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Sequoia 680 Chesapeake Drive RcdWood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N W;get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> (D— Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95934 (916) 921 96W FAX(916)921 0100 <br /> Grown & Caldwell Client Project 1D ARCO 02133, Stockton CA Sampled Nov 25, 1997 <br /> 9616 Micron Ave Suite 600 Sample Matrix Water Received Nov 26 1997 <br /> Sacramento, CA 95827 Analysis Method EPA 5030/8020 Modified Reported Dec 12 1997 <br /> Attention Steve Misner First Sample # 711-1534 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results Results Results <br /> pg/L 711-1534 711-1535 711-1536 711-1537 711-1538 711-1539 <br /> PR 1 MW-4 E-12 E-11 E 2 E-B <br /> MTBE ND ND ND ND ND ND <br /> Reporting Limit 50 50 50 50 50 50 <br /> Quality Control Data <br /> Date Analyzed 12/04/97 12/04/97 12/04/97 12/04/97 12/04/97 12/04/97 <br /> Instrument Identification GHCP-1 GHCP-1 GHCP-1 GHCP-1 GHCP-1 GHCP-1 <br /> Surrogate Recovery % 98 100 101 101 90 92 <br /> (QC Limits = 60-140%) <br /> Purgeable hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N D were not detected at or above the reporting limit <br /> SEQUOI ANALYTICAL, LAP #1624 <br /> 7Lda Schneider <br /> anager/Sacramento Laboratory <br /> 7111534 BRS <3> <br />