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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste a Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> tler-Ryan - Dublin Client Project 10 Tosco 88#6981, Stockton <br /> 6747 Sierra Court, Suite J Matrix Vapor <br /> Dublin, CA 94568 <br /> Attention Steve Carter OC Sample Group 8122475-476 Reported Jan 14, 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# 100 NG BTEX 100 NG BTEX 100 NG BTEX 100 NG BTEX <br /> Date Prepared 12/31/98 12/31/98 12/31/98 12/31/98 <br /> Date Analyzed 12/31/98 12/31/98 12/31/98 12/31/98 <br /> Instrument 1 D # HP-2 HP-2 HP 2 HP-2 <br /> Conc Spiked 2 0,ug/L 2 0 pg/L 2 0 frg/L 6 0 Ng/L <br /> Matrix Spike <br /> % Recovery 120 110 115 122 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 115 110 115 118 <br /> Relative % <br /> Difference 43 00 0 0 2 8 <br /> i <br /> i <br /> LCS Batch# 2LCS123198 2LCS123198 2LCS123196 2LCS123198 <br /> Date Prepared 12/31/98 12/31/98 12/31/98 12/31/98 <br /> Date Analyzed 12/31/98 12/31/98 12/31/98 12/31/98 <br /> Instrument I D # HP-2 HP-2 HP 2 HP-2 <br /> LCS % <br /> Recovery 950 950 1,000 3,300 <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 /> l 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 /> J interference,the LCS recover is to be used to validate the batch <br /> Janne 1=egley <br /> Project Manager <br /> 8122475 GET <2> <br />