Class B-1 response action outcome partial statement for 13-15 Franklin Avenue, Somerville, Massachusetts : 50 Tufts Street Site, Somerville, Massachusetts / submitted to UniFirst Corporation ; submitted by GEI Consultants

2011·3.9 MB·English

by  GEI Consultants.

Consultants
Geotechnical
Environmental
Water Resources
Ecological
MassDEP RTN 3-23246
Class B-1 Response Action Outcome
Partial Statement for 13-15 Franklin
Avenue, Somerville, Massachusetts
50 Tufts Street Site, Somerville, Massachusetts
Submitted to:
UniFirst Corporation
68 Jons pin Road
Wilmington, MA 01887
Submitted by:
GEI Consultants, Inc.
400 Unicom Park Drive
Woburn, MA 01801
781-721-4000
June 29, 2011
REF
354.
353
Project 04516-3
, GEI
Tl^n S. Gladstone, P.E., ESP, LEED AP
Vice President

MassDEP RTN 3-23246
Class B-1 Response Action Outcome Partial Statement
for 13-15 Franklin Avenue, Somerville, Massachusetts
50 Tufts Street Site, Somerville, Massachusetts
UniFirst Corporation
June 29, 2011
Table of Contents
Executive Summat7 iv
1. Introduction 1
1.1 Purpose 1
1.2 Scope 1
1.3 Submittals 2
1.4 Public Record 2
1.5 Contact Information 2
1.6 Conceptual Site Model 2
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 Soil Vapor 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
• •
GEI Consultants, Inc.
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MassDEP RTN 3-23246
Class B-1 Response Action Outcome Partial Statement
for 13-15 Franklin Avenue, Somerville, Massachusetts
50 Tufts Street Site, Somerville, Massachusetts
UniFirst Corporation
June 29, 2011
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 - Soil Vapor
4. Exposure Point Concentrations - Groundwater
Figures
1. Site Location Map
2. 13-15 Franklin Avenue - Portion of the Site Subject to the Class B-1 RAO
Appendices
A. Copy of MassDEP Form BWSC-104 “Response Action Outcome Transmittal Form”
B. Public Notification Documentation
JDR/MCE/ISG:csh
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MassDEP RTN 3-23246
Class B-1 Response Action Outcome Partial Statement
for 13-15 Franklin Avenue, Somerville, Massachusetts
50 Tufts Street Site, Somerville, Massachusetts
UniFirst Corporation
June 29, 2011
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 13-15 Franklin Avenue, 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 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.
Based on an extrapolation of the concentration of chlorinated VOCs in shallow groundwater
monitoring wells, and the shallow groundwater concentrations exhibited in the monitoring
well located approximately 40 feet from the Property, the concentration of
tetrachloroethylene (also called perchloroethylene [PCE]) in shallow groundwater at the
Property is estimated to be less than the laboratory reporting limit of 1 microgram per liter
(pg/1). The Property is located within the Site solely due to its location over low
concentrations of groundwater contamination in the deep overburden and bedrock.
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 (DNAPL) has not been
detected at or near the Property.
■ Chlorinated VOCs have not been detected in soil above laboratory reporting limits
near the Property.
■ Chlorinated VOCs have not been detected in shallow groundwater samples collected
near the property (MW121S) above the laboratory reporting limit.
■ Chlorinated VOCs measured in the soil vapor at MW121S were less than
10 micrograms per cubic meter (pg/m ). Ten pg/m is a conservative screening value
that MassDEP provided and approved for use at this Site in the Immediate Response
Action (IRA) Plan Modification Conditional Approval letter, dated June 19, 2007.
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MassDEP RTN 3-23246
Class B-1 Response Action Outcome Partial Statement
for 13-15 Franklin Avenue, Somerville, Massachusetts
50 Tufts Street Site, Somerville, Massachusetts
UniFirst Corporation
June 29, 2011
Detections of VOCs at concentrations below the threshold screening value of
10 |ag/m indicate that there is not a complete vapor intrusion pathway at the Property,
and no additional action is required to address that pathway.
■ Chlorinated VOCs have not been detected above laboratory reporting limits in indoor
air samples collected from nearby buildings.
A Class B-1 RAO-P Statement is appropriate for the Property based on the following;
■ Remedial actions were not conducted and a Permanent Solution has been achieved.
■ A condition of NSR to human health, safety, public welfare, and the environment
exists for all receptors.
■ An Activity and Use Limitation (AUL) is not required to maintain a condition of
NSR.
■ Oil or hazardous material (OHM) at the Property does not exceed an applicable
Upper Concentration Limit (UCL) in soil or groundwater.
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