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Sequoia 680 ChesapeaKe Drive Redwood Ctv CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Analytical t900 Bates Avenue Suite L Concord CA 94520 '510) 686 9600 FAX(510)686 9689 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 '916) 921 9600 FAX(916)921 0100 <br /> iBrown & Caldwell Client Project ID Arco 2133, Stockton <br /> 9616 Micron Ave Suite 600 Matrix Air <br /> Sacramento CA 95827 <br /> Attention Mindy Patterson QC Sample Goup 5020282-286 Reported Feb 24 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 2 0 mg/m3 2 0 mg/m' 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCS021095 LCS021095 LCS021095 LCS021095 <br /> Date Prepared: 2/10/95 2/10/95 2/10/95 2/10/95 <br /> Date Analyzed: 2/10/95 2/10/95 2/10/95 2/10/95 <br /> Instrument I.D.#: GCHP-38. GCHP-3B GCHP-3B GCHP-38 <br />• LCS % <br /> Recovery: 96 97 96 96 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# BLK021095 BLK021095 ELK021095 BLK021095 <br /> Date Prepared: 2/10/95 2/10/95 2/10/95 2/10/95 <br /> Date Analyzed: 2/10/95 2/10/95 2/10/95 2/10/95 <br /> Instrument I.D.# GCHP-3B GCHP-3B GCHP-3B GCHP-3B <br /> Matrix Spike <br /> %Recovery: 96 97 96 96 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery' 94 94 94 94 <br /> Relative% <br /> Difference: 21 31 21 21 <br /> SEQUOIA ANALYTICAL Please Note <br /> F The LCS Is a control sample of known,interferent free matrix that Is analyzed using the same reagents, <br /> �¢y„w preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> �JV� ��U validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Jennie Higgins and are not used to accept or reject batch results <br /> Project Manager <br /> 5020282 SRS <5> <br />