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Sequoia • 680 Chesapeake Dnvc Rcdwood City CA 90 (415) 364 9600 FAX(415) 364 9233 <br /> ►V' 404 N Wiget Lane Walnut Creek CA 94598 (5t0) 988 9600 FAX(5 10)988 9673 <br /> Analytical 819 Striker Avcnue Suite 8 Sacramento CA 95834 (916) 911 9600 FAX(916)921 0100 <br /> Pacific Environmental Group, Inc Client project lb Chevron #9-6258, Stockton, CA <br /> 11315 Sunrise Gold Circle, #M Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention Roger Hoffmore QC Sample Group 6101185-90 Reported Nov 5 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 <br /> Analyst S Phillips S Phillips S Phillips S Phillips K Barts <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 50 mg/kg <br /> LCS Batch# LCS102996 LCS102996 LCS102996 LCS102996 LCS103096 <br /> Date Prepared 10/29/96 10/29/96 10/29/96 10/29/96 10/30/96 <br /> Date Analyzed 10/29/96 10/29/96 10/29/96 10/29/96 11/04/96 <br /> Instrument LD # GCHP-7 GCHP-7 GCHP 7 GCHP-7 ICP-1 <br /> . LCS % <br /> Recovery 94 96 95 96 96 <br /> Control Limits 70-130 70 130 70-130 70-130 80-120 <br /> MS/MSD <br /> Batch # 6101238 6101238 6101238 6101238 6101190 <br /> Date Prepared 10/29/96 10/29/96 10/29/96 10/29/96 10/30/96 <br /> Date Analyzed 10/29/96 10/29/96 10/29/96 10/29/96 11/04/96 <br /> Instrument I D # GCHP-7 GCHP-7 GCHP-7 GCHP-7 ICP-1 <br /> Matrix Spike <br /> %Recovery 92 94 94 96 88 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 80 84 86 82 88 <br /> Relative% <br /> Difference 14 11 89 16 00 <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 /> f 1Y �r.t 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 /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory <br /> 610118S PES -3- <br />