EXH AR034841: Cars Are Leading Source of Metal Loads in California

Notes

Technical Note #13 from Watershed Protection Techniques 1(1):28, summarizing a Santa Clara Valley Nonpoint Source Program study on metal pathways into the Lower San Francisco Bay. Cars and vehicles found to produce over 50% of total loads of copper, cadmium, and zinc; brake pad wear alone accounts for 50% of total copper load; tire wear accounts for at least half of total cadmium and zinc loads. Atmospheric deposition is primary loading pathway for lead, with diesel exhaust as chief culprit. Metals studied include cadmium, chromium, copper, lead, mercury, and zinc. Source: Santa Clara Valley Nonpoint Source Control Program, 1992 ‘Source Identification and Control Report,’ Woodward Clyde Consultants. Exhibit 2232, AR 034841.

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