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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> 1900 Bates 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 /> WStrategies Inc Client Project ID Unocal 0187, 437 E Miner Ave , Stockton <br /> 3035 Prospect Park Dr, Suite 80 Matrix Soil <br /> Rancho Cordova, CA 95670 <br /> Attention Stephen J Carter QC Sample Goup 407-0363 Reported Aug 12, 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# LCS081094 LC8081094 LCS081094 LCS081094 <br /> Date Prepared 8/10/94 8/10/94 8/10/94 8/10/94 <br /> Date Analyzed 8/10/94 8/10/94 8/10/94 8/10/94 <br /> Instrument i D # HP-1 HP-1 HP-11 HP-1 <br /> . LCS <br /> Recovery 120 115 120 113 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> 4 s � vv v • v r +. . +. . . 1� v 1 r4v <br /> MS/MSD <br /> Batch # 4071311 4071311 4071311 4071311 <br /> Date Prepared 8/10/94 8/10/94 8/10/94 8/10/94 <br /> Date Analyzed 8/10/94 8/10/94 8/10/94 8/10/94 <br /> Instrument I D # HP-1 HP-1 HP-1 HP-1 <br /> Matrix Spike <br /> % Recovery' 110 110 110 110 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 120 120 120 115 <br /> Relative % <br /> Difference 87 87 87 44 <br /> QUOIA ANALYTICAL Please Nate <br /> 46 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 CC limits for MS/MSD s are advisory only <br /> Jennie Higgins and are not used to accept or reject batch results <br /> Project Manager <br /> 4070363 GSl <2> <br />