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i!D Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> " 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> woAnalytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 40 <br /> kleinfelder Client project Ib 20-3941-01 1=01 <br /> 2825 East Myrtle St Matrix Sall <br /> Stockton, CA 95205 <br /> Attention Tony Martin QC Sample Group 6060919-1001 Reported Jul 10, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst B Williams B Williams B Williams B Williams <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS062696 LCS062696 LCS062696 LCS062696 <br /> Date Prepared 06/26/96 06/26/96 06/26/96 06/26/96 <br /> Date Analyzed 06/26/96 06/26/96 06/26/96 06/26/96 <br /> Instrument I ❑ # GCHP 1 GCHP-1 GCHP 1 GCHP-1 <br /> LCS % <br /> Recovery 96 102 104 105 <br /> Control Limits 75-125 75 125 75 125 75-125 <br /> MS/MSD <br /> Batch # 6060929 6060929 6060929 6060929 <br /> Date Prepared 06/26/96 06/26/96 06/26/96 06/26/96 <br /> Date Analyzed 06/26/96 06/26/96 06/26/96 06/26/96 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP 1 <br /> Matrix Spike <br /> Recovery 84 88 89 92 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 89 92 95 97 <br /> Relative% <br /> Difference 58 44 65 53 <br /> EQUOIA ANALYTICA Please Note <br /> 7 The LCS is a control sample of known,interferent free matrix that Is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> �� ��1 validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labora ory <br /> 6060973 KLF <11> <br />