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680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650) 364-9233 <br /> Sequoia <br /> `..� 404 N Wger lane Walnut Creek CA 94598 (510)988 9600 FAX(510)988-9673 <br /> Analytical 819 Srrrker Avenue Suite B Sacramento CA 95834 (916)921 9600 FAX(916)921-0100 <br /> 1455"'cDowelt Blvd North Ste D Peralum&CA 94954 (707)792 1865 FAX(707) 79Z-0342 <br /> 6 <br />' EA Engineering Client Project ID Exxon 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd Ste 8100 <br /> Lafayette, CA 94549 QC Sample Group 9805E41-01,13-15 <br />' Attention Chrlsta Marting 9805E4E43-20 Reported Jun 10, 1998 <br /> QUALITY CONTROL DATA REPORT <br />' Matrix Liquid <br /> Method EPA 8020 <br /> Analyst N Herrera <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC060298BTEX03A <br />' Sample No GW9805E43-6 <br /> Date Prepared 612/98 6/2198 612198 612198 <br /> Date Analyzed 612198 6/2/98 612198 612198 <br />' Instrument I D # GCHP3 GCHP3 GCHP3 GCHP3 <br /> Sample Cone , ug/L N D N D N D N D <br /> Cone Spiked, ug/L 10 10 10 30 <br /> Matrix Spike, ug/L 86 8 7 8 9 27 <br /> % Recovery 86 87 89 90 <br /> Matrix <br /> Spike Duplicate uglL $ 7 8 9 9 0 27 <br /> % Recovery 87 89 90 90 <br /> Relative % Difference 1 2 2 3 1 1 0 0 <br /> RPD Control Limits 0 25 0 25 0-25 0-25 <br /> LCS Batch# GWBLK060298ABS <br />' Date Prepared 6/2198 6/2/98 61219$ 612198 <br /> Date Analyzed 6/2198 6/2/98 612/98 6/2198 <br /> Instrument I D # GCHP3 GCHP3 GCHP3 GCHP3 <br />' Cone Spiked ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 9 7 9 9 10 30 <br />' LCS % Recovery 97 99 100 100 <br /> Percent Recovery Control Limits <br /> MSlMSO 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 tnterferent 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 /> VR�Pchard <br /> the recovery of analytes from the matinnx sp ke does not fall within specified control limas due to matrix <br /> terference the LCS recovery is to be used to validate the batch <br /> Herling <br /> Project Manager <br />