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11 <br /> l7 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 96W FAX(916)921 0100 <br /> EMCON Client Project ID ARCO 2168, Stockton, CA Sampled Nov 17, 1997 <br /> 1433 N Market Blvd Sample Matrix Water Received Nov 18, 1997 <br /> Sacramento, CA 95834 Analysis Method EPA 5030/8020, DHS Luft Reported Dec 4, 1997 <br /> Attention Deanna Santos First Sample # 711-0993 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Sample Sample Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results Results Results <br /> erg/L 711-0993 711-0994 711-0995 711-0996 711-0997 711-0998 <br /> MW-1 (54) MW-2(53) MW-3(54) MW-4 (59) MW-5(55) MW-6(41) <br /> Purgeable 23,000 2,200 37,000 12,000 10,000 42,000 <br /> Hydrocarbons Reporting Limit 10 000 1 000 10 000 10 000 5 000 20 000 <br /> Benzene 9,300 510 12,000 4,800 1,700 5,400 <br /> Reporting Limit 100 10 100 100 50 200 <br /> Toluene 580 120 2,100 180 1,300 2,100 <br /> Reporting Limit 100 10 100 100 50 200 <br /> Ethyl Benzene 820 44 2,100 370 210 1,100 <br /> • Reporting Limit 100 10 100 100 50 200 <br /> Total Xylenes 1,300 130 3,000 280 1,100 6,600 <br /> Reporting Limit 100 10 100 100 50 200 <br /> Chromatogram Gasoline Gasoline Gasoline Gasoline Gasoline Gasoline <br /> Pattern C6-C12 C6-C12 C6-C12 C6-C12 C6 C12 C6-C12 <br /> Quality Control Data <br /> Date Analyzed 11/24/97 11/25/97 11/24/97 11/24/97 11/26/97 11/25/97 <br /> Instrument Identification GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Surrogate Recovery, % 113 117 100 97 92 98 <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 />/,'EQ) QIIA ANALYTIC ELAP #1624 <br /> C Schneider <br /> Manager/Sacramento Laboratory <br /> 7110993 EMC <1 r <br />