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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9680 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek,CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)911-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Blaine Tech Services Client Project ID Chevron 9-8264198 1 5 24-,,2 <br /> 1680 Rogers Avenue <br /> San Jose CA 95112 <br /> Attention Christine Lillie QC Sample Group 9811 H50-01 Reported Dec 11, 1998 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8010/8020 6011602 <br /> I <br /> Analyst C Medina <br /> i <br /> ANALYTE 1 1--OCE TCF Chlorobenzene Benzene Toluene Chlorobenzene <br /> QC Batch # GC1204980VOA32A <br /> Sample No 9811 G83-03 <br /> Date Prepared 1213198 12!3!98 1213/98 1213198 1213198 1213198 <br /> Date Analyzed 1214198 1214198 1214!98 1214!98 1214198 1214198 <br /> instrument I D # gchp32 gchp32 gchp32 gchp32 gchp32 gchp32 <br /> Sample Conc ug1L N D 0 8 N D N D N D N D <br /> Conc Spiked ug/L 25 25 25 25 25 25 <br /> Matrix Spike ug/L 25 26 27 19 18 19 <br /> % Recovery 100 101 108 76 7> 76 <br /> Matrix <br /> Spike Duplicate uglL 25 25 2 19 18 19 <br /> % Recovery 100 97 7 04 76 72 76 <br /> Relative % Difference 00 40 3 8 00 00 00 <br /> RPD Control Limits 0-50 0 50 0-50 0-50 0-50 0 50 <br /> LCS Batch# VWLCS120498A <br /> Date Prepared 1214/98 1214198 1214198 1214!98 1214198 1214198 <br /> Date Analyzed 12/4/98 1214198 12/4/98 1214!98 12/4/98 1214198 <br /> Instrument 1 D # gchp32 gchp32 gchp32 gchp32 gchp32 gchp32 <br /> Conc Spiked, ug1L 25 25 25 25 25 25 <br /> Recovery, u91L 25 25 25 19 18 18 <br /> LCS % Recovery 100 100 100 76 72 72 <br /> Percent Recovery Control Limits <br /> IVIS/MSD 60140 60140 60 140 60 140 60 140 60140 <br /> LCS 65135 70130 70 130 70 130 70 130 70130 <br /> Quality Assurance Statement Ali standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LC5 is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> SEQUOIA YTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> forahed with known quantities of specific compounds and subjected to the entire anaiytical procedure If <br /> f 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 /> regory <br /> rolect Manager <br />