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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364 9233 <br /> 404 N Wiger Lane Walnur Creek CA 94598 (510)988 9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 79Z-1865 FAX(707)792 0342 <br /> EA Engineering Client Project ID Exxon 7-3942 5153942 1300 <br /> 3468 Mt Diablo Blvd, Ste 8100 <br /> Lafayette, CA 94549 <br />' Attention Christa Marting QC Sample Group 9805E43-21,22 Reported Jun 10 1998 <br /> QUALITY CONTROL DATA REPORT <br />' Matrix Liquid <br /> Method EPA 8015 <br /> Analyst N Herrera <br />' ANALYTE Gasoline <br /> QC Batch # GC060198BTEX03A <br />' Sample No GW9805C77-16 <br /> Date Prepared 611198 <br /> Date Analyzed 611198 <br /> Instrument I D # GCHP03 <br /> Sample Conc , ug/L N 0 <br /> Conc Spiked ug/L 250 <br />' Matrix Spike ug/L 200 <br /> % Recovery 80 <br /> Matrix <br /> Spike Duplicate, ug!! 200 <br /> % Recovery 80 <br />' Relative % Difference 00 <br />' RPD Control Limits 0-25 <br /> LCS Batch# GWBLK06019BABS <br />' Date Prepared 611/98 <br /> Date Analyzed 6/1/98 <br /> Instrument I D # GCHP03 <br />' Conc Spiked, ug/L 250 <br /> LCS Recovery, ug/L 200 <br /> LCS % Recovery 80 <br /> Percent Recovery Control Limits <br /> MS1MSD 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 ANALYTICA 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 enure analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due 10 matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Richard Herling r <br /> Project Manager <br />