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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> cnviros, Inc Client Project ID Shell, 620 W Charter Way, Stockton, CA <br /> P O Box 259 Matrix Air <br /> Sonoma, CA 95476-0259 <br /> Attention Matt Donohue QC Sample Group 6051499-1500 Reported May 28, 1996 <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 2 0 mg/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCS052096 LCS052096 LCS052096 LCS052096 <br /> Date Prepared: 05/20/96 05/20/96 05/20/96 05/20/96 <br /> Date Analyzed 05/20/96 05/20/96 05/20/96 05/20/96 <br /> Instrument I D # GCHP-7 GCHP-7 GGHP-7 GCHP-7 <br /> LCS % <br /> Recovery 102 105 106 106 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # BS052096 BS052096 BS052096 BS052096 <br /> Date Prepared 05/20/96 05/20/96 05/20/96 05/20/96 <br /> Date Analyzed 05/20/96 05/20/96 05/20/96 05/20/96 <br /> Instrument I D # GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> % Recovery 102 105 106 106 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 103 103 104 <br /> Relative % <br /> Difference 20 19 29 1 9 <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 /> *Linda <br /> preparation and apnalytical methods employed for the samples The LCS%recovery data is usedfory <br /> validation of sam le batch results Due to matrix effects,the OC limits for MS MSD's are adviso onlC Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 6051499 ENV <2> <br />