EXH2232034841

02/20/02 09:07 FAX 425 649 7098 DEPT OF ECOLOGY _ AGs OFFICE _008 TechnicalNote#13from WatershedProtectionTechniques.I(I):28 Cars Are Leading Source of MetalLoads inCalifornia etals can follow manypathways before they autprevention strategy that focused on cleauer fuels or become entrained inurban stormwater run reducing vehicle emissions was recommended. off.ArecentCalifomiastudysponsoredby The authors made an attempt to calculate metal the Santa ClaraValley Nonpoint Somv,e Program sug- ioadings f_om leaks ofmotor oil, gasoline, aud coolaut gests that cars are the dominant loading source for leaks from cars, as well as illegal disposal fromoiland many metals of concern, sneh as cadmimn, chromium, coolant changes. The data on leak and illegal disposal copper, lead, mescury, and zinc. rates is _,,i,_ely sketchy. Forexample leakrates of 03, Researchers exnmined the siglfififance of various 0.01,and 1.2%ofallcarswerecitedforgasoline, motor metal pathways into the Low_ San Fnmcisco Bay. oilandcoolant, respectively.Therateofillqaldisposal Specifically, the comparative loadlno potential of five of motor oil Wasestimated to be 15%. urban source areas were studied using a mass balance Basedoutheserates, leaks andillegaldisposalwere approach. The sources were atmospheric deposition, not believed to be a major pathway for metals into automotive leaks and wear, runoff from industrial and stormwater drains (about eight and 2% of the copper residential sites, and water .supply. and zinc load, respectively). Carsand other vehicles were foundto produce over The metal load containedin stormwater nmofffrom 50% ofthe total load ofthree metals: copper, cadmium indmtfial sources could not be calculeted dne to a lack and zinc. This number was generated even without of d_*R.However, the authors ranked the…

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PSCAA Advisory Council Meeting Agenda
Add to CalendarMWednesday Mar 11, 9:00am - 11:35am
1904 3rd Avenue, Suite 105, Seattle, WA 98101
Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]