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•� Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N.Wiget lane Walnut Creek, CA 94598 (510) 988-9600 FAX(510)988-%73 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> !� <br /> EMCON ''Client Project lD.'""ARCO 2186,�Stocktori,.CA <br /> 1433 N. Market Blvd. Matrix: Water <br /> Sacramento, CA 95834 <br /> Attention: Deanna Santos QC Sample Group 7111280-1284 Reported: Dec 10, 199T <br /> DUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes MTBE <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Analyst: S. Phillips S. Phillips S. Phillips S.Phillips R.Yee <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L 50 ug/L <br /> LCS Batch#: LCS120197 LCS120197 LCS120197 LCS120197 LCS120297 <br /> Date Prepared: 12/01/97 12/01/97 12/01/97 12/01/97 12/02/97 <br /> Date Analyzed: 12/01/97 12/01/97 12/01/97 12/01/97 12/02/97 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 F3 <br /> • LCS % <br /> Recovery: 97 88 91 87 94 <br /> Control Limits: 70-130 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch #: 7111046 7111046 7111046 7111046 9711 F37-10 <br /> Date Prepared: 12/01/97 12/01/97 12/01/97 12/01/97 12/01/97 <br /> Date Analyzed: 12/01/97 12/01/97 12/01/97 12/01/97 12/01/97 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 F3 <br /> Matrix Spike <br /> % Recovery: 100 95 97 93 98 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 101 96 97 93 102 <br /> Relative% <br /> Difference: 1.0 1.0 0.0 0.0 4.0 <br /> �y SEQU lA ANALYTICA 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 /> validation of sample batch results. Due to matrix effects,the QG limits for MS/MSD's are advisory only <br /> i <br /> inda C. Schneider and are not used to accept or reject batch results. <br /> Project Manager/Sacramento Laboratory <br /> 7111280.EMC <6> <br />