General Electric Aviation (GE)
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EXHIBIT 4 NPDES Permit No. MA0003905 Response to Comment Response to Comments on Draft National Pollutant Discharge Elimination System (NPDES) Permit No. MA0003905 - General Electric Aviation (GE) Introduction ....................................................................................................................................3 Changes to Draft Permit ...............................................................................................................4 Comment 1.1: ...............................................................................................................................12 2. Facility Background...............................................................................................................13 Comment 2.1: Lynn Facility History and Operations ..............................................................13 Comment 2.2: Economic Considerations ................................................................................14 Comment 2.3: Environmental Good Citizen ...........................................................................15 Comment 2.4: Permitting History ............................................................................................16 Comment 2.5: Recent Changes to Drainage at the Facility .....................................................18 3. EPA’s Assumptions about Groundwater Contamination are not Accurate; as a Result, EPA’s Limits and Conditions Derived from these Assumptions are not Appropriate. ...........................................................................................................................24 Comment 3.1: EPA’s Assumptions .........................................................................................24 Comment 3.2: EPA’s Assumptions Overlook GE’s Extensive Pipe Relining and Replacement Effort ........................................................................................................29 Comment 3.3: EPA’s Assumption about Contaminated Groundwater at Outfalls 014, 018 and 020 do not Reflect Key Changes to the Facility ..............................................30 Comment 3.4: EPA’s Assumptions about Groundwater Quality Overlook GE’s Extensive Site Remediation Activities. .........................................................................31 4. Numeric Limits Applied to Wet Weather Flows are not Appropriate. ..............................38 Comment 4.1: Numeric Water Quality-based Limits are not Feasible or Necessary and in any Event are not Justified Here. ........................................................................39 Comment 4.2: EPA Lacks a Legitimate Technical Basis to Derive or Impose Numeric Technology-Based Limits. ............................................................................................43 5. Monitoring Requirements are Burdensome and Unreasonable. .........................................57 Comment 5.1: Chemical Monitoring. ......................................................................................58 Comment 5.2: WET Testing. ...................................................................................................73 Comment 5.3: Bioaccumulation Study. ...................................................................................78 6. EPA’s Assumption that there is no Available Dilution in the Receiving Water is Overly Conservative and not Supported Factually. ...........................................................81 Comment 6.1: Qualitative Assessment Supports Allowance for Dilution and Mixing. ..........82 Comment 6.2: Quantitative Evaluation Supports Allowance for Dilution and Mixing. .........85 7. EPA must Correct Errors in its Approach to Assigning Limits and Monitoring Conditions on GE’s Noncontact Cooling Water and Unused River Water Discharges. ..............................................................................................................................87 Comment 7.1: Outfall 018 does not Discharge Stormwater and, in Turn, Should not be Assigned Wet Weather Limits or Conditions. ..........................................................87 Comment 7.2: Any Groundwater Infiltration into Outfalls 014, 018 and 020 is de minimis. .........................................................................................................................88 Comment 7.3: The Copper and Selenium Limits at Outfall 018 limits are not Appropriate. ...................................................................................................................88 Page 1 of 242 NPDES Permit No. MA0003905 Response to Comment 8. Antidegradation Authorization is Neither Necessary nor Appropriate for this NPDES Renewal Proceeding. ................................................................................................90 9. The Draft Permit would Result in Redundant and Internally Inconsistent Requirements that do not Reflect best Professional Judgment, are not Necessary in Order to Achieve Water Quality Objectives, and are Infeasible to Implement. .........92 Comment 9.1: Wet and Dry Weather Flows. ...........................................................................93 Comment 9.2: Allowable and Non-Allowable Stormwater. ....................................................95 Comment 9.3: MEP. ................................................................................................................96 Comment 9.4: During Dry Weather Conditions, the CDTS Reflects Best Available Technology and is Protective of Water Quality. ...........................................................97 Comment 9.5: The CDTS is not Designed to Handle Wet Weather Flows. ............................98 Comment 9.6: Neither the Prohibition nor the MEP Requirement is Necessary to Achieve Water Quality Objectives. ...............................................................................99 10. EPA’s Proposed Thermal Limits for Outfalls 018 and 014 are more Stringent than Warranted by Applicable Law. .................................................................................100 Comment 10.1: Overview of EPA’s Approach to Deriving the Proposed Thermal Limits. ..........................................................................................................................100 Comment 10.2: EPA’s Proposed Determination that Retrofitting Closed-Cycle Cooling Reflects BAT for the Facility is Fundamentally Flawed. ..............................107 Comment 10.3: EPA’s Determination that Alternative Thermal Limits of 90°F for Outfalls 018 and 014 are Necessary to Assure the Protection and Propagation of a Balanced, Indigenous Population in the Saugus River is Flawed. .......................120 11. EPA’s Proposed BTA Determination for the Facility’s CWIS Require Reconsideration. ...................................................................................................................137 Comment 11.1: Background. .................................................................................................137 Comment 11.2: GE’s Proposed Operational Measures. ........................................................151 Comment 11.3: EPA’s Proposed BTA Determination. .........................................................155 Comment 11.4: EPA’s Analysis Mischaracterizes the Impacts of the Existing Power Plant and Test Cell CWISs. .........................................................................................167 Comment 11.5: EPA Incorrectly Assumed that Impingement and Entrainment from the CWIS, at the Levels Estimated by the Agency, would cause Adverse Environmental Impact. ................................................................................................177 Comment 11.6: EPA’s Assumption that Achieving the Predicted Reductions in Impingement and Entrainment will Produce Appreciable Benefits for the Saugus River is Unfounded. ........................................................................................187 Comment 11.7: EPA’s Erred in Concluding that Retrofitting the Power Plant with Closed-Cycle Cooling is Technologically and Economically Available Cooling Water Intake Structure Technology for the Facility. ...................................................190 Comment 11.8: EPA’s Proposal to Require the Power Plant CWIS to Retrofit fine Mesh Wedgewire Screens Ignored Technical Impediments and Significant Costs. ...........................................................................................................................195 Comment 11.9: EPA’s Proposed BTA Determination for the Test Cell CWIS Requires Reconsideration. ...........................................................................................203 Comment 11.10: The Proposed Monitoring Requirements for Impingement and Entrainment are Unreasonably Burdensome and Unnecessary to Ensure Proper Operation and Maintenance of BTA Technologies. ....................................................205 Page 2 of 242 NPDES Permit No. MA0003905 Response to Comment 12. EPA Needs to Correct and/or Clarify Certain Aspects of the Draft Permit. .................210 13. Some of EPA’s Expectations and Assumptions Related to Operations and Practices at the Facility are not Accurate and Need to be Corrected. ............................215 Comment 13.1: Treatment by GAC Alone is more Effective than Treatment using both the GAC and DAF. ..............................................................................................215 Comment 13.2: GE has Concerns about the Feasibility, Effectiveness