Item 3b Guadalupe River Monitoring WY 2010 Jen Hunt, Ben Greenfield, Sarah Lowe, Lester McKee Sources, Pathway, and Loading Work Group May 6th, 2010

Guadalupe River WY 2010 Mercury monitoring funded by the Santa Clara Valley Water District for 2 locations on the Guadalupe River Monitoring to assess progress towards attaining legacy and urban stormwater runoff mass load allocations for the TMDL PCB, PFC, and Dioxin monitoring funded by the RMP

Item 3b Why Guadalupe? Known source of Hg to the Bay Previous POC (Hg, PCB, PBDE) monitoring at GR 101 High loadings of both PCBs and mercury detected in previous studies Identified as a Status Monitoring Location in the MRP USGS discharge station USGS/SCVWD/SFEI collaboration.

Item 3b STLS Informational Needs Impairment: Which are the “high- leverage” small tributaries that contribute most to Bay impairment by pollutants of concern? Loads: Determining average annual loads or concentrations of pollutants of concern from small tributaries to the Bay. Provide data for modeling efforts.

Item 3b Guadalupe River Watershed Precipitation Gages

Item 3b San Jose Precipitation Year Average =14.37

Item 3b Mount Umunhum Precipitation Year Average = 48.56

Item 3b October 13 th Storm

Item 3b Mercury Sample Collection Samples for Mercury analysis collected from October 8, 2009 to April 28, THg (50 samples at 2 sites) 50 DHg, TMeHg, DMeHg (25 samples at 2 sites)

Item 3b PCB Sample Collection Samples for PCB analysis collected from October 8, 2009 to February Samples (20 samples at 2 Sites)

Item 3b Dioxin Sample Collection Samples for Dioxin analysis collected from October 8, 2009 to February Samples (14 samples at GR101 and 6 samples at GRFOX)

Item 3b Preliminary Mercury Data

Item 3b Preliminary PCB Data