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Sequoia coxa 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> St <br /> 404 N Wiget lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707) 792 1865 FAX(707)792 0342 <br /> I <br /> EA ENGINEERING Client Project ID EXXON 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd Ste B100 <br /> Lafayette, CA 94549 <br /> Attention Christa Martmg QC Sample Group 9808C97 Reported Sep 24, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst DB <br /> ANALYTE Gasoline <br /> QC Batch # GCO82598BTEX30A <br /> Sample No GW9808821 03 <br /> Date Prepared 8/25198 <br /> Date Analyzed 8125/98 <br /> Instrument I D# GCHP30 <br /> Sample Cone , ug/L N D <br /> Cone Spiked, ug/L 250 <br /> Matrix Spike, ug/L 200 <br /> % Recovery 80 <br /> Matrix <br /> Ake Duplicate, ug1L 240 <br /> % Recovery 96 <br /> Relative % Difference 18 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWLCS082598A <br /> Date Prepared 8/25198 <br /> Date Analyzed 8125198 <br /> Instrument I D# GCHP30 <br /> Cone Spiked ug/L 250 <br /> LCS Recovery, ug/L 250 <br /> LCS % Recovery 100 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 <br /> LCS 70 130 <br /> uality 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 /> el Mei hin <br />[reject Manager <br />