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Sequoia <br />Analytical <br />%3tsu1c1-nya1I - vuuun <br />6747 Sierra Court, Suite J <br />Dublin, CA 94568 <br />Attention: Doug Lee <br />Chesapeake Drive Redwood Cim CA 940630) 364-9600 FAX(650) 364-9233 <br />N. Wiget Lane Walnut Creek, CA 94598016) <br />0) 988-9600 FAX (510) 988-9673 <br />819 Striker Avenue, Suite 8 Sacramento, CA 95834 921-9600 FAX (916) 921-0100 <br /># 11194 -Trac::::> ::.................................... <br />»................................................. <br />�i✓Iierit Projectosc / y <br />Matrix: Solid <br />QC Sample Group: 806-1355 Reported: Jun 16, 1E <br />Analyte: <br />Benzene <br />Toluene <br />Ethyl <br />Xylenes <br />Sample Conc.: <br />N.D. <br />N.D. <br />Benzene <br />N.D. <br />QC Batch#: <br />SP061598 <br />SP061598 <br />SP061598 <br />SP061598 <br />Analyzed Date: <br />8020EXA <br />8020EXA <br />8020EXA <br />8020EXA <br />Analy. Method: <br />EPA 8020 <br />EPA 8020 <br />EPA 8020 <br />EPA 8020 <br />Prep. Method: <br />EPA 5030 <br />EPA 5030 <br />EPA 5030 <br />EPA 5030 <br />Analyst: <br />D. Newcomb <br />D. Newcomb <br />D. Newcomb <br />D. Newcomb <br />MS/MSD #: <br />8060693 <br />8060693 <br />8060693 <br />8060693 <br />Sample Conc.: <br />N.D. <br />N.D. <br />N.D. <br />N.D. <br />Prepared Date: <br />6/15/98 <br />6/15/98 <br />6/15/98 <br />6/15/98 <br />Analyzed Date: <br />6/15/98 <br />6/15/98 <br />6/15/98 <br />6/15/98 <br />Instrument I.D.#: <br />HP -4 <br />HP -4 <br />HP -4 <br />HP -4 <br />Conc. Spiked: <br />0.80 mg/Kg <br />0.80 mg/Kg <br />0.80 mg/Kg <br />2.4 mg/Kg <br />Result: <br />0.81 <br />0.84 <br />0.84 <br />2.5 <br />MS % Recovery: <br />101 <br />105 <br />105 <br />104 <br />Dup. Result: <br />0.86 <br />0.89 <br />0.90 <br />2.7 <br />MSD % Recov.: <br />108 <br />111 <br />113 <br />113 <br />RPD: <br />6.0 <br />5.8 <br />6.9 <br />7.7 <br />RPD Limit: <br />0-20 <br />0-20 <br />0-20 <br />0-20 <br />LCS #: <br />4LCS061598 <br />4LCS061598 <br />4LCS061598 <br />4LCS061598 <br />Prepared Date: <br />6/15/98 <br />6/15/98 <br />6/15/98 <br />6/15/98 <br />Analyzed Date: <br />6/15/98 <br />6/15/98 <br />6/15/98 <br />6/15/98 <br />Instrument I.D.#: <br />HP -4 <br />HP -4 <br />HP -4 <br />HP -4 <br />Conc. Spiked: <br />20pg/L <br />20Ng/L <br />20Ng/L <br />60Ng/L <br />LCS Result: <br />1.0 <br />1.0 <br />1.0 <br />3.1 <br />LCS % R@COV.: <br />125 <br />125 <br />125 <br />129 <br />LCS 50-150 50-150 50-150 50-150 <br />Control Limits <br />SEQUOIA ANALYTICAL, #1271 <br />ulianne Fegley <br />Project Manager <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 <br />8061355.GET <11> <br />