mile long segment of a multi-use recreational trail. Work includes; - - PowerPoint PPT Presentation

• ARRT through Maynard and Acton is a 3.42-

mile long segment of a multi-use recreational trail.

• Work includes;

– Construction of paved 8 to 12 foot wide multi-use recreational trail with one to two foot graded stone dust shoulders on either side; – Construction of a parking lot at Winter Street and Florida Road; – Replacement of the existing pedestrian bridge

• ver the Assabet River in downtown Maynard

with a 65’ long prefabricated steel truss bridge.

• May 1997: The five ARRT communities (Marlborough, Hudson,

Stowe, Maynard, and Acton) received $668,000 in state funding to acquire the rights-of-ways of the former rail line

• September 2002: The town of Maynard acquires all necessary land

rights to allow for the construction of the ARRT

• October 2004: ARRT volunteers completed a 12 month effort to

clear and place woodchips on two sections of the trail, each 1000 feet in length. The woodchips create an interim walking path, until the final bike path is built.

• November 2011: Maynard/Acton 25% Design completed by AECOM
• March 2014: Rail road rails removed from length of trail in Maynard

& Acton

Existing Resource Areas

Existing Resource Areas – Taylor Brook

Existing Resource Areas – Assabet River at Tobin Park

Existing Resource Areas – Intermittent Streams/RR Ditches

Existing Resource Areas – Pratt’s Brook (Acton)

Permit Requirements

Permit Requirements

• WPA – Process ongoing
• MassDEP has issued File No. 213-0262 for NOI
• ORAD confirming resource area boundaries issued by

Maynard Conservation Commission on 12/4/14

• Section 404 ACOE Individual Permit
• Section 401 Water Quality Certification
• Chapter 91 Waterways filed and pending
• MEPA – ENF filed on 3/9/15; Awaiting comment
• Categorical Exclusion Checklist
• MassDOT Hazardous Materials Clearance
• Section 106 Clearance

Resource Area Impact Summary

Impact Summary

• Total Permanent and temporary vegetated wetland alteration is 635.73 square feet.
• Based on the “no-rise” results of the hydraulic analyses1, compensatory storage volume is

not being proposed for the BLSF embankment encroachment at Taylor Brook and the transitional ramp fill in Tobin Park. Work within BLSF will not restrict flows or result in an increase in flood stage or velocity.

• Total 200-foot Riverfront Area is approximately 255,275 square feet.

Total 200-foot Riverfront Area alteration is approximately 54,181 square feet, of which 17,190 square feet is within the Inner 100-feet. 27,875 of the 54,528 square feet (51%) of Riverfront Area to be impact in Maynard is Previously Developed Riverfront Area under the Act at 310 CMR 10.58 (5). Additionally, 117 square feet of Riverfront area alteration is associated with a limited project.

1HEC-RAS Analysis Assabet River Rail Trail Acton & Maynard, Massachusetts MassDOT Project #604531; Prepared by Nover-

Armstrong Associates, Inc; prepared for Greenman-Pedersen, Inc.; dated November 2014.

Table 1: Wetland Resource Area Impacts - Maynard - Assabet River Rail Trail

ROW STA

• No. #

Brook Name Wetland Resource Area Impacts Comments BVW/VW Bank(lf) BLSF Sq. ft BLSF c.f. LUW/other Waters of the U.S.

• Perm. (sf) Temp. (sf)
• Perm. (sf) Temp. (sf)

TOTAL 262.89 372.84 1478.70 1329.92 357.75 5784.00 1936.51

Impact Summary – Taylor Brook

• Reduction in parking

spaces at Ice House Landing Parking lot has minimized outer RA impact in the area from 15,775 square feet to 13,106 square feet.

BLSF REGION 1

• STA. 13+00 to STA. 19+00 ( 276.36 SF)

Interval Volume by Interval (CY) 177-178 178-179 0.42 179-179.4 0.72 Total 1.14

Proposed Ice House Landing Parking Area

Impact Summary – Assabet River/Pedestrian Bridge

BLSF REGION 2

• STA. 65+00 to STA. 66+00 (1053.56 SF)

Interval Volume by Interval (CY) 158-159 0.00 159-159.96 12.11 Total 12.11

Following the issuance of the NOI, parking was added at Sta. 62+00 before the Maynard Bridge. This increased the outer riparian riverfront impacts here from 9,149.65 square feet to 11,124.77 square feet.

Impact Summary – Intermittent Streams/RR Ditches

Impact Summary – Intermittent Streams/RR Ditches

• AECOM Appendix

B Wildlife Habitat Evaluation reached a finding

• f “no substantial

reduction in the capacity to provide important wildlife habitat functions identified within the Bank Impact Areas”.

ROW STA No. # Brook Name Wetland Resource Area Impacts Comments BVW/VW Bank(lf) LUW/other Waters of the U.S. Perm. (sf) Temp. (sf) Perm. (sf) Temp. (sf) 102+50 Railroad drainage swale 1173.05 Permanent impacts to LUW meet all performance standards detailed at 310 CMR 10.56(4). 103 + 25 Railroad drainage swale 182.40 Bank restoration proposed at impact location. 105+75 Railroad drainage swale 1327.03 Temporary LUW impacts to be restored at impat location. 108+50 to 109+50 Railroad drainage swale 1028.90 3385.56 Bank restoration proposed at impact location. Permanent impacts to LUW will meet all performance standards detailed at 310 CMR 10.56(4). 110 + 00 RT Railroad drainage swale 126.41 Permanent impacts to BVW to be fully replicated. 110+50 Railroad drainage swale 194.43 1225.39 310.40 Temporary impacts to BVW to be restored in place. Permanent impacts to LUW will meet all performance standards detailed at 310 CMR 10.56(4) 111 + 00 Railroad drainage swale 267.40 Impacts to bank to be fully restored at impact location. 112+50 Railroad drainage swale 214.40 Temporary LUW impacts to be restored at impact location. 120+00 Railroad drainage swale 84.68 Temporary LUW impacts to be restored at impact location. TOTAL 126.41 194.43 1478.70 5784.00 1936.51

Mitigation

Mitigation Area 1

• Located approximately

280 feet west of the bank of Taylor Brook

• 150 square feet in size

Mitigation Area 2

• Located approximately 1000 feet South of

the Maynard/Acton town boundary and West of Brown Street (Route 27).

• 1,650.8 square feet in size
• Provides mitigation for impacts associated

with the intermittent streams/RR ditches.

Mitigation Summary

• The replication areas have been designed to comply with the General

Performance Standards listed at 310 CMR 10.55(4)(b)(1-7).

BVW Alteration

262.89

Square feet BVW Mitigation

1800.8

Square feet

NHESP Mapped Vernal Pool

NHESP Mapped Vernal Pool

• NHESP Mapped Certified

Vernal Pool (CVP #4183) located at within Assabet River National Wildlife Refuge in Stowe, approximately 350 feet southwest of the beginning of the Trail in Maynard.

• The CVP is separated from

the project limits by the presence of White Pond Road.

• An additional depression,

not mapped by NHESP, is identified on the Project plans in the vicinity of Taylor Brook at approximately Sta. 22+50 to 24+00.

Stormwater Compliance

• The Project will meet the Stormwater

Standards at M.G.L.c.131, Sec. 40 to the maximum extent practicable as required by all footpath, bikepath and path for pedestrian and/or non-motorized vehicle Projects.

• Meets Stormwater Standards 1,2,3,6,7,8,9
• Meets Stormwater Standard 4 to the

extent practicable

• Stormwater Standard 5 not applicable