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Sequoia 680 Chesapeake Dnve Redwood Csty CA 94063 (415) 364 9600 FAX(415) 364-9233 404 N Wiget lane Walnut Creck CA 94598 (510) 998 %00 FAX(510)988 9673 Analytical - 819 StnkerAvenuc Susie 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0[00 . Brown & Caldwell Client Project ID Arca 02133, Stockton CA Sampled Mar 19, 1997 9616 Micron Ave , Suite 600 Sample Matrix Water Received Mar 20, 1997 Sacramento, CA 95827 Analysis Method EPA 5030/8020, DHS Luft Reported Apr 1, 1997 Attention Steve Misner First Sample # 703-0665 TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION Sample Sample Sample Sample Sample Sample Analyte Units Results Results Results Results Results Results Mg/L 703-0665 703-0666 703-0667 703-0668 703-0669 703-0670 MW-1 E-6 MW 5 6HD-1 E-3 E4 A Purgeable N D N D 1400 , 2,300 4,400 1,600 Hydrocarbons Reporting Umit 50 so 50 1 000 200 500 Benzene 051 N D 26 , 54 46 120 Reporting Umit 050 050 050 10 20 50 Toluene N D N D _ 56 N D 62 84 _ Reporting Limit 050 050 050 10 20 50 Ethyl Benzene N D N D _ 46 190 46 38 Reporting Limit 050 050 050 10 20 50 • Total Xylenes N D N D 98 100 99 N D Reporting Limit 050 050 050 10 20 50 Chromatogram - Weathered Weathered Weathered Weathered Pattern Gasoline Gasoline Gasoline Gasoline C6-C12 C6 C12 C6-C12 C6-C12 Quality Control Data Date Analyzed 03/24/97 03/24/97 03/24/97 03/24/97 03/27/97 03/24/97 Instrument Identification GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-2 GCHP-7 Surrogate Recovery, % 82 95 89 74 93 (QC Limits = 60-140%) Purgeable Hydrocarbons are quantitated against a fresh gasoline standard Anafyies reported as N D were not detected at or above the reporting limit *Matrix interference SEQUOIA ANALYTICAL, FLAP #1624 ODA^101 M t~12t,�A-10 Edana M Fruciano Project Manager/Sacramento Laboratory 7030653 BRS <3>