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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9133 <br /> 404 N W,gct Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Delta Environmental Consultants Client Project lb Exxon #7-3708, Stockton A <br /> 3164 Gold Camp Dr, Suite 200 Matrix Sol[ <br /> Rancho Cordova, CA 95670 <br /> Attention Todd Galati QC Sample Group 5121366-68 Reported Dec 29, 1995 <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 V Owens V Owens V Owens V Owens C M <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# LCS122895 LCS122895 LCS122895 LCS122895 LCS122895 <br /> Date Prepared: 12/28/95 12/28/95 12/28/95 12/28/95 12/28/95 <br /> Date Analyzed 12/28/95 12/28/95 12/28/95 12/28/95 12/29/95 <br /> Instrument I.D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 MTJA-2 <br /> 11911 LCS % <br /> Recovery 89 91 91 89 100 <br /> Control Limits 75-125 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# 8S122895 BS122895 SS122895 BS122895 951215961 <br /> Date Prepared- 12/28/95 12/28/95 12/28/95 12/28/95 12/26/95 <br /> Date Analyzed 12/28/95 12/28/95 12/28/95 12/28/95 12/29/95 <br /> Instrument I D.#- GCHP-1 GCHP-1 GCHP-1 GCHP-1 MTJA-2 <br /> Matrix Spike <br /> % Recovery- 81 88 86 84 90 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 83 88 89 84 170 <br /> Relative % <br /> Difference- 24 00 34 00 62 <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 /> validation of sample batch results Due to matrix effects,the CC limits for MS/MSDs are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br />/ Project Manager <br /> 5121366 DLT c3> <br />