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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> CD 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 - <br /> �-Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br />�I Associates Client Project ID Arco 2168, Stockton, CA <br /> 33 N Market Blvd Matrix Sod <br /> icramento, CA 95834 <br /> tention Claudio Avila QC Sample Group 6071051-56 Reported Aug 5, 1996 <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 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS073196 LCS073196 LCS073196 LCS073196 <br /> Date Prepared 07/31/96 07/31/96 07/31/96 07/31/96 <br /> Date Analyzed 07/31/96 07/31/96 07/31/96 07/31/96 <br /> lstrument I D # GCHP 1 GCHP 1 GCHP 1 GCHP 1 <br /> ISLCS <br /> Recovery 101 104 105 105 <br /> Control Limits' 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 6071250 6071250 6071250 6071250 <br /> Date Prepared 07/31/96 07/31/96 07/31/96 07/31/96 <br /> Date Analyzed: 07/31/96 07/31/96 07/31/96 07/31/96 <br /> nstrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 86 88 89 86 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 77 78 81 75 <br /> Relative% <br /> Difference 11 12 94 14 <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 />,•�t�G ( ,�/� .��� ALL validation of sample batch results Due to matrix effects the OC limits for MS/MSD s are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory <br /> 6071051 EMC _3> <br />