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680 Chesapeake Drive Redwood City U 44063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wlget Lanz Wainut Creek U 94598 (925)988-9600 FAX(925)988-%73 <br /> Analytical 819 StrllcerAverwe,Suite$ Sacramento U 95$34 (916)921-9600 FAx(916)921-0100 <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 8100 <br /> Lafayette, CA 94549 <br /> Attention Matt Derby QC Sample Group 9901 D89-06-07 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# GCO129998TEX06A <br /> Sample No GW9901 D48-3MS <br /> Date Prepared 1129199 <br /> Date Analyzed 1129199 <br /> Instrument I D # GCHP06 <br /> Sample Conc , u91L N D <br /> Cone Spiked, ug1L 250 <br /> Matnx Spike ug1L 250 <br /> % Recovery 101 <br /> Matrix <br /> Spike Duplicate, uglL 220 <br /> % Recovery 88 <br /> Relative % Difference 14 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWLCS012999A <br /> Date Prepared 1129199 <br /> Date Analyzed 1129199 <br /> Instrument I D# GCHP06 <br /> Cone Spiked, ug/L 250 <br /> LCS Recovery, ug1L 260 { <br /> LCS % Recovery 104 <br /> Percent Recovery Control Limits <br /> MSlIVISD 66140 <br /> F- 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 recover is to be used to validate the batch <br /> Ro a d M Chew <br /> Project Manager <br /> DQ <br /> `6d' <br />