All earth-moving operations at notified remediation sites in California must comply with Rule 1466. 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:

  1. General notifications
  2. Air monitoring
  3. 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.

Three simple steps to comply with SCAQMD Rule 1466 Rule 1466 applies to earth-moving activities of soil with applicable toxic air contaminants. The purpose of the rule is to minimize off-site fugitive dust emissions by establishing air monitoring and dust control measures. Here are three simple steps to comply with Rule 1466. General Notifications Install SCAQMD approved signs along the property line. Notify SCAQMD before commencing activities and when an exceedance occurs. Maintain accurate recordkeeping and reporting. Air Monitoring PM10, plus wind speed and direction must be monitored in real-time. Place a minimum of one upwind and one downwind monitor close to the property line. Choose from the list of Executive Office pre-approved PM10 monitors, such as the Aeroqual Dust Sentry. Dust Control Measures Install 6-foot fencing/windscreen and apply dust suppressant methods, such as wetting and removing any track-out dust from vehicles and tires. Cover and label contaminated stockpiles. PM10 contribution is upwind/downwind difference averaged over 2 hours (report top of each hour) Notify SCAQMD within 72 hours of an exceedance of the PM10 emission limit Cease works if wind gusts exceed 25 mph or wind speeds >15 mph averaged over 15 minutes Contaminated soil stockpiles covered and labelled Water sprinkling (wetting) and suppressants for dust control 6-foot fencing and windscreen. Approved Monitor. Apply dust control measures if pm10 levels exceed 25 µg/m3 averaged over 2 hours.
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1. General Notifications

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
Ray Huff, VP at SCS Engineers , installs a Dust Sentry PM10 monitor at the site boundary
Ray Huff, VP at SCS Engineers , installs a Dust Sentry PM10 monitor at the site boundary

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
dust-control-measures
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.