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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Witget Lane Walnut Creek CA 94598 (510) 988 96)0 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 96W FAX (916)921 0100 <br /> Pacific Environmental Croup Client Protect ID 920-119 1A/Chevron 9-6171 <br /> 11315 Sunrise Gold Circle, Ste M Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson OC Sample Group 8010367-0369 Reported Jan 20, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes TRPH <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 SM 5520 CF <br /> Analyst C Lee C Lee C Lee C Lee L Martin <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 100 mg/kg <br /> LCS Batch# LCSO11598 LCS011598 LCS011598 LCS011598 LCS011998 <br /> Date Prepared 01/15/98 01/15/98 01/15/98 01/15/98 01/19/98 <br /> Date Analyzed 01/15/98 01/15/98 01/15/98 01/15/98 01/19/98 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 IR-1 <br /> LCS % <br /> Recovery 95 92 97 96 96 <br /> Control Limits 70-130 70-130 70-130 70-130 70 130 <br /> MS/MSD <br /> Batch # 8010335 8010335 8010335 8010335 8010367 <br /> Date Prepared 01/15/98 01/15/98 01/15/98 01/15/98 01/19/98 <br /> Date Analyzed 01/15/98 01/15/98 01/15/98 01/15/98 01/19/98 <br /> Instrument I D # GCHP 1 GCHP-1 GCHP-1 GCHP 1 IR-1 <br /> Matrix Spike <br /> % Recovery 71 76 83 84 40 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 73 76 84 85 52 <br /> Relative % <br /> Difference 28 00 1 2 1 2 26 <br />�SEGll101A ANALY 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%reovery data is used for <br /> validation of sample batch results Due to matrix effects the QC limits for MS/MSDs are advisor only <br /> inda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labor— ory <br /> 7 <br /> 8010367 PES <12> <br />