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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 hates Avenue,Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Strategies Inc Client Project ID Unocal 7827 03 <br /> 3035 Prospect Park Dr, Suite 80 Matrix Sol] <br /> Rancho Cordova, CA 95670 <br /> Attention Steve Carter QC Sample Group 407-0360 Reported Jul 14, 1994 <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 C Chapman C Chapman C Chapman C Chapmdfr <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCSG71394 LCS071394 LCS071394 LC6071394 <br /> Date Prepared 7/13/94 7/13/94 7/13/94 7/13/94 <br /> Date Analyzed 7/13/94 7/13/94 7/13/94 7/13/94 <br /> Instrument I.D # HP-1 HP-1 HP-1 HP-1 <br /> • LCS % <br /> Recovery 100 100 100 97 <br /> Control Limits. 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 4070032 4070032 4070032 4070032 <br /> Date Prepared 7/13/94 7/13/94 7/13/94 7/13/94 <br /> Date Analyzed 7/13/94 7/13/94 7/13/94 7/13/94 <br /> Instrument I D # HP-1 HP-1 HP-1 HP-1 <br /> Matrix Spike <br /> % Recovery 90 85 9D 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 105 95 98 97 <br /> Relative % <br /> Difference 15 11 5 4 75 <br /> QUOTA ANALYTICAL Please Note <br /> 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 is used for <br /> CA C` validation of sample batch results Due to matrix effects,the QC limits for MS/MSD s are advisory only <br /> Craig C Lie 1 and are not used to accept or reject batch results <br /> Project Manager <br /> 4070360 GSI <2> <br />