Rule 1466 compliance & SCAQMD: 3 Simple Steps

Rule 1466 compliance & SCAQMD: 3 Simple Steps

Article Details

Last Updated

11 October 2023


16 April 2019



All earth-moving operations at notified remediation sites in California involve Rule 1466 compliance. It applies to all parts of California regulated by the South Coast Air Quality Management District (SCAQMD). The rule ensures that off-site fugitive dust emissions containing toxic air contaminants are minimized. It came into effect in early 2018. For an overview of Rule 1466, we have compiled “Everything you need to know about SCAQMD Rule 1466” in a previous blog.

There are three simple steps to comply with Rule 1466:

  • General notifications

  • Air monitoring

  • Dust control measures

Download our Rule 1466 Visual Guide

Our visual guide to Rule 1466 compliance, created with input from SCAQMD and LA-based environmental consultants, is now available to download.


1. General notifications

A SCAQMD-approved sign at the entrance of a remediation site in LA

A SCAQMD-approved sign at the entrance of a remediation site in LA

2. Air monitoring

  • Operate, maintain, and calibrate, continuous direct-reading near real-time ambient PM10 monitors, identical in make and model, from the list of Executive Officer pre-approved PM10monitors

  • Place one upwind monitor (minimum) where the location is indicative of background PM10 levels and one downwind monitor (minimum) in the seasonal prevailing wind direction downwind of earth-moving activity and close to the property line

  • Monitor wind direction and speed during earth-moving activities using approved Meteorological Measurements

  • Calculate PM10 concentration averaged over 2 hours, starting at the top of each hour, where PM10 concentration is the absolute difference between upwind and downwind monitors

  • Cease earth-moving activities if the PM10 concentration averaged over 2 hours exceeds 25 µg/m3

  • Apply dust control measures until PM10 concentration is ≤25 µg/m3 averaged over 30 minutes

  • Cease earth-moving activities if wind gusts exceed 25 mph or >15 mph averaged over 15 minutes

  • Use a data acquisition system to collect and record PM10 concentrations

  • Maintain accurate data and instrument records using the Instrument Log and PM10 Monitoring Log

3. Dust control measures

  • Install fencing and windscreen 6-foot tall and at least as high as the tallest stockpile

  • Adequately wet to the depth of earth-moving activity at frequencies to prevent visible dust plumes

  • Stabilize all vehicular traffic surfaces areas with gravel, paving, or dust suppressant

  • Remove any track-out using a vacuum equipped with an approved filter

  • Install vehicle and wheel washing systems to remove soil from tires and vehicles

  • Segregate and label soil stockpiles with applicable toxic air contaminant(s)

  • Apply dust suppressant to stockpiles and chemically stabilize and/or completely cover with approved plastic sheet

  • Apply dust suppressant to material prior to loading and unloading; and remove any spilled soil

  • On-site Dust Control Supervisor who has a valid Certificate of Completion of SCAQMD Fugitive Dust Control Class

A segregated and labelled stockpile at a remediation site in LA

A segregated and labelled stockpile at a remediation site in LA

What Rule 1466 solutions does Aeroqual offer?

Aeroqual’s Dust Sentry PM10 monitor is pre-approved by SCAQMD, ensuring your construction and remediation projects comply with Rule 1466. It seamlessly reports data in the required format and frequency using our integrated software platform.

Track real-time data in line with Rule 1466 and receive automatic alerts sent direct to your wireless device using Aeroqual Site Contribution, our automated remediation monitoring software. Aeroqual Site Contribution features selectable air quality regulations (including Rule 1466 and simplified NY DER-10, with more regulations to follow) that optimize your data for local legislative requirements while ensuring safe, efficient remediation.

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