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American Environmental Testing Laboratory Inc <br /> 2834 North Naorra Street Burbank CA 91504 • DOHS NO 1541 LACSD NO 10181 <br /> Tel (888)288-AETL• (818)845-8200•Fax (818)845-8840 <br /> ANALYTICAL RESULTS <br /> Ordered By Sate <br /> Thrifty Oil Company To <br /> 171 <br /> 13539E Foster Road 1250 N Wilson Way <br /> Santa Fe Springs, CA 90670- Stockton, CA 95205 <br /> Telephone (562)921-3581 <br /> Attn Jeff Suryakusuma <br /> Page g <br /> Project ID #171 AETL Job Number Submitted Claent <br /> Project Name Vapor Sampling 15304 04/19/2000 TOC <br /> Method 8020A/M8015G, Aromatic VOCs Using GC (GtBTEX+MTBE) <br /> QUALITY CONTROL REPORT <br /> QC Batch Number. 04212000/04212000 <br /> MS MS MS MS DUP MS DUP MS DUP RPD MS/ SD MS RPD <br /> Analytes Concen Recov %REC Concen Recov %REC % %Limit % Lima <br /> Benzene 50 0 48 0 96 50 0 46 5 93 3 2 75-125 c20 <br /> Ethylbenzene 50 0 49 5 99 50 0 47 5 95 4 1 75-125 <20 <br /> • Toluene(Methyl benzene) 50 0 49 5 99 50 0 48 0 96 3 1 75-125 c20 <br /> LCS <br /> o-Xylene 50 0 56 0 112 50 0 55 5 111 ci 75-125 c20 <br /> m p-Xylenes 100 0 88 0 88 100 0 84 0 84 4 7 75-125 <20 <br /> QC Batch Number 04212000104212000 <br /> LCS LCS LCS LCSILCS <br /> Analytes Concen Recov %REC %Limit <br /> Benzene 5o 0 48 0 96 75-125 <br /> Ethylbenzene 50 - 46 5 93 75-125 <br /> Toluene(Methyl benzene) 5o 0 48 5 97 75-125 <br /> LCS <br /> o-Xylene 50 0 55 0 110 75-125 <br /> m,p-Xylenes 100 0 84 0 84 75-125 <br />