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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)988-9600 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 /> ATC Associates, Inc Client Project ID Diesel Performance 62577 0001 <br /> 1 117 Lane Palm Avenue <br /> ' Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey QC Sample Group 9809H44-01 Reported Nov 12, 1998 <br /> ' QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> ' Analyst AM <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch# GC110198BTEX30A <br /> Sample No GW981OG53-01 <br /> Date Prepared 10/31/98 10/31/98 10/31/98 10/31198 <br /> ' Date Analyzed 10/31/98 10131198 10/31/98 10/31/98 <br /> Instrument i D# GCHP30 GCHP30 GCHP30 GCHP30 <br /> Sample Cone ug/L N D N D N D N D <br /> ' Cone Spiked, ug/L 10 10 10 30 <br /> Matrix Spike, ug/L 11 11 11 33 <br /> % Recovery 110 110 110 110 <br /> Matrix <br /> Spike Duplicate, ug[L 10 10 10 31 <br /> % Recovery 100 100 100 103 <br /> Relative % Difference 9 5 9 5 9 5 6 6 <br /> ' RPD Control Limits 0-25 0-25 0-25 0-25 <br /> ' LCS Batch# GC110198BTEX30A <br /> Date Prepared 11/1/93 1111198 1 111/98 11/1/98 <br /> Date Analyzed 11/1198 1111198 11/1/98 11/1/98 <br /> ' Instrument I D# GCHP30 GCHP30 GCHP30 GCHP30 <br /> Cone Spiked ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 11 11 11 32 <br /> LCS % Recovery 110 110 110 107 <br /> Percent Recovery Control Limits <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 /> an Kim <br /> Project Manager <br />