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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 404N.Wlget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 1455 McDowell Blvd.North,Ste.D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 :.:::::......... ... .. settler-Ryan- Duhl ri Client Project IIS: Tosco 76#11195, Lathrop Sampled. Jan 1'5, 1999 6747 Sierra Court, Suite J Sample Matrix: Soil Received: Jan 15, 1999-,- Dublin, CA 94568 Analysis Method: EPA 5030/8015 Mad./8020 Reported: Jan 21, 1999> Attention: Doug Lee First Sample#: 901-0988 TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX / MTBE Reporting Sample Sample Sample Sample Sample Analyte Limit I.D. I.D. I.D. I.D. I.D. mg/Kg 901-0988 901-0989 901-0990 901-0991 901-0992 ST-16 ST-17 ST-18 ST-19 ST-20 Purgeable Hydrocarbons 1.0 3.6 110 130 32 90 Benzene 0.0050 0.015 N.D. 0.056 0.097 0.27 Toluene 0-0050 0.042 N.D. 0.42 0.29 0.39 Ethyl Benzene 0.0050 0.040 N.D. N.D. 0.38 N.D. Total Xylenes 0.0050 0.23 N.D. N.D. 1.8 N.D. MTBE 0.050 0.46 N.D. N.D. 0.86 N.D. Chromatogram Pattern: Gasoline& Gasoline& Gasoline& Gasoline& Gasoline Unidentified Unidentified Unidentified Unidentified Hydrearbons Hydrearbons Hydrearbons Hydrearbons C6-C12 >C7 Cs-C12& C6-C12 Quality Control Data >C10 Report Limit Multiplication Factor: 1.0 100 5.0 10 50 Date Analyzed: 1/19/99 1/19/99 1/19/99 1/19/99 1/20/99 Instrument Identification: HP-4 HP-4 HP-4 HP-4 HP-4 Surrogate Recovery, %: 84 * 98 ** (QC Limits = 40-140%) Purgeable Hydrocarbons are quantitated against afresh gasoline standard. Analytes reported as N.D.were not detected above the stated reporting limit. SEQUOIA ANALYTICAL, #1271 Please Note: * Surrogate recovery below control limit due to dilution. ** Surrogate recovery above control limit due to coelution. lianne Fegley Project Manager 9010988.GET <1>