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1 ' Sequoia 885 Jarvis Drive <br /> Morgan Hill CA 95037 <br /> (408) 776-9300 <br /> Analytical <br /> FAX(408) 782-6308 <br /> ATC Associates,Inc -Modesto Project Stockton Fire Station#2 Sampled 7/6/99 <br /> 1117 Lone Palm Avenue Project Number #5462574 0001 Received 718/99 <br /> Modesto,CA 95351-1502 Project Manager Jeanne Homsey Reported 7/20/99 <br /> Total Purgeable Hydrocarbons(C6-C12)'BTEX an'd MTBE by DHS LUF"T/QualityControl - --- <br /> Sequoia <br /> _Sequoia Analytical-Morgan Hill <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> [Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 9070491 Date Prepared 7/15/99 Extraction Method EPA 5030B IP/Tl <br /> Blank 9070491-BLKI <br /> Purgeable Hydrocarbons 7/15/99 ND ug/l 500 <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tert-butyl ether ND __ 2 50 <br /> Surrogate a,a a-Trifluorotoluene 100 Y 933 700-130 93 3— <br /> LCS 9070491-BS1 <br /> Purgeable Hydrocarbons 7/15/99 250 266 ug/l 700-130 106 <br /> Surrogate a s a-Trzfluorotoluene 11100 130 rF 700-130 130 <br /> rix S ike 9070491-MS1 M907214-03 <br /> geable Hydrocarbons _ 7115/99 250 ND 292 ug/l 600-140 117 _ <br /> Surrogate a a a-Trzfluorotoluene PI100 140 700-130 140 5 <br /> Matrix Spike Dup 9070491-MSD1 M907214-03 <br /> Purgeable Hydrocarbons 7/15/99 250 _ ND_ 283 ug/l _ 60 0-140 113 _ 25 0 3 48 <br /> Surrogate a,a,a-Trzfluorotoluene 100 13 6 � 700-130 136 5 <br /> Batch 9070545 Date Prepared 7/16/99 Extraction Method EPA 5030B [P/Tl <br /> Blank 9070545-BLKI <br /> Purgeable Hydrocarbons 7/16/99 ND ug/l 500 <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tert-butyl ether ND 250 <br /> Surrogate a,a,a-Trzfluorotoluene 1190 106 700-130 106 <br /> LCS 9070545-BSI <br /> Benzene 7/16199 100 896 ug/l 700-130 89 6 <br /> Toluene 100 9 16 700-130 91 6 <br /> Ethylbenzene 100 938 700-130 93 8 <br /> Xylenes(total) _ 300 _ 282 _ 700-130 94 0_ <br /> Surrogate a a a-Triuorotoluene 100 972 700-130 97 2 <br /> Matrix Spike 9070545-MSI M907294-01 <br /> Benzene 7/16/99 100 ND 9 00 ug/l 600-140 900 <br /> Dene 10 0 ND 9 22 600-140 922 <br /> Sequoia Analytical-Morgan Hill *Refer to end of report for text of notes and definitions <br /> Page 5 of 9 <br />