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Sequoia680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wig,, Lane Walnut Creek CA 94598 (510) 988 9600 FAX 510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> Pacific Environmental Group Client Project ID 920-122 1A/Chevron 9-9840, Stockton, CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson OC Sample Group 8030559-0562 Reported Mar 27, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes MTBE MTBE <br />' Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 EPA 8260 <br /> Analyst C Lee C Lee C Lee C Lee K Pocan K Pocan <br /> Concentration <br />' Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 2,500 fig/kg 2,500 fig/kg <br /> LCS Batch# LCS032398 LCS032398 LCS032398 LCS032398 LCS032498 LCS032598 <br /> Date Prepared 03/23/98 03/23/98 03/23/98 03/23/98 03/24/98 03/25/98 <br /> Date Analyzed 03/23/98 03/23/98 03/23/96 03/23/98 03/24/98 03/25/98 <br /> Instrument I D # GCHP-1 GCHP 1 GCHP-1 GCHP-1 MS-F1 MS-F1 <br /> LCS % <br /> Recovery 107 98 100 94 92 101 <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 701,30% <br /> MS/MSD <br /> Batch # 8030559 8030559 8030559 8030559 65032098 8030040 <br /> Date Prepared 03/23/98 03/23/98 03/23/98 03/23/98 03/20/98 03/25/98 <br /> Date Analyzed 03/23/98 03/23/98 03/23/98 03/23/98 03/20/98 03/25/98 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 MS-171 MS-F1 <br />' Matrix Spike <br /> % Recovery 100 95 96 95 99 137 <br />' Matrix Spike <br /> Duplicate % <br /> Recovery 99 91 94 94 93 146 <br />' Relative % <br /> Difference 1 0 43 21 1 0 6 3 77 <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 QC limits for MS/MSD s are advisory only <br /> da C Schnetder and are not used to accept or reject batch results <br /> rolect Manager/Sacramento Labors ory <br />' 8030559 PES <6> <br />