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(D Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Weget Lan, Walnut Creels CA 94598 (510) 988 9600 FAX(5 10)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 %00 FAX(916) 921 0100 <br /> elta Environmental Consultants Client Project Ili Exxon 47-3708, Stockton, CA <br /> 3164 Gold Camp Dr, Sidle 200 Matrix Sall <br /> Rancho Cordova, CA 95670 <br /> Attention Todd Galati CC Sample Group 601-0464 Reported Jan 22, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethvl- <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 <br /> Analyst B Williams B Williams B Williams 5 Williams K Berta <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# LCS011796 LCS011796 LCS011796 LCS011796 LCS011796 <br /> Date Prepared 01/17/96 01/17/96 01/17/96 01/17/96 01/17/96 <br /> Date Analyzed: 01/17/96 01/17/96 01/17/96 01/17/96 01/22/96 <br /> Instrument I.D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 ICP-1 <br /> r <br /> 0 LCS % <br /> Recovery 93 96 97 96 105 <br /> Control Limits. 75-125 75-125 75-125 75-125 80-120 <br /> wr,nw u f f + + f n.. r '.f fw r' + v .. J • v v.0 nr v v r .. of, +Y k n r o f r. ♦v <br /> MS/MSD <br /> Batch#• BS011796 BS0117% B8011796 SS011796 6010394 <br /> Date Prepared. 01/17/96 01/17/96 01/17/96 01/17/96 01/17,/96 <br /> Date Analyzed: 01/17/96 01/17/96 01/17/96 01/17/96 01/22/96 <br /> Instrument LD #` GCHP-2 GCHP-2 GCHP-2 GCHP-2 ICP-1 <br /> Matrix Spike <br /> % Recovery: 95 100 100 98 97 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 90 95 95 95 93 <br /> Relative % <br /> Difference 54 51 51 31 42 <br /> SEQUOIA ANALYTICAL Please Note <br /> -1 The LCS is a control sample of known,lnterterent free matrix that 1s analyzed using the same reagents, <br /> /� preparation and analytical methods employed far the samples The LCS%recovery data 1s used for <br /> validation of sample batch results Due to matrix affects,the OC 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 Lahore ory <br /> 6010464 DLT 43> <br />