Final Environmental Impact Report - Whittier Bridge/I-95 ...

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Whittier Bridge/I-95 Improvement Project FEIR Chapter 2.0: Response to Comments on the Environmental Assessment/Draft Environmental Impact Report Table 2-1: Stormwater Outfalls (continued) Description of Discharge Salisbury (cont’d) Sheet flow on west side 7 of SB 8 Existing 12" Outfall 9 24" Outfall from Wet Basin 7B 10 Existing 48" Outfall Baseline Station Reference ST 28 to ST 33 Left ST 31+50 Right Nearest Down Gradient Resource Area Wetland L Wetland R Comments Existing drainage pattern to remain, BVW immediately adjacent to roadway Existing outfall will be diverted into proposed Wet Basin 7B ST 32 Right Wetland R Treatment provided in Basin ST 34+50 Right Wetland R 11 Existing 24" Outfall ST 40 Right Wetland R 12 Proposed 15" Outfall 13 Sheet flow on east side of NB ST 42+50 Right ST 33 To ST 52 Right Wetland R Wetland R 14 Existing 12" Outfall ST 45 Right Wetland R 15 Existing 18" Outfall 16 Existing 12" Outfall 17 Existing 24" Outfall 18 Existing 12" Outfall ST 47+50 Right ST 47+49 Right ST 49+75 Right ST 49+80 Right Wetland R Wetland R Wetland R Wetland R 19 Existing 24" Outfall ST 52 Right Wetland R 20 Existing 12" Outfall 21 Sheet flow on west side of SB ST 52+50 Right ST 39 to ST 52 Left Wetland R Wetland X 22 Existing 12" Outfall ST 47+50 Left Wetland X 23 Existing 12" Outfall ST 49+75 Left Wetland X 24 25 Sheet flow on west side of SB Sheet flow on east side of NB 26 Existing 15" Outfall ST 52 to ST 62 Left ST 55 to ST 68 Right ST 60+25 Right Wetland W Wetland S Wetland S 27 Existing 48" Outfall ST 67 Right Wetland S Discharge contains a mix of existing and proposed flows. Portion of flow includes storm water discharges from Wet Basin 7A and treatment provided in median swale. Discharge contains a mix of existing and proposed flows. Portion of flow includes treatment provided in median swale. Treatment provided in Median Swale and Sed Forebay Existing drainage pattern to remain, BVW immediately adjacent to roadway Existing outfall to remain, BVW located immediately adjacent to discharge. Treatment provided in Median Swale Existing outfall to remain, BVW located immediately adjacent to discharge. Treatment provided in Median Swale Existing outfall to remain, BVW located immediately adjacent to discharge. Discharge contains a mix of existing and proposed flows. Portion of flow includes treatment provided in median swale. Discharge Point is immediately up gradient of BVW Existing drainage pattern to remain, BVW immediately adjacent to roadway Existing outfall to remain, BVW located immediately adjacent to discharge. Existing outfall to remain, BVW located immediately adjacent to discharge. Existing drainage pattern to remain, BVW immediately adjacent to roadway Existing drainage pattern to remain, BVW immediately adjacent to roadway Discharge contains a mix of existing and proposed flows. Portion of flow includes treatment provided in median swale. Discharge contains a mix of existing and proposed flows. Portion of flow includes treatment provided in BMP 9, and treatment provided in median swale. 2-20
Whittier Bridge/I-95 Improvement Project FEIR Chapter 2.0: Response to Comments on the Environmental Assessment/Draft Environmental Impact Report Table 2-1: Stormwater Outfalls (continued) Description of Discharge Salisbury (cont’d) Sheet flow on east side 28 of NB Sheet flow on west side 29 of SB Baseline Station Reference ST 68 to ST 72 Right ST 85 to ST 95 Left Nearest Down Gradient Resource Area Isolated Wetland U Wetland 5 30 Existing 48" Outfall ST 105 Right Wetland 2 Notes: Refer to Stormwater Management Plans dated November 16, 2011 (Revised through February 2012) (Excludes discharges from the proposed bridge scuppers associated with Whittier Bridge) Comments Existing drainage pattern to remain, BVW immediately adjacent to roadway Existing drainage pattern to remain, BVW immediately adjacent to roadway Discharge contains a mix of existing and proposed flows. Portion of flow includes treatment provided in median swale and deep sump CB's. Response: MassDOT has submitted a table (Table 2-1) to each conservation commission that identifies every stormwater discharge within the project limits. The proposed TSS removal rates for every subcatchment area and resultant level of TSS removal achieved at each resource area with a distinction between New Development and Redevelopment has also been tabulated and included in the Stormwater Report. DEP-11: While the 80% TSS removal rate requirement may be met using the macro-approach, all new discharge points must receive at least some level of TSS treatment to comply with 310 CMR 10.05(6)(k)(I) and 314 CMR 9.06(6)(a)(l) and disproportionate impact to any one receiving wetland or water must be avoided for both redevelopment and new development drainage. Response: All proposed discharge points will receive at least some level of TSS treatment, with the exception of bridge scuppers as discussed in the previous DEP comment. The proposed stormwater management system has been designed such that at least 80% TSS removal will be achieved for the new development portion of the project as evaluated at each resources area. This methodology was specifically incorporated into the design in an effort to avoid disproportionate impacts to any individual resource area. Additional treatment measures are incorporated for redevelopment portions of the project to the maximum extent practicable and improve existing conditions. DEP-12: The Merrimack River is designated as a shellfish growing area (where taking of shellfish is currently prohibited) on easterly side of the Whittier Bridge. As such, the Merrimack River is a critical area for purposes of stormwater discharges pursuant to 310 CMR 10.05(6)(k)(6) and 314 CMR 9.06(6)(a)(6). MassDOT should explore opportunities to increase stormwater treatment from landside drainage directed to the Merrimack River to comply with 310 CMR 10.05(6)(k)(6) and 314 CMR 9.06(6)(a)(6) requirements. All headwalls, splash pads, aprons, or preformed scour holes for stormwater management may not be located in land under water, bordering vegetated wetlands, or salt marsh pursuant to wetland regulations at 310 CMR 10.05(6)(k). Response: The proposed stormwater management system for this section of the project includes a proposed infiltration basin located on the east side of I-95 in Newburyport. The proposed basin will provide water quality treatment for a portion of the projects total discharges to the Merrimack River, which has been identified as immediately upstream of the shellfish growing area. The proposed infiltration basin will be sized to include an equivalent amount of water quality volume that represents at least 1-inch of water quality treatment for the New Development portion of the project tributary to 2-21
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FINAL ENVIRONMENTAL IMPACT REPORT E
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Whittier Bridge/I-95 Improvement Pr
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EEA#14427 DEIR Certificate December
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EEA #14427 DEIR Certificate Decembe
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EEA#l4427 DEIR Certificate December
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EEA#I4427 DEIR Certificate December
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WETLAND E WETLAND F WETLAND G WETLA
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Deval L. Patrick GOVERNOR rJJie Com
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Thank you for the opportunity to co
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ESSEX NATIONAL HERITAGE COMMISSION
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In the period leading up to the sub
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construction is not adequate to ens
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to limit turbidity impact from dewa
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For infiltration basin and trench s
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not acceptable to meet regulatory r
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ide lot that is also being expanded
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MassWi/d/ile December 20, 2011 Comm
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Patel, Purvi {_E_EA .... } _ From:
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process. Ifthe project avoids simul
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THE COMMONWEALTH OF MASSACHUSETTS E
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imack Valley ning Commission plan *
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Mayor Thatcher w. Kezer III Town Ha
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are connected are there any other p
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Revised 12/19/11 Town ofSalisbury's
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Neil J. Harrington Town Manager Tow
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Secretary Richard K. Sullivan, Jr.
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Coastal Trails Coalition December 2
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Patel. Purvi~ _ From: Sent: To: Cc:
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1. The Whittier Bridge Replacement
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Whittier Bridge and 1-95 reconstruc
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forested and open character, though
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On the cost front, we are in an eco
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42 Prospect Street Newburyport, Mas
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12-~:TII ~~.. MASSACHUSETTSHIGHWAYD
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Patel. Purvi~ _ From: Sent: To: Cc:
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argument or disagreement. We have p
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Patel. Purvi (.... E_EA .... ) _ Fr
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TO: Pamela S. Stephensen, Division
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Patel, Purvi ~ ...... _ From: Sent:
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TO: Pamela S. Stephenson, Division
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PUBLIC MEETING WEDNESDAY, DECEMBER
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3 SPEAKER INDEX Name Page Karen Eme
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Whittier Bridge/I‐95 Improvement
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Spill Prevention and Response MassD
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Appendix: Best Management Practices
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The Commonwealth Of Massachusetts M
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downstream of the existing bridge w
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Appendix 1 - Tables 1, 2, and 3 Tab
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Table 4. Summary of Model Simulatio
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process. If the project avoids simu
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anadromous fish including American
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Conclusions In summary, we recommen
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