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Notice of Intent (NOI)

for

Revere, Massachusetts Route 60 – Town Line Brook

Impaired Waters Remediation Project

Submitted To: City of Revere

Conservation Commission 281 Broadway

Revere, Massachusetts 02151

January 2015

Prepared For: Massachusetts Department of Transportation

10 Park Plaza Boston, Massachusetts 02116

Prepared By: Comprehensive Environmental Inc.

225 Cedar Hill Street Marlborough, Massachusetts 01752

ROUTE 60 TOWN LINE BROOK IMPAIRED WATERS REMEDIATION PROJECT - Revere, MA Notice of Intent

NOI Table of Contents

Part A: Transmittal Form – Notice of Intent Part B: NOI Wetland Fee Transmittal Form Part C: WPA Form 3 Part D: Notice of Intent Narrative: 1.0 Introduction ........................................................................................................................1

1.1 Project Description ...................................................................................................1 1.2 Project Goal .............................................................................................................2 1.3 Project Background & Existing Conditions .............................................................2 1.4 Site Soils ..................................................................................................................2 1.5 Resource Area Delineation ......................................................................................3

2.0 Description of Proposed Work .........................................................................................3

2.1 Protective Measures .................................................................................................4 3.0 Activities Subject to Regulation ........................................................................................4

3.1 Description of Resource Area Impacts ....................................................................4 3.2 Limited Project Status ..............................................................................................5

3.3 Project Alternatives ..................................................................................................5 3.4 Selected Alternative .................................................................................................7 4.0 Conclusion ..........................................................................................................................7 5.0 DEP Stormwater Standards & Report ............................................................................7 List of Figures Figure 1 – Project Locus Map ..................................................................................... End of Report Figure 2 – Resource Area Impacts .............................................................................. End of Report

Attachments

Appendix A - Project Site Photos Appendix B - Test Pit Logs Appendix C - Project Plans Appendix D - O&M Plan Appendix E - Natural Heritage & Endangered Species Program Priority Habitat Areas Appendix F - FIRM Map Appendix G - Stormwater Checklist Appendix H - Drainage Calculations


Part A

Transmittal Form – Notice of Intent

NOI Transmittal - Revere • rev. 1/07 Page 1 of 1

Enter your transmittal number X264171 Transmittal Number

Your unique Transmittal Number can be accessed online: http://mass.gov/dep/service/online/trasmfrm.shtml or call MassDEP’s InfoLine at 617-338-2255 or 800-462-0444 (from 508, 781, and 978 area codes). Massachusetts Department of Environmental Protection Transmittal Form for Permit Application and Payment

1. Please type or print. A separate Transmittal Form must be completed for each permit application. 2. Make your check payable to the Commonwealth of Massachusetts and mail it with a copy of this form to: DEP, P.O. Box 4062, Boston, MA 02211. 3. Three copies of this form will be needed.

Copy 1 - the original must accompany your permit application. Copy 2 must accompany your fee payment. Copy 3 should be retained for your records 4. Both fee-paying and exempt applicants must mail a copy of this transmittal form to:

MassDEP P.O. Box 4062 Boston, MA 02211

* Note: For BWSC Permits, enter the LSP.

A. Permit Information BRP WPA Form 3

1. Permit Code: 7 or 8 character code from permit instructions WPA Notice of Intent

2. Name of Permit Category

Water Quality Improvement Project 3. Type of Project or Activity

B. Applicant Information – Firm or Individual Massachusetts Department of Transportation - Highway Division

1. Name of Firm - Or, if party needing this approval is an individual enter name below:

2. Last Name of Individual

3. First Name of Individual

4. MI

10 Park Plaza, Room 4260 5. Street Address

Boston 6. City/Town

MA 7. State

02116-3973 8. Zip Code

(857) 368-8807 9. Telephone #

10. Ext. #

Susan McArthur 11. Contact Person

[email protected] 12. e-mail address (optional)

C. Facility, Site or Individual Requiring Approval Route 60 - Copeland Circle Rotary Infield

1. Name of Facility, Site Or Individual

Route 60 - Copeland Circle 2. Street Address

Revere 3. City/Town

MA 4. State

02151 5. Zip Code

6. Telephone #

7. Ext. #

N/A 8. DEP Facility Number (if Known)

N/A 9. Federal I.D. Number (if Known)

N/A 10. BWSC Tracking # (if Known)

D. Application Prepared by (if different from Section B)* Comprehensive Environmental, Inc.

1. Name of Firm Or Individual

225 Cedar Hill Street 2. Address

Marlborough 3. City/Town

MA 4. State

01752 5. Zip Code

508-281-5160 6. Telephone #

305 7. Ext. #

Matthew Lundsted, P.E. 8. Contact Person

N/A 9. LSP Number (BWSC Permits only)

E. Permit - Project Coordination

1. Is this project subject to MEPA review? yes no If yes, enter the project’s EOEA file number - assigned when an

Environmental Notification Form is submitted to the MEPA unit:

N/A EOEA File Number

F. Amount Due

DEP Use Only

Special Provisions: 1. Fee Exempt (city, town or municipal housing authority)(state agency if fee is $100 or less). There are no fee exemptions for BWSC permits, regardless of applicant status. 2. Hardship Request - payment extensions according to 310 CMR 4.04(3)(c). 3. Alternative Schedule Project (according to 310 CMR 4.05 and 4.10). 4. Homeowner (according to 310 CMR 4.02).

Permit No:

Rec’d Date:

Reviewer: Check Number

$500.00 Dollar Amount

Date


Part B

NOI Wetland Fee Transmittal Form

Wpaform3.doc • Wetland Fee Transmittal Form • rev. 2/21/08 Page 1 of 2

Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands

NOI Wetland Fee Transmittal Form Massachusetts Wetlands Protection Act M.G.L. c. 131, §40

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

A. Applicant Information

1. Applicant:

Susan a. First Name

McArthur b. Last Name

Massachusetts Department of Transportation - Highway Division c. Organization

10 Park Plaza, Room 4260 d. Mailing Address

Boston e. City/Town

MA f. State

02116-3973 g. Zip Code

(857) 368-8807 h. Phone Number

(857) 368-0609 i. Fax Number

[email protected] j. Email Address

2. Property Owner (if different):

a. First Name

b. Last Name

Massachusetts Department of Transportation c. Organization

10 Park Plaza d. Mailing Address

Boston e. City/Town

MA f. State

02116 g. Zip Code

h. Phone Number

i. Fax Number

j. Email Address

3. Project Location:

Route 60 - Copeland Circle a. Street Address

Revere b. City/Town

To calculate filing fees, refer to the category fee list and examples in the instructions for filling out WPA Form 3 (Notice of Intent).

B. Fees

The fee should be calculated using the following six-step process and worksheet. Please see Instructions before filling out worksheet. Step 1/Type of Activity: Describe each type of activity that will occur in wetland resource area and buffer zone. Step 2/Number of Activities: Identify the number of each type of activity. Step 3/Individual Activity Fee: Identify each activity fee from the six project categories listed in the instructions. Step 4/Subtotal Activity Fee: Multiply the number of activities (identified in Step 2) times the fee per category (identified in Step 3) to reach a subtotal fee amount. Note: If any of these activities are in a Riverfront Area in addition to another Resource Area or the Buffer Zone, the fee per activity should be multiplied by 1.5 and then added to the subtotal amount. Step 5/Total Project Fee: Determine the total project fee by adding the subtotal amounts from Step 4. Step 6/Fee Payments: To calculate the state share of the fee, divide the total fee in half and subtract $12.50. To calculate the city/town share of the fee, divide the total fee in half and add $12.50.

Wpaform3.doc • Wetland Fee Transmittal Form • rev. 2/21/08 Page 2 of 2


NOI Wetland Fee Transmittal Form Massachusetts Wetlands Protection Act M.G.L. c. 131, §40

B. Fees (continued)

Step 1/Type of Activity Step 2/Number of Activities

Step 3/Individual Activity Fee

Step 4/Subtotal Activity Fee

2e - Infiltration Basin BMP

1

$500

$500

Step 5/Total Project Fee: 500.00

Step 6/Fee Payments:

Total Project Fee:

$500.00 a. Total Fee from Step 5

State share of filing Fee: $237.50 b. 1/2 Total Fee less $12.50

City/Town share of filling Fee: $262.50 c. 1/2 Total Fee plus $12.50

C. Submittal Requirements

a.) Complete pages 1 and 2 and send with a check or money order for the state share of the fee, payable to the Commonwealth of Massachusetts.

Department of Environmental Protection

Box 4062 Boston, MA 02211

b.) To the Conservation Commission: Send the Notice of Intent or Abbreviated Notice of Intent; a copy of

this form; and the city/town fee payment.

To MassDEP Regional Office (see Instructions): Send a copy of the Notice of Intent or Abbreviated Notice of Intent; a copy of this form; and a copy of the state fee payment. (E-filers of Notices of Intent may submit these electronically.)


Part C

WPA Form 3

wpaform3.doc • rev. 02/21/08

Page 1 of 8


WPA Form 3 – Notice of Intent Massachusetts Wetlands Protection Act M.G.L. c. 131, §40

Provided by MassDEP:

MassDEP File Number

Document Transaction Number

Revere City/Town

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

Note: Before completing this form consult your local Conservation Commission regarding any municipal bylaw or ordinance.

A. General Information

1. Project Location (Note: electronic filers will click on button to locate project site):

Route 60 - Copeland Circle a. Street Address

Revere b. City/Town

02151 c. Zip Code

Latitude and Longitude: 42.430143 d. Latitude

-71.018769 e. Longitude

f. Assessors Map/Plat Number

g. Parcel /Lot Number

2. Applicant:

Susan a. First Name

McArthur b. Last Name

Massachusetts Department of Transportation - Highway Division c. Organization

10 Park Plaza, Room 4260 d. Street Address

Boston e. City/Town

MA f. State

02116-3973 g. Zip Code

(857) 368-8807 h. Phone Number

(857) 368-0609 i. Fax Number

[email protected] j. Email Address

3. Property owner (required if different from applicant): Check if more than one owner

a. First Name

b. Last Name

Massachusetts Department of Transportation c. Organization

10 Park Plaza d. Street Address

Boston e. City/Town

MA f. State

02116 g. Zip Code

h. Phone Number

i. Fax Number

j. Email address

4. Representative (if any):

Matthew a. First Name

Lundsted b. Last Name

Comprehensive Environmental. Inc. c. Company

225 Cedar Hill Street d. Street Address

Marlborough e. City/Town

MA f. State

01752 g. Zip Code

508-281-5160 h. Phone Number

508-281-5136 i. Fax Number

[email protected] j. Email address

5. Total WPA Fee Paid (from NOI Wetland Fee Transmittal Form):

$500.00 a. Total Fee Paid

$237.50 b. State Fee Paid

$262.50 c. City/Town Fee Paid


Page 2 of 8




MassDEP File Number


Revere City/Town

A. General Information (continued)

6. General Project Description:

Installation of an infiltration basin to provide stormwater treatment to runoff from MassDOT roads contributing to Town Line Brook. Drainage infrastructure will be installed to rout stormwater runoff to the proposed infiltration basin. A forebay, basin and armored spillway will be installed to treat and infiltrate approx. 2 inches of runoff over the impervious area and safely pass larger sized storms.

7a. Project Type Checklist:

1. Single Family Home 2. Residential Subdivision

3. Limited Project Driveway Crossing 4. Commercial/Industrial

5. Dock/Pier 6. Utilities

7. Coastal Engineering Structure 8. Agriculture (e.g., cranberries, forestry)

9. Transportation 10. Other

7b. Is any portion of the proposed activity eligible to be treated as a limited project subject to 310 CMR 10.24 (coastal) or 310 CMR 10.53 (inland)?

1. Yes No If yes, describe which limited project applies to this project:

Proposed activities fall under limited projects described under 310 CMR 10.53(4)…projects which will improve the natural capacity of a resource area(s) to protect the interests identified…

8. Property recorded at the Registry of Deeds for:

Suffolk a. County

N/A (see project description) b. Certificate # (if registered land)

N/A (see project description) c. Book

N/A (see project description) d. Page Number

B. Buffer Zone & Resource Area Impacts (temporary & permanent)

1. Buffer Zone Only – Check if the project is located only in the Buffer Zone of a Bordering Vegetated Wetland, Inland Bank, or Coastal Resource Area.

2. Inland Resource Areas (see 310 CMR 10.54-10.58; if not applicable, go to Section B.3, Coastal Resource Areas).

Check all that apply below. Attach narrative and any supporting documentation describing how the project will meet all performance standards for each of the resource areas altered, including standards requiring consideration of alternative project design or location.

For all projects affecting other Resource Areas, please attach a narrative explaining how the resource area was delineated.

Resource Area Size of Proposed Alteration Proposed Replacement (if any)

a. Bank 1. linear feet

2. linear feet

b. Bordering Vegetated Wetland

1. square feet

2. square feet

c. Land Under Waterbodies and Waterways

1. square feet

2. square feet

3. cubic yards dredged


Page 3 of 8




MassDEP File Number


Revere City/Town

B. Buffer Zone & Resource Area Impacts (temporary & permanent) (cont’d)


d. Bordering Land Subject to Flooding

1. square feet

2. square feet

3. cubic feet of flood storage lost

4. cubic feet replaced

e. Isolated Land Subject to Flooding

1. square feet

2. cubic feet of flood storage lost

3. cubic feet replaced

f. Riverfront Area 1. Name of Waterway (if available)

2. Width of Riverfront Area (check one):

25 ft. - Designated Densely Developed Areas only

100 ft. - New agricultural projects only

200 ft. - All other projects

3. Total area of Riverfront Area on the site of the proposed project:

square feet

4. Proposed alteration of the Riverfront Area:

a. total square feet

b. square feet within 100 ft.

c. square feet between 100 ft. and 200 ft.

5. Has an alternatives analysis been done and is it attached to this NOI? Yes No

6. Was the lot where the activity is proposed created prior to August 1, 1996? Yes No

3. Coastal Resource Areas: (See 310 CMR 10.25-10.35)

Check all that apply below. Attach narrative and supporting documentation describing how the project will meet all performance standards for each of the resource areas altered, including standards requiring consideration of alternative project design or location.

Online Users: Include your document transaction number (provided on your receipt page) with all supplementary information you submit to the Department.


a. Designated Port Areas Indicate size under Land Under the Ocean, below

b. Land Under the Ocean 1. square feet


c. Barrier Beach Indicate size under Coastal Beaches and/or Coastal Dunes below

d. Coastal Beaches 1. square feet

2. cubic yards beach nourishment

e. Coastal Dunes

1. square feet

2. cubic yards dune nourishment


Page 4 of 8




MassDEP File Number


Revere City/Town

B. Buffer Zone & Resource Area Impacts (temporary & permanent) (cont’d)

Size of Proposed Alteration Proposed Replacement (if any)

f. Coastal Banks

1. linear feet

g. Rocky Intertidal Shores

1. square feet

h. Salt Marshes

1. square feet

2. sq ft restoration, rehab., creation

i. Land Under Salt Ponds

1. square feet


j. Land Containing Shellfish

1. square feet

k. Fish Runs Indicate size under Coastal Banks, inland Bank, Land Under the Ocean, and/or inland Land Under Waterbodies and Waterways, above


l. Land Subject to Coastal Storm Flowage

1. square feet

4. Restoration/Enhancement If the project is for the purpose of restoring or enhancing a wetland resource area in addition to the square footage that has been entered in Section B.2.b or B.3.h above, please enter the additional amount here. a. square feet of BVW

b. square feet of Salt Marsh

C. Other Applicable Standards and Requirements

Streamlined Massachusetts Endangered Species Act/Wetlands Protection Act Review

1. Is any portion of the proposed project located in Estimated Habitat of Rare Wildlife as indicated on the most recent Estimated Habitat Map of State-Listed Rare Wetland Wildlife published by the Natural Heritage and Endangered Species Program (NHESP)? To view habitat maps, see the Massachusetts Natural Heritage Atlas or go to http://www.mass.gov/dfwele/dfw/nhesp/nhregmap.htm.

a. Yes No If yes, include proof of mailing or hand delivery of NOI to:

Natural Heritage and Endangered Species Program Division of Fisheries and Wildlife Route 135, North Drive Westborough, MA 01581

b. Date of map

If yes, the project is also subject to Massachusetts Endangered Species Act (MESA) review (321 CMR 10.18). To qualify for a streamlined, 30-day, MESA/Wetlands Protection Act review, please complete Section C.1.C, and include requested materials with this Notice of Intent (NOI); OR complete Section C.1.d, if applicable. If MESA supplemental information is not included with the NOI, by completing Section 1 of this form, the NHESP will require a separate MESA filing which may take up to 90 days to review (unless noted exceptions in Section 2 apply, see below).


Page 5 of 8




MassDEP File Number


Revere City/Town

C. Other Applicable Standards and Requirements (cont’d)

1. c. Submit Supplemental Information for Endangered Species Review *

1. Percentage/acreage of property to be altered:

(a) within wetland Resource Area

percentage/acreage

(b) outside Resource Area

percentage/acreage

2. Assessor’s Map or right-of-way plan of site

3. Project plans for entire project site, including wetland resource areas and areas outside of wetlands jurisdiction, showing existing and proposed conditions, existing and proposed tree/vegetation clearing line, and clearly demarcated limits of work **

(a) Project description (including description of impacts outside of wetland resource area & buffer zone)

(b) Photographs representative of the site

(c) MESA filing fee (fee information available at: http://www.mass.gov/dfwele/dfw/nhesp/nhenvmesa.htm)

Make check payable to “Natural Heritage & Endangered Species Fund” and mail to NHESP at above address

Projects altering 10 or more acres of land, also submit:

(d) Vegetation cover type map of site

(e) Project plans showing Priority & Estimated Habitat boundaries

d. OR Check One of the Following

1. Project is exempt from MESA review. Attach applicant letter indicating which MESA exemption applies. (See 321 CMR 10.14, http://www.mass.gov/dfwele/dfw/nhesp/nhenvexemptions.htm; the NOI must still be sent to NHESP if the project is within estimated habitat pursuant to 310 CMR 10.37 and 10.59.)

2. Separate MESA review ongoing.

a. NHESP Tracking Number

b. Date submitted to NHESP

3. Separate MESA review completed.

Include copy of NHESP “no Take” determination or valid Conservation & Management Permit with approved plan.

* Some projects not in Estimated Habitat may be located in Priority Habitat, and require NHESP review (see www.nhesp.org regulatory review tab). Priority Habitat includes habitat for state- listed plants and strictly upland species not protected by the Wetlands Protection Act.

** MESA projects may not be segmented (321 CMR 10.16). The applicant must disclose full development plans even if such plans are not required as part of the Notice of Intent process.


Page 6 of 8




MassDEP File Number


Revere City/Town

C. Other Applicable Standards and Requirements (cont’d)

2. For coastal projects only, is any portion of the proposed project located below the mean high water line or in a fish run?

a. Not applicable – project is in inland resource area only

b. Yes No If yes, include proof of mailing or hand delivery of NOI to either:

South Shore - Cohasset to Rhode Island, and the Cape & Islands:

Division of Marine Fisheries - Southeast Marine Fisheries Station Attn: Environmental Reviewer 838 South Rodney French Blvd. New Bedford, MA 02744

North Shore - Hull to New Hampshire:

Division of Marine Fisheries - North Shore Office Attn: Environmental Reviewer 30 Emerson Avenue Gloucester, MA 01930

Also if yes, the project may require a Chapter 91 license. For coastal towns in the Northeast Region, please contact MassDEP’s Boston Office. For coastal towns in the Southeast Region, please contact MassDEP’s Southeast Regional Office.

Online Users: Include your document transaction number (provided on your receipt page) with all supplementary information you submit to the Department.

3. Is any portion of the proposed project within an Area of Critical Environmental Concern (ACEC)?

a. Yes No If yes, provide name of ACEC (see instructions to WPA Form 3 or MassDEP Website for ACEC locations). Note: electronic filers click on Website.

b. ACEC

4. Is any portion of the proposed project within an area designated as an Outstanding Resource Water (ORW) as designated in the Massachusetts Surface Water Quality Standards, 314 CMR 4.00?

a. Yes No

5. Is any portion of the site subject to a Wetlands Restriction Order under the Inland Wetlands Restriction Act (M.G.L. c. 131, § 40A) or the Coastal Wetlands Restriction Act (M.G.L. c. 130, § 105)?

a. Yes No

6. Is this project subject to provisions of the MassDEP Stormwater Management Standards?

a. Yes. Attach a copy of the Stormwater Report as required by the Stormwater Management Standards per 310 CMR 10.05(6)(k)-(q) and check if:

1. Applying for Low Impact Development (LID) site design credits (as described in Stormwater Management Handbook Vol. 2, Chapter 3)

2. A portion of the site constitutes redevelopment

3. Proprietary BMPs are included in the Stormwater Management System.

b. No. Check why the project is exempt:

1. Single-family house

2. Emergency road repair

3. Small Residential Subdivision (less than or equal to 4 single-family houses or less than or equal to 4 units in multi-family housing project) with no discharge to Critical Areas.


Page 7 of 8




MassDEP File Number


Revere City/Town

D. Additional Information

Applicants must include the following with this Notice of Intent (NOI). See instructions for details.

Online Users: Attach the document transaction number (provided on your receipt page) for any of the following information you submit to the Department.

1. USGS or other map of the area (along with a narrative description, if necessary) containing sufficient information for the Conservation Commission and the Department to locate the site. (Electronic filers may omit this item.)

2. Plans identifying the location of proposed activities (including activities proposed to serve as a Bordering Vegetated Wetland [BVW] replication area or other mitigating measure) relative to the boundaries of each affected resource area.

3. Identify the method for BVW and other resource area boundary delineations (MassDEP BVW Field Data Form(s), Determination of Applicability, Order of Resource Area Delineation, etc.), and attach documentation of the methodology.

4. List the titles and dates for all plans and other materials submitted with this NOI.

See attached Narrative for list. a. Plan Title

Comprehensive Environmental, Inc. b. Prepared By

Matthew Lundsted c. Signed and Stamped by

January 9, 2015 d. Final Revision Date

1" = 30' e. Scale

f. Additional Plan or Document Title

g. Date

5. If there is more than one property owner, please attach a list of these property owners not

listed on this form.

6. Attach proof of mailing for Natural Heritage and Endangered Species Program, if needed.

7. Attach proof of mailing for Massachusetts Division of Marine Fisheries, if needed.

8. Attach NOI Wetland Fee Transmittal Form

9. Attach Stormwater Report, if needed.

E. Fees

1. Fee Exempt: No filing fee shall be assessed for projects of any city, town, county, or district of the Commonwealth, federally recognized Indian tribe housing authority, municipal housing authority, or the Massachusetts Bay Transportation Authority.

Applicants must submit the following information (in addition to pages 1 and 2 of the NOI Wetland Fee Transmittal Form) to confirm fee payment:

020986 2. Municipal Check Number

January 20, 2015 3. Check date

020987 4. State Check Number

January 20, 2015 5. Check date

Comprehensive Environmental, Inc. 6. Payor name on check: First Name

7. Payor name on check: Last Name


Part D

Notice of Intent Narrative


Page 1 of 8

1.0 Introduction The intent of this project is to implement water quality improvements under the Massachusetts Department of Transportation’s (MassDOT’s) impaired water stormwater compliance program. Stormwater Best Management Practices (BMPs) will be installed within the watershed of an Unnamed Tributary, locally known as “Town Line Brook” (MA93-51) as part of MassDOT’s Impaired Waters Retrofit Initiative to improve water quality. This project is proposed to be included as part of MassDOT’s 5.0-mile Resurfacing Project (#607174) of Route 1 starting in Chelsea and extending northerly into Saugus. The resurfacing project will include the southbound on- and off-ramps to Route 60 from Route 1, and the western portion of Copeland Circle. The resurfacing portion of this project has previously received a Negative Determination of Applicability issued by the Revere Conservation Commission on November 5, 2014. This current permit application is solely for the installation of stormwater improvements to provide treatment to roadway runoff in the area of the Route 60 and Route 1 intersection. The installation of new drainage structures and BMPs will address impaired waters and mitigate the impact of impervious cover from the MassDOT roadway in this area. No roadway expansion or increase in impervious area is proposed as part of the proposed BMP construction, the project is exclusively to treat stormwater runoff prior to reaching Town Line Brook and ultimately Pines River. 1.1 Project Description The proposed project is an effective impervious cover (EIC) reduction project for stormwater runoff draining to Town Line Brook. Through this proposed project, the Massachusetts Department of Transportation (MassDOT) will implement an infiltration basin within a section of the large grassed infield of the Copeland Circle rotary in the City of Revere, Massachusetts. Town Line Brook is a tidal river that extends from Route 99 in Malden 1.6 miles east to its confluence with Pines River (MA93-15) at the Route 1 Bridge in Revere. The Town Line Brook watershed includes urban, industrial, and densely developed residential areas in the Cities of Malden, Everett, and Revere. Much of the watershed is drained through Municipal Separate Storm Sewer Systems (MS4s) which discharge directly into the Tributary. Town Line Brook is listed under Category 5, “Waters Requiring a TMDL”, on MassDEP’s final Massachusetts Year 2012 Integrated List of Waters (MassDEP, 2013). The Unnamed Tributary is impaired by the following causes: taste and odor, fecal coliform, alteration in stream-side or littoral vegetative cover, physical substrate habitat alterations, other flow regime alterations, debris/floatables/trash. Impairments for primary contact, secondary contact, and aesthetics are attributed to fecal coliform bacteria, trash and debris, and odor (MassDEP, 2007). The sources of these contaminants are presumed to be discharges from separate storm sewer systems, sanitary sewer overflows, urban runoff/storm sewers, and potentially illicit connections (MassDEP, 2007). The Unnamed Tributary is covered by the Final Pathogen TMDL for the North Coastal Watershed (MassDEP, 2012).


Page 2 of 8

1.2 Project Goal The goal of this project is to install the proposed infiltration basin to provide stormwater treatment and reduce effective impervious cover resulting in an improvement to water quality entering Town Line Brook, and ultimately Pines River. The target goal of the project is a reduction of 1.7 acres (81% of DOT directly contributing impervious cover) of effective impervious cover (EIC) on urban roadways owned by MassDOT within the watershed. Through the installation of the proposed infiltration basin and routing existing and proposed stormwater infrastructure to the proposed infiltration basin, direct impervious cover within the watershed and associated pollutant loads to Town Line Brook will be reduced. The infiltration basin will provide treatment for approximately 2” of runoff from the surrounding subcatchment area. 1.3 Project Background & Existing Conditions The watershed contributing to the Town Line Brook is approximately 2,730 acres and includes areas in Malden, Revere, Everett, and Melrose. MassDOT’s property that directly contributes stormwater runoff to the Unnamed Tributary is comprised of approximately 0.26 miles of Squire Road (Route 60) from the Route 1 rotary to the Malden and Revere city line. This road is a divided road with turning lanes into adjacent commercial properties and includes portions of the western side of the Copeland Circle rotary. The project will include the southbound on- and off-ramps to Route 60 from Route 1, and the western portion of Copeland Circle. Stormwater improvements through the installation of new drainage structures and BMPs will address impaired waters and mitigate the impact of impervious cover from the MassDOT roadway in this area. The existing stormwater runoff infrastructure does not currently have any BMPs in place to reduce impervious cover and pollutants associated stormwater runoff. The runoff is collected around the watershed and is discharged untreated into Town Line Brook. Photos documenting existing conditions are provided in Appendix A. 1.4 Site Soils The NRCS soil type along Route 60 (Squire Road) within the contributing watershed is listed as Urban Land. Urban land consists mostly of impervious areas such as buildings, roads, and parking lots. This soil type is typically not classified with a hydrologic soil group (HSG). At the intersection of Routes 1 & 60 (Copeland Circle) the NRCS soil type is listed as Udorthents. This soil type does not have a HSG classification; however it is generally listed as moderate to well-draining soils typically consisting of loamy soils used as fill.

CEI conducted exploratory test pits within the area to confirm soils and groundwater elevations. As part of the test pit coordination the locations were marked for Dig Safe, which lead to coordination with the Massachusetts Water Resources Authority (MWRA). An existing 24-inch water main encased in a 30-inch steel pipe owned by MWRA is located within Squire Road, following southeast along the rotary. MWRA granted permission to perform two of the three


Page 3 of 8

proposed test pit locations. The test pit proposed within the 14-foot wide grassed median between the east and west bound lanes was deemed too close to the MWRA water main. The soils at the two completed test pits were generally found to be sandy loam (HSG B) with the groundwater table approximately 5 feet below the existing ground surface.

CEI completed one test pit within the rotary infield area and one test pit within the nearby traffic island at the intersection of Route 60 and Copeland Circle on July 23, 2014. Test pits were completed within the open grassed areas of the infield and traffic island to approximate depths of 7 feet and 8 feet. Based on the July 23 test pit data and analysis, the exploration revealed the presence of moderate sandy loam soils indicative of HSG B soils that would have good to fair infiltration capabilities in this area. Additionally, the soils exploration revealed the presence of seasonally high groundwater seepage between 5 and 5.5 feet below the ground surface which would not limit infiltration basin grading and would maintain adequate clearance to groundwater. Test pit locations and logs are provided in Appendix B. 1.5 Resource Area Delineation On August 11, 2014, CEI identified resource areas located within Copeland Circle (rotary infield) as bordering vegetated wetlands (BVW) to a drainage ditch associated with the existing stormwater drainage outfall from the MassDOT roadway. These wetlands were identified and flagged within the westernmost section of the infield. 2.0 Description of Proposed Work The project will require installation of an infiltration basin within a portion of the large grassed island (a.k.a. the rotary infield) of Copeland Circle in the City of Revere, Massachusetts, which would be located completely within MassDOT’s Right-of-Way. The infiltration basin has been sized to handle approximately 2-inches of stormwater runoff from the impervious area of the proposed basin subwatershed. The controlling factor for the design of this infiltration basin was the depth of the drainage piping network contributing to the basin. Based on the test pit (TP-2), the ultimate infiltration basin depth was estimated which determined the distance the contributing drainage network could extend at a 0.5% slope while maintaining minimal pipe cover. The basin has been sized to store 2-inches of stormwater runoff from the impervious area to receive the greatest reduction credit. A volume equivalent to 2 inches over 1.06 acres of impervious area (approximately 7,500 cubic feet) will be captured and treated by the BMPs. The existing drainage system within the subwatershed will be modified to divert flows into the infiltration basin. An overflow weir will be utilized to discharge treated flows into the rotary infield which ultimately will discharge into the Pines River. The total EIC acreage reduction from the proposed infiltration basin BMP shown on Sheet C-1 is approximately 1.03 acres. Earthwork and grading are required to create the grassed infiltration basin with pre-treatment forebay, designed to be easily mowed and maintained. Areas in which earthwork is required will grade new side slopes to a moderate 3:1 horizontal-to-vertical ratio. Drainage infrastructure will


Page 4 of 8

be installed along Route 60 (Squire Road) to route stormwater runoff to the basin to ensure that the runoff will be treated and total effective impervious cover decreased. Construction of four new drainage catch basins and three new manhole structures and the installation of approximately 730 feet of new drainage piping will direct stormwater runoff into the proposed basin. Proposed new piping, flared end sections, and riprap armored spillways will be installed within the basin to provide stabilization and to control flow through the treatment area. Riprap scour pads will also be placed at all drainage inlets and outlets to minimize erosive discharge velocities. Project plans are provided in Appendix C. 2.1 Protective Measures Measures will be taken to minimize sedimentation/siltation into the resource areas, corresponding buffer zones, and the surrounding community during construction activities. Implementation of accepted and usual methods of sedimentation erosion control will be used at the site during all phases of construction. Erosion control during construction will include the following: Compost filter tubes, or approved equivalent, will be placed as shown on the drawings to

protect wetland resource areas. Compost filter tubes, or approved equivalent, will be staked in place with the grain of the

material perpendicular to the ground. This will allow the erosion controls to conform to the landscape making it more effective.

Erosion control devices will be inspected weekly and after each significant rainfall event. Any entrapped silt or other materials will be removed. Compost filter tubes and other devices will be replaced as necessary.

Erosion control devices will remain in place locally until disturbed surfaces have been stabilized with the final vegetative cover in the area of disruption.

Any necessary temporary soil storage will be placed in a specified staging area and be surrounded by compost filter socks, or an approved erosion control method.

Details of the erosion controls are illustrated on Sheet 3 of the project plans. An operation and maintenance plan has been included in Appendix D. 3.0 Activities Subject to Regulations Although this project is intended to improve water quality, it is necessary to work within the Bordering Vegetated Wetlands (BVW) Buffer Zone to do so. The construction proposed within the buffer zone would consist of an infiltration basin, a forebay lined with armor material, a drainage outfall, riprap spillways, and associated grading. The disturbance area is estimated to be approximately 11,000 square feet. Resource area impacts are shown on Figure 2. 3.1 Description of Resource Area Impacts The project is partially located within the Bordering Vegetated Wetlands (BVW) 100-foot Buffer Zone, but does not fall within the adjacent resource area. The stormwater will infiltrate into the


Page 5 of 8

underlying soil from the infiltration basin, which is located within the Buffer Zone. Only positive resource area impacts are anticipated. The proposed project is not located within a Priority Habitat of Rare Species or within an Estimated Habitat of Rare Wildlife as shown on the map provided by the MassGIS Online Data Viewer in Appendix E. The proposed project is not located within a FEMA Zone flood boundary or within areas of the 100-year flood plain as shown on Flood Insurance Rate Map (FIRM) map in Appendix F. 3.2 Limited Project Status Several sections of 310 CMR 10.00 provide for limited project status for improving inadequate drainage systems and improving the natural capacity of a resource area to protect the interests identified in the Wetlands Protection Act. The following limited project standards apply:

10.53(3)f …maintenance and improvement of existing public roadways, but limited to widening less than a single lane, adding shoulders, correcting substandard intersections, and improving inadequate drainage systems. 10.53(4) …projects which will improve the natural capacity of a resource area(s) to protect the interests identified…

This project has been designed such that it will comply with all pertinent resource area performance standards as a resource area improvement project, as outlined previously. The above limited project provisions have been noted and, although this project would be eligible under 310 CMR 10.53(3)f and 10.53(4), no limited project status is requested. 3.3 Project Alternatives

Infiltration Basins Conceptually, the construction of an infiltration basin within the grassed island at the intersection of Routes 60 and 1 at Copeland Circle was examined. Workable land appeared available to redirect the flow from a modified drainage system for treatment in the proposed infiltration basin, with overflow discharging back into the existing drainage system. This area proved to be impractical based on the existing groundwater elevation. In order to redirect runoff west toward the grassed island the depth of pipes outletting within the grassed island would be below the high groundwater mark. The MWRA 30-inch water main runs through a corner of this island which would also limit the footprint of a basin.

An infiltration basin within the rotary infield is the recommended area for effective impervious cover reduction. The groundwater table is low enough in this area to accommodate a deeper drainage system and the sandy loam soils are also suitable for infiltration. This area also provides and available footprint to construct the basin outside of delineated wetland areas.


Page 6 of 8

Infiltration Swales

The use of infiltration swales is possible within the grassed areas of the intersection. Infiltration swales may require more grading to provide slope for the flow through the swale within the existing flat grassed island and infield. This will require deep cuts within the grassed island area that would not result in the maximum storage capacity allowable. While being an effective BMP, there appear to be better options for infiltrating and treating the stormwater runoff within the available areas in the grassed islands and infields. Subsurface BMPs Several typical subsurface infiltration BMPs were examined on a volume-per-linear-foot/ structure basis to estimate the footprint of land required to reach or assist in reaching the goal of 1.7 acres effective impervious cover (EIC) reduction. Each alternative would be an off-line BMP, meaning a pretreatment deep sump catch basin would be used prior to flow discharging into the off-line infiltration BMP. Based on the narrow workable area between the existing edge of pavement and the right-of-way line, the following alternatives were examined as potential BMPs along Route 60 (Squire Road):

Underground Infiltration Chambers

This alternative involves the use of HDPE underground infiltration chambers embedded in a stone trench. The typical chamber would be approximately 3 feet wide, and the typical stone trench surrounding it would be 8 feet wide. These chambers are estimated to provide 11.0 cubic feet of storage per linear foot installed, including storage within the stone. This alternative is not recommended based on cost of chambers compared to other alternatives.

Leaching Manholes

This alternative comprises a pretreatment deep sump catch basin discharging to a leaching manhole structure surrounded by an outer diameter of crushed stone. The typical leaching manhole would be approximately 5 feet inner diameter, and the typical stone surrounding it would be 8 feet in diameter. These chambers were estimated to provide approximately 113 cubic feet of storage per structure installed, including storage within the stone. This alternative is only recommended in areas of limited available right-of-way where existing catch basins allow for a retrofit option. Leaching manholes would only be used as an additional BMP to help reach the required EIC reduction goal.

Underground Infiltration Trenches

This alternative consists of the use of perforated HDPE pipe embedded in a stone trench. The typical stone trench used would be 6 feet wide encasing a perforated 24-inch pipe. These trenches were estimated to provide 8.9 cubic feet of storage per linear foot installed, including storage within the stone. This alternative would provide a cost savings of over 25% when compared to infiltration chambers. The conceptual location for this BMP type was within the 14-foot-wide grassed median between the east- and west-bound lanes. Brief conversations with MWRA personnel have determined this area is too close to their existing water main for security and resiliency issues. A leaching


Page 7 of 8

structure which would cause excessive groundwater in the vicinity of their pipe is something they believe would not be approved through their 8(m) Permit process. 3.4 Selected Alternative The chosen alternative is an infiltration basin in the large grassed infield of the Copeland Circle rotary. Section 2.0 provides a detailed outline of proposed work to be performed. 4.0 Conclusion MassDOT is proposing to implement water quality improvement project under its impaired water stormwater compliance program. Stormwater Best Management Practices will be installed within the watershed of Town Line Brook as part of MassDOT’s Impaired Waters Retrofit Initiative to improve water quality. The installation of new drainage structures and BMPs will address impaired waters and mitigate the impact of impervious cover from the MassDOT roadway in this area. No roadway expansion or increase in impervious area is proposed as part of the proposed BMP construction, the project is exclusively to treat stormwater runoff prior to reaching Town Line Brook and ultimately Pines River. The Resource Area impacts of the project are limited to the 100-foot buffer zone to BVW. MassDOT believes that the Revere Conservation Commission will find that the project as described in this NOI upholds the interests of the Wetlands Protection Act and respectfully requests that the Commission issues an Order of Conditions.

5.0 DEP Stormwater Standards & Report The following is an overview of project compliance with the ten stormwater standards. The installation of the above discussed infiltration basin will not create additional impervious area or stormwater volume. There will be no new discharges associated with this drainage system improvement project. The completed stormwater checklist is included as Appendix G. Supporting calculations to go along with the checklist are provided in Appendix H. Standard 1. No New Untreated Discharges

This is a stormwater treatment project that will provide treatment to existing untreated stormwater runoff. No new untreated discharges are proposed.

Standard 2. Peak Rate Attenuation No new impervious area is proposed. The infiltration basin installation will reduce peak rates as well as total runoff volume by providing infiltration and recharge to groundwater.

Standard 3. Recharge No new impervious area is proposed. The project will provide infiltration and an increase in recharge to groundwater thereby reducing effective impervious cover in the area.

Standard 4. Water Quality The proposed infiltration basin will result in improvements to stormwater management, water quality, and increased groundwater infiltration. The infiltration basin will provide treatment for approximately 2” of runoff from the


Page 8 of 8

surrounding subcatchment area. Upstream deep sump structures will be constructed to help capture any sediment prior to discharge.

Standard 5. Land Uses With Higher Potential Pollutant Loads N/A – The project is not in an area with higher potential pollutant loads.

Standard 6. Critical Areas N/A – According to the Natural Heritage & Endangered Species Program and the Division of Fisheries & Wildlife the project site is outside of the Priority and Estimated Habitats.

Standard 7. Redevelopments and Other Projects Subject to the Standards Only to the Maximum Extent Practicable This is a redevelopment project by way of stormwater treatment improvements.

Standard 8. Construction Period Pollution Prevention and Erosion and Sedimentation Control Project includes less than 1 acre of disturbance therefore not covered under the Construction General Permit. Erosion and sedimentation measures are discussed in Section 2.2 and identified on the project plans.

Standard 9. Operations & Maintenance Plan An Operations and Maintenance (O&M) Plan for the drainage system improvements and the infiltration basin has been completed and is included at the end of this report. See Appendix D for the full O&M Plan.

Standard 10. Prohibition of Illicit Discharges There are no illicit discharges to this drainage system.


Figures

1. Locus map based on USGS

7.5x7.5 Grid US Topo Map of

BOSTON NORTH, MA from

the USGS map webstore:

http://www.store.usgs.gov

2. Locus map is not to scale

Figure 1 USGS Locus Map Copeland Circle Revere, MA

Project Location


Attachment A

Project Site Photos


Attachment B

Test Pit Logs

Scott

Oval

Scott

Oval

Scott

Callout

PROPOSED TEST PIT LOCATION NOT ALLOWED BY MWRA

Scott

Callout

TEST PIT LOCATIONS

Scott

Oval

Scott

Callout

TEST PIT LOCATIONS

Scott

Text Box

TP-1

Scott

Text Box

TP-2

Report of Field Borings or Test Pits

BORING/TP:LOCATION:

DATE:

Comprehensive Environmental Incorprated

21 Depot Street Merrimack, NH 03054

PROJECT:

ENGINEER:

ELEV Depth

0

WL RemarksSymbol Description of Materials Matrix

2

4

6

8

10

12

GW seepage @ 5 ft.

16

14

TP # 1

7/23/2014

Revere, MA

Light BrownSandy Loam - wet substrate

Dark BrownOrganic Peat layer / Clay

V

GS Ground Surface

681-3MassDOT IWP

Topsoil

Urban FillLoamy Sand w/ large angular gravel and stones

Light BrownLoamy Sand w/ gravelsVery hard packed

Scott Salvucci

Intersection of Route 60 (Squire Rd) and western portion of Route 1 Rotary (Copeland Circle). Triangular grassed island.

Report of Field Borings or Test Pits

BORING/TP:LOCATION:

DATE:

Comprehensive Environmental Incorprated

21 Depot Street Merrimack, NH 03054

PROJECT: Revere, MA TP # 2

681-3 Within the grassed Route 1 rotary infield at the intersection of Route 60 and western portion of Copeland CircleMassDOT IWP

ENGINEER: 7/23/2014Scott Salvucci

ELEV Depth Symbol Description of Materials Matrix WL

0

Remarks

TopsoilGS Ground Surface

2

V GW seepage @ 5.5 ft.

4

6

8

10

12

14

16

Dark BrownSandy Loam

Light BrownSandy Loam

Light BrownWell Graded Sand

Coarse Sand


Attachment C

Project Plans


Attachment D

Operation & Maintenance Plan

Operation and Maintenance (O&M) Plan

for

Revere, Massachusetts Route 60 – Town Line Brook

Impaired Waters Remediation Project

Submitted To: City of Revere

Conservation Commission 281 Broadway

Revere, Massachusetts 02151

December 2014

Prepared For: Massachusetts Department of Transportation

10 Park Plaza Boston, Massachusetts 02116

Prepared By: Comprehensive Environmental Inc.

225 Cedar Hill Street Marlborough, Massachusetts 01752

ROUTE 60 TOWN LINE BROOK IMPAIRED WATERS REMEDIATION PROJECT - Revere, MA Operation and Maintenance (O&M) Plan

Route 60 Town Line Brook Impaired Waters Remediation Project Operation & Maintenance and Long Term Pollution Control Plan

Revere, MA Owner:

Massachusetts Department of Transportation 10 Park Plaza, Suite 4160 Boston, MA 02116

Entity Responsible for Plan Compliance:

Massachusetts Department of Transportation 10 Park Plaza, Suite 4160 Boston, MA 02116

Good Housekeeping Practices:

o Storage, disposal and stockpiling of snow as a result of plowing areas near the basin should be completed adjacent to the basin to allow snow melt to drain into the basin. Snow shall not be stored within the basin.

o Heavy equipment shall not be used within the infiltration basin, to avoid compaction of the bottom of the basin and interference with its infiltration function.

Maintenance Tasks:

o The stormwater management facility, including deep sump catch basins, infiltration basin, connecting piping and riprap outlet protection shall be inspected at least twice a year.

o The infiltration basin shall also be inspected following any storm event exceeding 2.5 inches in a 24-hour period (the one-year frequency storm). Evidence of standing water in the structure more than 72 hours following a storm would indicate possible failure of the infiltration surface. In that case, a qualified professional engineer should be retained to assess the cause of failure and recommend corrective action, which should be immediately implemented to restore the function of the system.

o The catch basins, flared end sections, and interconnecting piping are to be cleaned of sediment, debris and litter as needed to maintain flow capacity.

o Sediment shall be removed from pre-treatment devices (forebays) before exceeding a depth of 6 inches or before completely covering vegetation or stone surfaces.

o Deep sump catch basins are to be inspected for evidence of hydrocarbons. If observed the material shall be immediately removed using absorbent pads or other suitable measures.

o Disposal of sediment and other materials from cleaning the drainage facilities shall be conducted according to local, state, and federal regulations.

o The embankments of the basin shall be inspected at least annually. Any woody vegetation shall be removed, animal burrows shall be carefully filled with compacted soil material, and other conditions that could affect the integrity of the embankment or check dams shall be addressed as needed.

ROUTE 60 TOWN LINE BROOK IMPAIRED WATERS REMEDIATION PROJECT - Revere, MA Operation and Maintenance (O&M) Plan

o The basin shall be mowed at least annually using a lawn mower with a bag or materials/clippings shall be removed after each mowing. Weeds shall be removed as needed, unhealthy areas of grass shall be aerated and reseeded with a grass seed mix as needed.

o The basin floor are to be maintained to prevent scouring; channelized scour paths are to be graded to level the swale floor, and reseeded with the basin seed mix.

Source of Long Term O&M Funding:

MassDOT maintenance budgets

Operations & Management for Infiltration Basin

Procedure Objective Frequency

Preventative Maintenance

Mow the side slopes, and basin bottom. Remove sediment,

trash and debris as well as grass clippings and accumulated

organic matter from forebay and basin.

At least once a year. Mow as needed.

Inspections

Inspect the infiltration basin to ensure proper functioning. Make sure vegetation is adequate and slopes are not eroding. Check

for rilling and gullying.

After every major storm during the first 3 months of operation and twice

a year thereafter. Spillways and forebays should be inspected after

every significant rainfall event.

Infiltration

Inspect for standing water in the swale more than 72 hours

following a major storm. This would indicate possible failure

of the infiltration surface.

After every major storm during the first 3 months of operation and twice

a year thereafter. A qualified professional engineer should be

retained to assess the cause of failure and recommend corrective action.

Cleaning/Repair

Inspect and clean outfalls and armored spillways. Repair

eroded areas and re-vegetate. Remove large woody vegetation and debris from riprap armoring and spillways to ensure capacity

is maintained

Every other month recommended and at least twice a year and after every major storm event. Repair

when necessary.

Infiltration Basin Maintenance Record

Date Sediment Removed (volume)

Infiltration Basin Maintenance Performed (including depth of sediment)

Maintenance Personnel

Comments

Operations & Management for Deep Sump Catch Basin

Procedure Objective Frequency

Surface Inspection

Remove sediment and debris from the surface grate to prevent

street flooding.

Performed quarterly for the first year and after heavy storms. Establish a specific schedule based on previous

years capacity inspections.

Interior and Sump Sediment

Removal

Maintain flow capacity. Inspect and remove sediment

prohibiting outflow at pipe discharge.


years capacity inspections. (minimum annually)

Hydrocarbons

Visually inspect for evidence of hydrocarbons – oils & sheen.

Remove using absorbent pads or other suitable measures. Dispose of according to local, state, and

federal regulations.

During regular maintenance events.

Pipe Inspection Remove accumulated sediment

to maintain flow capacity through inlet and outlet pipes.


years capacity inspections.

Catch Basin No._______ Maintenance Record

Date Sediment Removed (volume)

Deep Sump Catch Basin Maintenance Performed (including depth of sediment)

Maintenance Personnel

Comments


Attachment E

Natural Heritage & Endangered Species Program

Priority Habitat Areas


Attachment F

FIRM Map


Attachment G

Stormwater Checklist


Attachment H

Drainage Calculations

Job # 607174 BSC #19 ‐ Revere

Calculated By: WAD 12/11/2014

Checked By: BCL 12/12/2014

Cut Area (sf)

Average Cut Area (sf)

Cut Volume

(cy)Fill Area (sf)

Average Fill Area (sf)

Fill Volume

(cy)

Net Change at

Each Elevation

(cy)

Cut / Fill

2.5 to 3.0 1440 1440 26.7 0.0 0.0 0.0 26.7 CUT

3.0 to 4.0 2150.9 1795.5 66.5 0.0 0.0 0.0 66.5 CUT

4.0 to 5.0 3011.2 2581.1 95.6 0.0 0.0 0.0 95.6 CUT

5.0 to 6.0 3652.3 3331.8 123.4 332.8 166.4 6.2 117.2 CUT

6.0 to 7.0 739.1 739.1 27.4 1250.7 1250.7 46.3 18.9 FILL

7.0 to 7.5 634.0 686.6 12.7 694.9 972.8 18.0 5.3 FILL

7.5 to 8.0 514.6 574.3 10.6 0.0 347.5 6.4 4.2 CUT

8.0 to 9.0 260.4 387.5 14.4 0.0 0.0 0.0 14.4 CUT

9.0 to 10.0 115.2 187.8 7.0 0.0 0.0 0.0 7.0 CUT

10.0 to 11.0 32.2 73.7 2.7 0.0 0.0 0.0 2.7 CUT

387 77 √

Net CUT Volume (cy) 310 √

* Note: Fill area calculations only accounted for to elevation 7.5 (top of berm).

Elevation Cut‐Fill Quantity Sheet (Total Project Area)

Elevation

Total Cut Volume (cy) Total Fill Volume (cy)

Project # 607174 BSC #19 ‐ Revere

Calculated By: SCS 12/10/2014


Required Effective Impervious Cover Reduction

EIC = 1.70 acres

EIC = IC * Reduction Credit

Effective IC Reduction Credit for Infiltration BMPFrom Table 2 - Infiltration BMPs Effective IC Reduction Credit

BMP Storage Reduction

BMP Type (inches) Credit

Infiltration Structures 1.02 1.00 91%

Infiltration Structures 1.02 2.00 98%

Hydrologic Soil Properties

Infiltration Rate

Texture Class HSG (inches/hour) CN

Sandy Loam B 1.02 61

Required Impervious Cover ReductionBased on EIC=1.7 acres, 1-inch storage, 91% Reduction Credit

IC = 1.87 acres

IC = EIC / Reduction Credit

Required Volume of Stormwater Treated by BMP to Receive EIC Reduction Credit for 1-Inch BMP StorageDSW = VINFILTRATED / IC

DSW = 1.00 inches

DSW = Depth of Stormwater Treated (inches)

VINFILTRATED = Storage Volume of the Infiltration Structures (cubic feet)

IC = Contributing Impervious Cover area (acres)

Required VINFILTRATED = 6,781 cubic feet Required to meet EIC Reduction = 1.7 acres

Provided Impervious Cover Reduction

IC = 1.03 acres √

Infiltration Rate (in/hr)

Route 60/Route 1 Required Infiltration Volume




Land Use AREA (ac) AREA (sf) % Impervious Impervious Area (sf)2"

WQv (cf)1"

WQv (cf)0.1"

WQv (cf)

Forebay Volume

(cf)

Basin Volume

(cf)Roadway (MassDOT) 1.06 46,000 100 46,000 7,667 3,833 383

Grass 0.10 4,356 5 218 36 18 2

TOTAL 1.16 50,356 46,218 7,703 3,851 385 422 7,365 √

*BMP located within Interim Wellhead Protection Area (IWPA). Requires ≥44% TSS removal prior to discharge into an infiltration structure.

Required StorageWQv = (D / 12) * A

WQv = Water quality volume - defined as 1 inch of runoff over the impervious area (cubic feet)

D = Water depth - as stated previously (inches)

A = Impervious area - impervious area contributing to BMP watershed (square feet)

Drainage Area Water Quality Volume

BMP‐1 INFILTRATION BASIN




Depth of Stormwater Treated by BMP-1DSW = VBASIN / IC

DSW = Depth of Stormwater Treated (inches)VBASIN = Storage Volume of the Basin (cubic feet)

IC = Contributing Impervious Cover area (acres)

IC = 1.06 acresDSW = 1.92 inches

Hydrologic Soil Properties

Infiltration Rate

Texture Class HSG (inches/hour) CN

Sandy Loam B 1.02 61

Effective IC Reduction Credit for Infiltration BMPFrom Table 2 - Infiltration BMPs Effective IC Reduction Credit

BMP Storage Reduction

BMP Type (inches) Credit

Infiltration Swale 1.02 1.92 97.6%

Effective Impervious Cover ReductionEICR = IC * Reduction CreditEICR = 1.03 acres

Infiltration Rate (in/hr)





ElevationArea(sf)

Avg Surface

Area

Incremental Storage

(cf)

AccumulatedStorage

(cf)2.50 182 0 0 0

3.00 243 213 106 106

4.00 388 316 316 422

5.00 561 475 475 896

Total Volume 422 √

422 √

ElevationArea(sf)

Avg Surface

Area

Incremental Storage

(cf)

AccumulatedStorage

(cf)3.00 1,197 0 0 0

4.00 1,763 1,480 1,480 1,480

5.00 3,011 2,387 2,387 3,867

6.00 3,985 3,498 3,498 7,365

7.00 4,861 4,423 4,423 11,788

Total Volume 11,788 √

7,365 √Total Storage Volume (cf)

Infiltration Basin Volume


Forebay Volume

Total Forebay Storage Volume (cf)





Design StormRainfall

(in)Peak Runoff

(ft3/s)

Runoff

Volume (ft3)

Infiltration Basin

Volume (ft3)2-Year 3.20 3.10 12,601 7,787

10-Year 4.60 4.95 19,847 7,787

25-Year 5.50 6.20 24,780 7,787

100-Year 6.60 7.79 31,010 7,787

Note: Runoff Volume and Peak Runoff values from Storm and Sanitary Analysis Model (provided in Appendix)

Drainage Area Runoff Volume




Storage AreaStorage

Volume (cf)

Hydraulic Soil Group

(HSG)

Infiltration Rate - K (in/hr)

Surface Area (sf)

Drain Time (hrs)

North Forebay 422 B 1.02 561 9 √

Basin 7,365 B 1.02 4,861 18 √

Note: Infiltration Rate = 1.02 in/hr (Sandy Loam - 1982 Rawls Rates)

TimeDRAIN = SV / (K * SA) Within 72 Hours

TimeDRAIN = Drain Time - Time it takes the area in each forebay and basin to drain completely (hours)SV = Storage Volume (cf)

K = Infiltration Rate - saturated hydraulic conductivity (feet/hour)

SA = Surface Area - surface area of recharge area (square feet)

Infiltration Basin Drain Time




Length of Riprap Apron (ft)

Width of Riprap

Apron (ft)

9.8 15.0

Note: Peak Runoff values from Storm and Sanitary Analysis Model (provided in Appendix)

Weir Length = 15.0 ft

Top of Spillway Elev = 5

Bottom of Spillway Elev = 4.0Spillway Slope Length = 3 ft

Spillway Slope = 33.33%

100 Yr-Storm Q = 7.8 cfs

100 Yr-Storm Basin Elev = 4.3

Basin Floor Elev = 2.5

Spillway Elev = 4.0

Depth of Flow = 0.32 ft

t = 2 :1

Area of Flow 5.0 ft2

Velocity (V = Q/A) = 1.55 fps →Riprap Spec "Modified"

Length of Riprap Apron (Minimum Tailwater Condition)

La = ((1.80*(Q - 5))/Sp1.5) + 10

Sp = 15.0 maximum inside span for non-circular sections (ft)

La = 9.8 length of apron (ft)

Riprap Size

d50 = (0.0125Rp2/TW)(Q/Rp

2.5)1.333

Rp = Sp = 15.0 maximum inside span for non-circular sections (ft)

TW = 0.1 tailwater (ft)

d50 = 0.10 median stone size required (ft)

1.25 median stone size required (in)

Therefore, Choose "Modified" stone size

Use Modified Rock Fill

Riprap Spillway Sizing ‐ Forebay to Infiltration Basin

Modified < 8 fps

Standard 8-inch < d50 < 15-inch

Standard 10 - 14 fps

Special Design > 14 fps

Intermediate 8 - 10 fps

Site100-Year Design Storm

Peak Runoff (cfs)

Forebay 7.77

Riprap Specification Outlet Velocity

Special Design 15-inch < d50

Riprap Specification d50 Size

Modified d50 < 5-inch

Intermediate 5-inch < d50 < 8-inch




Length of Riprap Apron (ft)

Width of Riprap

Apron (ft)

9.8 15.0

Note: Peak Runoff values from Storm and Sanitary Analysis Model (provided in Appendix)

Weir Length = 15.0 ft

Top of Spillway Elev = 7.5

Bottom of Spillway Elev = 6.0Spillway Slope Length = 3 ft

Spillway Slope = 50.00%

100 Yr-Storm Q = 7.1 cfs

100 Yr-Storm Basin Elev = 6.3

Basin Floor Elev = 3.0

Spillway Elev = 6.0

Depth of Flow = 0.29 ft

t = 3 :1

Area of Flow 4.6 ft2

Velocity (V = Q/A) = 1.55 fps →Riprap Spec "Modified"

Length of Riprap Apron (Minimum Tailwater Condition)

La = ((1.80*(Q - 5))/Sp1.5) + 10

Sp = 15.0 maximum inside span for non-circular sections (ft)

La = 9.8 length of apron (ft)

Riprap Size

d50 = (0.0125Rp2/TW)(Q/Rp

2.5)1.333

Rp = Sp = 15.0 maximum inside span for non-circular sections (ft)

TW = 0.1 tailwater (ft)

d50 = 0.09 median stone size required (ft)

1.11 median stone size required (in)

Therefore, Choose "Modified" stone size

Use Modified Rock Fill

Riprap Specification Outlet Velocity

Riprap Spillway Sizing ‐ Infiltration Basin Spillway

Site100-Year Design Storm

Peak Runoff (cfs)

Infiltration Basin 7.12

Modified < 8 fps

Intermediate 8 - 10 fps

Standard 10 - 14 fps

Special Design > 14 fps

Riprap Specification d50 Size

Modified d50 < 5-inch

Intermediate 5-inch < d50 < 8-inch

Standard 8-inch < d50 < 15-inch

Special Design 15-inch < d50




Peak Flows for Design Storms

10 Year Storm Event Runoff Q = 4.58 cfs


Flow Capacity and Average Velocity with 1 foot freeboard over the Spillway

V = (1.49 r2/3 * s1/2)/nV = average velocity (ft/s) a = 15.0 sfr = hydrailuc radius (ft) = a/pw pw = 17.0 ft

where a=cross sectional flow area (ft2) r = 0.88 ft

pw=wetted perimeter (ft) s = 0.05 ft/ft

s = channel slope (ft/ft) n = 0.03

n = Manning's roughness coefficient V = 9.29 ft/s √

Q = VA V = 9.29 ft/s

Q = capacity (cfs) A = 15.0 sf

V = velocity (ft/s) Q = 139.3 cfs √

A = cross sectional area (ft2)

Check - Max Flow Depth and Velocity over the Spillway - 100 Yr Storm

Q = C L H3/2

Q = discharge (cfs) Q = 7.8 cfs

C = coefficient of discharge C = 2.8 (assumed)

L = length of spillway L = 15.0 ft

H = height of water above the spillway H = 0.3 ft √

Q = V A


A = area based on Depth of Flow Over Spillway A = 1.8 sf

V = Resulting velocity based on peak flow & depth (ft/s) V = 4.4 ft/s √

Depth of Flow Over Spillway

Velocity of Flow Over Spillway

Revere Route 60/Route 1 ‐ Forebay Spillway Sizing

1' Freeboard - Max Velocity

1' Freeboard - Spillway Capacity




Peak Flows for Design Storms



Flow Capacity and Average Velocity with 1 foot freeboard over the Spillway

V = (1.49 r2/3 * s1/2)/nV = average velocity (ft/s) a = 7.5 sfr = hydrailuc radius (ft) = a/pw pw = 18.0 ft

where a=cross sectional flow area (ft2) r = 0.42 ft

pw=wetted perimeter (ft) s = 0.03 ft/ft

s = channel slope (ft/ft) n = 0.03

n = Manning's roughness coefficient V = 4.36 ft/s √

Q = VA V = 4.36 ft/s

Q = capacity (cfs) A = 7.5 sf

V = velocity (ft/s) Q = 32.7 cfs √

A = cross sectional area (ft2)

Check - Max Flow Depth and Velocity over the Spillway - 100 Yr Storm

Q = C L H3/2


C = coefficient of discharge C = 2.8 (assumed)

L = length of spillway L = 15.0 ft

H = height of water above the spillway H = 0.3 ft √

Q = V A


A = area based on Depth of Flow Over Spillway A = 1.8 sf

V = Resulting velocity based on peak flow & depth (ft/s) V = 4.0 ft/s √

Revere Route 60/Route 1 ‐ Basin Spillway Sizing

1' Freeboard - Max Velocity

1' Freeboard - Spillway Capacity

Depth of Flow Over Spillway

Velocity of Flow Over Spillway

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