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CD Sequoia 680 Chesapeake Drive Redwood Cay CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> 1117 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 Soil <br /> Rancho Cordova, CA 95670 <br /> Attention Todd Galati QC Sample Group 6010001-9 Reported Jan 4, 1996 <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 J Padilla J Padilla J Padilla J Padilla <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS010296 LCS010296 LCS010296 LCS010296 <br /> Date Prepared 1/2/96 1/2/96 1/2/96 1/2/96 <br /> Date Analyzed 1/2/96 1/2/96 1/2/96 1/2/96 <br /> Instrument I D # GCHP-1 GCHP 1 GCHP 1 GCHP-1 <br /> 011 LCS <br /> Recovery 90 90 90 92 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 9512H03-3 9512H03-3 9512H03-3 95121-103-3 <br /> Date Prepared- 1/2/96 1/2/96 1/2/96 1/2/96 <br /> Date Analyzed: 1/2/96 1/2/96 1/2/96 1/2/96 <br /> Instrument LD #- GCHP 1 GCHP-1 GCHP-1 GCHP 1 <br /> Matrix Spike <br /> % Recovery- 80 90 85 83 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 85 85 85 87 <br /> Relative % <br /> Difference 51 57 00 39 <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 /> '- <br /> validation of sample batch results Due to matrix effects the QC limits for MS/MSO s are advisory only <br /> Linda C Schneider and are not used to accent or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> salfloo, DLT <5> <br />