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,Ci Sequoia 680 Chesapeake Drive Rcdwood City, CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> filler Analytical 1111,tcs Avcnue,Suite L Concord,CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> 819 Stnkcr Avcnuc Sultc 8 Sacramcnto CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> *Strategies Inc Client Project ID Unocal 7827 03 <br /> { 3035 Prospect Park Drive, Suite 80 Matrix Soil <br /> J Sacramento, CA 95670 <br /> `Attention Steve Carter QC Sample Group 407036OA-382A Reported Jul 29, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 <br /> Analyst C Chapman C Chapman C Chapman C Chapman D Ballard <br /> Concentration <br /> Spiked- 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 50 mg/kg <br /> LCS Batch# LCS072294 LCS072294 LCS072294 LCS072294 LCS072094 <br /> Date Prepared 7/22/94 7/22/94 7/22/94 7/22/94 7/20/94 <br /> Date Analyzed 7/22/94 7/22/94 7/22/94 7/22/94 7/21/94 <br /> Instrument LD # HP-1 HP-1 HP-1 HP-1 PE-40 <br /> 0LCS % <br /> Recovery 100 100 100 100 93 <br /> Control Limits 75-125 75-125 75-125 75-125 80-120 <br /> MS/MSD <br /> Batch # 4070559 4070559 4070559 4070559 4070563 <br /> Date Prepared 7/22/94 7/22/94 7/22/94 7/22/94 7/20/94 <br /> Date Analyzed. 7/22/94 7/22/94 7/22/94 7/22/94 7/21/94 <br /> Instrument I D # HP-1 HP-1 HP-1 HP-1 PE-40 <br /> Matrix Spike <br /> % Recovery. 110 110 110 107 85 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 95 90 90 93 68 <br /> Relative % <br /> Difference 15 20 20 14 22 <br /> ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> IQUOIA <br /> p 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/MiSD's are advisory only <br /> Craig C Lee �`" � and are not used to accept or reject batch results <br /> Project Manager C , <br /> 4070360AGSI <4> <br />