site descriptions , Sawins
Brook photos , and water quality monitoring
results for more information about Sawins Brook.
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WATERSHED INFO
