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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)988-9673 <br /> Analytical 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)92t-9600 FAX(916)921 0100 <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 Chnsta Marting QC Sample Group 9810043 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 # GC102198BTEX17A <br /> Sample No GW9810105-4 <br /> Date Prepared 10/21/98 <br /> Date Analyzed 10/21/98 <br /> Instrument I D # GCHP17 <br /> Sample Conc , ug/L N D <br />' Conc Spiked ug/L 250 <br /> Matrix Spike ug/L 250 <br /> % Recovery 99 <br /> Matrix <br /> Spike Duplicate ugfL 250 <br /> % Recovery 98 <br />' Relative % Difference 1 0 <br />' RPD Control Limits 0-25 <br />' LCS Batch# GC102198BTEX17A <br /> Date Prepared 10/21/98 <br /> Date Analyzed 10/21/98 <br /> Instrument i D # GCHP17 <br /> Conc Spiked, ug/L 250 <br />' LCS Recovery ug/L 250 <br /> LCS % Recovery 98 <br /> Percent Recovery Control Limits <br />' MSIMSO 60140 <br /> LCS 70130 <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 /> Vti 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 /> Mei Mei Shin <br /> Project Manager <br />