Chrp managers meeting october 2009
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CHRP/Managers Meeting October 2009. Angelo Liberti, Chief Surface Water Protection Office of Water Resources 401.222.4700 ext 7225 [email protected] NBC CSO Project. Phase I tunnel - operational Nov 2008 Post storm monitoring Re-assess Rainfall Closure Criteria

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Chrp managers meeting october 2009
CHRP/Managers Meeting October 2009

Angelo Liberti, Chief

Surface Water Protection

Office of Water Resources

401.222.4700 ext 7225

[email protected]


Nbc cso project
NBC CSO Project

  • Phase I tunnel - operational Nov 2008

    • Post storm monitoring

    • Re-assess Rainfall Closure Criteria

  • Phase II - preliminary design completed


Current plan for managing nutrients from wwtf
Current Plan for Managing Nutrients From WWTF

  • 50% Reduction from RI WWTFs

    • DEM permits issued – June 2005

  • Comparable reductions from MA WWTFs


Revised wwtf nitrogen limits
Revised WWTF Nitrogen Limits

  • 8 mg/l

  • No. Attleborough

  • Attleboro

  • Grafton

  • Uxbridge

  • Northbridge

    • (max extent)

  • East Providence

  • Cranston

  • West Warwick

  • Warwick

  • Smithfield (10 mg/l)

  • Burrillville (max extent)

  • 5 mg/l

    • UBWPAD

    • Woonsocket

      • (3 mg/l)

    • NBC-Fields Pt.

    • NBC Bucklin Pt.

    • East Greenwich

- Warren – anticipated to address impacts to the Palmer River

  • Limits May – October, require operation of treatment to remove N to max extent possible November-April


Current status of load reduction efforts
Current Status of Load Reduction Efforts

  • 8 - WWTFs have complete upgrades

    • (2 require additional modifications)

  • 1 - Under construction

    • NBC Fields Point (completion by 12/31/2013)

  • 1 – Planning Underway

    • Woonsocket (Plan was due 8/09, construction by 3/2014)

  • 2 - Design Underway

    • NBC Bucklin Point

    • East Providence (due 6/01/10, construction by 9/2012

      Approximately 30% reduction in RI WWTF load achieved in 2005. Next significant reduction May 2014



  • Status of compliance with revised permit limits for n ri wwtfs
    Status of Compliance with Revised Permit limits for NRI WWTFs

    * Excludes May data (19.5, 13 mg/l)



    Nitrogen reduction projections
    Nitrogen Reduction Projections

    • Nitrogen removal at 11 RI WWTFs - reduces their summer season nitrogen loading by 65%, dropping to 48% as WWTF flows reach approved design flows.




    Table 4: Approved WWTF design flows and design flows used for the load evaluations.

    Table 4: Approved WWTF design flows and design flows used for the load evaluations.

    Evaluation of WWTF Load Reductions



    Loading condition vs cost
    Loading Condition Vs. Cost for the load evaluations.


    Anticipated ri wwtf load reductions
    Anticipated RI WWTF Load Reductions for the load evaluations.


    Allowable Loading Condition for the load evaluations.

    Average Chlorophyll vs N Load

    70

    32 X

    y = 0.62 x + 6.32

    2

    R

    = 0.94

    60

    50

    16 X

    40

    Chlorophyll a (ug/l)

    30

    4 X

    20

    8 X

    2 X

    10

    1 X

    C

    0

    0

    10

    20

    30

    40

    50

    60

    70

    80

    90

    100

    2

    Nitrogen Load (mmol/m

    /d)