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South Coast AQMD and Rule 1466

Monitor Air Contaminants from Toxic Soil Emissions

Rule 1466

South Coast AQMD-Approved Particulate Monitors

TSI assisted the South Coast Air Quality Management District (South Coast AQMD) in the evaluation of sensor technology and helped establish the minimum monitor requirements set forth in Appendix 1 of Rule 1466. The evaluation was performed in conjunction with California Department of Toxic Substances Control (DTSC), who provides regulatory oversight for many of the remediation contamination sites in the state. TSI was one of the first two companies to be accepted to the list of  SCAQMD pre-approved monitors. We offer the most options accepted among any manufacturer to meet each site’s specific needs.

Am I Required to Monitor Particulates at My Remediation Site?

Under South Coast AQMD's Rule 1466, the owner/operator at any remediation site that is deemed contaminated by certain toxics must conduct continuous direct-reading, near real-time, ambient particulate monitoring at upwind and downwind remediation contamination site locations. The monitors must measure concentrations of PM10 (10 microns or less) and the site contribution of PM10 (upwind values subtracted from downwind values) must not exceed 25 ug/m3 averaged over 2 hours. If an exceedance occurs, the site owner/operator must cease all earth-moving activities until additional dust control measures are employed.

Dust monitoring solutions from TSI offer time-saving differential calculations between upwind and downwind values.

Comply with Rule 1466 in Three Easy Steps

  1. PM10 Monitoring
    Using two monitors, log real-time measurements for PM10, wind speed and wind direction. Monitors must be positions in opposite corners of the site near the property line. One upwind and one downwind.
  2. Dust Control
    Minimize fugitive dust emissions with proper controls. Use dust suppressants such as wetting and install fencing that is at least 6’ tall. Clean the soil from all vehicles leaving the site; do not allow track-out to extend beyond 25’ of the property line.
  3. Notifications
    Notify SCAQMD at least 72 hours prior to earth-moving activities and when an exceedance occurs. Install appropriate SCAQMD signage around the project perimeter. Log readings and project data, then maintain accurate records for at least 3 years.

Hardware and Software Requirements:

TSI monitors have already been evaluated and are in compliance with Rule 1466

  • Hardware Requirements:
    • PM10 monitors must be capable of logging data every 1 minute (down from 10 min)
    • PM10 monitors must have a heated inlet
  • Software Requirements:
    • PM10 site contribution must be calculated as a 2-hour rolling average (previously was 2 hourlies on the hour)
    • Upwind & downwind monitors are designated based on real-time wind direction (previously just prevailing wind)


TSI Instruments Approved By South Coast AQMD

TSI has worked with SCAQMD for many years, and has DustTrak™ Aerosol Monitors on the pre-approved list of instruments for Rule 1466. TSI has made it easy to order with four different packages:

Dedicated Environmental Packages:

  • (8540-1466): PM10 Only - DustTrak™ Environmental Monitor, Heated Inlet, and PM10 Impactor Kit
  • (8543-1466): PM10 plus PM1, 2.5, 4 and total PM - DustTrak™ DRX Environmental Monitor and Heated Inlet

Multi-Use Packages:

  • (8530-1466): PM10 Only - DustTrak™ II Aerosol Monitor, Weatherproof Pelican case enclosure, and Heated Inlet with Autozero Module
  • (8533-1466): PM10 plus PM1, 2.5, 4 and total PM  - DustTrak™ DRX Aerosol Monitor, Weatherproof Pelican case enclosure, and Heated Inlet with Autozero Module

To learn more about TSI's packages, download the flyer

A full list of Rule 1466 Executive Officer Pre-Approved PM10 Monitors can be viewed here.

The wide offering of the DustTrak family allows you to choose the perfect configuration to assist in compliance with Rule 1466, as well as for future air quality monitoring projects to maximize on your investment.

Weather Stations and Data Collection

TSI also offers weather stations for determining upwind and downwind locations which is part of the requirements for South Coast AQMD's Rule 1466.  Additionally, TSI's cloud solution has been customized to meet the needs of Rule 1466, and has the capability to automatically calculate the difference between upwind and downwind monitors as the rule states, sending alerts if the difference exceeds 25 ug/m3. This eliminates a significant amount of work and time. TSI also offers local app communication and standard direct connect downloading to a laptop. Data collection and usage is plug-and-play as well. The DustTrak monitors and optional sensors will start reporting to the cloud immediately when powered on or plugged in, for a truly remote monitoring solution that can be viewed from a smartphone or computer anywhere, anytime

TSI also offers other plug-and-play air quality monitoring solutions to compliment the DustTrak monitors, such as gas detection sensors with PID for VOC’s and power options, such as solar panel solutions and batteries. All of these solutions can be easily set up as they are designed to work together. Additionally, TSI’s direct technical staff will assist with field set up and staff training. Made in the USA, there are no power conversion issues or SIM card issues for data delivery associated with foreign providers.