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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9Z33 <br /> 404 N Wiget Lane Walnut Creek.CA 94598 (510)988 9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue Suite 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) 792-0342 <br /> EA Engineering Client Project ID Exxon 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd, Ste B100 <br /> Lafayette, CA 94549 <br />' Attention Christa Marting QC Sample Group 9805E41-10 Reported Jun 10, 1998 <br /> QUALITY CONTROL DATA REPORT <br />' Matrix Liquid <br /> Method EPA 8020 <br /> Analyst C Medina <br />' ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GCO604986TEX03A <br />' Sample No GW9805H15-3 <br /> Date Prepared 614198 614198 614198 614198 <br /> Date Analyzed 614198 614198 614198 614198 <br />' instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Sample Conc , ug/L N D N D N D N D <br /> Conc Spiked, ug/L 10 10 10 30 <br />' Matrix Spike, ug/L 9 1 9 1 g 2 28 <br /> % Recovery 91 91 92 93 <br /> Matrix <br /> Spike Duplicate, ug/L 7 3 7 3 7 4 22 <br /> % Recovery 73 73 74 73 <br />' Relative % Difference 22 22 22 24 <br />' RPD Control Limits 025 0 25 0-25 0-25 <br /> LCS Batch# GWBLK060498ABS <br />' Date Prepared 614198 614198 614198 614198 <br /> Date Analyzed 614198 614198 614198 614198 <br /> instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br />' Gone Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 8 9 9 0 9 0 27 <br />' LCS % Recovery 89 90 90 90 <br /> Percent Recovery Control Limits <br /> MSlMSD 60140 60140 60140 60140 <br />' LCS 70130 70130 70130 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 /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recover is to be used to validate the batch <br /> Ri hard Herling <br /> Project Manager <br />