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1� <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 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 /> Attler-Ryan- Dublin Client Protect ID Unocal S8#5886, Stockton <br /> 47 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9030233-244 Reported Mar 24, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene <br /> Toluene Ethyl Xylenes Diesel MTBE <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M EPA 8260 <br /> Analyst J Minkei J Minkel J Minkel J Minkel K Grubb N Nelson <br /> MS/MSD <br /> Batch# 9030368 9030368 9030368 9030368 BLK0304998 9031104 <br /> Date Prepared 3/10/99 3/10/99 3/10/99 3/10/99 3/4/99 3/14/99 <br /> Date Analyzed 3/10/99 3/10/99 3/10/99 3/10/99 3/8/99 3,14/99 <br /> Instrument I D # HP 2 HP 2 HP-2 HP 2 HP 3B GC/MS 2 <br /> Conc Spiked 20Ng/L 20Ng/L 20ug/L 60pg/L 500ug/L 50,ug/L <br /> Matrix Spike <br /> % Recovery 100 95 100 102 82 98 <br /> f <br /> + <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 95 90 95 102 74 98 <br /> Relative % <br /> Difference 51 54 51 00 10 100 <br /> LCS Batch# 2LCS031099 2LCS031099 2LCS031099 2LCS031099 LCS030499B LCS031499 <br /> Date Prepared 3/10/99 3/10/99 3/10/99 3/10/99 3/4/99 3/14/99 <br /> Date Analyzed 3/10/99 3/10/99 3/10/99 3/10/99 3/8/99 3/14/99 <br /> Instrument I D # HP 2 HP 2 HP-2 HP 2 HP 3B GC/MS-2 <br /> LCS % <br /> Recovery 100 95 100 108 86 102 <br /> ecovery <br /> Control Limits 70-130 70-130 70-130 70 130 60-140 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 /> yL,L the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Jyt interference,the LCS recovery is to be used to validate the batch <br /> L#ullanne Fegley <br /> IV Project Manager <br /> 9030233 GET <20> <br />