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, <br /> � � � sapeake Drive Redwood City CA 94 (650)364-9600 FAX(650)364-9233 <br /> *Wget Lane Walnut Creek.CA 945 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> naly tical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-18455 FAX(707)792-0342 <br /> Blaine Tech Services Client Project ID Shell 341 East Main St <br /> 1680 Rogers Ave <br /> San Jose, CA 95112 <br /> Attention Fran Thle QC Sample Group 9811 E55-01 Reported Dec 6, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst MM <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch# GC120298BTEX03A <br /> Sample No GW9811 H31-1 <br /> Date Prepared 1212198 1212198 1212198 1212198 <br /> Date Analyzed 1212198 1212198 1212198 1212198 <br /> Instrument I D# GCHP03 GCHP03 GCHP03 GCHP03 <br /> I <br /> Sample Conic, uglL N D N D N D N D <br /> Conc Spiked, uglL 10 10 10 30 <br /> Matrix Spike, uglL 9 5 100 100 32 <br /> % Recovery 95 1000 1000 107 <br /> Matrix <br />.pike Duplicate, uglL 99 100 100 31 <br /> %Recovery 99 1000 1000 103 <br /> elative% Difference 41 00 0 0 3 8 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GC120298BTEX03A <br /> Date Prepared 1212198 12/2198 1212198 12/2198 <br /> Date Analyzed 1212198 12/2198 1212198 1212198 <br /> Instrument I D# GCHP03 GCHP03 GCHP03 GCHP03 <br /> Conc Spiked, uglL 10 10 10 30 <br /> LCS Recovery, ug1L 99 100 11 32 <br /> LCS% Recovery 99 1000 110 107 <br /> Percent Recovery Control Limits <br /> MS/MSD 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Quality Assnce:Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> SE I A CA 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 /> Peggy Penner <br /> Project Manager <br />