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

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<strong>Whittier</strong> <strong>Bridge</strong>/I-<strong>95</strong> Improvement Project FEIR<br />

Chapter 2.0: Response to Comments on the <strong>Environmental</strong> Assessment/Draft <strong>Environmental</strong> <strong>Impact</strong> <strong>Report</strong><br />

Table 2-1:<br />

Stormwater Outfalls<br />

Description of<br />

Discharge<br />

Newburyport<br />

Proposed 12"<br />

1 Connection - Inf Basin<br />

11<br />

Baseline<br />

Station<br />

Reference<br />

ST 112+50<br />

Right<br />

Nearest Down<br />

Gradient<br />

Resource Area<br />

2 Proposed 42" Outfall ST 161 Left Merrimack River<br />

3 Existing 36" Outfall<br />

ST 161+25<br />

Right<br />

Comments<br />

I-<strong>95</strong> Drainage Treatment provided in Basin 11 and swale<br />

Merrimack River<br />

Discharge contains a mix of existing and proposed<br />

flows. Portion of flow includes treatment provided in<br />

BMP-1, and treatment provided in Deep Sump CB's.<br />

Outfall will be removed<br />

Amesbury<br />

1<br />

Proposed 12" Outfall<br />

from Inf Basin 2<br />

ST 11+25 Left Wetland E Treatment provided in Basin<br />

2 Existing 12" Outfall ST 11 Left Wetland E Outfall will be removed<br />

3 Existing 12" Outfall ST 12+50 Left Wetland E<br />

Existing outfall to remain, BVW located immediately<br />

adjacent to discharge. Deep Sump CB incorporated<br />

upgradient<br />

4 Proposed 18" Outfall ST 13 Right Wetland I<br />

Discharge contains a mix of existing and proposed<br />

flows. Portion of flow includes treatment provided in<br />

median swale, Inf Trench 2B and Deep Sump CB's.<br />

5 Existing 12" Outfall ST 13 Right Wetland I Outfall will be removed<br />

6 Existing 12" Outfall ST 15 Right Wetland I Outfall will be removed<br />

7 Existing 12" Outfall<br />

ST 18+25<br />

Right<br />

Wetland I<br />

Outfall will be removed<br />

8 Existing 12" Outfall ST 18+25 Left Wetland F<br />

Existing outfall to remain, Deep Sump CB<br />

incorporated upgradient.<br />

9 Existing Conc Swale ST 23+50 Left Wetland G<br />

Existing outfall to remain, treatment provided in<br />

Swale, discharge adjacent to BVW<br />

10 Existing 18" Outfall<br />

ST24+50<br />

Right<br />

Wetland G Treatment provided in Swale<br />

11 Existing 12" Outfall ST 26 Left Wetland G<br />

Existing outfall to remain, BVW located immediately<br />

adjacent to discharge.<br />

12 Existing 12" Outfall ST 29+50 Left Wetland G<br />

Existing outfall to remain, BVW located immediately<br />

adjacent to discharge.<br />

13 Existing 12" Outfall ST 30+50 Left Wetland G<br />

Existing outfall to remain, BVW located immediately<br />

adjacent to discharge.<br />

14 Existing 12" Outfall ST 31+25 Left Wetland G<br />

Existing outfall to remain, BVW located immediately<br />

adjacent to discharge.<br />

15 Existing Conc Swale ST 27 Right Wetland H Outfall will be removed<br />

16 Proposed 36" Outfall ST 27 Right Wetland H<br />

17 Existing 12" Outfall<br />

18 Existing 12" Outfall<br />

19 Proposed 12" Outfall<br />

ST 29+50<br />

Right<br />

ST 32+75<br />

Right<br />

ST 32+50<br />

Right<br />

Wetland H<br />

Wetland H<br />

Wetland H<br />

Discharge contains a mix of existing and proposed<br />

flows. Treatment provided in BMP 3, treatment<br />

provided in Deep Sump CB's<br />

Existing drainage pattern to remain, BVW<br />

immediately adjacent to roadway<br />

Outfall will be abandoned<br />

Treatment provided in deep sump CB's<br />

2-18

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