A00862-610535.pdf

Massachusetts Department Of Transportation Highway Division Proposal No. 610535-134928

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DOCUMENT A00862

WORCESTER DIVISION OF PLANNING &

REGULATORY SERVICES COMMENTS ON THE

NOTICE OF INTENT

Massachusetts Department Of Transportation Highway Division

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THIS PAGE INTENTIONALLY LEFT BLANK

March 23rd, 2026

Andrea Kendall LEC Environmental Consultants, Inc.

100 Grove Street, Suite 310 Worcester, MA 01605

DPRS Staff Comments – Pleasant Street Right-of-Way (CC-2026-011 & DEP File #: TBD)

Ms. Kendall, Staff from the Division of Planning & Regulatory Services (DPRS) have reviewed the Notice of Intent filing referenced above and offer the following comments. These comments are intended to identify items the Conservation Commission will likely want addressed prior to the upcoming meeting, with the goal of streamlining the public hearing process.

1. Add a plan detail or clarifying note to specify the measures proposed for: “Erosion Control

(TYP)”.

2. The proposed work includes modification to an area that discharges to Tatnuck Brook, a Cold- Water Fishery. The Stormwater Report and Checklist should be updated to reflect the applicability of Standard 6 and detail compliance to the extent applicable.

3. A plan detail for inlet protections for catch basins within the limit of work should be added to the plans.

Any questions or follow-up regarding these comments may be directed to the DPRS staff liaisons to the Conservation Commission:

Eric Flint, CFM Mattie VandenBoom Conservation Agent Assistant Conservation Agent P: 508-799-1400 ext. 31441 P: 508-799-1400 ext. 31435 E: FlintE@worcesterma.gov E: VandenBoomM@worcesterma.gov

Proposal No. 610535-134928

A00862 - 3 mailto:FlintE@worcesterma.gov mailto:VandenBoomM@worcesterma.gov

Larner, Erica N. (DOT)

From: CERO_NOI@MassMail.state.ma.us Sent: Monday, March 23, 2026 3:18 PM To: Larner, Erica N. (DOT); Rebula, Thomas (DEP); Kendall, Andrea (EXT) Cc: CERO_NOI (DEP); planning@worcesterma.gov; flinte; vandenboomm@worcesterma.gov;

CERO_NOI (DEP)

Subject: MassDEP NOI File Number

COMMONWEALTH OF MASSACHUSETTS

EXECUTIVE OFFICE OF ENERGY & ENVIRONMENTAL AFFAIRS

DEPARTMENT OF ENVIRONMENTAL PROTECTION

CENTRAL REGIONAL OFFICE

8 NEW BOND STREET, WORCESTER, MA 01606 508-792-7650

Date: 03/23/2026 Municipality WORCESTER

RE: NOTIFICATION OF WETLANDS PROTECTION ACT FILE NUMBER

The Department of Environmental Protection has received a Notice of Intent filed in accordance with the Wetlands Protection Act (M.G.L. c. 131, §40):

Applicant

MASSACHUSETTS DOT-

HIGHWAY DIVISION

Address

10 PARK PLAZA, ROOM

7360,BOSTON MA 02116

Locus

PLEASANT STREET (ROUTE

122) , WORCESTER MA 01602

Owner Address

This project has been assigned the following file # : CE 349-1445

ISSUANCE OF A FILE NUMBER INDICATES ONLY COMPLETENESS OF SUBMITTAL, NOT APPROVAL

OF APPLICATION

Although a file # is being issued, please note the following:

No Comment

Regards, for MassDEP, (508)-767-2721 Thomas.Rebula@Mass.gov

To help protect your privacy, Micro so ft Office prevented auto matic download of this pictu re from the In ternet.

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Technical Memorandum

Jacobs 1

Background:

In February 2026, MassDOT filed a Notice of Intent (CC-2026-011 & DEP File No. 349-1445) with the

Worcester Conservation Commission (the Commission) to construct improvements along Route 122

(Pleasant) Street to enhance safety and mobility for all modes of transportation. The project will improve the safety of Pleasant Street by restriping the roadway to provide buffered bicycle lanes in each direction, constructing approximately 4,075 feet of new sidewalk, and installing new rectangular rapid flashing beacons at several crosswalk locations. The project will not widen Pleasant Street, and the existing curbs will remain in their current location. The overall stormwater catchment remains the same in both pre- and post-conditions, although there will be a 4.18% increase in impervious cover. Existing flow patterns and stormwater drainage networks have been maintained. The project proposes minor improvements to the existing stormwater infrastructure within the project limits including deep sump catch basins at several street intersections. It has been determined that the Project will meet Standards 1, 5, 6, 7, 8, 9 and 10 of the Stormwater Standards (the Standards). Standards 2, 3 and 4 will be met to the maximum extent practicable (MEP).1

In 2014, the Commission issued an Order of Conditions under DEP File No. 349-1096 for the MassDOT

Worcester Pleasant Street Stormwater Retrofit Project (Proj # 607002) completed under their Impaired

Waterways Program. Specifically, the project included stormwater drainage and water quality improvements through the construction of three separate Stormwater Best Management Practices BMPs now referred to as Stormwater Control Measures (SCMs). The SCMs selected and installed are specifically recommended by the MA Stormwater Handbook for the protection of Cold-Water Fisheries. They included an infiltration basin with a forebay and four strategically placed leaching catch basins that are currently mitigating the effects of 80,000 square feet of impervious cover associated with Pleasant Street through promoting groundwater infiltration and stormwater water quality improvements. Specifically, the

Stormwater Retrofit Project is successfully reducing flow rates, is removing total suspended solids from the stormwater, and is promoting groundwater recharge – all of which result in a significant improvement to the water quality being ultimately discharged to Tatnuck Brook, a Cold-Water Fishery resource.

1 Stormwater Management Report – Pedestrian and Bicycle Improvements on Pleasant Street, prepared by Jacobs Engineering, dated

February 2026.

Pedestrian and Bicycle Improvements on Pleasant St (MassDOT Proj #6100535)

Standard 6 - Critical Area

Date: April 9, 2026 Jacobs

120 St James Avenue

5th Floor

Boston, MA 02116

Unites States

T +1.617.242.9222

F +1.617.242.9824

Jacobs.com

Project name: Pleasant Street (Route 122)

Project no: 610535

Attention: Worcester Conservation Commission

Client: MassDOT

Prepared by: Jacobs Engineering

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Technical Memorandum

Jacobs

Stormwater Standard 6 – Critical Area

MassDOT acknowledges DPRS’s March 23, 2026 comments that the proposed project includes modifications to an area that discharges to Tatnuck Brook, a Cold-Water Fishery. As applicable, the

Stormwater Report and Checklist were updated to reflect applicability and compliance with Stormwater

Standard 6 – Critical Area.

The Project Team has determined that a strong likelihood of a significant impact to Tatnuck Brook as a result of the current proposed project does not exist taking into account site specific factors such as the significant stormwater water quality improvements and thermal mitigation resulting from the 2014

Pleasant Street Stormwater Retrofit Project, the minimal increase in new impervious surface to areas that discharge to Tatnuck Brook (517 square feet), the fact that there are no new stormwater discharges to

Tatnuck Brook, and the addition of the proposed practicable structural SCMs described above.

Since the project does not pose a strong likelihood of a significant impact to Tatnuck Brook, the use of specific source control and pollution prevention measures determined to be suitable for managing discharges to such areas as described in the Massachusetts Stormwater Handbook and the MassDOT

Stormwater Design Guide 2023 Edition are not required. Nonetheless, MassDOT considered SCMs as part of the current project but concluded that additional measures were not practicable given that there is very minimal to no available area within the public right-of-way and that the 2014 Pleasant Street Stormwater

Retrofit Project provided stormwater water quality improvements from almost two acres of impervious road surface contributing to areas that discharge to Tatnuck Brook.

Stormwater Standard Compliance

The current project proposed meets the DEP Stormwater Regulations and Standards by complying with

Standards 1, 5, 6, 7, 8, 9 and 10. Standards 2, 3 and 4 will be met to the maximum extent practicable

(MEP).

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Stormwater Management Report

Pedestrian and Bicycle

Improvements on Pleasant Street

MassDOT Project #610535

Worcester, Massachusetts

PREPARED FOR

10 Park Plaza

Boston, MA 02116

PREPARED BY

Jacobs

120 St. James Avenue

Boston, MA 02116

February 2026

A00862 - 8 i Table of Contents

Table of Contents

1 Introduction

2 Project Summary

3 Existing Conditions

4 Proposed Conditions

5 Impaired Waters and TMDLs

6 Stormwater Management Standards

List of Figures

Figure No. Description Page

Figure 1 Locus Figure

Figure 2 Existing Drainage Patterns

Figure 3 FEMA Flood Insurance Rate Map

Figure 4 NRCS Soils Information

Figure 5 Proposed Drainage Patterns

List of Tables

Table No. Description Page

Table 1 Change in Impervious Surface Cover

Table 2 Existing Drainage Areas

Table 3 Wetland Resource Areas

Table 4 Impervious Area

Table 5 Proposed Drainage Areas

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Table 6 Impaired Waters and TMDL Information

Table 7 Rainfall Depths (in)

Table 8.1 2-Year Peak Discharge Rates (cfs)

Table 8.2 10-Year Peak Discharge Rates (cfs)

Table 8.3 100-Year Peak Discharge Rates (cfs)

Table 9 Required Recharge Volume for Project

Table 10 Provided Recharge Volumes at Each Analysis Point

Table 11 WQV at Each Analysis Point

Attachments

Appendix A: MassDEP Checklist for Stormwater Report

Appendix B: Soils and FEMA Information

Appendix C: Supporting Calculations

Appendix D: Hydraulic and Hydrologic Data

Appendix E: O&M Plan and LTPPP

Appendix F: Figures

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1 Introduction

Introduction This Stormwater Management Report has been prepared to demonstrate compliance with the Massachusetts Stormwater Management Standards (the Standards) in accordance with the Massachusetts Wetlands Protection Act Regulations (310 CMR 10.00) and Water Quality

Certification Regulations (314 CMR 9.00). Appendix A includes a completed Massachusetts

Department of Environmental Protection (MassDEP) Checklist for Stormwater Report, stamped by a Massachusetts registered professional engineer.

The Project follows the guidance presented in the MassDOT Stormwater Design Guide (SDG), and stormwater management systems are designed in accordance with the Standards.

The following MassDOT standard methodologies are being employed in this project:

• Use of the Macro Approach to meet requirements on a project-wide scale.

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2 Project Summary

Project Summary The Applicant, MassDOT, is proposing Project 610535 to construct improvements along Route

122 (Pleasant Street) in Worcester MA. The Project shall improve the safety of Route 122

(Pleasant Street) by restriping the roadway to provide buffered bicycle lanes in each direction, constructing approximately 4,075 feet (0.77 miles) of new sidewalk along the north side of the roadway, and installing new rectangular rapid flashing beacons at several crosswalk locations to meet MassDOT’s Healthy Transportation Policy. The roadway pavement shall be milled and overlaid with hot mix asphalt. At a number of side street intersections, side street alignments and curb radii shall be reset to promote safer crossings for pedestrians. The total project length is approximately 1.40 miles.

The Project is needed because of the lack of bicycle and pedestrian facilities through this corridor. Pleasant Street currently has two travel lanes in the westbound direction and one travel lane in the eastbound direction. Shoulder widths vary between 2 feet and 4 feet in width, which is unsuitable for safe bicycle use in consideration of the traffic volume. In addition, there is no sidewalk on the north side of Pleasant Street, the existing sidewalk does not meet current day ADA standard, and there are only four existing crosswalk locations.

The project will not widen Pleasant Street; the existing curbs will remain in their current location. The proposed restriping converts the westbound direction from 2 travel lanes to a single travel lane.

The proposed improvements shall result in an increase of impervious area, which is primarily attributed to the addition of sidewalks. The overall catchment area remains the same in the existing and proposed conditions. The overall areas and impervious surface cover areas are summarized in Table 1 below.

Table 1 Change in Impervious Surface Cover

Exist. Project

Catchment

Area (SF)

Exist.

Impervious

Surface

Cover (SF)

Prop. Project

Catchment

Area (SF)

Prop.

Impervious

Surface Cover

(SF)

Change in

Impervious

Cover (SF)

Percent

Change in

Impervious

Cover

393,548 372,527 393,548 388,093 +15,566 +4.18%

Existing flow patterns and stormwater drainage networks within the Project limits have been maintained. The project proposes minor improvements to the existing stormwater

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3 Project Summary infrastructure within the project limits, including the installation of deep sump (4-ft) catch basins at several side street intersections where the curbline is modified.

The following is a summary of key areas and how they are affected by the project:

• The project is not located within a Zone II or Interim Wellhead Protection Area.

• The proposed work does not impact the FEMA flood zone along Tatnuck Brook.

• No wetland resource areas are impacted by the project.

• There are no Land Uses with Higher Potential Pollutant Loads (LUHPPLs) within the project area.

The purpose of this report is to provide a summary of the Project’s stormwater management approach and compliance with the Massachusetts Stormwater Standards. This project is considered to be a redevelopment project. The proposed work is located in a previously developed area and will reconstruct existing sidewalks, construct new sidewalks, and mill and overlay the existing roadway pavement. No roadway widening is proposed.

It was determined that the Project will meet Standards 1, 5, 7, 8, 9, and 10 of the MA

Stormwater Standards. Standards 2, 3, 4, and 6 will be met to the maximum extent practicable

(MEP).

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4 Project Summary

Figure 1 Locus Figure

PROJECT

LOCATION

WORCESTER

PAXTON

A00862 - 14

5 Existing Conditions

Existing Conditions The existing total pavement width of Pleasant Street is approximately 44 feet. Shoulder widths vary between 2 and 4 feet in width. The roadway is curbed along both sides. A paved sidewalk is present along the south side of Pleasant Street.

Within the project limits, the existing Pleasant Street corridor is largely defined by residential development. The density of development is greater at the east end of the project. The topography is hilly, with a downhill slope from the west end of the project to the east end.

Stormwater runoff is collected via catch basins for the entire length of the project. The stormwater is conveyed through closed systems to various discharge points listed below.

There is one Stormwater Control Measure (SCM) located along the south side of Pleasant

Street.

12 Analysis Points (APs) have been identified for this project and are described below:

• AP-1: A 24-inch pipe connection to an existing 72-inch drainage pipe between

Bailey Road and Airport Drive (Sta. 32+00 RT+/-).

• AP-2: A 12-inch pipe outlet at a headwall adjacent to a 72-inch pipe outlet at a wetland resource area on the south side of Pleasant Street (Sta. 36+80 RT+/-).

• AP-3: A 12-inch pipe outlet in a headwall to the wetland resource area on the south side of Pleasant Street (Sta. 38+50 RT+/-).

• AP-4: A 12-inch pipe outlet in a headwall to the wetland resource area on the south side of Pleasant Street (Sta. 42+40 RT+/-).

• AP-5: A 24-inch pipe connection to an existing off-site storm drainage system in a drainage easement (Sta. 52+55 RT+/-).

• AP-6: A 12-inch pipe connection to an existing off-site storm drainage system on the north side of Pleasant Street (Sta. 54+75 LT+/-).

• AP-7: A 24-inch pipe connection to an existing off-site storm drainage system on the north side of Pleasant Street (Sta. 59+60 LT+/-).

• AP-8: An 18-inch pipe outlet into an existing SCM on the south side of Pleasant

Street (Sta. 64+50 RT+/-).

• AP-9: An 18-inch pipe outlet in a headwall near a wetland resource area on the north side of Pleasant Street (Sta. 69+70 LT+/-).

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6 Existing Conditions

• AP-10: A 12-inch pipe connection to an existing off-site storm drainage system on the north side of Pleasant Street (Sta. 72+75 LT+/-).

• AP-11: A 12-inch pipe connection to an existing off-site storm drainage system on the south side of Pleasant Street near Tatnuck Brook (Sta. 80+50 RT+/-).

Table 2 presents the existing drainage areas and their characteristics. Areas were developed using AutoCAD and are included in Appendix C. Appendix F shows existing drainage patterns and drainage area delineations contributing to each analysis point.

Table 2 Existing Drainage Areas

Analysis Point Drainage Area*

Area (acres) Curve Number

AP-1 1S 2.889 97

AP-2 2S 0.253 97

AP-3 3S 0.513 96

AP-4 4S 0.473 95

AP-5 5S 1.332 95

AP-6 6S 0.344 95

AP-7 7S 0.389 93

AP-8 8S 0.807 94

AP-9 9S 0.649 98

AP-10 10S 0.353 98

AP-11 11S 1.033 98

TOTAL= 9.035

*Label assigned for HydroCAD modeling

Key features in and around the project area include:

• The project is not located within a Zone II or Interim Wellhead Protection Area.

• The proposed work does not impact the FEMA flood zone along Tatnuck Brook.

• No wetland resource areas are impacted by the project.

• There are no Land Uses with Higher Potential Pollutant Loads (LUHPPLs) within the project area.

According to the most recently issued Flood Insurance Rate Maps, Map Nos. 25027C0595F and 25027C0613E, produced by the Federal Emergency Management Agency (FEMA), a portion of the project area is located within the floodplain along Tatnuck Brook. The proposed work within the floodplain includes reconstructing existing sidewalks and driveways, as well as roadway pavement milling and overlay. The activities will not alter the existing ground elevations nor require placement of fill materials. No impact to the floodplain is anticipated.

According to the Natural Resources Conservation Service soil survey for Worcester County, approximately 46.1% of the project area is Paxton fine sandy loam with a hydrologic soil group

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7 Existing Conditions

(HSG) rating of C. The other soil types found within the project area include Woodbridge fine sandy loam (HSG C/D), Hinckley-Urban land complex (HSG A), and Urban land. Appendix B provides detailed soils information, including the NRCS soil survey data for the project area.

One unnamed intermittent stream was delineated in several different locations within the project area. There is one perennial stream, Tatnuck Brook. Wetland resource areas are listed in Table 3.

Table 3 Wetland Resource Areas

Wetland Resource Area

Wetland Type Description

Intermittent Stream A, B, D

Intermittent Stream

An intermittent stream crosses under Pleasant Street in culverts in several locations and flows through a closed pipe drainage system in certain segments.

Wetland 4 BVW Wetland 4 was delineated in the wooded area on the north side of Pleasant Street between Mower Street and Pleasant Street.

Perennial Stream G Perennial Stream

Perennial Stream G (Tatnuck Brook) was delineated at the eastern end of the project where Pleasant Street cross over Tatnuck Brook.

Figure 2 Existing Drainage Patterns

See Appendix F.

Figure 3 FEMA Flood Insurance Rate Map

See Appendix B.

Figure 4 NRCS Soils Information

See Appendix B.

A00862 - 17

8 Proposed Conditions

Proposed Conditions The project has been designed to comply with the requirements for a “Redevelopment

Project”.

The proposed work includes:

• Milling and paving the existing roadway surface.

• Construction of approximately 4,075 feet (0.77 miles) of new sidewalk.

• Reconstruction of approximately 6,760 feet (1.28 miles) of existing sidewalk.

• Installation of new pavement markings and signage.

The proposed drainage work for this project includes the installation of three new, deep sump catch basins.

Table 4 provides existing and proposed impervious areas for the project.

Table 4 Impervious Area

Condition Impervious Area (ac)

Existing 8.552

Proposed 8.909

Net +0.357

The Project proposes to retain all existing stormwater outlet locations. No new outlets are proposed. The analysis points for the proposed conditions are the same as those identified for the existing conditions and are described in Section 3 of this report.

The opportunities to construct additional SCMs or incorporate Low Impact

Development (LID) techniques are extremely limited, primarily due to the existing topography and limited right-of-way width. There are also numerous locations with underground and/or overhead utilities along the edges of the roadway that preclude

SCMs and LID techniques. Stormwater Alternatives Analysis Plans, which show the site constraints and opportunities for SCMs and LID techniques, are included in Appendix

F.

A00862 - 18

9 Proposed Conditions

HydroCAD models for the existing and proposed conditions have been provided in

Appendix D. Plans depicting catchment areas within the Project limits are included in

Appendix F.

Efforts have been made during the design development process to limit the footprint of disturbance. The intent is to preserve as many of the existing trees and natural vegetation as possible. For much of the project, the proposed limit of work has been maintained in close proximity to the back of sidewalk and edge of roadway.

The proposed project is not located within a Zone II or Interim Wellhead Protection Area, and there are no LUHPPLs located within the project limits. The required Water Quality

Volume (WQV) is 1/2-inch over the impervious area.

The project does not impact any wetland resource areas, but does require work within

BVW 100 ft buffer zone and 200 ft Riverfront areas.

Table 5 presents the proposed drainage areas and their characteristics. Areas were developed using AutoCAD and are included in Appendix C. Figures in Appendix F show proposed drainage patterns and drainage area delineations contributing to each analysis point.

Figure 5 Proposed Drainage Patterns

See Appendix F.

Table 5 Proposed Drainage Areas

Analysis Point Drainage Area*

Area (acres) Curve Number

AP-1 1S 2.889 97

AP-2 2S 0.253 96

AP-3 3S 0.513 97

AP-4 4S 0.473 98

AP-5 5S 1.332 98

AP-6 6S 0.344 98

AP-7 7S 0.389 98

AP-8 8S 0.807 98

AP-9 9S 0.649 98

AP-10 10S 0.353 98

AP-11 11S 1.033 98

TOTAL= 9.035

*Label assigned for HydroCAD modeling

A00862 - 19

10 Impaired Waters and TMDLs

Impaired Waters and TMDLs As described under the Proposed Conditions section, a portion of the Project discharges to

Tatnuck Brook, which is impaired based on the MassDEP Year 2022 Integrated List of Waters, also known as the 303(d) list.

Table 6 lists the 303(d) category and impairments listed in MassDEP Year 2022 Integrated List of Waters. MassDOT is expecting to receive a Transportation Separate Storm Sewer System

(TS4) Permit from EPA, which will require that pollutant reductions presented in the TMDL be met on the watershed scale. As a result, the TMDL reductions do not need to be met by

MassDOT on a project-by-project basis, but rather, MassDOT strives to make incremental progress towards achieving the required TMDL pollutant reductions with each project.

Table 6 Impaired Waters and TMDL Information

Water Body 303(d) Category 303(d) Impairments

Tatnuck Brook

(MA51-15)

5 Fanwort*

Flow Regime Modification*

Benthic Macroinvertabrates

Escherichia Coli (E. Coli)

Sedimentation/Siltation

*TMDL not required (Non-pollutant)

TMDLs for the Tatnuck Brook are listed in the Massachusetts Department of Environmental

Protection December 2024 Final Massachusetts Statewide Total Maximum Daily Load for

Pathogen-Impaired Waterbodies, Appendix J: Blackstone River Basin.

A00862 - 20

11 Stormwater Management Standards

Stormwater Management Standards This Project is a Redevelopment Project. The project is located in a previously developed area and will reconstruct existing sidewalks, construct new sidewalks, and mill and overlay the existing roadway pavement. No roadway widening is proposed. Proposed drainage work includes three new catch basins with a 4-foot-deep sump for improved water quality.

The following Stormwater Management Standards are met: Standards 1, 5, 7, 8, 9, and 10.

Standards 2, 3, 4, and 6 are met only to the maximum extent practicable.

Standard 1: No New Untreated Discharges

No new stormwater conveyances may discharge untreated stormwater directly to or cause erosion in wetlands or waters of the Commonwealth.

No new stormwater outfalls are proposed for the Project. The Project does not propose to construct any new untreated stormwater conveyances or discharges that may cause erosion in wetlands or waters of the Commonwealth. The Project is a Redevelopment project, and consists of milling and hot mix asphalt overlay of the pavement surface, reconstructing existing sidewalks, and constructing new sidewalks to eliminate gaps in the pedestrian network.

Stormwater runoff within the project limits is currently collected via catch basins and closed drainage systems. All of the existing stormwater outlets are located beyond the project limits and will not be modified as part of this project.

A00862 - 21

12 Stormwater Management Standards

Standard 2: Peak Rate Attenuation

Stormwater management systems shall be designed so that post-development peak discharge rates do not exceed pre-development peak discharge rates. This Standard may be waived for discharges to land subject to coastal storm flowage as defined in 310 CMR 10.04.

As a Redevelopment Project, the project is required to meet Standard 2 only to the maximum extent practicable. For this project, the post-development peak discharge rates are slightly higher than the pre-development peak discharge rates due to the construction of new sidewalk.

HydroCAD modeling software was used to model the existing and proposed conditions for the 2-year, 10-year, and 100-year storm events. The outputs from the HydroCAD analyses are included in Appendix D.

Rainfall depths for the 2-year, 10-year, and 100-year 24-hour storm events are based on rainfall distributions from NOAA Atlas 14 and are shown in Table 7, below.

Table 7 Rainfall Depths (in)

Design Storm Event Rainfall Depth (in)

2-year 3.13

10-year 4.84

100-year 7.56

Tables 8.1, 8.2, and 8.3 provide a summary of peak flow rates for each design point under existing and proposed conditions.

Table 8.1 2-Year Peak Discharge Rates (cfs)

Analysis Point

Existing Peak Discharge (cfs)

Proposed Peak Discharge (cfs)

Net Change Peak Discharge

(cfs)

AP-1 7.97 7.97 0.00

AP-2 0.75 0.74 -0.01

AP-3 1.49 1.52 +0.03

AP-4 1.35 1.42 +0.07

AP-5 3.88 4.09 +0.21

AP-6 1.00 1.06 +0.06

AP-7 1.05 1.17 +0.12

AP-8 2.23 2.42 +0.19

AP-9 1.95 1.95 0.00

AP-10 1.08 1.08 0.00

AP-11 3.06 3.06 0.00

Project Total +0.67

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13 Stormwater Management Standards

Table 8.2 10-Year Peak Discharge Rates (cfs)

Analysis Point

Existing Peak Discharge (cfs)

Proposed Peak Discharge (cfs)

Net Change Peak Discharge

(cfs)

AP-1 12.51 12.51 0.00

AP-2 1.18 1.17 -0.01

AP-3 2.36 2.39 +0.03

AP-4 2.16 2.22 +0.06

AP-5 6.21 6.37 +0.16

AP-6 1.60 1.64 +0.04

AP-7 1.73 1.82 +0.09

AP-8 3.62 3.76 +0.14

AP-9 3.04 3.04 0.00

AP-10 1.69 1.69 0.00

AP-11 4.77 4.77 0.00

Project Total +0.51

Table 8.3 100-Year Peak Discharge Rates (cfs)

Analysis Point

Existing Peak Discharge (cfs)

Proposed Peak Discharge (cfs)

Net Change Peak Discharge

(cfs)

AP-1 19.68 19.68 0.00

AP-2 1.86 1.85 -0.01

AP-3 3.74 3.75 +0.01

AP-4 3.43 3.47 +0.04

AP-5 9.86 9.98 +0.12

AP-6 2.55 2.58 +0.03

AP-7 2.78 2.86 +0.08

AP-8 5.79 5.90 +0.11

AP-9 4.76 4.76 0.00

AP-10 2.64 2.64 0.00

AP-11 7.47 7.47 0.00

Project Total +0.38

For this project, the post-development peak discharge rates are higher than existing at all of the analysis points. The minor increases can be attributed to the addition of new sidewalks.

The scope of work for this project does not include modifying the existing stormwater systems with the exception of several new deep sump catch basins as mentioned previously.

The opportunities to construct SCMs or incorporate Low Impact Development (LID) techniques to attenuate peak discharge rates within the project area are extremely limited, primarily due to the existing topography, limited right-of-way width, roadside development, and presence

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14 Stormwater Management Standards of underground and overhead utilities. Stormwater Alternatives Analysis Plans, which show the project site constraints for SCMs and LID techniques, are included in Appendix F.

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15 Stormwater Management Standards

Standard 3: Recharge

Loss of annual recharge to groundwater shall be eliminated or minimized through the use of infiltration measures, including environmentally sensitive site design, low impact development techniques, stormwater best management practices, and good operation and maintenance. At a minimum, the annual recharge from the post-development site shall approximate the annual recharge from pre-development conditions based on soil type. This Standard is met when the stormwater management system is designed to infiltrate the required recharge volume as determined in accordance with the Massachusetts Stormwater Handbook.

As a Redevelopment Project, the project is required to meet Standard 3 only to the maximum extent practicable. For this project, the required recharge volume is greater than the provided recharge volume. Table 9 provides the required recharge volume for the Project.

Table 9 Required Recharge Volume for Project

HSG A HSG B HSG C HSG D Total

Existing Impervious (sq. ft.) 135,444 0 237,083 0 372,527

Proposed Impervious (sq. ft.) 145,732 0 242,361 0 372,527

New Impervious Area (sq. ft.) 10,288 0 5,278 0 15,566

Target depth, F (in) 0.60 0.35 0.25 0.10 -

Required Recharge Volume, ReV (cf)

514 0 110 0 624

ReV = F (ft) x Impervious Area (sf)

The Macro Approach is being used for compliance with this standard due to constraints at the project site. The required recharge volume for this project is 624 cubic feet.

Table 10 shows the recharge volumes required and provided for each Analysis Point.

Table 10 Provided Recharge Volumes at Each Analysis Point

Analysis Point SCM

New Impervious Area

(SF)

Required Recharge ReV Volume (CF)

*Provided Recharge

Volume (CF)

AP-1 - +3,509 73 0

AP-2 - -429 -9 0

AP-3 - +1,502 31 0

AP-4 - +1,333 67 0

AP-5 - +3,468 173 0

AP-6 - +984 49 0

AP-7 - +1,670 84 0

AP-8 - +2,833 142 0

AP-9 - +117 2 0

AP-10 - +62 1 0

AP-11 - +517 11 0

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16 Stormwater Management Standards

Analysis Point SCM

New Impervious Area

(SF)

Required Recharge ReV Volume (CF)

*Provided Recharge

Volume (CF)

Project Total

+15,566 624 0

The project will not meet the required recharge volume. The scope of work for this project does not include modifying the existing stormwater systems with the exception of three new catch basins as mentioned previously.

The opportunities to construct SCMs or incorporate Low Impact Development (LID) techniques to recharge groundwater within the project area are extremely limited, primarily due to the existing topography, limited right-of-way width, roadside development, and presence of underground and overhead utilities. Stormwater Alternatives Analysis Plans, which show the site constraints and opportunities for SCMs and LID techniques, are included in Appendix F.

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17 Stormwater Management Standards

Standard 4: Water Quality Treatment

Stormwater management systems shall be designed to remove 80% of the average annual post-construction load of Total Suspended Solids (TSS). This Standard is met when:

› Suitable practices for source control and pollution prevention are identified in a long-term pollution prevention plan, and thereafter are implemented and maintained.

› Structural stormwater best management practices are sized to capture the required water quality volume determined in accordance with the Massachusetts Stormwater Handbook.

› Pretreatment is provided in accordance with the Massachusetts Stormwater Handbook.

As a Redevelopment Project, the project is required to meet the pretreatment and structural stormwater best management practice requirements of Standard 4 to the maximum extent practicable.

The three new catch basins shall have a deep (4’) sump.

No part of the project area is located within a Zone II or Interim Wellhead Protection Area.

There are no Land Uses with Higher Potential Pollutant Loads (LUHPPLs) in or near the project area. The water quality volume shall defined as 0.5 inches of runoff from impervious areas with no LUHPPLs. Appendix C contains water quality volume calculations.

Table 11 provides the water quality volume for each analysis point.

Table 11 WQV at Each Analysis Point

Analysis

Point

SCM

New

Impervious

Area (sf)

Pre-treatment

WQV

Required

(cf)

WQV

Provided

(cf)

Meets

Total

WQV

Meets

Required WQV for New IA

AP-1 - +3,509 - 146 0 No No

AP-2 - -429 - -18 0 No No

AP-3 - +1,502 - 63 0 No No

AP-4 - +1,333 - 56 0 No No

AP-5 - +3,468 - 145 0 No No

AP-6 - +984 - 41 0 No No

AP-7 - +1,670 - 70 0 No No

AP-8 - +2,833 - 118 0 No No

AP-9 - +117 - 5 0 No No

AP-10 - +62 - 3 0 No No

AP-11 - +517 - 22 0 No No

Project Total

+15,566 651 0 No No

The goal of 80% TSS removal for the stormwater systems will not be met. The scope of work for this project does not include modifying the existing stormwater systems with the exception of the new catch basins noted previously.

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18 Stormwater Management Standards

This project does not propose to construct any new SCMs. The scope of the project does not alter the existing curblines along Pleasant Street, so the existing catch basins will be retained.

There is an existing SCM that was constructed circa 2018. The exact function of the SCM is not known, but it does appear to be some type of detention pond with sediment forebay. The proposed work will not modify or impact this existing SCM.

The opportunities to construct SCMs or incorporate Low Impact Development (LID) techniques to provide stormwater quality treatment within the project area are extremely limited, primarily due to the existing topography, limited right-of-way width, roadside development, and presence of underground and overhead utilities. Stormwater Alternatives Analysis Plans, which show the site constraints for SCMs and LID techniques, are included in Appendix F.

For MassDOT facilities, Long-Term Pollution Prevention Plans (LTPPPs) are implemented at a programmatic level through MassDOT’s highway operation and maintenance program by district. Appendix E includes the LTPPP for this project.

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19 Stormwater Management Standards

Standard 5: Land Uses with Higher Potential Pollutant Loads

For Land Uses with Higher Potential Pollutant Loads (LUHPPLs), source control and pollution prevention shall be implemented in accordance with the Massachusetts Stormwater Handbook to eliminate or reduce the discharge of stormwater runoff from such land uses to the maximum extent practicable. If through source control and/or pollution prevention all LHPPLs cannot be completely protected from exposure to rain, snow, snow melt, and stormwater runoff, the proponent shall use the specific structural stormwater BMPs determined by the Department to be suitable for such uses as provided in the Massachusetts Stormwater Handbook. Stormwater discharges from LUHPPLs shall also comply with the requirements of the Massachusetts Clean

Waters Act, M.G.L. c. 21, §§ 26-53 and the regulations promulgated thereunder at 314 CMR

3.00, 314 CMR 4.00 and 314 CMR 5.00.

There are no LUHPPLs located within the project limits.

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20 Stormwater Management Standards

Standard 6: Critical Areas

Stormwater discharges within the Zone II or Interim Wellhead Protection Area of a public water supply and stormwater discharges near or to any other critical area require the use of the specific source control and pollution prevention measures and the specific structural stormwater best management practices determined by the Department to be suitable for managing discharges to such areas as provided in the Massachusetts Stormwater Handbook. A discharge is near a critical area if there is a strong likelihood of a significant impact occurring to said area, taking into account site-specific factors. Stormwater discharges to Outstanding

Resource Waters and Special Resource Waters shall be removed and set back from the receiving water or wetland and receive the highest and best practical method of treatment. A

“stormwater discharge” as defined in 314 CMR 3.04(2)(a)1 or (b), to an Outstanding Resource

Water or Special Resource Water shall comply with 314 CMR 3.00 and 314 CMR 4.00.

Stormwater discharges to a Zone I or Zone A are prohibited unless essential to the operation of a public water supply.

The proposed project is not located within a Zone II or Interim Wellhead Protection Area.

Within the project area, Pleasant Street crosses over Tatnuck Brook, which is a Cold Water

Fishery (ID 5133050). There is an existing stormwater drainage system that discharges to the bank of the Tatnuck Brook in the southwest corner of the bridge. Tthis project is a redevelopment project and there are no proposed alterations to the existing stormwater systems or existing drainage patterns; therefore, there is no strong likelihood of a significant impact to this critical area. All other applicable Stormwater Standards are being met.

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21 Stormwater Management Standards

Standard 7: Redevelopment

A redevelopment project is required to meet the following Stormwater Management Standards only to the maximum extent practicable: Standard 2, Standard 3, and the pretreatment and structural best management practice requirements of Standards 4, 5, and 6. Existing stormwater discharges shall comply with Standard 1 only to the maximum extent practicable.

A redevelopment project shall also comply with all other requirements of the Stormwater

Management Standards and improve existing conditions.

The Project is a redevelopment project. In accordance with Massachusetts Stormwater

Handbook, a redevelopment project is defined to include maintenance and improvement of existing roadways, including widening less than a single lane, adding shoulders, correcting substandard intersections, improving existing drainage systems, and repaving. This project is located in a previously developed area and will reconstruct existing sidewalks, construct new sidewalks, and mill and overlay the existing roadway pavement. No roadway widening is proposed.

A redevelopment project is required to meet the following Stormwater Management

Standards only to the maximum extent practicable: Standard 2, Standard 3, and the pretreatment and structural best management practice requirements of Standards 4, 5, and 6.

A redevelopment project shall also comply with all other requirements of the Stormwater

Management Standards and improve existing conditions.

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22 Stormwater Management Standards

Standard 8: Erosion and Sediment Control

A plan to control construction related impacts, including erosion, sedimentation and other pollutant sources during construction and land disturbance activities (construction period erosion, sedimentation, and pollution prevention plan) shall be developed and implemented.

The Project complies with Standard 8. A Stormwater Pollution Prevention Plan in accordance with the regulations of the EPA Construction General Permit shall be prepared and submitted by the Contractor prior to construction activities. The implementation of erosion and sediment (E&S) controls during construction is considered a standard practice for all

MassDOT projects. E&S controls will be installed before any land disturbance begins for the

Project and will remain in place for the duration of the Project. The E&S controls for the

Project are shown on the project plans and include compost filter tubes, and filters at drain inlets. Erosion and sedimentation controls are proposed throughout the Project limits to prevent sediment and other suspended solids from migrating into the existing drainage infrastructure and downgradient wetland resource areas. The Contractor will be alerted that control of erosion and sedimentation is critically important in and around the areas indicated on the plans and adjacent to jurisdictional resource areas. The Contractor will implement the erosion and sedimentation controls as indicated on the plans. The Contractor will also be alerted to the fact that field conditions may warrant additional protection measures to comply with the regulations. It is the intention that the contractor will replace erosion controls as needed or at the direction of permit issuing authorities, MassDOT or the Environmental

Monitor, but not less than twice a year.

Erosion controls shall consist of compost filter tubes and catch basin sedimentation collection sack. No hay bales shall be used at any time on this project. The erosion and sedimentation control measures will be constructed in accordance with the Massachusetts Erosion and

Sediment Control Guidelines for Urban and Suburban Areas, March 1997, and the U.S.D.A.

SCS’s Erosion and Sediment control in the Site Development, Massachusetts Conservation

Guide, September 1983.

Temporary erosion and sedimentation control measures shall be installed prior to the commencement of any site work, maintained during construction, and shall remain in place until the site work is completed, and ground cover is established (at least 75% uniform coverage by new seedlings). All erosion and sedimentation control measures shall be maintained in effective condition throughout the construction period. The contractor shall inspect the erosion controls daily and clean accumulated materials from behind them as necessary. All erosion and sedimentation control measures found to need repair or replacement shall be immediately corrected. Any sediment removed from control structures shall be disposed of in an appropriate manner. No equipment or material of any kind shall be stockpiled or deposited in any regulated area.

Stockpiled soil within jurisdictional areas shall be surrounded with siltation fences to prevent and control siltation and erosion. Stockpiles that will remain exposed for more than 30 days shall be stabilized with mulch or seeded for temporary vegetative cover. All disturbed areas that remain exposed or undisturbed for a period of fourteen days or longer shall be stabilized with mulch or seeded for temporary vegetative cover.

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23 Stormwater Management Standards

The Contractor shall inspect all portions of the site in anticipation of rainfall events to determine if site grading is sufficient to prevent erosion of slopes and/or the transportation of sediments to wetlands or watercourses within the project limits. All disturbed earth slopes shall be stabilized with permanent vegetative cover as soon as possible. There shall be no direct discharge from dewatering operations into any wetland, watercourse or drainage system unless allowed by regulatory permits.

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24 Stormwater Management Standards

Standard 9: Operation and Maintenance Plan

A long-term operation and maintenance plan shall be developed and implemented to ensure that stormwater management systems function as designed.

MassDOT O&M plans are implemented on a programmatic level by each MassDOT district.

Each MassDOT district office is responsible for providing operation and maintenance for the

MassDOT stormwater management systems within their respective jurisdictions. Appendix E includes the O&M Plan for this project.

Standard 10: Prohibition of Illicit Discharges

All illicit discharges to the stormwater management system are prohibited.

Illicit Discharge Statement

The project’s stormwater management system, as shown on the plans submitted with this report, have been designed in full compliance with Standard 10. The project area does not have any known illicit connections. Any illicit connections to the stormwater management system found in the project limit of work during construction will be removed and/or resolved through MassDOT’s Illicit Discharge Detention and Elimination (IDDE) Program. The Long-

Term Pollution Prevention Plan, provided in Appendix E, includes measures to prevent illicit discharges.

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Appendices

Appendix A: MassDEP Checklist for

Stormwater Report

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Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program

Checklist for Stormwater Report

A. Introduction Important: When filling out forms on the computer, use only the tab key to move your cursor - do not use the return key.

A Stormwater Report must be submitted with the Notice of Intent permit application to document compliance with the Stormwater Management Standards. The following checklist is NOT a substitute for the Stormwater Report (which should provide more substantive and detailed information) but is offered here as a tool to help the applicant organize their Stormwater Management documentation for their Report and for the reviewer to assess this information in a consistent format. As noted in the Checklist, the Stormwater Report must contain the engineering computations and supporting information set forth in Volume 3 of the Massachusetts Stormwater Handbook. The Stormwater Report must be prepared and certified by a Registered Professional Engineer (RPE) licensed in the Commonwealth.

The Stormwater Report must include:

The Stormwater Checklist completed and stamped by a Registered Professional Engineer (see page 2) that certifies that the Stormwater Report contains all required submittals.1 This Checklist is to be used as the cover for the completed Stormwater Report.

Applicant/Project Name Project Address Name of Firm and Registered Professional Engineer that prepared the Report Long-Term Pollution Prevention Plan required by Standards 4-6 Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan required by Standard 82 Operation and Maintenance Plan required by Standard 9

In addition to all plans and supporting information, the Stormwater Report must include a brief narrative describing stormwater management practices, including environmentally sensitive site design and LID techniques, along with a diagram depicting runoff through the proposed BMP treatment train. Plans are required to show existing and proposed conditions, identify all wetland resource areas, NRCS soil types, critical areas, Land Uses with Higher Potential Pollutant Loads (LUHPPL), and any areas on the site where infiltration rate is greater than 2.4 inches per hour. The Plans shall identify the drainage areas for both existing and proposed conditions at a scale that enables verification of supporting calculations.

As noted in the Checklist, the Stormwater Management Report shall document compliance with each of the Stormwater Management Standards as provided in the Massachusetts Stormwater Handbook. The soils evaluation and calculations shall be done using the methodologies set forth in Volume 3 of the Massachusetts Stormwater Handbook.

To ensure that the Stormwater Report is complete, applicants are required to fill in the Stormwater Report Checklist by checking the box to indicate that the specified information has been included in the Stormwater Report. If any of the information specified in the checklist has not been submitted, the applicant must provide an explanation. The completed Stormwater Report Checklist and Certification must be submitted with the Stormwater Report.

1 The Stormwater Report may also include the Illicit Discharge Compliance Statement required by Standard 10. If not included in the Stormwater Report, the Illicit Discharge Compliance Statement must be submitted prior to the discharge of stormwater runoff to the post-construction best management practices.

2 For some complex projects, it may not be possible to include the Construction Period Erosion and Sedimentation Control Plan in the Stormwater Report. In that event, the issuing authority has the discretion to issue an Order of Conditions that approves the project and includes a condition requiring the proponent to submit the Construction Period Erosion and Sedimentation Control Plan before commencing any land disturbance activity on the site.

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B. Stormwater Checklist and Certification The following checklist is intended to serve as a guide for applicants as to the elements that ordinarily need to be addressed in a complete Stormwater Report. The checklist is also intended to provide conservation commissions and other reviewing authorities with a summary of the components necessary for a comprehensive Stormwater Report that addresses the ten Stormwater Standards.

Note: Because stormwater requirements vary from project to project, it is possible that a complete Stormwater Report may not include…