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' <br /> Sequoia <br /> �Q y y O � 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364 9233 <br /> J - u 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue 5uite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707) 792-1865 FAX(707)792-034Z <br /> EA Engineering Client Project ID Exxon 7 0137, 5150137 1300 <br /> 3468 Mt Diablo Blvd, Ste B100 <br /> Lafayette, CA 94549 <br />' Attention Christa Marting QC Sample Group 9807D08-01,02 Reported Aug 3 1998 <br /> QUALITY CONTROL DATA REPORT <br />' Matrix Liquid <br /> Method EPA 8015 <br />' ANALYTE Gasoline <br />' QC Batch # GC072998BTEX21A <br /> Sample No GW9807E66-03 <br /> Date Prepared 7129198 <br /> Date Analyzed 7129198 <br /> Instrument I D # GCHP21 <br /> Sample Cone ug/L N D <br /> Cone Spiked ug/L 250 <br /> Matrix Spike ug/L 270 <br /> % Recovery 108 <br /> Matrix <br /> Spike Duplicate ug/L 280 <br /> % Recovery 112 <br /> Relative % Difference 3 6 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWBLK0729911AS <br /> Date Prepared 7129198 <br /> Date Analyzed 7129198 <br /> I Instrument I D # 13CHP21 <br /> Cone Spiked ug/L 250 <br /> LCS Recovery, u911 270 <br /> LCS % Recovery 108 <br /> Percent Recovery Control Limits <br /> = MS/MSD 60140 <br /> --LCS 70 130 <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 /> SEQUOIA ANALYTICAL 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 /> 2interference the LCS recovery is to be used to validate the batch <br /> Richard Herling <br /> Project Manager <br /> f <br />