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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 404 N Wtget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue Scute 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> EMCON Client Project ID AIRCO 2168, Stockton, CA Sampled Jan 20, 1998 <br /> 1433 N Market Blvd Sample Matrix Air Received Jan 21, 1998 <br /> Sacramento, CA 95834 Analysis Method EPA 5030/8020, DHS Luft Reported Feb 11, 1998 <br />- Attention MattTurner First Sample # 801-0664 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Sample Sample <br /> Analyte Units Results Results <br /> mg/m3 801-0664 801-0665 <br /> Influent Effluent <br /> Purgeable 4,900 110 <br /> Hydrocarbons Reporting omit 500 10 <br /> Benzene 89 089 <br /> Reporting Limit 25 0 050 <br /> Toluene 34 032 <br /> Reporting Limit 25 0 050 <br /> Ethyl Benzene 52 0 052 <br /> Reporting Limit 25 0 050 <br /> Total Xylenes 40 <br /> v a 10 <br /> Reporting Limit 25 0 050 <br /> Chromatogram Weathered Weathered <br /> Pattern Gasoline Gasoline <br /> C6-C12 C6-C12 <br /> Quality Control Data <br /> Date Analyzed 01/22/98 01/22/98 <br /> Instrument Identification GCHP-2 GCHP-2 <br /> Surrogate Recovery, % 90 88 <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 /> SF OIA ANALYTICAL, E P #1624 <br /> Ronald W Bobel <br /> Project Manager/Sacramento Laboratory <br /> 8010664 EMC <2> <br />