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Sequoia <br />*.r 680 Chesapeake Drive <br />Redwood City, CA 9410/ <br />(415) 364.9600 <br />FAX (415) 364-9233 <br />Analytical <br />404 N. Wiset Lane <br />819 Striker Avenue, Suite 8 <br />Walnut Creek, CA 94598 <br />Sacramento, CA <br />(510) 988-9600 <br />FAX (510) 988-9673 <br />GC100996BTEXE)(C <br />GC100996BTEXE)(C <br />95834 <br />(916) 921-9600 <br />FAX (916) 921-0100 <br />QUALITY CONTROL DATA REPORT <br />Analyte: Benzene <br />Toluene <br />Ethyl <br />Xylenes <br />Porter <br />MS/MSD #: <br />Benzene <br />961057612 <br />QC Batch#: GC100996BTEXEXC <br />GC100996BTEXEXC <br />GC100996BTEXE)(C <br />GC100996BTEXE)(C <br />Analy. Method: EPA 8020 <br />EPA 8020 <br />EPA 8020 <br />EPA 8020 <br />Prep. Method: EPA 5030 <br />EPA 5030 <br />EPA 5030 <br />EPA 5030 <br />Analyst: <br />Porter <br />Porter <br />Porter <br />Porter <br />MS/MSD #: <br />961057612 <br />961057612 <br />961057612 <br />961057612 <br />Sample Conc.: <br />N.D. <br />N.D. <br />N.D. <br />N.D. <br />Prepared Date: <br />10/9/96 <br />10/9/96 <br />10/9/96 <br />10/9/96 <br />Analyzed Date: <br />10/9/96 <br />10/9/96 <br />10/9/96 <br />10/9/96 <br />Instrument I.D.#: <br />GCHP22 <br />GCHP22 <br />GCHP22 <br />GCHP22 <br />Conc. Spiked: <br />0.20 mg/Kg <br />0.20 mg/Kg <br />0.20 mg/Kg <br />0.60 mg/Kg <br />Result: <br />0.19 <br />0.17 <br />0.16 <br />0.53 <br />MS % Recovery: <br />95 <br />e5 <br />80 <br />88 <br />Dup. Result: <br />0.19 <br />0.17 <br />0.16 <br />0.52 <br />MSD % Recov.: <br />95 <br />85 <br />80 <br />67 <br />RPD: <br />0.0 <br />0.0 <br />0.0 <br />1.9 <br />RPD Limit: <br />0-25 <br />0-25 <br />0-25 <br />0-25 <br />LCS #: <br />BLK100996 <br />BLK100996 <br />BLK100996 <br />BLK100996 <br />Prepared Date: <br />10/9/96 <br />10/9/96 <br />10/9/96 <br />10/9/96 <br />Analyzed Date: <br />10/9/96 <br />10/9/96 <br />10/9/96 <br />10/9/96 <br />Instrument I.D.#: <br />GCHP22 <br />GCHP22 <br />GCHP22 <br />GCHP22 <br />Conc. Spiked: <br />0.20 mg/Kg <br />0.20 mg/Kg <br />0.20 mg/Kg <br />0.60 mg/Kg <br />LCS Result: <br />0.21 <br />0.16 <br />0.18 <br />0.54 <br />LCS % Recov.: <br />105 <br />90 <br />90 <br />90 <br />60-140 <br />60-140 <br />60-140 <br />60-140 <br />LCS 70-130 <br />70-130 <br />70-130 <br />70-130 <br />Control Limits <br />SEQUOIA AN LYTICAL <br />Ik Gregory <br />Project Manager <br />lease Note: <br />The LCS is a control sample of known, interferent -free matrix that is analyzed using the same reagents, <br />reparation, and analytical methods employed for the samples. The matrix spike is an aliquot of sample <br />)rtified with known quantities of specific compounds and subjected to the entire analytical procedure. If <br />le recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br />lterference, the LCS recovery is to be used to validate the batch. <br />** MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative % Difference 9610570.EEE <1> <br />m <br />