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AECOM 3 <br /> Table 2: Brake Grindings STLC Results <br /> Analyte Stockton VMF STLC <br /> Results(mg/L) Criteria <br /> (mg/L) <br /> Antimony 0.60 15 <br /> Arsenic 0.20 U 5.0 <br /> Barium 5.5 100 <br /> Beryllium 0.050 U 0.75 <br /> Cadmium 0.13 1.0 <br /> Chromium 6.4 5.0 <br /> Cobalt 0.10 U 80 <br /> Copper 0.030 U 25 <br /> Lead 0.10 U 5.0 <br /> Mercury 0.0020 U 0.2 <br /> Molybdenum 0.092 J 350 <br /> Nickel 0.10 U 20 <br /> Selenium 0.20 U 1.0 <br /> Silver 0.10 U 5.0 <br /> Thallium 0.20 U 7.0 <br /> Vanadium 0.21 24 <br /> Zinc 2.0 250 <br /> BOLD exceeds criteria <br /> J estimated <br /> U not detected above reporting limit shown <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Analytical results for the sample collected from the Stockton VMF indicated that the waste stream <br /> is classified as California hazardous waste due to slight chromium exceedance of STLC criteria,and <br /> cannot be treated as scrap metal due to the presence of fine particles smaller than 0.004 inches. <br /> It is recommended that the Stockton VMF manage brake grindings as California(a.k.a. non-RCRA) <br /> hazardous waste. <br /> AECOM personnel observed airborne particles of fine dust when the cover was removed from the <br /> drum during sampling of the brake grindings. It is recommended that the USPS perform an <br /> assessment of the potential hazard associated with airborne dust caused by the brake grinding <br /> process. <br /> If you have any comments or questions regarding this report, please feel free to contact me at(858) <br /> 300-2703. We appreciate the opportunity to provide these services for the USPS and look forward <br /> to working with you in the future. <br /> Sincerely, <br /> AECOM, Inc. <br /> - � A/la,&, <br /> Leta Maclean,CHMM <br />