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680 ChWiesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N get Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-Of 00 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Continental Grain 62500 0001 <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> Attention Drew Van Allen QC Sample Group 9808H14-01-04 Reported Oct 16, 1998 <br /> ' QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> 1 Method EPA 801018020, 6011602 <br /> Analyst 8 ALI <br /> ANALYTE 1,1-DCE TCE Chlorobenzene Benzene Toluene Chlorobenzene <br /> QC Batch # GCO828980VOA24A <br /> Sample No 9808935-01 <br /> ' Date Prepared 8127198 8127198 8127198 8127198 8127198 8127/98 <br /> Date Analyzed 8127198 8127198 8127198 8127198 8127198 8/27/98 <br /> Instrument I D # GCHP24 2 GCHP24 2 GCHP24 2 GCHP24 2 GCHP24 2 GCHP24 2 <br /> ' Sample Conc , uglL N D N D N D N D N D N D <br /> Conc Spiked uglL 125 125 125 125 125 125 <br /> Matrix Spike, uglL 110 140 160 140 140 130 <br /> % Recovery 88 112 128 112 112 104 <br /> Matrix <br /> Spike Duplicate, uglL 100 130 140 140 130 120 <br /> ' % Recovery 80 104 112 112 104 96 <br /> Relative % Difference 9 5 74 13 00 74 80 <br /> rRPD Control Limits 0-50 0-50 0-50 0-50 0-50 0-50 <br /> 1 LCS Batch# VWLCS082898A <br /> Date Prepared 8128198 8128198 8128198 8128198 8128198 8128198 <br /> ' Date Analyzed 8128198 8128198 8128198 8128198 8128198 8128198 <br /> Instrument I D# GCHP24 2 GCHP24 2 GCHP24 2 GCHP24 2 GCHP24 2 GCHP24 2 <br /> Conc Spiked ug1L 25 25 25 25 25 25 <br /> Recovery, uglL 23 27 30 29 27 26 <br /> LCS % Recovery 92 108 120 116 108 104 <br /> ' Percent Recovery Control Limits <br /> MSIMSD 60-140 60140 60140 60140 60140 60140 <br /> LCS 65-135 70130 70130 70130 70130 70130 <br /> ' Quality Assurance Statement All standard operating procedures and quality control requirements have been met <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 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 recover is to be used to validate the batch <br /> K n Kimy <br /> rolect Manager <br />