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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> CD 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(9Z5)988-9673 <br /> 111W Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)9Z1-9600 FAX(916)921.-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)79Z-0342 <br /> Tech Services Client Project 1D Shell 2575 Country Club Blvd <br /> 1680 Rogers Ave <br /> San Jose, CA 95112 <br /> BlaineAttentlon I=ran Thle QC Sample Group 9810742-13-14 Reported Oct 27, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst MM <br /> ANALYTE Gasoline <br /> QC Batch# GC101698BTEX03A <br /> Sample No GW9810630-7 <br /> Date Prepared 10/16/98 <br /> Date Analyzed 10/16/98 <br /> Instrument I D# GCHP03 <br /> Sample Conc , ug1L N D <br /> Conc Spiked, ug/L 250 <br /> Matrix Spike, ug/L 240 <br /> %Recovery 96 <br /> Matrix <br /> pike Duplicate, ug1L 260 <br /> %Recovery 104 <br /> elative% Difference so <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWLCS101698A <br /> Date Prepared 10/16/98 <br /> Date Analyzed 10/16/98 <br /> Instrument I D# GCHP03 <br /> Conc Spiked, ug1L 250 <br /> LCS Recovery, ug1L 230 <br /> LCS% Recovery 92 <br /> Percent Recovery Control Limits <br /> MSIMSD 60140 <br /> LCS 70-130 <br /> Quality Assur nce 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 matnx that is analyzed using the same reagents <br /> I A LYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> 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 /> egg Penner <br /> ct Manager <br />