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a- ) Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 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)921-9600 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 KOK Realty 62581 0001 <br /> 1260 Graphics Drive <br /> Modesto, CA 953 51-1 502 <br /> Attention Tom Lutterman QC Sample Group 9806EOI-01-03 Reported Jura 30, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015A <br /> Analyst A PORTER <br /> ANALYTE Diesel <br /> QC Batch # GCO625980HBPEXB <br /> Sample No 9806E01-2 <br /> Date Prepared 6/25/98 <br /> Date Analyzed 6126198 <br /> Instrument I D # GCHP58 <br /> Sample Conc , ug/L 87 <br /> Conc Spiked, ug/L 1000 <br /> Matrix Spike uglL 970 <br /> % Recovery 88 <br /> Matrix <br /> Spike Duplicate, ug/L 930 <br /> % Recovery 84 <br /> Relative % Difference 47 <br /> RPD Control Limits 0-50 <br /> LCS Batch# BLK062598BS <br /> Date Prepared 6/25/98 <br /> Date Analyzed 6/26/98 <br /> Instrument I D # GCHP58 <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 /> 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 /> van Ki yai <br /> Project Manager <br />