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Sequoia 680 Chesapeake give 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 /> 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 1A/Chevron 9-6171 <br /> 11315 Sunrise Gold Circle, Ste M Matrix Sall <br /> Rancho Cordova CA 95742 <br /> Attention Dennis M Jones OC Sample Group 8010955-0959 Reported Feb 2 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# LCS013098 LCS013098 LCS013098 LCS013098 <br /> Date Prepared 01/30/98 01/30/98 01/30/98 01/30/98 <br /> Date Analyzed 01/30/98 01/30/98 01/30/98 01/30/98 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP 1 GCHP-1 <br /> LCS % <br /> Recovery 106 102 107 106 <br /> Control Limits 70 130 70 130 70 130 70 130 <br /> MS/MSD <br /> Batch # 8010975 8010975 6010975 8010975 <br /> Date Prepared 01/30/98 01/30/98 01/30/98 01/30/98 <br /> Date Analyzed 01/30/98 01/30/98 01/30/98 01/30/98 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP 1 <br /> Matrix Spike <br /> % Recovery 92 90 96 96 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 93 92 97 98 <br /> Relative % <br /> Difference 1 1 2 2 1 0 21 <br /> iSEQUOIA 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 /> 7 validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> Linda C Schneider and are not used to accept or refect batch results <br /> Project Manager/Sacramento Laboratory <br /> 8010955 PFS <3> <br />