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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 ez) cal 404 of Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 M-West Client Project ID 653 30 / Santa Fe / Stockton 5 Capitol Mall, 8th Flr Matrix Water Sacramento, CA 95814 Attention Laurie Deples OC Sample Group 5091060-1063 Reported Oct 4, 1995 QUALITY CONTROL. DATA REPORT ANALYTE Ethyl- Benzene Toluene Benzene Xylenes Diesel Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M Analyst C Lee C Lee C Lee C Lee C Lee Concentration Spiked 10 ug/L 10 ug/L 10 pg/L 30 Y9/L 300,ug/L LCS Batch# LCS092795 LCS092795 LCS092795 LCS092795 LCS092695 Date Prepared 9/27/95 9/27/95 9/27/95 9/27/95 9/26/95 Date Analyzed 9/27/95 9/27/95 9/27/95 9/27/95 9/29/95 Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-3B LCS % oRecovery 106 105 105 105 83 Control Limits 75-125 75-125 75-125 75-125 60-130 MS/MSD Batch # 5090701 5090701 5090701 5090701 BS092695 Date Prepared 9/27/95 9/27/95 9/27/95 9/27/95 9/26/95 Date Analyzed 9/27/95 9/27/95 9/27/95 9/27/95 9/29/95 Instrument I D # GCHP-2 GCHP-2 GCHP 2 GCHP-2 GCHP-3B Matrix Spike % Recovery 101 99 100 100 83 Matrix Spike Duplicate % Recovery 100 97 100 99 93 Relative % Difference 10 31 00 10 11 SEQUOIA ANALYTICAL Please Note / The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, I// in'da / � preparation and analytical methods employed for the samples The LCS%recovery data is used for [ Lvalidation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only C Schneider and are not used to accept or reject batch results Project Manager 5091060 ERS <5>