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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)988 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 -Dublin Client Project Ib Tosco #6981, Stockton <br /> 6747 Sierra Court, Suite J Matrix Vapor <br /> Dublin, CA 94568 <br /> Attention Steve Carter QC Sample Group 9061621-622 Reported Jul 6, 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 J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# IOONG BTEX 10ONG BTEX 10ONG BTEX 10ONG BTEX <br /> Date Prepared 6/18/99 6/18/99 6/18/99 6/18/99 <br /> Date Analyzed 6/18/99 6/18/99 6/18/99 6/18/99 <br /> Instrument I D # HP 2 HP-2 HP-2 HP-2 <br /> Conic Spiked 2 0 pg/L. 2 0 ug/L 2 0 Ng/L 6 Oyg/L <br /> Matrix Spike <br /> % Recovery 80 70 75 82 <br /> Of <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 75 65 75 72 <br /> Relative% <br /> Difference 65 74 00 13 <br /> LCS Batch# 2LCS062199 2LCS062199 2LCS062199 2LCS062199 <br /> Date Prepared 6/21/99 6/21/99 6/21/99 6/21/99 <br /> Date Analyzed 6/21/99 6/21/99 6/21/99 6/21/99 <br /> Instrument I D # HP-2 HP-2 HP-2 HP 2 <br /> LCS % <br /> Recovery 95 90 100 100 <br /> L °° Recovery <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 /> tEGUOIA 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 recove is to be used to validate the batch <br /> anne Fegley <br /> Project Manager <br /> 9061621 GET <2> <br />