Memorandum GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERS 2269 Massachusetts Avenue Cambridge, Massachusetts 02140 (617) 868-1420 Page 1 of 1 Date: September 2, 2020 Recipient: Town of Arlington HMFH Architects, Inc. Attention: Ms. Lori Cowles Sender: William J. Burns, L.S.P. Project: Arlington High School, Arlington (Project site) Project No: 6531.9.T18 Subject: Summary of Dust Monitoring (June 3 through August 31, 2020) In order to prevent exposures to the general public, on-site monitoring of dust levels in the ambient air during construction has been performed by McPhail Associates, LLC. The environmental monitoring is being performed in accordance with the Release Abatement Measure (RAM) Plan that was prepared for the project site and submitted to the DEP on June 2, 2020. The RAM Plan has established levels for dust at which mitigation measures will be necessary to prevent off-site exposure risks. The action level for dust that has been established for the project site is 0.15 mg/m 3 sustained over a 15-minute duration. From June 3 through August 21, 2020, the monitoring for airborne dust particulates was performed utilizing two pod mounted Aeroqual Dust Sentry dust monitors that were installed along the perimeter of the site. The dust monitors were situated at the eastern and western portions of the site perimeter located within the work area. A plan showing the approximate locations of each dust monitor is enclosed with this memorandum. In general, the results of dust monitoring did not indicate concentrations of airborne dust particulates in excess of the action level established in the RAM Plan. However, on August 8 th and 12 th , two isolated exceedances of the action level were recorded which were considered attributable to equipment working in close proximity to the dust monitor located along the western perimeter of the project site. Each exceedance was followed by dust level measurements that were below the above referenced action level. Charts which depict the results of each 15-minute dust measurement from both Aeroqual Dust Sentry dust monitors are enclosed with this memorandum. N:\Working Documents\Jobs\6531 - Arlington High\Dust Monitoring\6531_AHS-Dust Mont. Memo No.1_090120.docx WJB
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Memorandum
GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERS
2269 Massachusetts Avenue
Cambridge, Massachusetts 02140
(617) 868-1420
Page 1 of 1
Date:
September 2, 2020
Recipient: Town of Arlington
HMFH Architects, Inc. Attention:
Ms. Lori Cowles
Sender: William J. Burns, L.S.P.
Project: Arlington High School, Arlington (Project site)
Project No: 6531.9.T18
Subject:
Summary of Dust Monitoring
(June 3 through August 31, 2020)
In order to prevent exposures to the general public, on-site monitoring of dust levels in the
ambient air during construction has been performed by McPhail Associates, LLC. The
environmental monitoring is being performed in accordance with the Release Abatement
Measure (RAM) Plan that was prepared for the project site and submitted to the DEP on
June 2, 2020. The RAM Plan has established levels for dust at which mitigation measures
will be necessary to prevent off-site exposure risks. The action level for dust that has been
established for the project site is 0.15 mg/m3 sustained over a 15-minute duration.
From June 3 through August 21, 2020, the monitoring for airborne dust particulates was
performed utilizing two pod mounted Aeroqual Dust Sentry dust monitors that were
installed along the perimeter of the site. The dust monitors were situated at the eastern
and western portions of the site perimeter located within the work area. A plan showing the
approximate locations of each dust monitor is enclosed with this memorandum.
In general, the results of dust monitoring did not indicate concentrations of airborne dust
particulates in excess of the action level established in the RAM Plan. However, on August
8th and 12th, two isolated exceedances of the action level were recorded which were
considered attributable to equipment working in close proximity to the dust monitor located
along the western perimeter of the project site. Each exceedance was followed by dust
level measurements that were below the above referenced action level. Charts which depict
the results of each 15-minute dust measurement from both Aeroqual Dust Sentry dust