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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 (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 /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Oler-Ryan -Dublin Client Project ID 3202 W Hammer Ln , Stockton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Doug Lee GSC Sample Group 812-0639 Reported Dec 16, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloroethene Trichloroethene Benzene Toluene Chloro- Mercury <br /> benzene <br /> Method EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 7470 <br /> Analyst N Nelson N Nelson N Nelson N Nelson N Nelson T Le <br /> MS/MSD <br /> Batch# 8120345 8120345 8120345 8120345 8120345 8120431 <br /> Date Prepared 12/10/98 12/10/98 12/10/98 12/10/98 12/10/98 12/9/98 <br /> Date Analyzed 12/10/98 12/10/98 12/10/98 12/10/96 12/10/98 12/11/98 <br /> Instrument I D # GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 MV-1 <br /> Cork Spiked 50 ug/L 50 Ng/L 50 ug/L 50 yg/L 50Ng/L 0 0020 mg/L <br /> Matrix Spike <br /> % Recovery 102 106 110 106 108 105 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 90 98 98 100 100 100 <br /> Relative % <br /> Difference 13 78 12 58 77 49 <br /> LCS Batch# LCS121098 LCS121098 LCS121098 LCS121098 LCS121098 LCS120998 <br /> Date Prepared 12/10/98 12/10/98 12/10/98 12/10/98 12/10/98 12/9/98 <br /> Date Analyzed 12/10/98 12/10/98 12/10/98 12/10/98 12/10/98 12/11/98 <br /> Instrument I D # GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 MV 1 <br /> LCS % <br /> Recovery 102 106 108 108 108 95 <br /> Recovery <br /> Control Limits 65-135 70-130 70-130 70-130 70-130 75-125 <br /> Please Nate <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 /> r interference,the LCS recove is to be used to validate the batch <br /> ulianne Fegley <br /> Project Manager <br /> 8120639 GET <6> <br />