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680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)364 9233 <br /> 1 Sequoia 404 N WiSet 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 /> 145c865 FAX(707)792-OM2 <br /> Analytical 1555 IndDowellustrial RoadBlvd North Ste D San lCarloslumaCCA 94070-41 1 1 (650)232-A 54954 (707)79219600 FAX(650)23Z-9612 <br /> Gettler-Ryan - Dublin Client Project ID Tosca #6981, Stockton <br /> 6747 Sierra Court, Suite J Matrix Vapor <br /> Dublin, CA 94568 <br /> Attention Steve Carter QC Sample Group 9042081-084 Reported May 13, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes MTBE <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Analyst C Westwater C Westwater C Westwater C Westwater N Nelson <br /> MS/MSO <br /> Batch# 10ONG BTEX 10ONG BTEX 10ONG BTEX 10ONG BTEX BLK042699 <br /> Date Prepared 4/24/99 4/24/99 4/24/99 4/24/99 4/26/99 <br /> Date Analyzed 4/24/99 4/24/99 4/24/99 4/24/99 4/26/99 <br /> Instrument I D # HP-2 HP-2 HP 2 HP-2 GC/MS 2 <br /> Conc Spiked 20ug/L 20yg/L 20Ng/L 60pg/L 50ug/L <br /> Matrix Spike <br /> % Recovery 75 65 65 75 78 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 95 85 90 93 78 <br /> Relative % <br /> Difference 24 27 32 22 00 <br /> LCS Batch# 2LCSO42699 2LCSO42699 2LCSO42699 2LCSO42699 - <br /> Date Prepared 4/26/99 4/26/99 4/26/99 4/26/99 <br /> Date Analyzed 4/26/99 4/26/99 4/26/99 4/26/99 <br /> Instrument I D # HP-2 HP-2 HP 2 HP-2 <br /> LCS % <br /> Recovery 89 78 89 95 <br /> %Recovery <br /> Control Limits 70-130 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 /> EDUGIA ANALYTIC L, #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 /> 1/1!2 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 /> J lianne Fegley <br /> rolect Manager <br /> 9042081 GET <4> <br />