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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> 404 N Wlget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell 81vd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Prol ID Stockton Fire#2 62574 0001/02 Sampled 09/22/98 <br /> 1260 Graphics Drive Sample Descript MW-1 Received 09/25/98 <br /> Modesto, CA 9535 1-1 502 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 09/29/98 <br /> Attention Jeanne Homsey Lab Number 9809G80-01 Reported 10JO7198 <br /> QC Batch Number GC092998BTEX03A <br /> Instrument ID GCHP03 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 250 820 <br /> Methyl t-Butyl Ether 12 46 <br /> Benzene 2 5 160 <br /> Toluene 2 5 4 9 <br /> Ethyl Benzene 25 N D <br /> Xylenes (Total) 2 5 44 <br /> Chromatogram Pattern <br /> Gas& Unidentified HC C6-C12 <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 88 <br /> 0 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 41210 <br /> Project Manager Page 2 <br />