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(1) Sequoia 680 Chesapeake i7nve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9133 <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 (916) 921 9600 FAX{916)921 0100 <br /> Pacific environmental Group Client Project ID 920-119 119/Chevron 9-6171, Stockton, CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson QC Sample Group 8010315-0335, 0337-0345 Reported Jan 15, 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# LCS011498 LCS011498 LCS011498 LCS011498 <br /> Date Prepared 01/14/98 01/14/98 01/14/98 01/14/98 <br /> Date Analyzed 01/14/98 01/14/98 01/14/98 01/14/98 <br /> Instrument I.D # GCHP-1 GCHP 1 GCHP-1 GCHP-1 <br /> LCS <br /> Recovery 100 101 101 101 <br /> Control Limits 70 130 70 130 70-130 70-130 <br /> MS/MSD <br /> Batch# 8010323 8010323 8010323 8010323 <br /> Date Prepared 01/14/98 01/14/98 01/14/98 01/14/98 <br /> Date Analyzed 01/14/98 01/14/98 01/14/98 01/14/98 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 88 87 93 92 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 88 88 93 93 <br /> Relative% <br /> Difference 00 1 1 00 1 1 <br />/SEQUIA ANALYTI L 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 'rhe LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects the CC limits for MS/MSD s are advisory only <br /> Schneider and are not used to accept or reject batch results <br /> Manager/Sacramento Laboratory <br /> 8010315 PES <14n <br />