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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 /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)9Z1 0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792 1865 FAX(707)792 0342 <br /> Gettler Ryan/Geostrategles Client Project ID 6981, 140124 02/4707 Pacific <br /> 6747 Sierra Court, Suite J <br /> Dublin, CA 94568 <br /> Attention Steve C QC Sample Group 981OG49 Reported Oct 29, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst MM <br /> ANALYTE Gasoline <br /> QC Batch # GC102398BTEX30A <br /> I <br /> Sample No GW981GA62-04 <br /> Date Prepared 10/23/98 <br /> Date Analyzed 10/23/98 <br /> Instrument ) D # GCHP30 <br /> Sample Conc , ug/L N D <br /> Conc Spiked, ug/L 250 <br /> Matrix Spike, ug/L 270 <br /> % Recovery 108 <br /> Matrix <br /> Spike Duplicate, ug/L 280 <br /> % Recovery 112 <br /> Relative % Difference 3 6 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC102398BTEX30A <br /> Cate arerared '0 23/98 <br /> Date Analyzed 10/23/98 <br /> Instrument I D # GCHP30 <br /> Conc Spiked ug/L 250 <br /> LCS Recovery, ug/L 280 <br /> LCS % Recovery 112 <br /> Percent Recovery Contra) Limits <br /> MSIMSD 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 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 recovery is to be used to validate the batch <br /> Tod Granicher <br /> Project Manager <br />