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` Sequoia 680 Ciesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <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)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 7-0137, 5150137 1300 <br /> 3468 Mt Diablo Blvd , Ste B100 <br /> Lafayette, CA 94549 <br /> IAttention Chrlsta Marting QC Sample Group 9804C34-04,08,09 Reported Apr 27, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015/8020 <br /> Analyst J Minkel <br /> ANALYTE Benzene Ethylbenzene Toluene Xylenes BTEX as TPH <br /> QC Batch # GC042398BTEX06A <br /> Sample No GW9804D26-3 <br /> Date Prepared 4/23/98 4123198 4123198 4123/98 4/23/98 <br /> Date Analyzed 4123198 4123198 4/23/98 4123198 4123198 <br /> Instrument 1 D # GCHP06 GCHP06 GCHP06 GCHP06 GCHPO6 <br /> Sample Cone , ug/L N D N D N D N D N D <br /> Cone Spiked u91L 10 10 10 30 60 <br /> Matrix Spike, ug1L 9 1 8 9 90 27 61 <br /> % Recovery 91 89 90 90 102 <br /> Matrix <br /> Spike Duplicate, ug/L 8 5 83 83 25 58 <br /> % Recovery 85 83 83 83 97 <br /> Relative % Difference 6 8 7 0 8 1 8 1 50 <br /> RPD Control Limits 025 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWBLK042398A <br />' Date Prepared 4123198 4/23/98 4123196 4/23198 4/23/98 <br /> Date Analyzed 4/23/98 4123/98 4/23198 4123198 4123198 <br /> Instrument 1 D # GCHP06 GCHP06 GCHP06 GCHP06 GCHP06 <br /> Cone Spiked ug/L 10 10 10 30 60 <br /> LCS Recovery ug/L 9 7 9 5 9 7 29 67 <br /> LCS % Recovery 97 95 97 97 112 <br /> Percent Recovery Control Limits <br /> MSIMSD 60140 60140 60140 60140 60140 <br /> LCS 70130 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 interferew free matrix that is analyzed using the same reagents <br /> SEQUOIA ANALYTICIL 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 /> L�yVO� the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Richard erling <br /> Project Manager <br />