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Sequoia 680 Chcaapeakc Drwc Redwood City CA 94063 (4 15) 364 9600 FAX(415) 364 9233 <br /> 11%�p404 N W,get Uric Walnut Creck CA 94598 (51o) 988 9600 FAX{510)988 9673 <br /> Analytical 819 Striker Avenue Sint'8 Sacramento CA 95834 (916) 921 9600 FAX(916)421 0100 <br /> Pacific E=nvironmental Group Inc Client Project Ib Chevron #9-6258 Stockton, CA <br /> 11315 Sunrise Gold Circle, #M Matrix Sod <br /> Rancho Cordova, CA 95742 <br /> Attention Roger Hoff more QC Sample Group 6091009-18 Reported Oct 1 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> I <br /> Method EPA 8020 EPA 6020 EPA 8029 EPA 8020 EPA S015M <br /> Analyst S Phillips S Phillips S Phillips S Phillips C Lee <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 7 5 mg/kg <br /> LCS Batch# LCS092796 LCS092796 LCS092796 LCS092796 LC5092596 <br /> Date Prepared 09/27/96 09/27/96 09/27/96 09/27/96 09/25/96 <br /> Date Analyzed 09/27/96 09/27/96 09/27/96 09/27/96 09/26/96 <br /> Instrument• I�+D # GCHP-7 GCHP 7 GCHP 7 GCHP 7 GCHP 3A LCS % <br /> Recovery 104 106 106 107 98 <br /> Control Limits 70-130 70-130 70-130 70-130 60-140 <br /> MS/MSD <br /> Batch # 6091016 6091016 6091016 6091016 6091008 <br /> Date Prepared 09/27/96 09/27/96 09/27/96 09/27/96 09/25/96 <br /> Date Analyzed 09/27/96 09/27/96 09/27/96 09/27/96 09/26/96 <br /> Instrument I D # GCHP-7 GCHP-7 GCHP-7 GCHP 7 GCHP-3A <br /> Matrix Spike <br /> % Recovery 106 108 109 108 103 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 106 109 108 110 103 <br /> Relative % <br /> Dtfference 00 092 092 1 8 00 <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 /> 7Ltr1da <br /> /� preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> CL validation of sample batch results Due to matr x effects the OC limits for MS/MSDs are advisory only <br /> C Sch elder and are not used to accept or refect batch results <br /> ct Manager/Sacramento Labora ory <br /> 6091009 PFS - 16 <br />