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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650) 364-9233 <br /> 404 N Wrget Lane Walnut Creek CA 94598 (510)988 9600 FAX(510)988 9673 <br /> 819 Straker Avenue Suue 8 Sacramento CA 95834 (9t6)921 9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792-1865 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 Marling QC Sample Group 9805E41-12,16-19 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 # GC060398BTEX21 A <br />' Sample No GW9805E41-10 <br /> Date Prepared 613198 <br /> Date Analyzed 613198 <br />' Instrument I D # GCHP21 <br /> Sample Conc , uglL N D <br /> Conc Spiked uglL 250 <br />' Matrix Spike, uglL 210 <br /> Recovery 84 <br /> Matrix <br /> Spike Duplicate uglL 230 <br /> % Recovery 92 <br /> IRelative % Difference 9 1 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWBLK060398A <br /> Date Prepared 613198 <br /> Date Analyzed 613198 <br /> Instrument I D # GCHP21 <br />' Conc Spiked, uglL 250 <br /> LCS Recovery, uglL 220 <br />' LCS % Recovery 88 <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 tall within specified control limits due to matrix <br /> RicharZ d Heeling interference the LCS recover is to be used to validate the batch <br /> Project Manager <br />