1. From MyRWA Baseline data alone, Alewife looks like Aberjona.

Seen in the context of data from other baseline sites, ALB006 baseline bacteria data looks a lot like other mid-size tributaries in the Mystic. Note that with baseline data alone, Alewife (column 4) resembles ABR028 (column 2) quite closely, for instance.

It is the addition of MWRA data for Alewife Brook that drags the Report Card grade significantly lower. (See next section.)

2. When you add MWRA data (excluding MWRA308), the average percentage of exceedances goes up, which explains lower Report Card grades for Alewife. Compare ALB006 (left) with the next 6 sites.

3. MWRA308 stands out with exceptionally high values (see next section)

4. MWRA308, near CAM401A, shows dramatic dry weather violations

For 2 years, MWRA sampled at MWRA308 near outfall at CAM401A. This was part of their wet-weather sampling program, when they went out before and for days after storms. This data is not included in the Report Card calculations, for consistency with previous years.

This site stands out as having much higher values in the graphs above and shows high dry weather concentrations of E. coli.

Worthy of follow up.

Maps

MWRA 308 Location of MWRA308 sampling location

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MWRA and MyRWA Baseline sites

MWRA and MyRWA Baseline sampling sites

5. Little River and Little Pond in-stream/pond samples excluding MWRA174

I would like better to understand conditions between MWRA174 and WIB001.