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n I Y fA <br /> 1 680 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 /> Blaine Tech Services Client Project ID Shell 4445 Pershing Ave <br /> 1680 Rogers Ave <br /> San Jose, CA 95112 <br /> Attention Fran Thie QC Sample Group 9810126-01 Reported Nov 15 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 _ <br /> Analyst MM/GR <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch# GC1 1 1098STEX30A <br /> Sample No GW981OL26-3 <br /> Date Prepared 11/10/98 11/10/98 11/10/98 11/10/98 <br /> Date Analyzed 11/10/98 11/10/98 11/10/98 11/10/98 <br /> Instrument I D# GCHP30 GCHP30 GCHP30 GCHP30 <br /> Sample Conc , ug/L. N D N D N D N D <br /> Conc Spiked, ug/L 10 10 10 30 <br /> Matrix Spike, ug/L 11 11 11 33 <br /> % Recovery 109 108 111 110 • <br /> Matrix <br /> pike Duplicate, ug/L 10 10 11 32 <br /> % Recovery 104 104 106 106 <br /> elative % Difference 47 38 46 37 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GC111098BTEX30A <br /> Date Prepared 11/10/98 11/10/98 11/10/98 11/10/98 <br /> Date Analyzed 11/10/98 11/10/98 11/10/98 11/10/98 <br /> Instrument I D# GCHP30 GCHP30 GCHP30 GCHP30 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 89 90 91 27 <br /> LCS % Recovery 89 90 91 92 <br /> Percent Recovery Control Limits <br /> MSIMSD 60-140 60-140 60140 60140 <br /> LCS 70130 70-130 70130 70130 <br /> Quality Assurance 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 /> fnn <br /> N YTICALpreparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fort�fiied with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> - the recovery of analytes from the matrix spike goes not tall within specrfied control limits due to matrixinte ce the LCS recovery is to be used to validate the batch <br /> P gy Pr <br /> Pr ectger p <br /> .P� <br />