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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4 15) 364 9600 FAX(415} 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 /> Delta Environmental Consultants Client Project ID Exxon #7-3708, Stockton, CA <br /> 3164 Gold Camp Dr, Suite 200 Matrix Water <br /> Rancho Cordova, CA 95670 <br /> Attention Todd Galati QC Sample Group 5121364-65 Reported Jan 5, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE E*hyl- <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 <br /> Analyst V Owens V Owens V Owens V Owens Chiaravalloti <br /> Concentration <br /> Spiked- 10 ug/L 10 ug/L 10 ug/L 30 ug/L 50 mg/kg <br /> LCS Batch# LCS010396 LGS010396 LCS010396 LCS010396 LCS122895 <br /> Date Prepared 01/03/96 01/03/96 01/03/96 01/03/96 12/28/95 <br /> Date Analyzed 01/03/96 01/03/96 01/03/96 01/03/96 01/05/96 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 ICP-1 <br /> LCS % <br /> Recovery- 109 111 114 105 101 <br /> Control Limits 75-125 75-125 75-125 75-125 80-120 <br /> MS/MSD <br /> Batch # 5121364 5121364 5121364 5121364 5121318 <br /> Date Prepared: 01/03/96 01/03/96 01/03/96 01/03/96 12/28/95 <br /> Date Analyzed: 01/03/96 01/03/96 01/03/96 01/03/96 01/05/96 <br /> Instrument I D # 3CHP-1 GCHP-1 GCHP-1 GCHP-1 ICP-1 <br /> Matrix Spike <br /> % Recovery 108 104 112 102 84 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 121 117 126 120 74 <br /> Relative % <br /> Difference 11 12 12 16 13 <br /> EQUOIA 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 /> t'/ e C C �4 �� validation of sample batch results Due to matrix effects the CC limits for MtS/MISOs are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5121364 DLT <3> <br />