Concentrations and Loads of Mercury, Pcbs, and OC Pesticides in the Lower Guadalupe River, San Jose, California: Water Years 2003 and 2004
San Francisco Estuary Institute Regional Watershed Program Concentrations and Loads of Mercury, PCBs, and OC Pesticides in the Lower Guadalupe River, San Jose, California: Water Years 2003 and 2004. Lester McKee Jon Leatherbarrow John Oram SFEI Contribution 409 July 2005 S an Francisco Estuary Institute McKee, Leatherbarrow, and Oram, 2005 CONCENTRATIONS AND LOADS OF MERCURY, PCBs, AND OC PESTICIDES IN THE LOWER GUADALUPE RIVER, SAN JOSE, CALIFORNIA: WATER YEARS 2003 AND 2004. Lester McKee, Jon Leatherbarrow, and John Oram San Francisco Estuary Institute SFEI Contribution 409 July 2005 i McKee, Leatherbarrow, and Oram, 2005 This report can be cited as: McKee, L., Leatherbarrow, J., and Oram, J., 2005. Concentrations and loads of mercury, PCBs, and OC pesticides in the lower Guadalupe River, San Jose, California: Water Years 2003 and 2004. A Technical Report of the Regional Watershed Program: SFEI Contribution 409. San Francisco Estuary Institute, Oakland, CA. 72pp. ii McKee, Leatherbarrow, and Oram, 2005 EXECUTIVE SUMMARY This report summarizes and interprets mercury, trace elements, PCBs and OC pesticides concentration data collected in Guadalupe River water during the winter seasons of water years 2003 and 2004. Our objective is to describe concentration variability between years and to determine loads. We will present some hypotheses on the processes of mercury source, release, and transport and the source, release, and transport processes of other trace elements and the organic contaminants. We estimate total mercury loads, loads of other total trace elements, loads of PCBs and OC pesticides entering San Francisco Bay under the range of climatic conditions encountered. In addition, we use a simple rating curve method to estimate a five-year average mercury loads and a probable maximum mercury load based upon observed rainfall intensity and runoff data from water year 1975 – 2004.
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