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Sequoia <br />J <br />nalytical <br />30-A Lindbergh Ave. <br />Livermore, CA 94550 <br />Attention: Katy Racke <br />hesapeake Drive Redwood City, CA (650) 364-9600 FAX(650)364-9233 <br />404 N. Wiget Lane Walnut Creek, CA 94598 (925) 988-9600 FAX (925) 988-9673 <br />819 Striker Avenue, Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX (916) 921-0100 <br />1455 McDowell Blvd. North, Ste. D Petaluma, CA 94954 (707) 792-1865 FAX(707)792-0342 <br />Cllent i'roject ID: Qulk Stop#124 Manteca <br />Matrix: Solid <br />QC Sample Group: 8100202-204 Reported: Oct 6, 1998 <br />Analyte: <br />Benzene <br />Toluene <br />Ethyl <br />Xylenes <br />MTBE <br />Sample Conc.: <br />N.D. <br />N.D. <br />Benzene <br />N.D. <br />310µg/kg <br />QC Batch#: <br />SP100598 <br />SP100598 <br />SP100598 <br />SP100598 <br />SP092998 <br />Analyzed Date: <br />8020EXA <br />8020EXA <br />8020EXA <br />8020EXA <br />8260EXA <br />Analy. Method: <br />EPA 8020 <br />EPA 8020 <br />EPA 8020 <br />EPA 8020 <br />EPA 8260 <br />Prep. Method: <br />EPA 5030 <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 />N. Nelson <br />MS/MSD #: <br />8092408 <br />8092408 <br />8092408 <br />8092408 <br />LCS100598 <br />Sample Conc.: <br />N.D. <br />N.D. <br />N.D. <br />N.D. <br />310µg/kg <br />Prepared Date: <br />10/5/98 <br />10/5/98 <br />10/5/98 <br />10/5/98 <br />8 <br />Analyzed Date: <br />10/5/98 <br />10/5/98 <br />10/5/98 <br />10/5/98 <br />10/1/98 <br />Instrument I.D.#: <br />HP -4 <br />HP -4 <br />HP -4 <br />HP -4 <br />GC/MS-2 <br />Conc. Spiked: <br />0.80 mg/Kg <br />0.80 mg/Kg <br />0.80 mg/Kg <br />2.4 mg/Kg <br />2500 Ng/kg <br />Result: <br />0.77 <br />0.65 <br />0.67 <br />2.3 <br />2,900 <br />MS % Recovery: <br />96 <br />81 <br />84 <br />96 <br />104 <br />Dup. Result: <br />0.77 <br />0.65 <br />0.67 <br />2.3 <br />3,000 <br />MSD % Recov.: <br />96 <br />81 <br />84 <br />96 <br />108 <br />RPD: <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />3.4 <br />RPD Limit: <br />0-20 <br />0-20 <br />0-20 <br />0-20 <br />0-25 <br />LCS #: <br />4LCS100598 <br />4LCS100598 <br />4LCS100598 <br />4LCS100598 <br />LCS100598 <br />Prepared Date: <br />10/5/98 <br />10/5/98 <br />10/5/98 <br />10/5/98 <br />10/5/98 <br />Analyzed Date: <br />10/5/98 <br />10/5/98 <br />10/5/98 <br />10/5/98 <br />10/5/98 <br />Instrument I.D.#: <br />HP -4 <br />HP -4 <br />HP -4 <br />HP -4 <br />GC/MS-2 <br />Conc. Spiked: <br />0.80 mg/Kg <br />0.80 mg/Kg <br />0.80 mg/Kg <br />2.4 mg/Kg <br />2500 Ng/kg <br />LCS Result: <br />0.84 <br />0.70 <br />0.72 <br />2.4 <br />2,400 <br />LCS % Recov.: <br />105 <br />88 <br />90 <br />100 <br />96 <br />LCS 50-150 50-150 50-150 50-150 65-135 <br />Control Limits <br />SEQUOIA ANALYTICAL, #1271 <br />(rliannee Fegley <br />Project Manager <br />urease 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 <br />61, <br />8100202.ALT <5> <br />