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' 680 Chesapeake Drive Redwood Clry CA 94063 (650}364-9600 FAX(650) 364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(915)988-9673 <br /> � Analytical 819 Straker 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 /> 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 9808A13-01-03 Reported Sep 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst NC <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> ' QC Batch # GCO82098BTEX30A <br /> Sample No GW9808731-08 <br /> Date Prepared 8120198 8120/98 8120198 8120198 <br /> ' Date Analyzed 8120198 8120/98 8120198 8120198 <br /> Instrument I D# GCHP30 GCHP30 GCHP30 GCHP30 <br /> Sample Cone , ug1L N D N D N D N D <br /> ' Cone Spiked, ug1L 10 10 10 30 <br /> Matrix Spike, ug/L 12 13 11 34 <br /> % Recovery 120 130 110 113 <br /> Matrix <br /> Spike Duplicate, ug1L 12 13 11 34 <br /> % Recovery 120 130 110 113 <br /> Relative % Difference 00 00 00 0 0 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> ' LCS Batch# GWLCS082098A <br /> Date Prepared 8120198 8120198 8120198 8120198 <br /> Date Analyzed 8120198 8/20198 8120198 8120198 <br /> ' Instrument I D# GCHP30 GCHP30 GCHP30 GCHP30 <br /> Cone Spiked, ugIL 10 10 10 30 <br /> ' LCS Recovery, ug1L 12 12 12 35 <br /> LCS % Recovery 120 120 120 117 <br /> Percent Recovery Control Limits <br /> ' <br /> MS/MSD 60140 60140 60140 60140 <br /> LCS 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 recovery is to be used to validate the batch <br /> K n Kim <br /> Project M ger <br />