Thursday, February 21, 2013

Air Monitoring Program Continues at Calaveras Dam

If you are traveling on Calaveras Road, you may notice what appears like chain link cages along the side of the road. These are our air quality monitoring stations.  These stations have been placed throughout the valley and within the construction boundaries of the Calaveras Dam Replacement Project.  Our teams collect air sampling data throughout the week at the various stations to ensure we are protecting the public and our workers at all times. 

Why are we doing this?

Portions of the approximately 7 million cubic yards of material which is being moved to construct the replacement Calaveras Dam contain rock formations that contain varying levels of Naturally Occurring Asbestos.

Geotechnical explorations in the area of the Calaveras Dam Replacement Project construction revealed that the Sunol Valley contains rock types that are known to contain naturally occurring asbestos and metals.  Serpentinite rock (“California Jade”) is the state rock of California and occurs naturally in at least 44 of California's 58 counties.


The SFPUC has implemented an extensive air monitoring program that is designed to keep dust generation to a minimum while assuring that asbestos-containing dust does not leave the site at levels sufficient to pose unacceptable risks to individuals who may work, recreate, or reside in the vicinity of the site.

For more information about our air quality monitoring and to see the latest air monitoring results, visit our NOA Website by clicking here.  Our results are updated weekly.

Our Staff collecting samples from an air monitoring station


Meet David from our Calaveras Dam Air Monitoring Team
working at one of our air monitoring stations

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