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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415)364-923a <br /> a) 4 4— i) 404 N Wlget LaneWainut Geek,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 /> gro West, Inc Client Project ID Shell, 6731 Kaci#Ic Ave, Stockton, CA Y r H <br /> 50 Melody Lane, Ste 160 Matrix Water <br /> Roseville, CA 95678 <br /> Attention Will Shipp QC Sample Group 5091325-1328 Reported Oct 6, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 BPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked: 10 mg/L 10 mg/L 10 mg/L 30 mg/L <br /> LCS Batch# LCS100495 LCS100495 LCS100495 LC8100495 <br /> Date Prepared: 10/4/95 10/4/95 10/4/95 10/4/95 <br /> Date Analyzed. 10/4/95 10/4/95 10/4/95 10/4/95 <br /> Instrument I..D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery* 103 100 100 99 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> r.n } r v v rp♦ f ♦v r 4 r.f r rf tir ti r r}u 4 f v x f s v w <br /> r v r r u ryvr ryrf} ~ rrrr tnxrrw ry vv:. v.v .v r4 xf }rr ii 5'h} r r.rrw J v r 1 wt <br /> MS/MSD <br /> Batch# BS100495 BS100495 B8100495 BS100495 <br /> Date Prepared. 10/4/95 10/4/95 10/4/95 10/4/95 <br /> Date Analyzed, 10/4/95 10/4/95 10/4/95 10/4/95 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matnx Spike <br /> % Recovery, 98 96 97 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recoverv: 93 92 94 91 <br /> Relative% <br /> Difference: 52 42 31 64 <br /> SEQUOIA ANALYTIC L Please Note <br /> The LCS is a control sampie of known,interferent free matrix that 1s analyzed using the same reagents, <br /> *Zloe�(1111 <br /> L7 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 <br /> 5091325 FUG <3;, <br /> �Scr' <br />