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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-%W FAX(650)364-9233 <br /> 404 N Wlget lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> �VII� Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ler-#cyan=Dublin Client Project ID Unocal Circle K SS#1205, Lathrop <br /> 47 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9011723-727 Reported Feb 9, 1999 <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# 9011618 9011618 9011618 9011618 <br /> Date Prepared 2/3/99 2/3/99 2/3/99 2/3/99 <br /> Date Analyzed 2/3/99 2/3/99 2/3/99 2/3/99 <br /> Instrument I D # HP 9 HP 9 HP 9 HP-9 <br /> Conc Spiked 20 erg/L 20 Ng/L 20/ig/L 60 Frg/L <br /> Matrix Spike <br /> % Recovery 105 105 105 110 <br /> • Matrix Spike <br /> Duplicate % <br /> Recovery- too 100 100 105 <br /> Relative % <br /> Difference 4 9 49 4 9 4 7 <br /> LCS Batch# 9LCS020399 9LCS020399 9LCS020399 9LCS020399 <br /> Date Prepared 2/3/99 2/3/99 2/3/99 2/3/99 <br /> Date Analyzed 2/3/99 2/3/99 2/3/99 2/3/99 <br /> Instrument I D # HP-9 HP-9 HP 9 HP-9 <br /> LCS % <br /> Recovery 105 105 105 110 <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 /> 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 /> 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 /> u anne Fegley <br /> roject Manager <br /> 9011723 GET <3> <br />