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680 Chesapeake Dnve Redwood G C4 94063 (415) 364 96W FAX <br /> Sequoias ry (415) 364 9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (510) 989 9600 FAX(510)988 9673 <br /> X117 Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Pacific Environmental Group, Inc Client Project ID Arco 2133, Stockton <br /> 11315 Sunrise Gold Circle, #M Matnx Water <br /> Rancho Cordova, CA 95742 <br /> Attention Greg Barclay QC Sample Group 6450849-58 Reported Jul 1, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyi. <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 BPA 8020 <br /> Analyst V Owens V Owens V Owens V Owens <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS062496 LCW62496 LCS062496 LCS062496 <br /> Date Prepared 06/24/96 06/24/96 06/24/96 06/24/96 <br /> Date Analyzed 06/24/96 06/24/96 06/24/96 06/24/96 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP 1 <br /> LCS <br /> Recovery 91 97 100 101 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 6060772 6060772 6060x72 6060772 <br /> Date Prepared 06/24/96 06/24/96 06/24/96 06/24/96 <br /> Date Analyzed 06/24/96 06/24/96 06/24/96 06/24/96 <br /> Instrument I D #- GCHP-1 GCHP-1 GCHP i GCHP-1 <br /> Matrix Spike <br /> % Recovery 78 67 89 92 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 86 e8 84 88 <br /> Relative % <br /> Difference 98 1 1 58 44 <br /> SEQUOIA ANALYTICAL Please dote <br /> / The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> 7/L <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 OC limits for MS/MSDs are advisory only <br /> a C Schneider and are not used to accept or reject batch results <br /> Prole Manager/Sacramento Labora ory <br /> 6060849 P E S <5> <br />