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' 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> ID Sequoia 404 N Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)98a-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 /> i <br /> ' ATC Associates, Inc Client Project ID {diesel Performance 62577 0001 <br /> 1 117 Lone Palm Avenue <br /> Modesto, CA 95351-1502 <br /> ' Attention Jeanne Hornsey QC Sample Group 98091,144-01 Reported Nov 12, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015A <br /> Analyst A PORTER <br /> ANALYTE Diesel <br /> QC Batch # GC1001980HBPEXB <br /> Sample No 9809D53-3 <br /> Date Prepared 10/1198 <br /> Date Analyzed 1014198 <br /> Instrument 1 D # GCHP4B <br /> Sample Conc ug/L 58 <br /> ' Conc Spiked, ug/l. 1000 <br /> Matrix Spike, uglL 830 <br /> % Recovery 77 <br /> Matrix <br /> Spike Duplicate, ug/L 870 <br /> % Recovery 81 <br /> Relative % Difference 5 1 <br /> ' RPD Control Limits 0-50 <br /> I <br /> ICS Batch# IILK100191IBS <br /> Date Prepared 1011198 <br /> Date Analyzed 1014198 <br /> ' Instrument I D # GCHP4B <br /> Conc Spiked, ug/L 1000 <br /> Recovery, ug1L 720 <br /> LCS % Recovery 72 <br /> Percent Recovery Control Limits <br /> ' F- MS/MSDl-Cs- 50150 <br /> LCS 60 140 <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 an Kim <br /> 7 <br /> Project Manager <br />