This webinar, presented by Bob Namar of TSI in partnership with RAECO Rents, provides an in-depth look at South Coast Air Quality Management District (SCAQMD) Rule 1466. This rule is critical for managing fugitive dust emissions at cleanup sites containing toxic contaminants.
Understanding Rule 1466 & Its Scope [04:03]
Rule 1466 was established to minimize off-site fugitive dust containing toxic air contaminants during earth-moving activities.
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Jurisdiction: Applies specifically to the South Coast AQMD region, including Orange County and portions of Los Angeles, San Bernardino, and Riverside counties [04:17].
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Triggers: The rule applies to sites designated by agencies like the US EPA, DTSC, or State Water Boards due to contaminated soil [05:30].
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Goal: To protect surrounding communities from toxic particulate emissions without unnecessarily impeding construction and remediation work [06:32].
Core Monitoring Requirements [07:51]
Compliance requires strict adherence to PM10 monitoring protocols:
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Upwind and Downwind Setup: At least two monitors must be placed on opposite corners of the site, positioned based on prevailing wind direction to measure site-specific dust contribution [08:05].
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The 25 µg/m³ Limit: If the differential (the difference between downwind and upwind readings) exceeds 25 micrograms per cubic meter, dust suppression measures must be taken [25:22].
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120-Minute Rolling Average: Recent amendments updated the standard from a fixed two-hour block to a 120-minute rolling average, allowing for more flexible work starts [16:17].
Equipment Specifications for Compliance [12:11]
The South Coast AQMD sets minimum standards for the hardware used in these studies:
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Heated Inlet: Required to manage moisture and humidity, which can otherwise be misread by the sensor as dust particles [12:29].
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Data Logging & Telemetry: Monitors must be capable of logging data points (average concentration, time, date) and ideally offer remote monitoring via telemetry [13:14].
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TSI DustTrak Models: The DustTrak 8530 (PM10 only) and 8533 (DRX - multi-fraction) are pre-approved for Rule 1466 compliance [20:11].
Recordkeeping & Reporting [10:01]
Proper documentation is essential for passing inspections:
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Signage: Sites must have legible signs with project manager contact info so the community can report dust issues [10:08].
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Data Storage: All logs and rolling average data must be maintained for at least three years [10:35].
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Exceedance Logs: You must document when an exceedance occurred, what suppression measures (like watering) were taken, and when levels returned to baseline [34:39].