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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> 5) 1404 N W,get Lane Walnut Creek CA 94598 (510) 988-9600 FAX(510) 988 9673 <br /> %0 Analytica819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> 165ugro West, Inc Client Project ID Shell, 6131 Pac>is Ave, Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Soil <br /> Roseville, CA 95678 <br /> Attention WIII Shipp QC Sample Group 5091368,70,72,75-77,83-84 Reported Oct 10, 1995 <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: V Owens V Owens V Owens V Owens <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch#- LCS100695 LCS100695 LCS100695 LCS100695 <br /> Date Prepared 10/6/95 10/6/95 10/6/95 10/6/95 <br /> Date Analyzed 10/6/95 10/6/95 10/6/95 10/6/95 <br /> Instrument I.D #. GCHP-1 GCHP-t GCHP-1 GCHP-1 <br /> • LCS <br /> Recovery 96 96 97 96 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 5091260 5091260 5091260 5091260 <br /> Date Prepared: 10/8/95 10/6/95 10/6/95 10/6/95 <br /> Date Analyzed 10/6/95 10/6/95 10/6/95 10/6/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery' 84 84 84 88 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery, 88 89 ^^+ 92 <br /> Relative % <br /> Difference 46 58 69 44 <br /> SEQUOIA 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 OC limits for M5/MSDs are advisory only <br /> J Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5091368 FUG <4> <br />