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' r ■ 6110 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> Sequoia <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510)988 9600 FAX(510)988 9673 <br /> Analytical 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)911 Woo <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792 1665 FAX(707)792 0342 <br /> 6 <br />' EA Engineering Client Project ID Exxon 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd, Ste B100 <br /> Lafayette, CA 94549 QC Sample Group 9805E41-08 <br />' Attention Chrlsta Marting 9805E43-23 Reported Jun 10, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst N Herrera <br /> IANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC060298BTEX21 A <br /> ISample No GW9805E41-5 <br /> Date Prepared 612/98 6/2/98 6/2/98 6/2198 <br /> Date Analyzed 612198 612/98 612198 612/98 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Sample Conc , ug1L N D N D N D N D <br /> Conc Spiked, ug1L 10 10 10 30 <br /> Matrix Spike, ug/L 11 9 5 9 3 27 <br /> % Recovery 110 95 93 90 <br /> Matrix <br /> Spike Duplicate, ug/L 11 9 7 9 6 29 <br /> % Recovery 110 97 96 97 <br /> Relative % Difference 0 0 2 1 3 2 7 5 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWBLK060298ABS <br /> Date Prepared 612/98 612198 6/2/98 612/98 <br /> Date Analyzed 612198 6/2/98 6/2/98 6/2/98 <br /> Instrument 1 0 # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 10 10 10 31 <br /> LCS % Recovery 100 100 100 103 <br /> Percent Recovery Control Limits <br /> MS/MSD 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 /> V ' <br /> 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 /> Richard Herling <br /> Project Manager <br /> 1 <br />