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a— )• 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX t650) 364-9233 <br /> Sequoia 4134 N 1,101get lane Walnut Creek. CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0100 <br /> qQr 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707) 792 ;865 FAX(707) 792-0342 <br /> Gettler Ryan/Geostrategles Client Project ID Unocal SS#0123 <br /> 6747 Sierra Court Ste J <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9809H50 Reported Nov 25, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 801018020, 601/602 <br /> Analyst L Kim <br /> ANALYTE 1 1-0CE TCE Chlorobenzene Benzene Toluene Chiarobenzene <br /> QC Hatch # GC1006980VCA32A <br /> Sample No 9809127-23 <br /> Cidtn Prerpurau 1006193 11016/98 1016198 1016198 10/6190 1016/98 <br /> Date Analyzed 10/6/98 10/6198 10/6/98 1016/98 1016198 1016/98 <br /> Instrument I D# gchp32 gchp32 gchp32 gchp32 gchp32 gchp32 <br /> Sample Conc , ug/L N D N D N D N D N 0 N D <br /> Conc Spiked, ugll. 25 25 25 25 25 25 <br /> Matrix Spike, ug/L 27 28 30 28 28 27 <br /> % Recovery 108 112 120 1012 1 12 108 <br /> Matrix <br /> Spike Duoltcate, ug/L. 26 29 29 27 27 27 <br /> % Recovery 104 116 116 108 108 108 <br /> Relative % Difference 3 8 3 5 3 4 3 6 3 6 00 <br /> RPD Control Limits 0-50 0-50 0-50 0-50 0-50 0-50 <br /> LCS Batch# LCS100698A <br /> Date Prepared 10/6/98 1016198 10/6/98 10/6198 1016198 1016/98 <br /> Date Analyzed 1016/98 1016198 10/6/98 1016/98 10/6/98 10/6/98 <br /> Instrument I D # gchp32 gchp32 gchp32 gchp32 gchp32 gchp32 <br /> Conc Spiked, ug/L 25 25 25 25 25 25 <br /> Recovery, ug/L 26 28 29 27 27 27 <br /> LCS % Recovery 104 112 116 108 108 108 <br /> Percent Recovery Control Limits <br /> MSIMSD 60140 60140 60140 60140 60140 60140 <br /> LCS 65135 70130 70130 70130 70-130 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 /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> Tod Grarncher interference the LCS recovery is to be used to validate the batch <br /> Project Manager <br />