Permanente Creek Selenium TMDL
Permanente Creek is located in Santa Clara County. It flows through a variety of land use areas, including forest, industry, open space, highly developed urban areas, and discharges to the Lower South Bay via Mountain View Slough (Figure 1). Over time, Permanente Creek has undergone significant modification, including being channelized to provide flood control functions. The Diversion Channel near Berry Avenue in Mountain View diverts most of the winter flows to the adjacent Stevens Creek.
Available data and information suggests that discharges from Lehigh Permanente Quarry located in the upper watershed contribute most of the selenium in Permanente Creek. The Water Board has required Lehigh to conduct numerous studies to characterize the quality of its process/stormwater/groundwater and that of the creek to further evaluate selenium loads and degree of impairment. This information will be used by the Water Board to develop a TMDL to address the impairment.
The following photos show the quarry operation and the physical condition of Permanente Creek within the TMDL project area.
Permanente Creek before the Diversion Channel
(Near Berry Ave in Mountain View)
Permanente Creek Near Crittenden Middle School,
Mountain View (Bottom of Watershed)
Staff Technical Reports (coming soon)
U.S. EPA Selenium Criteria
For more information contact:
Tong Yin, Ph.D., P.E.
Water Resource Control Engineer
San Francisco Bay Regional Water Quality Control Board
1515 Clay Street, Suite 1400
Oakland, CA 94612