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Sequoia 680 Chesapeake Drive WalnutRcdwood Cityeek A 4598 (515) 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 Striker Avenue,Suite 8 Sacramento, CA 95834 (91[6) 921 9600 FAX (916)921 0100 <br /> x,17 <br /> Oros, Inc Client Project ID Shell, 141 N EI Dorado, Stockton, CA <br /> P O Box 259 Matrix Air <br /> Sonoma, CA 95476-0259 Reported Aug 8, 1996 <br /> Attention Joe Neely QC Sample Group 607-1297 p <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 6020 EPA 8020 <br /> Analyst V Owens V Owens V Owens V Owens <br /> Concentration <br /> Spiked 2 0 mg/m' 2 0 mg/m3 2 0 mg/m' 6 0 mg/m' <br /> LCS Batch# LCS073196 LCS073196 LCS073196 LCS073196 <br /> Date Prepared 07/31/96 07/31/96 07/31/96 07/31/95 <br /> Date Analyzed 07/31/96 07/31/96 07/31/96 07/31/96 <br /> instrument I D # GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> LCS % <br /> Recovery 103 111 104 107 <br /> Control Limits 70 130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # BS073196 BS073196 85073996 85073196 <br /> Date Prepared 07/31/96 07/31/96 07/31/96 07/31/96 <br /> Date Analyzed 07/31/96 07/31/96 07/31/96 07/31/95 <br /> Instrument I D # GCHP-7 GCHP 7 GCHP-7 GCHP 7 <br /> Matrix Spike <br /> % Recovery 101 102 102 104 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 102 104 105 107 <br /> Relative% 2 a <br /> Difference 098 <br /> 1 9 2 9 <br /> �SEQUOIA ANALYTICAL Please Nate <br /> The LGS 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 /> lnda C Schneider and are nat used to accept or refect hatch results <br /> Project Manager/Sacramento Labora ory 6071297 ENV <2> <br />