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Sequoia 680 Chesapeake Drive Redwood City,C4 944063 (415) 364-9600 FAX(415) 364.92 IS <br /> 404 14.W18et Lanc Wal C.,cck,CA 94.598 (5I0) 988.9600 FAX Wo)988.9673 <br /> S <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,U 95834 (916) 921.9600 FAX(916)921.0100 <br /> Alton Geosclence Client'Proj 606` Mob1104-343 <br /> 30-A Lindbergh Ave. Matrix: Solid <br /> Livermore,CA 94550 <br /> Attention: Ailsa LeMay QC Sample Group: 5060180-69 Reported: Jun 12, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel Diesel Diesel <br /> ' Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M EPA S015M EPA S015M <br /> Analyst: J.Fontecha J.Fontecha J.Fontecha J.Fontecha J.Dinsay J.Dinsay J.Dinsay <br /> ' MS/MSD <br /> Balch#: 5060186 5060186 5060186 5060186 5060078 5060078 5060186 <br /> ' Date Prepared: 6/6/95 6/6/95 6/6/95 6/6/95 6/6/95 6/6/95 6/8/95 <br /> Date Analyzed: 6/6/95 6/6/95 6/6/95 6/6/95 6/7/95 6/7/95 6/9/95 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 HP-3A HP-38 HP-3A <br /> ' Conc. Spiked: 0.40 mg/kg 0.40 mg/kg 0,40 mg/kg 1.2 mg/kg 10 mg/kg 10 mg/kg 10 mg/kg <br /> Matrix Spike <br /> % Recovery: 88 95 98 98 77 100 75 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 88 95 98 98 78 81 81 <br /> Relative% <br /> Difference: 0.0 0.0 0.0 0.0 1.3 21 7.7 <br />' LCS Batch#: 2LCS060695 2LCS060695 2LCS060695 2LCS060695 BLK060695 BLK060695 SLK060895 <br /> t Date Prepared: 6/6/95 6/6/95 6/6/95 6/6/95 6/6/95 6/6/95 6/8/95 <br /> Date Analyzed: 6/6/95 6/6/95 6/6/95 6/6/95 6/7/95 6/7/95 6/9/95 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 HP-3A HP-38 HP-3A <br />' LCS% <br /> Recovery: 102 109 112 112 70 66 66 <br />' Recovery <br /> Control Limits: 55-145 47-149 47-155 56-140 38-122 38.122 38-122 <br /> Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the sante reagents, <br /> Zo <br /> A ANALYTICAL, #1271 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 /> Kevin Van Slambrook <br /> interference,the LCS recove is to be used to validate the batch. <br />' Project Manager <br /> 5060180.ALT <8> <br />