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Sequoia 404 N CA L598 <br /> Walnut Creek, <br /> CA 4459$ <br /> (925)9$$-9600 <br /> — - <br /> A �� ���� - -- FAX(92S)988-9673 - - <br /> f} v. v �G v ♦ ..y.% vry.}[ <br /> Gettler-Ryan -Dublin Client project Iii Unocal Circlie K 8'8#1205, Lathrop �} <br /> v 6747 Sierra Court, Suite J Matrix Liquid <br /> ' Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9071248-252 Reported Aug 3, 1999-- <br /> -QUALITY-CONTROL-DATA-REPORT— <br /> ANALYTE <br /> 999n-QUALITY-CONTROL--DATA-REPORT—ANALYTE Benzene Toluene Ethyl Xylenes MTBE <br /> Benzene { <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> ...y <br /> Analyst: C Westwater C Westwater C Westwater C Westwater N Nelson ! <br /> MS/MSD <br /> Batch#: 9071237 9071237 9071237 9071237 9071302 <br /> Date Prepared. 7/26/99 7/26/99 7/26/99 7/26/99 7/30/99 <br /> Date Analyzed: 7/26/99 7/26/99 7/26/99 7/26/99 7/30/99 <br /> Instrument I D.#- HP-4 HP-4 HP-4 HP-4 GC/MS-2 <br /> Conc Spiked 20 ftg/L 20Ng/L 20ug/L 60Ng/L 50Mg/L <br /> Matrix Spike <br /> % Recovery, 115 100 100 113 115 <br /> Matrix Spike <br /> Duplicate % . <br /> Recovery 115 100 100 112 128 <br /> Relative % <br /> Difference, 00 00 00 is 10 <br /> LCS Batch#• 4LCS072699 4LCS072699 4LCS072699 4LCS072699 LCS073099 <br /> Date Prepared: 7/26/99 7/26/99 7/25/99 7/26/99 7/30/99 <br /> Date Analyzed: 7/26/99 7/26/99 7/26/99 7/26/99 7/30/99 <br /> Instrument I D.#- HP-4 HP-4 HP-4 HP-4- GC/IVES-2 <br /> LCS % <br /> Recovery: 115 100 100 115 118 <br /> Recovery <br /> Control Limits: 70-130 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 /> SEQUOIA 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 /> 1/n.L 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 /> lianne Fegley <br /> Project Manager <br /> ---- - — , , ----� 9071248 GET-<7> <br /> plc <br /> `may' <br />