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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (4 15) 164.9600 FAX(415) 364-9233 <br /> 401 N.Wigtl I-an, Walnut Creek,CA 94598 (510) 988-9600 FAX(510)989-9673 <br /> Analtical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0 100 <br /> y <br /> ... ....................... <br /> ........... <br /> ................................... ... .. . .... <br /> .......... <br /> .........CA <br /> Pacal"c"... lent Project ID: Arco 2083, racy, <br /> 11315 Sunrise Gold Circle, #M Matrix: Water <br /> Rancho Cordova, CA 95742 <br /> Attention: Greg Barclay QC Sample Group 6110672-78 Reported: Dec 3, 1996' <br /> 4 <br /> ................... ...... <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- 11 <br /> J <br /> Benzene Toluene Benzene li XYlenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 II EPA 8020 <br /> Analyst: 8,Williams B.Williams B.Williams i B.Williams <br /> Concentration Ij <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#: LCS112596 LCS1 12596 LC61 12596 LCS 112596 <br /> Date Prepared: 11/25/96 11/25/96 11/25/96 9 11/25/96 <br /> Date Analyzed: 11/25/96 11/25/96 11/25/96 11/25/96 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 II GCHP-1 <br /> LCS % <br /> Recovery: 103 107 106 <br /> 106 <br /> Control Limits: 70-130 70-130 70-130 70-130 <br /> ii <br /> .................................... ........ <br /> ............... ................. <br /> .................... ......... ................ <br /> .. ................. <br /> ...................... ....... <br /> ........... <br /> .......... <br /> MS/MSD <br /> Batch #: 6110778 6110778 6110778 i 6110778 <br /> Date Prepared: 11/25/96 11/25/96 11/25/96 11/25/96 <br /> Date Analyzed: 11/25/96 11/25/96 11/25/96 11/25/96 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-11 GCHP-1 <br /> Matrix Spike <br /> % Recovery: 100 103 105 <br /> 103 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 98 102 103 103 <br /> Relative% <br /> Difference: 2.0 0.98 1.9 0.0 <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 /> validation of sample batch results. Due tc matrix effects,the CC limits for MS/MSD's are advisory only <br /> �i nd a C. Schneider and are not used to accept or reject batch results. <br /> Project <br /> ro� ... <br /> lect M� <br /> roject Manager/Sacramento Labor—aTo—Fy-- <br /> 6110672.PES <4> <br />