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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> �„� Analytical <br /> Pacific Environmental Group Client Project ID 920-122 1 A/Chevron 9-9840, Stockton, CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Sat <br /> Rancho Cordova, CA 95742 <br />' Attention Tim Arenson QC Sample Group 8030563-0575 Reported Mar 17, 1998 <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. C Lee C Lee C Lee C Lee <br /> Concentration <br />' Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch#: LCS031398 LCS031398 LCS031398 LCS031398 <br /> Date Prepared 03/13/98 03/13/98 03/13/98 03/13/98 <br /> Date Analyzed 03/13/98 03/13/98 03/13/98 03/13/98 <br /> Instrument I D # GCHP 2 GCHP-2 GCHP-2 GCHP-2 <br /> iLCS <br /> Recovery 94 92 89 88 <br /> Control Limits 70-130% 70-130% 70-130% 70-130° <br /> MS/MSD <br /> Batch # 8030573 8030573 8030573 8030573 <br /> Date Prepared 03/13/98 03/13/98 03/13/98 03/13/98 <br /> Date Analyzed 03/13/98 03/13/98 03/13/98 03/13/98 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP 2 <br />' Matrix Spike <br /> %Recovery 80 72 82 77 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 80 72 84 77 <br />' Relative% <br /> Difference 00 0 0 24 00 <br /> SEQUOIA ANALYT CAL 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 /> F <br /> validation of sample batch results Due to matrix effects the QC limits for MS/MSDs are advisory only <br /> SC nelder and are not used to accept or reject batch results <br /> Pt Manager/Sacramento Labors ory <br /> 8030563 PES <9> <br />