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On
March 10, approximately two weeks after Big Dig sediments invaded
the 2-acre vernal pool north of the Sawcut Notch path in the Blue
Hills Reservation, Michele Cobban-Barden, Water Quality Director for
the Neponset River Watershed Assn.,
took water samples for testing at the pool and at a nearby unimpacted
pool on the north slope of Rattlesnake Hill. Following are the test
results, originating at the lab of the Charles River Watershed Assn.
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Rattlesnake
Hill Pool
(unimpacted)
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Sawcut
Notch Pool (impacted) |
Salinity
(parts per thousand)
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0 |
.3 |
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Total
Suspended Solids
(milligrams/liter)
|
<4 |
10-12 |
Total
Dissolved Solids
(milligrams/liter) |
12 |
319-323 |
Conductivity
(microsiemens/centimeter) |
27 |
660-674 |
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The figures
for the impacted pool show levels of these parameters considered highly
detrimental to aquatic life.
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Rattlesnake Hill Pool
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Sawcut Notch Pool |
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