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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)9BB-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707) 792-0342 <br /> 1551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232 9612 <br /> �Gettler Ryan, Inc Client Project ID USS ,Stockton #1140124 <br /> 3164 Gold Camp Drive, #240 Matrix Vapor <br /> Rancho Cordova, CA 95670 <br /> Attention Steve Carter QC Sample Group 990-4483 Reported Apr 30, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD <br /> Batch# 10ONGSTEX 10ONGBTEX 10ONGBTEX 100NGBTEX <br /> Date Prepared 4/15/99 4/15/99 4/15/99 4/15/99 <br /> Date Analyzed 4/15/99 4/15/99 4/15/99 4/15/99 <br /> Instrument I D # HP 2 HP-2 HP-2 HP-2 <br /> Cone Spiked 2 0 2 0 20 2 0 mg/kg <br /> Matrix Spike <br /> % Recovery 80 75 80 85 <br /> Matrix Spike 80 70 75 82 <br /> Duplicate % <br /> Recovery <br /> Relative % 0 0 6 9 65 4 0 <br /> Difference <br /> LCS Batch# 2LCSO42199 2LCSO42199 2LCSO42199 2LCSO42199 <br /> Date Prepared 4/21/99 4/21/99 4/21/99 4/15/99 <br /> Date Analyzed 4/21/99 4/21/99 4/221/99 4/15/99 <br /> Instrument I D # HP 2 HP 2 HP 2 HP 2 <br /> LCS % <br /> Recovery 90 85 90 97 <br /> ecovery <br /> Control Limits 70-130 70.130 70-130 70-130 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA 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 /> interference,the LCS recovery is to be used to validate the batch <br /> lianne Fegley <br /> Project Manager <br /> 9041730 GGG <2> <br />