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' Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 4T)l Analytical 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 919 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 SMCN A vA.:..:.....v..........v.......:.::..........:. U ssoclates 1433 N. Market Blvd. 1 fi Stoclifon ' Matrix: Soil Sacramento, CA 95834 Attention: Claudio Avila OC ..:: Sample Group 5081509-1516 Reported: Se 7, 1995:: QUALITY CONTROL DATA REPORT ANALYTE Ethyl- Benzene Toluene Benzene Xylenes Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 Analyst: C.Chapman C.Chapman C.Chapman C.Chapman Concentration Spiked: 0.20 mg/kg 0.20 m9/kg 0.20 mg/kg 0.60 mg/kg ' LCS Batch#: LCS090695 LCS090695 LCS090695 LCS090695 Date Prepared: 9/6/95 9/6/95 9/6/95 9/6/95 Date Analyzed: 9/6/95 9/6/95 9/6/95 9/6/95 Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 LCS % Recovery: 99 80 80 so Control Limits: 75-125 75-125 75-125 75-125 X. ' MS/MSD Batch#: 13LK090695 BLK090695 BLK090695 BLKD90695 ' Date Prepared: 9/6/95 9/6/95 9/6/95 9/6/95 Date Analyzed: 9/6/95 9/6/95 9/6/95 9/6/95 Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 ' Matrix Spike %Recovery: 75 78 77 so ' Matrix Spike Duplicate% Recovery: 83 84 84 85 ' Relative% Difference: 8.8 7.4 8.7 6.1 SEQ OIA ANALYTICAL ease Note: The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, C/ ? preparation and analytical methods employed for the samples. The LCS%recovery data is used for validation of sample batch results. Due to matrix effects,the QC limits for MS/MSG's are advisory only Linda C. Schneider and are not used to accept or reject batch results. Project Manager 5081509.EMC <6>