Class B-1 response action outcome partial statement for 2-4 Alston Street, Somerville, Massachusetts : 50 Tufts Street site, Somerville, Massachusetts / submitted to UniFirst Corporation ; submitted by GEI Consultants

2012·3.5 MB·English

by  GEI Consultants

(<f1o 6 ^
Geotechnical
Environmental
Water Resources
Ecological
MassDEP RTN 3-23246
Class B-1 Response Action Outcome
Partial Statement for 2-4 Alston
Street, Somerville, Massachusetts
50 Tufts Street Site, Somerville, Massachusetts
Submitted to:
UniFirst Corporation
68 Jonspin Road
3£ 3
Wilmington, MA 01887
I
Submitted by;
GEI Consultants, Inc.
400 Unicom Park Drive
Woburn, MA 01801
781-721-4000
February 2, 2012
Project 04516-3

MassDEP RTN 3-23246
Class B-1 Response Action Outcome Partial Statement
for 2-4 Alston Street, Somerville, Massachusetts
50 Tufts Street Site, Somerville, Massachusetts
UniFirst Corporation
February 2, 2012
Table of Contents
Executive Summary iv
1. Introduction 1
1.1 Purpose 1
1.2 Scope 2
1.3 Submittals 2
1.4 Public Record 2
1.5 Contact Information 2
1.6 Conceptual Site Model 3
1.6.1 Property Location and Description 3
1.6.2 Contaminant Distribution 3
2. Property Investigations 4
2.1 Groundwater Sampling 4
2.2 Soil Sampling 4
2.3 Indoor Air Sampling 5
3. Evaluation of Vapor intrusion Pathway 6
4. Method 1 Risk Characterization 7
4.1 Current and Reasonably Foreseeable Site Activity and Use 7
4.2 Potential Human Receptors 8
4.3 Potential Environmental Receptors 8
4.4 Summary of Analytical Results 8
4.4.1 Soil 8
4.4.2 Groundwater 8
4.4.3 Hot Spot Evaluation 9
4.5 COPCs 9
4.6 Soil and Groundwater Categories 9
4.6.1 Soil Categories 9
4.6.2 Groundwater Categories 10
4.7 Identification of EPCs 10
4.7.1 Groundwater EPCs 10
4.8 Comparison of EPCs to MCP Standards 11
4.9 Characterization of Risk of Harm to Safety 11
4.10 Conclusions 11
5. Representativeness Evaluation and Data Usability Assessment 12
5.1 Conceptual Site Model 12
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MassDEP RTN 3-23246
Class B-1 Response Action Outcome Partial Statement
for 2-4 Alston Street, Somerville, Massachusetts
50 Tufts Street Site, Somerville, Massachusetts
UniFirst Corporation
February 2, 2012
5.2 Field and Screening Data 12
5.3 Sampling Rationale, Distribution, and Data Completeness 12
5.4 Data Usability Assessment 13
5.5 Data Usability Criteria 13
5.6 Statement of Suitability 13
6. Class B-1 Response Action Outcome Partial Statement_14
6.1 Operation, Maintenance, and/or Monitoring 14
7. Limitations 15
Tables
1. Chemical Testing Results - Groundwater
2. Chemical Testing Results - Soil
3. Chemical Testing Results - Indoor Air
4. Exposure Point Concentrations - Groundwater
Figures
1. Site Location Map
2. 2-4 Alston Street - Portion of the Site Subject to the Class B-1 RAO
Appendices
A. MassDEP Transmittal Form (BWSC-104) “Response Action Outcome (RAO)
Statement”
B. Public Notification Documentation
MLD/MCE/JDR/ISG:csh
N:\04516\19.0 Reports in Progress\19.10 Partial RAOsWVave 1\Alston Street\2-4 Alston\2-4 Alston Class B-1 RAO-P 2012-02-02.DOCX
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MassDEP RTN 3-23246
Class B-1 Response Action Outcome Partial Statement
for 2-4 Alston Street, Somerville, Massachusetts
50 Tufts Street Site, Somerville, Massachusetts
UniFirst Corporation
February 2, 2012
Executive Summary
On behalf of UniFirst Corporation (UniFirst) of Wilmington, Massachusetts, GEI
Consultants, Inc. (GEI) prepared this Class B-1 Response Action Outcome Partial (RAO-P)
Statement for 2-4 Alston Street, Somerville, Massachusetts (the Property), which is a portion
of the 50 Tufts Street site (the Site; Fig. 1). The Site is identified by Massachusetts
Department of Environmental Protection (MassDEP) Release Tracking Number (RTN)
3-23246. A Site Map that shows the Property in relation to the Site boundary is presented in
Fig. 2. This document provides closure for a portion of the Site under the Massachusetts
Contingency Plan (MCP; 310 CMR 40.0000) and indicates that a condition of No Significant
Risk (NSR) exists at the Property.
A release of chlorinated volatile organic compounds (VOCs) to soil and groundwater at the
Site was first reported to the MassDEP in 2002. Subsequent investigations at the Site
identified chlorinated VOCs, particularly tetrachloroethylene (also called perchloroethylene
[PCE]), in indoor air at 50 Tufts Street, and in groundwater and indoor air at residential and
commercial properties in the vicinity of 50 Tufts Street.
There is no groundwater monitoring well located at the Property. However, based on the
concentration of chlorinated VOCs detected in shallow groundwater in a monitoring well
located approximately 50 feet north of the Property, the concentration of PCE in shallow
groundwater at the Property is anticipated to be less than the laboratory reporting limit of
1 microgram per liter. The Property is located within the Site solely due to its location near
low concentrations of groundwater contamination in the overburden.
Based on the following lines of evidence, GEI concludes that the vapor intrusion pathway is
incomplete at the Property:
■ Residual or connected phase dense non-aqueous phase liquid has not been detected at
or near the Property.
■ Chlorinated VOCs have not been detected in soil above laboratory reporting limits
near the Property.
■ The Property is located upgradient from the release at 50 Tufts Street, and the
chlorinated VOCs previously detected in shallow groundwater samples collected near
the Property (MW105) are less than the MCP Method 1 GW-2 standards.
■ Chlorinated VOCs were not detected above laboratory reporting limits in indoor air
samples collected from the basement and first floor of the building on the Property.
GEi Consultants, Inc. iv
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