Release Abatement Measure completion report and permanent solution statement : commercial property 343-349 Summer Street, Somerville, Massachuset / prepared for: 351 Summer LLC c/o The Maggiore Companies ; prepared by: EnviroTrac Ltd

2017·14.7 MB·English

by  EnviroTrac, Ltd.

RELEASE ABATEMENT MEASURE
COMPLETION REPORT AND PERMANENT
SOLUTION STATEMENT
Commercial Property
343-349 Summer Street
Somerville, Massachusetts 01607
RTN 3-33735
August 8, 2017
Prepared for:
351 Summer LLC
c/o The Maggiore Companies
13 Wheeling Avenue
Woburn, Massachusetts
Prepared by:
EnviroTrac Ltd.
2 Merchant Street, Suite 2
Sharon, Massachusetts 02067
A Full Service Environmental Consulting
and Contracting Firm

RAM Completion Report and Permanent Solution Statement
Commercial Property, 343 Summer St., Somerville, MA; RTN 3-33735 August 8, 2017
TABLE OF CONTENTS
Page #
I. 0 INTRODUCTION.1
2.0 AREA AND DISPOSAL SITE DESCRIPTIONS [310 CMR 40.1056(2)(A)].1
2.1 Area Description.1
2.2 Disposal Site Description.2
2.3 Sensitive Receptors.2
3.0 RELEASE HISTORY.2
4.0 DESCRIPTION OF RELEASE CONDITIONS [310 CMR 40.0446(4)(A)].2
4.1 UST#1.2
4.2 UST#2.3
4.3 Post-Excavation.3
5.0 DESCRIPTION OF RELEASE ABATEMENT MEASURE [310 CMR 40.0446(4)(B)].3
5.1 Summary Of Assessment and/or Response Actions Completed [310 CMR
40.0446(4)(C)].4
6.0 DISPOSAL SITE CHARACTERIZATION.4
6.1 Soil and Groundwater Classification.4
6.2 Contaminants of Concern.5
7.0 CONCEPTUAL SITE MODEL [310 CMR 40.1056(2)(B)].5
7.1 Site Description and Source of Impacts.5
7.2 Disposal Site Geology and Hydrogeology.6
7.3 Extent of Disposal Site [310 CMR 40.1 056(2)(a)].6
7.4 Evaluation of Hot Spots [310 CMR 40.0006].6
8.0 EXPOSURE ASSESSMENT.7
8.1 Environmental Fate and Transport Characteristics.7
8.3 Current and Potential Receptors.7
8.4 Current and Potential Environmental and Ecological Receptors.7
8.5 Potential Future Use [310 CMR 40.1056(1 )(e), (f), and (g)].8
8.6 Exposure Point Concentrations.8
9.0 METHOD 1 RISK CHARACTERIZATION.8
9.1 Characterization of Risk of Harm to Human Health.8
9.2 Characterization of Risk of Harm to Public Welfare.9
9.3 Characterization of Risk of Harm to Safety.9
9.4 Characterization of Risk of Harm to the Environment.9
10.0 SOURCE CONTROL AND CONTROL OF SUBSURFACE MIGRATION [310 CMR
40.1056(2)(C) AND (D)].9
II. 0 LIGHT NONAQUEOUS PHASE LIQUID MOBILITY [310 CMR 40.1056(2)(3)].9
12.0 UPPER CONCENTRATION LIMITS [310 CMR 40.1056(1 )(J)].10
13.0 OPERATION, MAINTENANCE, AND/OR MONITORING [310 CMR 40.1056(2)(L)].10
14.0 FEASIBILITY EVALUATION [310 CMR 40.1056(2)(G)].10
15.0 DATA USEABILITY AND REPRESENTATIVENESS EVALUATION [310 CMR
40.1056(1)(K) AND (2)(K)].10
15.1 CSM Summary.11
15.2 Use OF Field Screening Data.11
15.3 Sampling Rationale - Number, Spatial Distribution, and Handling of Samples.11
15.4 TEMPORAL Distribution of Samples.11
15.5 Completeness.11
15.6 Inconsistency AND Uncertainty.11
15.7 Information Considered Unrepresentative.12
15.8 Data Usability Assessment.12
Page ii
Enviroirac
Environmental Services
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RAM Completion Report and Permanent Solution Statement
Commercial Property, 343 Summer St., Somerville, MA; RTN 3-33735 August 8, 2017
16.0 MANAGEMENT OF REMEDIATION WASTE [310 CMR 40.0446(4)(E)].13
17.0 FINDINGS AND CONCLUSIONS OF THE PERMANENT SOLUTION.13
18.0 FINDINGS AND CONCLUSIONS OF THE RAM [310 CMR 40.0446(4)(D) & (F)].13
19.0 PUBLIC NOTIFICATION CORRESPONDENCE [310 CMR 40.1403(D), (F), & (H),
40.1406, AND 40.0446].14
FIGURES
Figure 1 Locus Map
Figure 2 Site Plan
Figure 3 MassGIS Priority Resource Map
TABLES
Table 1 Summary of Soil Data
Table 2 Summary of Soil Exposure Point Concentrations
APPENDICES
Appendix A Remediation Waste Documentation - 2016
Appendix B Soil Laboratory Reports
Appendix C Remediation Waste Documentation - 2017
Appendix D Public Notification Letters
Appendix E RAM Plan Public Comment Response
Page iii
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Environmeriial Services
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RAM Completion Report and Permanent Solution Statement
Commercial Property, 343 Summer St., Somerville, MA; RTN 3-33735 August 8, 2017
1.0 INTRODUCTION
EnviroTrac Ltd. (EnviroTrac) prepared this Release Abatement Measure Completion (RAMC)
Report and Permanent Solution Statement (PSS) on behalf of 351 Summer LLC for the
commercial property located at 343-349 Summer Street in Somerville, Massachusetts (the Site).
This RAMC/PSS is being submitted to the Massachusetts Department of Environmental
Protection (MassDEP) to address Release Tracking Number (RTN) 3-33735 and was prepared
in accordance with the requirements of the Massachusetts Contingency Plan (MCP) as set forth
at 310 CMR 40.1040, 40.1041, and 40.1056.
On August 8, 2016, EnviroTrac monitored the completion of tests pits excavated by Koster and
Sons Construction, Inc. During the test pit activities, an UST was encountered and damaged by
the backhoe. As the result of the UST damage, approximately 20-30 gallons of petroleum was
released to the surrounding soil. The released petroleum constituted a Sudden Release, which
met the MCP two-hour notification criteria. In response to the release, both the MassDEP and
the Somerville Fire Department were notified. Upon notification, MassDEP assigned RTN 3-
33735 to the release. Further details relating to the release are discussed in Section 4.0.
During August and September, 2016 IRA field activities were conducted. The current property
owner, 351 Summer LLC, acquired the property on February 6, 2017 from The Dakota Group.
An Immediate Response Action Plan and IF^ Completion Report for RTN 3-33735 were
submitted to MassDEP on March 16, 2017.
Based on the results of a Method 1 Risk Characterization (M1RC), a condition of No Significant
Risk (NSR) has been achieved for RTN 3-33735. Other conditions applicable to a Permanent
Solution (310 CMR 40.1040(1)) and a Permanent Solution with No Conditions (310 CMR
40.1041(1)) have also been achieved. This PSS is not related to any other Permanent or
Temporary Solution Statements and is applicable to the entire Disposal Site; therefore,
additional Response Actions are not required for any other portion of the Disposal Site (310
CMR 40.1056(1)(d)).
2.0 AREA AND DISPOSAL SITE DESCRIPTIONS [310 CMR 40.1056(2)(a)]
2.1 Area Description
The Site is comprised of one parcel of land and is located at 343-349 Summer Street in
Somerville, Massachusetts. The parcel is identified by the City of Somerville Assessor’s Office
as Map #25, Block D, Lot #33. A Locus Map is provided as Figure 1.
The Site consists of a 0.39 acre irregular-shaped vacant parcel of land located in an area of
mixed commercial and residential use. The Massachusetts Bay Transportation Authority (MBTA)
Red Line runs directly below the Site within a bedrock tunnel approximately 80 feet below
ground surface (bgs). A MBTA Red Line vent structure is located at the southern portion of the
parcel.
Historical records indicate that the Site had been the location of residential dwellings and a
garage structure.
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