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Sequoia <br />Analytical <br />Smith Environmental <br />441 N. Whisman, Bldg. 23 <br />Mountain View, CA 94043 <br />Attention: Rich Garlow <br />to 0 <br />680 Chesapeake Drive Rcdwood City, CA 94063 (415) 364.9600 FAX (415) 364.9233 <br />404 N. Wiget Lane Walnut Creek, CA 94598 (510) 988-9600 FAX (510) 988.9673 <br />819 Striker Avenue, Suite 8 Sacramento, CA 95834 (916) 921.9600 FAX (916) 921.0100 <br />Client Project ID: 20941, 94-261-94-20 <br />Matrix: Solid <br />Work Order #: 9609D08-01-12, 15 <br />Reported: Oct 3, 1996 <br />Analyte: Benzene <br />Toluene <br />Ethyl <br />Xylenes <br />H. Porter <br />Benzene <br />960966247 <br />QC Batch#: GC092596BTEXEXA <br />GCO92596BTEXEXA <br />GC092596BTEXEXA <br />GCO92596BTEXEXA <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 />I <br />11 <br />11 <br />Analyst: <br />H. Porter <br />H. Porter <br />H. Porter <br />H. Porter <br />MS/MSD #: <br />960966247 <br />960966247 <br />960966247 <br />960966247 <br />Sample Conc.: <br />N.D. <br />N.D. <br />N.D. <br />N.D. <br />Prepared Date: <br />9/23/96 <br />9/23/96 <br />9/23/96 <br />9/23/96 <br />Analyzed Date: <br />9/25/96 <br />9/25/96 <br />9/25/96 <br />9/25/96 <br />Instrument I.D.#: <br />GCHP7 <br />GCHP7 <br />GCHP7 <br />GCHP7 <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 />0.48 <br />MS % Recovery: <br />95 <br />85 <br />80 <br />80 <br />Dup. Result: <br />0.18 <br />0.16 <br />0.16 <br />0.48 <br />MSD % Recov.: <br />90 <br />so <br />80 <br />80 <br />RPD: <br />5.4 <br />6.1 <br />0.0 <br />0.0 <br />RPD Limit: <br />0-25 <br />0-25 <br />0-25 <br />0-25 <br />LCS #: <br />BLK092596 <br />BLK092596 <br />BLK092596 <br />BLK092596 <br />................ <br />Prepared Date: <br />9/23/96 <br />9/23/96 <br />9/23/96 <br />9/23/96 <br />Analyzed Date: <br />9/25/96 <br />9/25/96 <br />9/25/96 <br />9/25/96 <br />Instrument I.D.#: <br />GCHP7 <br />GCHP7 <br />GCHP7 <br />GCHP7 <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 />0.19 <br />0.18 <br />0.55 <br />LCS % Recov.: <br />105 <br />95 <br />90 <br />92 <br />MS/MSD 60-140 60-140 60-140 60-140 <br />LCS 70-130 70-130 70-130 70-130 <br />Control Limits <br />SEQU ANALYT <br />1 <br />Vyt s An ' itis <br />Pr ect 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 9609D08.SSS <2> <br />El <br />