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680 Chesapeake Drive Redwood City CA 94053 (650) 364-9600 FAX{650}354-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek.CA 94598 (925}988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9500 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 Diesel Performance <br /> 1260 Graphics Drive <br /> ' Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey QC Sample Group 98091-149-01-06 Reported Oct 8, 1998 <br /> ' QUALITY CONTROL DATA REPORT <br /> Matrix Solid <br /> Method EPA 8015M <br /> Analyst A PORTER <br /> ANALYTE Diesel <br /> QC Batch # GCO930980HBPEXD <br /> Sample No 9809H49-5 <br /> ' Date Prepared 9130198 <br /> Date Analyzed 1015198 <br /> Instrument l D# GCHP4A <br /> Sample Cone mglKg N D <br /> Cone Spiked, mg/Kg 17 <br /> Matrix Spike, mglKg 14 <br /> III Recovery 82 <br /> Matrix <br /> Spike Duplicate, mglKg 13 <br /> % Recovery 76 <br /> Relative % Difference 7 6 <br /> ' RPD Control Limits 0-50 <br /> ' LCS Batch# BLK093098DS <br /> Date Prepared 9130198 <br /> Date Analyzed 1015198 <br /> ' instrument I D # GCHP4A <br /> Conc Spiked, mglKg 17 <br /> Recovery, mglKg 15 <br /> LCS % Recovery 88 <br /> Percent Recovery Control Limits <br /> MSIMSD 50150 <br /> LCS 60-140 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> ' Piease Note <br /> The LCS is a control sample of known interferent tree matrix that is analyzed using the same reagents <br /> EQUOIA 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 /> C 14 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 /> imyai <br /> roject Ma r <br /> 1 <br />