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i y <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)98S-9673 <br /> Analytical 819Striker Avenue Suite Sacramento CA 95834 (916)9Z I-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Wfei-Ayan =bublin Clientproject ID Unocal 88#0187, Stockton "V V <br /> 6747 Sierra Court, Suite J Matrr< Liquid n <br /> Dublin, CA 94568 <br /> '?Attention Deanna Harding QC Sample Group 9020651-668 Reported Feb 16, 1999 > <br /> .`OwS�Mn Cth � v r ';Ji ri vvv ,... r [ `� ^ , � , n {r� ur{ r ♦v v v r r ♦♦ Ar ,,. ,. "�,. ," ,r ' O v , , .,lNrr <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst- C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD <br /> Batch#. 9020373 9020373 9020373 9020373 <br /> Date Prepared 2/10/99 2/10/99 2/10/99 2/10/99 <br /> Date Analyzed 2/10/99 2/10/99 2/10/99 2/10/99 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20pg/L 20ltg/L 20Ng/L 60yg/L <br /> Matrix Spike <br /> % Recovery 95 90 95 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 95 90 95 100 <br /> Relative% <br /> Difference. 00 00 00 00 <br /> LCS Batch#: 2LCS021099 2LCS021099 2LCS021099 2LCS021099 <br /> Date prepared 2/10/99 2/10/99 2/10/99 2/10/99 <br /> Date Analyzed 2/10/99 2/10/99 2/10/99 2/10/99 <br /> Instrument I D # HP-2 HP 2 HP-2 HP-2 <br /> LCS % <br /> Recovery. 95 90 95 102 <br /> Recovery <br /> Control Limits: 70-130 70-130 70-130 70-130 <br /> Please Note <br /> The LCS is a control sample of known,Interferent free matrix that is analyzed using the same reagents, <br /> DUO!A ANALYTICAL, #1271 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 recoveryis to be used to validate the batch <br /> Julianne Fegley <br /> Project Manager <br /> 9020651 GET <22y <br />