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ar r u <br /> 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 /> Analytical 8E9""' 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 Stockton Fire#2 62574 0001102 <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey QC Sample Group 9809G80-01-03 Reported Oct 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015A <br /> Analyst A PORTER <br /> ANALYTE Diesel <br /> QC Batch # GCO930980HBPEXE <br /> Sample No 9809GBO-1 <br /> Date Prepared 9130198 <br /> Date Analyzed 10/2198 <br /> Instrument I D # GCHP413 <br /> Sample Conc , ug/L 460 <br /> Conc Spiked, ug/L 1000 <br /> Matrix Spike, ug/L 390 <br /> Recovery -711 <br /> Matrix <br /> Spike Duplicate, ug/L 1400 <br /> % Recovery 94 <br /> Relative % Difference 232 <br /> RPD Control Limits 0-50 <br /> LCS Batch# BLK09309BES <br /> Date Prepared 9130198 <br /> Date Analyzed 1012198 <br /> Instrument I D# GCHP413 <br /> Conc Spiked, ug/L 1000 <br /> Recovery, ug/L 860 <br /> LCS % Recovery 86 <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 /> 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 /> 0 ` 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 /> n Kimyat <br /> Kinterference the LCS recover is to be used to validate the batch <br /> Ka <br /> Pro ect Ma er <br />