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Proposed Revisions to MWRA’s Ambient Monitoring Plan for Enhanced Environmental Quality

The Massachusetts Water Resources Authority (MWRA) is seeking revisions to its Ambient Monitoring Plan, focusing on effluent floatables sampling, water column monitoring design, and sediment monitoring design. Changes aim to refine the number of sampling sites, sampling schedules, and measured parameters to better understand the region of influence of the outfall, using reference sites for comparison. Notably, core effluent monitoring, contingency reporting, and various forms of biological monitoring will remain unchanged, ensuring robust environmental protection while enhancing monitoring effectiveness.

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Proposed Revisions to MWRA’s Ambient Monitoring Plan for Enhanced Environmental Quality

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  1. Proposed Revisions to MWRA’s Ambient Monitoring Plan: IntroductionAndrea RexDirector Environmental Quality DeptMWRAOutfall Monitoring Science Advisory PanelJune 29, 2009

  2. MWRA requesting revisions: • Effluent floatables sampling • Water column monitoring design • Sediment monitoring design Changes requested to number of sampling sites, sampling schedule, and parameters measured Goal: Study focused on potential region of influence of outfall, with reference sites for comparison.

  3. NO changes proposed to: • Virtually all effluent monitoring remains the same • Contingency plan reporting • Modeling • Fish and shellfish monitoring • Red tide responsive monitoring • Continuous monitoring Cape Ann (GoMOOS A) and nearfield (Buoy 44013) • Indicator bacteria monitoring around the outfall • Harbor and river monitoring

  4. Bacteria monitoring locations Fecal coliform and Enterococcus Monthly sampling Adverse condition sampling

  5. Alexandrium (Red tide) rapid response surveys

  6. OMTF monitoring questions answered: effluent

  7. OMTF Monitoring Questions Answered : Dilution, transport

  8. OMTF Monitoring Questions Answered : Dilution, transport, DO, phytoplankton

  9. OMTF Monitoring questions answered: Phytoplankton, zooplankton

  10. OMTF Monitoring questions: sediments

  11. OMTF Monitoring questions answered: sediments

  12. OMTF Questions: Fish and shellfish

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