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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 , <br /> q 404 N Wiget Lane Walnut Creek.CA 94598 (510)988-9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-010 0 <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 2494 Fremont • <br /> 1680 Rogers Ave <br /> San Jose, CA 95112 <br /> Attention Fran Thle QC Sample Group 9805902-02-04 Reported May 27 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst <br /> ANALYTE Gasoline <br /> QC Batch# GC052298BTEX06A <br /> Sample No GW9805711-3 <br /> Date Prepared 5/22/98 <br /> Date Analyzed 5/22/98 <br /> Instrument I D# GCHP06 <br /> Sample Conc, ug/L N D <br /> Conc Spiked, ug/L. 250 <br /> Matrix Spike,ug/L 230 <br /> % Recovery 92 <br /> Matrix • <br /> pike Duplicate, ug/L 220 <br /> % Recovery 88 <br /> elative% Difference 44 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWBLK052298A <br /> Date Prepared 5122198 <br /> Date Analyzed 5122198 <br /> Instrument i D#—GCHP_06 <br /> Conc Spiked, ug/L 250 <br /> LCS Recovery, ug/L 230 <br /> LCS% Recovery 92 <br /> Percent Recovery Control Limits <br /> F- <br /> MSIMSD 60140 <br /> LCS 70 130 <br /> ict <br /> ur 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 /> AN LYTICAL 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 /> ner <br /> nager <br />