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.l <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> (D 404 N Wiget Lane Walnut Creek CA 9459$ (510) 988 9600 FAX(510)988 9673 <br /> q1W Analytical $19 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 0 <br /> EMCON Client Project ID ARCO 548, Stockton, CA Sampled Feb 10, 1998 <br /> 1433 N Market Blvd Sample Matrix Soil Received Feb 11, 1998 <br /> Sacramento, CA 95834 Analysis Method EPA 5030/8020 Modified Reported Mar 9, 1998 <br /> Attention Mark Capps First Sample # 802-0243 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results Results Results <br /> mg/kg 802-0243 802-0244 802-0245 802-0246 802-0247 802-0248 <br /> SP 1 1A/113 SP-1-2A/26 SP 1-3A/3B SP-1-4A/48 SP-1-5A/58 SP-2A/2B <br /> Composite Composite Composite Composite Composite Composite <br /> MTBE ND 046 ND ND 094 ND <br /> Reporting Limit 0 25* 0 050 0 25* 0 25* 025 0 050 <br /> i <br /> Quality Control Data <br /> Date Analyzed 02/12/98 02/12/98 02/12/98 02/12/98 02/12/98 02/12/98 <br /> Instrument Identification GCHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Surrogate Recovery, % 94 97 96 97 98 96 <br /> (QC Limits = 60-140%) <br /> *Reporting limit raised due to matrix interference <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 /> "UOIA ANALYTICAL, ELAP #16 <br /> Ronald W Bobel <br /> Project Manager/Sacramento Laboratory <br /> 8020243 EMC <2> <br />