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r <br /> 680 Chesapeake Dnve Redwood CI CA 94063 (415) 364 96W FAX <br /> Sequoia- n' (415; 364 9233 <br /> 404 N Wigct Lane Walnut Cmck CA 94598 (510) 988 96W FAX(510 988 9673 <br /> Analytical 819 Stnker Avenue Scute a Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> • Pacrfic Environmental Group, Inc Client Project ID Arco 2133, Stockton <br /> 11315 Sunrise Gold Circle, #M Matrix Water <br /> Rancho Cordova, CA 95742 <br /> Attention Greg Barclay OC Sample Group 6060849-58 Reported Jul 1, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X enes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 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 LCS062496 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-2 GCHP-2 GCHP-2 GCHP-2 <br /> . LCS °k <br /> Recovery 98 99 102 103 <br /> Control Limits 75-125 75.125 75-125 75-125 <br /> MS/MSD <br /> Batch# 6060849 6060849 6060849 6060849 <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 1 D # GCHP-2 GCHP 2 GCHP 2 GCHP-2 <br /> Matrix Spike <br /> %Recovery 99 101 105 104 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 98 101 104 104 <br /> Relative % <br /> Difference 10 00 10 40 <br /> SEQUOIA 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 /> G validation of sample batch results Due to matrix effects the CC limits for MS/MSD s are advisory only <br /> i Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 6060849 PES <6> <br />