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(k ry Sequoia 680 Chesapeake Dnv< Redwood City CA 94063 (650) 364 9600 FAX(650)364 9133 ,!:i) 404 N Wtget Lane Walnut Creek CA 94548 (510) 998 9600 FAX(510)986 9673 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)911 0100 EMCON Client Project ID Arco 548, Stockton, CA Sampled Feb 13 1998 1433 N Market Blvd Sample Matrix Soil Received Feb 13, 1998 Sacramento, CA 95834 Analysis Method EPA 5030/8020, DHS Luft Reported Feb 24, 1998 Attention Mark Capps First Sample# 802-0348 TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION Sample Sample Sample Sample Sample Sample Analyte Units Results Results Results Results Results Results mg/kg 802-0348 802-0349 802-0350 802-0351 802-0352 802-0353 PL-10 PL-11 PL-12 PL 13 PL 14 PL 15 (3 1/2 FT) (4 FT) (4 FT) (4 FT) (4 FT) (3 112 FT) Purgeable 12 N D N D N D N D N D Hydrocarbons Reporting Limit 20 10 1 0 10 1 0 10 Benzene 0 030 N D N D N D N D N D Reporting Limit 0 010 00050 00050 00050 00050 00050 Toluene 047 N D N D N D N D N D Reporting Limit 0 010 00050 00050 00050 00050 00050 Ethyl Benzene 025 N D N D N D N D N D 0 Reporting Limit 0 010 00050 00050 00050 00050 00050 Total Xylenes 1 5 N D N D N D N D 00053 Reporting Limit 0 010 00050 00050 00050 00050 00050 Chromatogram Weathered - Pattern Gasoline C6 C12 Quality Control Data Date Analyzed 02/17/98 02/17/98 02/17/98 02/17/98 02/17/98 02/17/98 Instrument Identification GCHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP-1 Surrogate recovery % 101 92 92 92 92 89 (OC Limits = 60 140%) Purgeable Hydrocarbons are quantitated against a fresh gasoline standard Analytes reported as N D were not detected at or above the reporting limit UOIA ANALYTICAL, ELAP71624 h Ronald W Bobel Project Manager/Sacramento Laboratory 8020348 EMC <1>