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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> Q 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)911-9600 FAX(9 16)921-0100 <br /> �„� Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Bozzano Property <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> Attention Tom Lutterman QC Sample Group 9806E06-15 Reported Aug 2, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst C Medina <br /> ANALYTE Gasoline <br /> QC Batch # GC062698BTEX17A <br /> Sample No GW9806G27-7 <br /> Date Prepared 6126/98 <br /> Date Analyzed 6126196 <br /> Instrument I D # GCHP17 <br /> Sample Conc , ug/L N D <br /> Conc Spiked ug/L 250 <br /> Matrix Spike, ug/L 220 <br /> % Recovery 89 <br /> • Matrix <br /> Spike Duplicate ug/L 220 <br /> % Recovery 90 <br /> Relative % Difference 1 1 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWBLK062698ABS <br /> Date Prepared 6126/98 <br /> Date Analyzed 6/26/98 <br /> Instrument I D # GCHP17 <br /> Conc Spiked, ug/L 250 <br /> LCS Recovery ug/L 220 <br /> LCS % Recovery 86 <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 /> 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 recovery is to be used to validate the batch <br /> Kay Imyal <br /> Project Manager <br />