Laserfiche WebLink
Page 1 of 1 <br /> Garrett Backus [EH] <br /> From: Garrett Backus [EH] <br /> Sent: Wednesday, August 11, 2010 1:51 PM <br /> To: Kasey Foley [EH] <br /> Subject: at&t brake shavings HW determination <br /> Attachments: AT&T brake rotor shavings HW determination.pdf; DTSC October 15, 1998 letter- Brake <br /> Rotor metal shavings.pdf <br /> Kasey, <br /> Here's AT&T's brake rotor r ietal shavings HW determination. They found 0.08% < 100 microns metal shavings. <br /> TTLC testing found Chromi m, Copper, Lead, Mercury and Nickel at greater than 10X the STLC limit. STLC <br /> testing found 7.8 mg/I chro ium, 0.95 mg/I nickel, copper ND, mercury ND, lead ND. TCLP for chromium and <br /> STLC for chromium (VI)wee not run. <br /> I've attached the AT&T determination statement. They also reference the attached '98 DTSC letter. <br /> They state the following to explain why the hexavalent chromium STLC test and the TCLP for chromium test are <br /> not necessary: <br /> 1) Brake rotor material will not contain hexavalent chromium due to the "heat of the casting process." <br /> 2) STLC California Waste Extraction Test is "generally more aggressive than TCLP" due to finer sample <br /> milling and stronger extraction solvent. <br /> They state that the analytical results for the 0.08% fraction need to be diluted by the total weight of the brake <br /> shavings to get the correct concentration for the HW determination. The '98 DTSC letter is referenced. <br /> AT&T currently handles the r metal waste including the brake shavings by sending to a recycler in Bakersfield — <br /> Fortune Metal Inc. Receipts were sent to me with the determination. <br /> Garrett Backus <br /> Senior Registered Environmer tal Health Specialist <br /> San Joaquin County Environn ental Health Department <br /> 600 E Main Street, Stockton CA 95202-3029 <br /> telephone: (209)468-2986 <br /> fax: (209)468-3433 <br /> email: gbackus@sjcehd.com <br /> 8/11/2010 <br />