1/29/2012 12:00:00 AM Daily dust levels remain within safety limit As indicated at left, dust generated at the Garfield Avenue Site on 1/29/2012 12:00:00 AM, did not exceed the dust action level. The level was developed to prevent concentrations of airborne hexavalent chromium from reaching a point requiring additional dust-suppression measures or the suspension of cleanup activities established by the NJDEP in consultation with the independent technical consultant.   Detailed Reports Monitor Locations

Protection of human health is a priority during PPG Industries’ clean-up operations at its 20 chromium sites, including the Garfield Avenue Site. To protect the community, PPG is using proven containment and control measures that have been approved by the New Jersey Department of Environmental Protection following a review by the independent technical consultant.air monitoring stations at the perimeter of the Garfield Avenue Site to ensure safe conditions continue to be maintained during cleanup activities. Some of the monitors are only used while work is taking place but others operate 24 hours a day, seven days a week. Data from these monitors are posted to this website.

Chromium samples are collected and results are compared to the acceptable air concentration limits established by NJDEP specifically for the Garfield Avenue Site. The limit for hexavalent chromium at the Garfield Avenue Site is 49 nanograms per cubic meter of air, which is considered to be protective of human health based on U.S. Environmental Protection Agency assumptions for cancer risk. PPG must meet NJDEP’s acceptable air concentration limit for the duration of the remediation, which is scheduled to last until the fourth quarter of 2014. Monitoring for specific compounds such as chromium requires samples be collected and sent to a lab for analysis.

Dust, meanwhile, can be measured in real time while work is taking place, allowing workers to take immediate action designed to protect community health if needed. As a result, PPG continuously measures dust as a surrogate for hexavalent chrome at eight air monitoring locations. Four of these monitors take measurements 24 hours a day, seven days a week.

The NJDEP-approved air monitoring plan established a limit on total dust of 333 micrograms per cubic meter measured on a 15-minute average basis. This limit was derived based upon hexavalent chromium concentrations at the site. Full-time air monitoring technicians located on site while work is being conducted review these readings to control site operations and implement additional dust-suppression measures as needed to protect the community.