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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek,CA 94598 (925)988-96W FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> tGround Zero Analysis, Inc Client Project ID 96-163/Knowles Roek <br /> 1714 Main St <br /> Escalon, CA 95320 <br /> Attention Greg Stahl QC Sample Group 9810110-01-02 Reported Nov 5, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> ' Analyst GRIMM <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> ' QC Batch# GC102798BTEX02A <br /> Sample No GW981OC90-1 <br /> Date Prepared 10/27/96 10/27/98 10/27/98 10/27/98 <br /> Date Analyzed 10/27/98 10/27/98 10/27/98 10127/98 <br /> Instrument I D# GCHP02 GCHP02 GCHP02 GCHP02 <br /> Sample Conc , ug/L N D N D N D N D <br /> ' Conc Spiked ug/L 10 10 10 30 <br /> Matrix Spike, ugIL 8 6 8 9 9 4 27 <br /> % Recovery 86 89 94 92 <br /> Matrix <br /> Spike Duplicate, ug1L 9 2 9 4 9 8 29 <br /> % Recovery 92 94 98 97 <br /> ' Relative % Difference 6 7 5 5 4 2 5 3 <br /> ' RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS10279811 <br /> Date Prepared 10/27/98 10/27/98 10/27/98 10127/98 <br /> Date Analyzed 10/27/98 10/27/98 10/27/98 10127/98 <br /> ' Instrument I D # GCHP02 GCHP02 GCHP02 GGHF02 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 9 4 9 6 10 30 <br /> LCS % Recovery 94 96 101 100 <br /> Percent Recovery Control Limits <br /> ' MSIMSD 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 /> Kay n imyai <br /> Project Manage <br />