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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 1900 Bates Avenue Suite L Concord,CA 94520 (510) 686 9600 FAX(510)686 9689 Analytical 819 Stnker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 ' Roy F Weston Client Project 1D San Joaquin County MVCD 2300 Clayton Rd , Suite 1580 Matrix Water Concord, CA 94520 Attention Dave Marks OC Sample Goup 5030908-911 Reported Mar 31, 1995 1 OUALITY 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 ug/L 30 ug/L 300 ug/L LCS Batch# LCS033095 LCS033095 LCS033095 LGS033095 LCS032895 Date Prepared 3/30/95 3/30/95 3/30/95 3/30/95 3/28/95 Date Analyzed 3/30/95 3/30/95 3/30/95 3/30/95 3/29/95 Instrument 1.11) # GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-3B LCS Recovery. 95 95 95 95 77 ' Control Limits: 75-125 75-125 75-125 75-125 60-130 ' MS/MSD Batch # 5030905 5030905 5030905 5030905 BLK032895 ' Date Prepared: 3/30/95 3/30/95 3/30/95 3/30/95 3/28/95 Date Analyzed 3/30/95 3/30/95 3/30/95 3/30/95 3/29/95 Instrument I D.# GCHP-2 GCrIP-2 GCHP-2 GCHP-2 GCHP-38 ' Matrix Spike %Recovery 92 90 96 94 77 ' Matrix Spike Duplicate% Recovery 93 93 93 92 87 ' Relative% Difference. 1 1 33 32 22 12 SEQUOIA ANALYTICAL Please Note The LCS Is a control sample of known,interferent free matrix that is analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS%recovery data Is used for lG �C•� validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only / Linda C Schneider and are not used to accept or reject batch results / Project Manager 5030908 ROY t 3>