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` ( \ 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 /> fr�ll� Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> EMCON Client Project ID ARCO 2168, Stockton, CA Sampled Feb 9 1998 <br /> 1433 N Market Blvd Sample Matrix Water Received Feb 10, 1998 <br /> Sacramento, CA 95834 Analysis Method EPA 5030/8020, DHS Luft Reported Feb 19, 1998 <br /> Attention Dave Foley First Sample# 802-0194 <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 /> ,ug/L 802-0194 802-0195 802-0196 802-0197 802-0198 802-0199 <br /> MW 1 (54) MW-2(53') MW-3(54) MW 4 (59) MW 5 (55) MW-6 (43) <br /> Purgeable 20,000 15,000 32,000 17,000 4,700 62,000 <br /> Hydrocarbons Reporting Limit 10,000 5,000 10000 5,000 250 10,000 <br /> Benzene 6,800 3,700 9,700 5,200 740 12,000 <br /> Reporting Limit 100 50 100 50 25 100 <br /> Toluene 360 790 510 540 520 7,000 <br /> Reporting Limit 100 50 100 50 25 100 <br /> Ethyl Benzene 700 440 2,000 690 110 1,300 <br /> 0 Reporting Limit 100 50 100 50 25 100 <br /> Total Xylenes 1,100 1,000 2,700 730 520 7,400 <br /> Reporting Limit 100 50 100 50 25 100 <br /> Chromatogram Weathered Weathered Weathered Weathered Gasoline Gasoline <br /> Pattern Gasoline Gasoline Gasoline Gasoline C6-C12 C6-C12 <br /> ce-C10 C6-1310 C6-C10 C6-1310 <br /> Quality Control Data <br /> Date Analyzed 02/17/98 02/17/98 02/17/98 02/17/98 02/18/98 02/17/98 <br /> Instrument Identification GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Surrogate Recovery, % 91 103 98 101 125 102 <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 /> S OIA ANALYTICAL, FLAP 01624 <br /> '717— -'41 '� <br /> Ronald W Bobel <br /> Project Manager/Sacramento Laboratory <br /> 8020194 EMC c 1> <br />