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680 Chesapeake Drive Redwood City.CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wlget Lane Walnut Creek CA 94599 (925)988-9600 FAX(925)988-9673 <br /> �,,� Analytical 919 Striker Avenue,Suite 9 Sacramento U 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.U 94954 (707)792-1965 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 9901D89-08-09 Reported Feb 3, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst MM <br /> ANALYTE Gasoline <br /> QC Batch # GCO12999STEX30A <br /> Sample No GW9901 C55-21 <br /> Date Prepared 1/29/99 <br /> Date Analyzed 1129199 <br /> Instrument I D # GCHP30 <br /> Sample Conc , ug/L N D <br /> Conc Spiked, ug/L 250 <br /> Matrix Spike, ug/L 320 <br /> % Recovery 128 <br /> Matrix <br /> Spike Duplicate, uglL 310 <br /> % Recovery 124 <br /> Relative % Difference 3 2 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC012999BTEX30A <br /> Date Prepared 1129/99 <br /> Date Analyzed 1129199 <br /> Instrument I D # GCHP30 <br /> Conc Spiked, ug/L 250 <br /> LCS Recovery, ug/L 260 { <br /> LCS % Recovery 104 <br /> Percent Recovery Control 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 /> 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 recove is to be used to validate the batch <br /> Ronal M Chew <br /> Project Manager <br /> 'fad+ <br />