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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wlget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)968-9673 <br /> Analytical S19 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 /> EA ENGINEERING Client Project ID EXXON 7-0137, 5150137 1300 <br /> 3468 Mt Diablo Blvd Ste 8100 <br /> Lafayette CA 94549 <br />' Attention Christa Martin9 QC Sample Group 981OC43 Reported Nov 3 1998 <br /> QUALITY CONTROL DATA REPORT <br />' Matrix Liquid <br /> Method EPA 8015 <br /> Analyst MM <br />' ANALYTE Gasoline <br />' QC Batch # GC102198BTEX30A <br /> Sample No GW9810105-4 <br /> Date Prepared 10/21/98 <br />' Date Analyzed 10/21/98 <br /> Instrument I D # GCHP30 <br /> Sample Conc , ug/L N D <br /> Conc Spiked, ug/L 250 <br /> Matrix Spike, ug/L 280 <br /> % Recovery 113 <br /> Matrix <br /> Spike Duplicate, ug/L 270 <br /> % Recovery 107 <br /> Relative % Difference 5 5 <br />' RPD Control Limits 0-25 <br /> LCS Batch# GC102198BTEX30A <br />' Date Prepared 10/21/98 <br /> Date Analyzed 10/21/98 <br /> Instrument I D# GCHP30 <br />' Conc Spiked, ug/L 250 <br /> LCS Recovery, ug/L 290 <br />' LCS % Recovery 117 <br /> Percent Recovery Control Limits <br />' <br /> 11S11ASD 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 /> rr the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recove is to be used to validate the batch <br /> ei Mei Shin <br /> Project Manager <br /> 1 <br />