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f ■ ' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4 15) 364 9600 FAX (415) 364 9233 <br /> 4D <br /> 4 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(514)686 9689 <br /> Analytical 819 Strokcr Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> GeoStrategies Inc Client Project ID Unocal 6389, 4707 Pacific Ave , Stockton <br /> 3035 Prospect Park Dr, Suite 80 Matrix Soil <br /> Rancho Cordova, CA 95670 <br /> Attention Stephen J Carter QC Sample Goup 4071223-1225 Reported Aug 10, 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 Chapman <br /> Concentration <br /> Spiked. 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS080494 LCS080494 LCS080494 LCS080494 <br /> Date Prepared 8/4/94 8/4/94 8/4/94 8/4/94 <br /> Date Analyzed 8/4/94 8/4/94 8/4/94 8/4/94 <br /> Instrument I D # HP-1 HP 1 HP-1 HP-1 <br />. LCS <br /> Recovery 115 111 114 111 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 4071224 4071224 4071224 4071224 <br /> Date Prepared 8/4/94 8/4/94 8/4/94 8/4/94 <br /> Date Analyzed 8/4/94 8/4/94 8/4/94 8/4/94 <br /> Instrument I D # rip-1 HF-1 HP-1 HP 1 <br /> Matrix Spike <br /> % Recovery 110 105 110 110 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 110 110 110 112 <br /> Relative % <br /> Difference 00 47 00 1 8 <br /> EQUOIA 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 /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Jen ie Higgins and are not used to accept or reject batch results <br /> Project Manager 4071223 GSI <2> <br /> 45 <br />