Monthly remedial monitoring report no. 7A : Capuano Center and Residences : 50 Tufts Street site Somerville, MA / submitted to: UniFirst Corporation ; submitted by: GEI Consultants, Inc

2007·5.1 MB·English

by  GEI Consultants.

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SOMERVILLE PUBLIC LIBRARY
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GEI
Consultants
November 9, 2007
Project 04516-2
Geotechnical Ms, Irene M. Dale 3C .3^3
Environmental and
Environmental Engineer
Water Resources
Bureau of Waste Site Cleanup
Engineering
Massachusetts Department of Environmental Protection
RECEIVED
205B Lowell Street
Wilmington, MA 01887
NOV 1 3 2007
Dear Ms. Dale:
Re: Monthly Remedial Monitoring Report No. 7A DEP
Capuano Center and Residences NORTHEAST REGIONAL OFFICE
50 Tufts Street Site
Somerville, MA
RTN 3-23246 (eDEP Transaction #155240)
On behalf of UniFirst Corporation (UniFirst) of Wilmington, Massachusetts, GEI Consultants, Inc.
is submitting this Remedial Monitoring Report (RMR) No, 7A for the Exposure Pathway
Elimination Measures (EPEM) associated with 50 Tufts Street in Somerville, Massachusetts (Site),
Figure 1. The Massachusetts Department of Environmental Protection (DEP) assigned Release
Tracking Number (RTN) 3-23246 to the Site.
RMR No. 7A covers the monitoring period from October 1 to October 31, 2007. This RMR was
prepared to meet the requirements of the Massachusetts Contingency Plan (MCP) (310 CMR
40.0000). The original Immediate Response Action (IRA) Transmittal Forms (BWSC105,
BWSC105A, and BWSC105B) were submitted by eDEP, and copies were provided in Attachment
A. BWSC105 has been completed to reflect current and historic immediate response actions
performed at the Site to date.
This RMR addresses EPEMs at the following locations (refer to Figure 2):
■ The sub-slab depressurization system (SSDS) installed in January 2007 at the Michael E.
Capuano Early Childhood Center (Center) located at 150 Glen Street.
■ SSDSs installed from May through October 2007 at residential or commercial buildings at;
23 Tufts Street, 31-33 Knowlton Street, 95 Franklin Street, 95R Franklin Street, 18 Morton
Street, and 103 Washington Street.
1. OPERATING STATUS OF ACTIVE REMEDIAL SYSTEM [310 CMR
40.0027(2)(A)1
RMR No. 7A describes monitoring associated with: (i) the Center SSDS; and (ii) the
residential/commercial SSDSs.
1.1. Capuano Early Childhood Center
The Center SSDS was designed by GEI and installed by the T. Ford Company of Georgetown,
Massachusetts. The system consists of pipes cormected to a blower to draw vapors from beneath
www.geiconsultants.com GEI Consultants, Inc.
400 Unicorn Park Drive, Woburn, MA 01801
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Ms. Irene M. Dale -2- November 9, 2007
the building and discharge them through an exhaust pipe above the roof. All of the piping except
the exhaust pipe is underground. The slotted pipes were installed beneath six classrooms along the
southern side of the Center (Classrooms 122, 126, 134, 138, 142 and 146). The blower is currently
located in a small temporary enclosure on the southern side of the instruction wing. Six sub-slab
soil gas monitoring points were installed inside in the bathrooms of Classrooms 122, 126, 133, 137,
142 and 146. Figure 3 is the Center site plan. The Center SSDS has operated without significant
interruption during the monitoring period.
1.2. Residences and Commercial Buildings
The residential/commercial SSDSs were specified by GEI and installed by Storch Radon Services
of Fall River, Massachusetts and Norfolk Services, Inc. of Bridgewater, Massachusetts. The
systems consist of pipes connected to a blower to draw vapors from beneath the building and
discharge them through an exhaust pipe above the roof. The residential/commercial systems’
blowers are located on the exterior of the building to prevent draft effects.
SSDSs cire located at the following residences and commercial buildings; 23 Tufts Street, 31-33
Knowlton Street, 95 Franklin Street, 95R Franklin Street, 18 Morton Street, and 103 Washington
Street.
2. DATE AND NUMBER OF MONITORING EVENTS [310 CMR 40.0027(2)(B)]
2.1. Capuano Early Childhood Center
2.1.1. Operations Monitoring
During the monitoring period, GEI conducted four monitoring events at the Center. The dates and
types of monitoring events for the Center are shown in Table 1. Weekly inspection logs for the
Center are included in Attachment B. Total VOC concentrations measured at the Center from
October 1 to October 31, 2007 are summarized in Table 2 and graphs are presented in Attachment
C.
2.1.2. Indoor Air Monitoring
On October 8 cind 14, 2007, GEI monitored indoor air concentrations at the Center. Indoor air
samples were collected in Classrooms 122, 126,134,138, 142 and 146. The monitoring results to
date for the Center are summarized in Table 3. Laboratory data reports are included in Attachment
D. On October 14, 2007 the mechanical system was adjusted to put the building under negative
pressure to create a “worst case” operating condition. At the conclusion of the tests the building
was put back into its normal operating cycle.
A duplicate air sample was collected in Room 138 during each monthly indoor air sampling event
at the Capuano Center. Each set of duplicate air samples was created by using a “T-splitter” and
tubing attached to two canisters so that both canisters were drawing air from the same sample port.
For the duplicate samples collected in Classroom 138 on September 10, 2007, the laboratory did
not detect PCE above laboratory reporting limits in one sample; however, 6.5 micrograms per
cubic meter (pg/m^) of PCE were measured in the duplicate sample. PCE was not reported above
laboratory reporting limits in Classroom 138, or any of the other classrooms, in any other monthly
sampling event conducted between Febru2iry and September 30, 2007. After extensive discussion
and evaluation, GEI and the laboratory agree that the detection of PCE only in the duplicate sample
was an anomaly.
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Ms. Irene M. Dale -3- November 9, 2007
GEI conducted a rigorous sampling program in Classroom 138 in October 2007 to determine if that
earlier result was in fact an anomaly. We collected a set of four replicate samples (two sets of
duplicates) in Classroom 138 during the October 8, 2007 sampling event. One sample and its
duplicate were collected in Classroom 138 using a stainless steel “T splitter” attached to two
sample collection canisters. This ensured that both canisters were drawing air from the identical
location with no separation of sampling ports. The second sample and its duplicate were collected
by placing two sample collection canisters side by side. The laboratory did not detect PCE above
the laboratory reporting limits in three of the four samples from the classroom. In the duplicate
sample collected with the “T splitter”, 1.5 )J.g/m3 of PCE was detected. The level of 1.5 |J.g/m3 is
right at the limit of what can be reliably quantified by the analytical laboratory. An additional set of
two pairs of duplicate samples (four total) were collected in Room 138 during the October 14, 2007
sampling event, which was conducted after the building was put under negative pressure. PCE was
not detected in any of the four samples collected in Room 138 on October 14.
2.2. Residences and Commercial Buildings
There were no monitoring events between October 1 and October 31, 2007 at the residential or
commercial buildings documented in this RMR No. 7A.
3. EFFLUENT CONCENTRATIONS [310 CMR 40.0027(2)(C)]
3.1. Capuano Early Childhood Center
The Center’s SSDS influent and effluent total VOC concentrations during the monitoring period
are summarized in Table 2.
3.2. Residences and Commercial Buildings
GEI collected an SSDS effluent sample for TO-15 analysis from 95R Franklin on October 29,
2007. Other residential and commercial building effluent concentrations were not monitored during
this reporting period. GEI has not received the analytical data and will report the results in the
November RMR #8a.
4. IDENTIFICATION OF DISCHARGES ABOVE PERMISSIBLE DISCHARGE
CONCENTRATIONS [310 CMR 40.0027(2)(D)]
The regulatory requirements for off-gas treatment for remedial air emissions are presented in
DEP’s Policy No. WSC-94-150, “Off-Gas Treatment of Point-Source Remedial Air Emissions.”
The DEP policy states that off-gas contaminant treatment is not required for SSDSs that produce a
total air emission rate of volatile contaminants of less than 100 pounds per year (Ibs/yr). GEI
calculated the total VOC air emission rates for the mitigation systems, which were presented in
previous RMRs submitted to DEP.
4.1. Capuano Early Childhood Center
It is our opinion that the total VOC air emission rates of the SSDS at the Center does not exceed
the criteria of 100 Ibs/yr and therefore, does not require off-gas treatment.
4.2. Residences and Commercial Buildings
Total VOC air emission rates were calculated at individual buildings, in accordance with
procedures confirmed by DEP. The total VOC air emission rates of each individual SSDS installed
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Ms. Irene M. Dale -4- November 9, 2007
at residences and the commercial building does not exceed the criteria of 100 Ibs/yr and therefore,
does not require off-gas treatment.
5. RECOVERY RATES AND/OR VOLUMES [310 CMR 40.0027(2)(E)]
There is no vapor, liquid or solid recovery associated with the operation of the EPEMs.
6. DISCHARGE VOLUMES [310 CMR 40.0027(2)(F)]
The volume of effluent discharged is not calculated as part of the operation of these EPEMs.
7. DATE, LOCATION, TYPE AND VOLUME OF REMEDIAL ADDITIVES
APPLICATIONS [310 CMR 40.0027(2)(G)]
No remedial additives have been applied as part of these EPEMs.
8. GROUNDWATER DATA [310 CMR 40.0027(2)(H)1
No groundwater data has been collected as part of these EPEMs.
9. RELATED MAPS, GRAPHS OR DIAGRAMS [310 CMR 40.0027(2)(I)]
Related tables, maps and inspection logs are included as attachments and referenced in this report.
Please contact me at [phone] or at [email protected] if you have any
questions regarding this RMR No. 7A.
Very truly yours,
GEI CONSULTANTS, INC.
ISG:jah
c: John Badey, UniFirst Corporation
Peter Mills, City of Somerville
Attachments:
Table 1: Summary of Monitoring Events - Capuano Center
Table 2: PID Monitoring Data - Capuano Center
Table 3: Summary of Testing Results - Indoor Air Samples - Capuano Center
Figure 1: Site Location Map
Figure 2: 50 Tufts Street Site
Figure 3: Capuano Center Site Plan
Attachment A: BWSC105, BWSC105A and BWSC105B
Attachment B: Weekly Mechanical Inspection Logs for Capuano Center
Attachment C: Graphs of SSDS and Sub-Slab Total VOC Concentrations
Attachment D: Laboratory Data Reports
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