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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> Ci) <br /> 404 N Wlget Lane Walnut Creek.CA 94598 (915)988-9600 FAX(925)988-9673 <br /> CIII� Analytical 8t9 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX 916921 -0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 707 792-1865 FAX(707)792-0342 <br /> Blaine Tech Services Client Project ID Shell 2575 Country Club Blvd <br /> 1680 Rogers Ave <br /> San Jose, CA 95112 <br /> Attention Fran Thle QC Sample Group 9810737-04, 741-12 Reported Oct 27, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst AM <br /> ANALYTE Benzene Toluene Ethyibenzene Xylenes <br /> QC Batch# GC101798BTEX03A <br /> Sample No GW981OA18-11 <br /> Date Prepared 10/17/98 10/17/98 _ 10/17/98 10/17/98 <br /> Date Analyzed 10/17/98 10/17/98 10/17/98 10/17/98 <br /> Instrument I D# GCHP03 GCHP03 GCHP03 GCHP03 <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, uglL 11 11 11 32 <br /> %Recovery 110 110 110 107 <br /> Matrix <br /> pike Duplicate,ug/L 11 11 100 32 <br /> % Recovery 110 110 1000 107 <br /> I <br /> elative% Difference 00 00 9 5 00 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GC101798BTEX03A <br /> Date Prepared 10/17/98 10/17/98 10/17/98 10/17/98 <br /> Date Analyzed 10/17/98 10/17/98 10/17/98 10/17/98 <br /> Instrument I D# GCHP03 GCHP03 GCHP03 GCHP03 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 9 5 91 91 28 <br /> LCS% Recovery 95 91 91 93 <br /> Percent Recovery Control Limits <br /> F- <br /> MSIMSD 60140 60-140 60140 50140 <br /> 70-130 70-130 70130 70-130 <br /> Quality ura a 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 A ration and analytical methods employed for the samples The matnx spike is an aliquot of sample <br /> fortified with known quantities of spetxfic 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 matnx <br /> interference the LCS recovery is to be used to validate the batch <br /> Pe Penner <br /> Project Manager <br />