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680 Qiesapeake Drive Redwood Qty.CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek,CA 94598 (925)988-960o FAX(925)988-%73 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> EA Engineering Science & Tech Client Project ID Exxon 7-0137, 5150137 1300 <br /> 3468 Mt Diablo Blvd Ste 8700 <br /> Lafayette, CA 94549 <br /> Attention Matt Derby QC Sample Group 9901D89-05 Reported Feb 3, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst BTF <br /> ANALYTE Gasoline <br /> QC Batch # GCO20199BTEX30A <br /> Sample No GW9901 E65-01 MS <br /> Date Prepared 211199 <br /> Date Analyzed 211199 <br /> Instrument I D # GCHP30 <br /> Sample Conc , ug/L N D <br /> Conc Spiked, ug/L 250 <br /> Matnx Spike, ug/L 260 <br /> % Recovery 104 <br /> Matrix <br /> Spike Duplicate, ug/L 260 <br /> % Recovery 103 <br /> Relative % Difference 0 97 <br /> RPD Control Limts 0-25 <br /> LCS Batch# GWLCS020199A <br /> Date Prepared 211199 <br /> Date Analyzed 211199 <br /> Instrument I D # GCHP30 <br /> Conc Spiked, ug/L 250 <br /> LCS Recovery ug/L 260 <br /> LCS % Recovery 105 <br /> Percent Recovery Control Limits <br /> MS/MSO 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 aliquat 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 /> Ronald M Chew <br /> Project Manager <br /> 02d <br />