Proposed Amended Rule 1157 – PM10 Emission Reductions from Aggregate and Related Operations

Rule 1157 regulates aggregate and related operations to reduce emissions of particulate matter with an aerodynamic diameter of 10 microns or less (PM10). Proposed Amended Rule 1157 (PAR 1157) will further reduce PM10 emissions from aggregate and related operations by: 1) expanding the applicability to include construction and demolition debris transfer stations; 2) specifying frequencies for when the application of dust control/suppressants or chemical stabilizers are required; 3) adding new compliance pathway for conducting periodic inspections of open storage piles in lieu of prescribed dust suppressant application frequencies; 4) adding enhanced recordkeeping requirements; 5) adding new requirements to standardize signage for applicable facilities; 6) expanding requirements that are triggered by recurring violations; and 7) removing obsolete requirements. Implementation of PAR 1157 will require installation of new signage for all applicable facilities and may require the installation of rumble grates and gravel pads at some facilities. Implementing additional requirements applicable to aggregate and related operations to reduce PM10 emissions and address community concerns will improve compliance which will benefit public health and ambient air quality.