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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921.0100 <br /> • <br /> :. <br /> RtSNA industries Cfient project'lD': Arco'#548, Stockton <br /> 3164'Gofd Camp Dr., Suite 200 Matrix: Soil <br /> Rancho Cordova, CA 95670 <br /> Attentlon Greg Altimari OC Sample Group: 304-0005 Reported: Apr 6, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br />• <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: M. Nipp M.Nipp M. Hipp M. Nipp <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#: GBLK040593 GBLK040593 GBLK040593 GBLK040593 <br /> Date Prepared: N/A N/A N/A N/A <br /> Date Analyzed 4/5/93 4/5/93 4/5/93 4/5/93 <br /> Instrument I.D.#: GCHP2 GCHP2 GCHP2 GCHP2 <br />• LCS % <br /> Recovery: 96 98 98 100 <br /> Control Limits: 80-120 80-120 80-120 80-120 <br /> MS/MSD G93 04 094 G93 04 094 G93 04 094 G93 04 094 <br /> Batch#: 22B MS/MSD 22B MS/MSD 22B MS/MSD 22B MS/MSD <br /> Date Prepared: N/A N/A N/A N/A <br /> Date Analyzed 4/5/93 4/5/93 4/5/93 4/5/93 <br /> Instrument I.D.#: GCHP2 GCHP2 GCHP2 GCHP2 <br />• <br /> Matrix Spike <br /> % Recovery: 110 110 110 110 <br /> Matrix Spike <br /> Duplicate% <br />• Recovery: 100 100 110 107 <br /> Relative% <br /> Difference: 9.5 9.5 0.0 3.1 <br /> Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples. The LCS%recovery data is used for <br /> 6!!!1 validation of sample batch results. Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> I �Xw V1,0 and are not used to accept or reject batch results. <br /> Michael R. Giles <br />• laboratory Director <br /> 3040005.RES <4> <br />