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680 Chesapeake Drive Redwood CEry 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)92t-0100 <br /> e1wo Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos, CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> ATC Associates, Inc Client Project lD KOK Realty 62581 0001 <br /> 1117 Lone Palm Avenue <br /> Modesto, CA 95351-1502 <br /> Attention Tom Lutterman OC Sample Group 9903721-03 Reported Mar 26, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst MM <br /> ANALYTE Gasoline <br /> QC Batch # GCO32499BTEX02A <br /> Sample No 9903712-01 <br /> Date Prepared 3124199 <br /> Date Analyzed 3124199 <br /> Instrument I D # GCHP02 <br /> Sample Cone , ug/L N D <br /> Cone Spiked, ug/L 250 <br /> Matrix Spike ug/L 250 <br /> % Recovery 101 <br /> Matrix <br /> Spike Duplicate, ug/L 250 <br /> % Recovery 99 <br /> Relative % Difference 2 0 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC032499BTEX02A <br /> Date Prepared 3124199 <br /> Date Analyzed 3124199 <br /> Instrument I D # GCHP02 <br /> Cone Spiked ug/L 250 <br /> LCS Recovery ug/L 220 <br /> LCS % Recovery 89 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 <br /> LCS 70 130 <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 /> EQUOIA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantiles of specific compounds and subjected to the entire analytical procedure If <br /> r ` <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 /> K yuan Ki <br /> Protect Manager <br />