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Sequoia 680 Chesapeake 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 /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-010 0 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal 6981, 140124 02 <br /> 3164 Guid Camp Dave, #240 <br /> rtanch�) Cordova, CA 95670 <br /> Atwi von Steve Carter QC Sample Group 9804D87-01,02 Repo ted Apr 29, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> — ^----iMatrix Liquid – -- --- --� <br /> Method EPA 8015/8020 I <br /> Analyst C Demartini <br /> ANALYTE Benzene Ethylbenzene Toluene Xylenes BTEX as TPH <br /> OC Batch # GC042398BTEX21A <br /> Sample No 9804C73-1 <br /> Date Prepared 4123198 4123198 1123198 4123198 4/23198 <br /> Date Analyzed 4123198 4/23198 4123198 4123198 4123/98 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Sample Cone ug1L N D N D N D N D N D <br /> Cone Spiked, u91L 10 10 10 30 60 <br /> Matrix Spike, ug/L 10 10 10 31 63 <br /> % Recovery 100 100 100 103 105 <br /> Matrix <br /> Spike Duplicate, ug/L 10 10 11 31 65 <br /> % Recovery 100 100 110 103 108 <br /> Relative % Difference 00 0 0 9 5 00 2 8 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 025 <br /> LCS Batch# BLK042398 <br /> Date Prepared 4123198 4123198 4123198 4123198 4/23/98 <br /> Date Analyzed 4123198 4/23198 4123198 4123198 4/23/98 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked, ug/L 10 10 10 30 60 <br /> LCS Recovery ug/L 10 10 10 31 62 <br /> LCS % Recovery 100 100 100 103 103 <br /> Percent Recovery Control Limits <br /> MS/MSE) 60 140 60 140 60 140 60 140 60 140 <br /> LCS 70130 70 130 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 /> SEQU7ALYTICAL 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 /> Gregory <br /> roject Manager <br />