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G) Sequoia 680 Chesapeake Drive Redwood Ciry, CA 940`63 (415) 364-9600 FAX (415) 364-9233 <br />404 N. Wiget Lane Walnut Creek, CA 94598 (510) 988-9600 FAX (510) 988-9673 <br />WipAnalytical 819 Striker Avenue, Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX (916) 921-0100 <br />Enviros Glient Project ID: Shell 3011 Benjamin Holt <br />270 Perkins Ave. Matrix: Solid <br />Sonoma, CA 95476 <br />Attention: Joe Neely Work Order #: 9610568 -01-13 <br />QUALITY CONTROL DATA REPORT <br />Analyte: Benzene <br />Toluene <br />Ethyl <br />Xylenes <br />Porter <br />MS/MSD #: <br />Benzene <br />961056803 <br />QC Batch#: GC100996BTEXEXB <br />GC100996BTEXEXB <br />GC100996BTEXEXB <br />GC100996BTEXEXB <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 />961o56a03 <br />961056803 <br />961056803 <br />961056803 <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 />GCHP-07 <br />GCHP-07 <br />GCHP-07 <br />GCHP-07 <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 />0.23 <br />0.20 <br />0.20 <br />0.59 <br />MS % Recovery: <br />115 <br />100 <br />100 <br />98 <br />Dup. Result: <br />0.22 <br />0.19 <br />0.19 <br />0.55 <br />MSD % Recov.: <br />110 <br />95 <br />95 <br />92 <br />RPD: <br />4.4 <br />5.1 <br />5.1 <br />7.0 <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 />GCHP-07 <br />GCHP-07 <br />GCHP-07 <br />GCHP-07 <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 />0.25 <br />0.22 <br />0.21 <br />0.64 <br />LCS % Recov.: <br />125 <br />110 - <br />105 <br />107 <br />MS/MSD <br />LCS 71-133 72-128 72-130 71-120 <br />Control Limits 55-145 47.149 47.155 56-140 <br />SEQUOIA ANALYTICAL <br />Aregory <br />Project Manager <br />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 matrix spike is an aliquot of sample <br />fortified with known quantities of specific compounds and subjected to the entire analytical procedure. If <br />the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br />interference, the LCS recovery is to be used to validate the batch. <br />-' MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative % Difference 9610568.EEE <1> <br />