Air and Dust Monitoring Summary Report

Transcription

1 Toronto Transit Commission Air and Dust Monitoring Summary Report Monitoring Period: 1 February 28 February 2014 Air quality monitoring is currently ongoing as part of the dust control program associated with the Leslie Street Connection Track construction project. The objective of the dust control program is to protect the community from potential impacts of the construction dust on air quality. The monitoring program was developed to confirm the effectiveness of the dust control program in protecting the community. When assessing potential dust impacts from construction activities, it is the inhalable particulate (PM 10 ), with particle sizes of less than 10 μm, that is generally considered to be the most appropriate size fraction to monitor. PM 10 is commonly associated with the handling of aggregates and soils, wind erosion, road dust, and construction activities, and the provincial criterion is set based upon the potential health effects of PM 10. The larger particulates, with diameter of up to a size of 44 μm, are considered total suspended particulate (TSP), and the AAQC for TSP is based upon potential effects on visibility since airborne TSP is generally considered to be a nuisance. In Ontario, the objective is to maintain total PM 10 levels below the interim Ambient Air Quality Criterion (AAQC) of 50 micrograms per cubic metre (µg/m 3 ) over a 24-hour period. This AAQC is not a standard, but rather a concentration target for PM 10 that is considered to be protective of human health and the environment. PM 10 levels are currently being continuously monitored at three stations along Leslie Street using DustTrak TM DRX instruments. The monitoring stations were sited along the perimeter of the construction activities, rather than in the community, to allow the contractor to effectively use the PM 10 data to monitor dust levels and to employ additional dust control measures if shortterm PM 10 concentrations are elevated. The average PM 10 concentration is recorded every 30-minutes, and the 48 daily readings are used to calculate 24-hour average concentrations that are shown in the summary table. The daily concentrations are provided as an indicator of dust levels near the construction, but are not directly comparable to the AAQC. A summary of the results of this continuous monitoring is provided in the Dust Monitoring Summary (page 3). As of February 2014, TTC is operating an E-Sampler PM10 dust monitor identified as CM2 on Leslie Street just south of Queen Street. The average PM10 concentration is recorded every 15-minutes, and the 96 daily readings are used to calculate 24-hour average concentrations that are provided in the dust monitoring summary table. Page 1 of 6

2 Toronto Transit Commission Air and Dust Monitoring Summary Report Monitoring Period: 1 February 28 February 2014 In addition to the continuous PM10 monitors used to provide feedback to the site, the TTC has been operating a community monitoring station on the rooftop of 843 Eastern Avenue since This station would be more indicative of community air quality impacts. The 24-hour average PM 10 concentration is measured once every six days at this station. Airborne TSP is also monitored at the community monitoring station, as well as a number of metals that may be present as constituents of the particulate matter. These sampling results are summarized in the Air Quality Summary (page 4). A windrose and graph of the monthly precipitation are also provided (page 5). The windrose presents the monthly wind data graphically, where the colours denote the wind speed and the length of each spoke corresponds to the frequency that the wind blows from a given direction as a percent of the total hours in each month. Page 2 of 6

3 Dust Monitoring Summary Report Toronto Transit Commission Dust (PM 10 ) Monitoring at Three Stations (Dust 2, Dust 3, Dust 6, and CM2) Monitoring Period: 1 Feb - 28 Feb 2014 PM 10 : Particulate Matter, less than 10 micrometres in diameter. µg/m 3 : Micrograms per cubic metre; a unit of measure for concentration in air. Date 24 Hour Average PM 10 Concentration Minimum Maximum (µg/m 3 ) (µg/m 3 ) Station(s) Where 24-hour Average > 50 µg/m 3* Predominant Wind Direction(s) Comments 01-Feb SSW, WNW Station 2 exceeded the 24-hr project limit 02-Feb Feb Feb Feb Feb Feb Feb NNW Station 2 exceeded the 24-hr project limit 09-Feb E, SE Station 2 exceeded the 24-hr project limit 10-Feb Feb Feb Feb Feb ,3,6 E, NE All stations exceeded 24-hr project limit 15-Feb-14** Data unavailable 16-Feb Feb Feb Feb ,3,6 NE, SSW All stations exceeded 24-hr project limit 20-Feb Data invalid due to instrument error 21-Feb Feb Feb Feb Feb Feb Station 2 data was valid; Stations 3 and 6 data was invalid due to instrument error. 27-Feb NE Station 2 exceeded the 24-hr project limit 28-Feb * 50 µg/m is the interim Ontario Ministry of the Environment Ambient Air Quality Criteria (AAQC) for PM 10. **February 15 th PM 10 data was not available at the time this Summary was issued. Wind direction is reported by the direction from which it orginates. Data was collected at four (4) monitoring stations, three (3) stations equipped with DustTrak aerosol monitors and one (1) E-Sampler that measure airborne PM 10. Three (3) of the monitors are located along the perimeter of the excavation area for the purpose of monitoring on-site dust levels. One (1) monitor identified as CM2 is located south of Queen Street on Leslie Street for the purpose of community dust monitoring. TT93749 Page 3 of 6

4 Air Quality Monitoring Summary Report Toronto Transit Commission Ambient Air Quality Sampling at Community Monitoring Station Monitoring Period: February 2014 The air quality sampling results for fine particulate matter (PM 10 ) and metals presented were collected at the community monitoring station in February Sampling was conducted on a standard 6-day schedule. All concentrations are 24- hour average values. Fine Particulate Matter PM 10 and Total Suspended Particulate (TSP) PM 10 TSP Number of Samples 5 5 February 2014 Summary Average Concentration µg/m Maximum Concentration µg/m Minimum Concentration µg/m Number of Days greater than Project Limit 0 0 Baseline Concentration (2011) µg/m Established Project Limit* µg/m PM 10 : Particulate Matter less than 10 micron in diameter Metals The metals concentrations were determined from analysis of the total particulate matter samples collected. Arsenic Cadmium Chromium Lead Manganese Nickel Number of Samples February 2014 Summary Average Concentration µg/m 3 <0.003 < Maximum Concentration µg/m 3 <0.004 < Minimum Concentration µg/m 3 <0.003 < Number of days greater than Project Limit Baseline Concentration (2011) µg/m Project Limit µg/m *Established Project limits are based on the criteria submitted in the Ambient Air Monitoring Plan approved by the MOE. TT93749 Page 4 of 6

5 Air Quality Monitoring Summary Report Toronto Transit Commission February 2014 Meteorological Data Summary WRPLOT View - Lakes Environmental Software Figure Monthly Wind Rose: February 2014 (Source: On-Site Meteor orological Station ) Total Preciptation (mm) Figure Monthly Precipitation: February 2014 (Source: On-Site Meteorological Station) TT94739 Page 5 of 6

6 QUEEN STREET EAST RUSHBROOKE AVENUE EASTERN AVENUE LESLIE STREET MOSLEY STREET LAKE SHORE BOULEVARD EAST NOTES: NORTH SERVICE ROAD 1. THE LOCATION OF EACH MONITORING STATIONS INDICATED ON THE PLAN MAY BE SUBJECT TO CHANGE IN ORDER TO ENSURE THAT THE STATIONS MEET THE ONTARIO MINISTRY OF THE ENVIRONMENT SITING CRITERIA FOR AN AMBIENT AIR MONITORING STATION AND ARE NOT OBSTRUCTED BY TREES OR OTHER SITE FEATURES. 2. THE COMMUNITY MONITORING STATION (CM) IS OPERATED BY AMEC, AND THE DUST MONITORING STATIONS ARE OPERATED BY SPL (STATIONS 2,3 AND 6). STATION m SCALE CLIENT LOGO CLIENT: TORONTO TRANSIT COMMISSION AMEC Environment & Infrastructure 3190 Steeles Avenue East, Unit #305, Markham, Ontario L3R 1G9 DRAWN BY: ZF DESIGNED BY: LL CHECKED BY: REVIEWED BY: SL SCALE: AS SHOWN PROJECT TITLE ASHBRIDGES BAY LRV MAINTENANCE AND STORAGE FACILITY LESLIE STREET CONNECTION TRACK DUST AND AMBIENT AIR MONITORING STATIONS LAKE SHORE BOULEVARD EAST & LESLIE STREET, TORONTO, ONTARIO DATE: MARCH 2014 PROJECT NO: TT TT93749 REV. NO.: FIGURE No. A 2