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la� <br /> 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9,600 FAX(650) 364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(9Z5)988 9673 <br /> Analytical 819 Stryker Avenue Suite a Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 j <br /> 1455 McDowell Blvd North Ste D Petaluma_CA 94954 (707) 792 1865 FAX(707)792 0342 1 <br /> r <br /> r <br /> r <br /> EA ENGINEERING Client Project ID EXXON 7-3942 5153942 1300 <br /> 3468 Mt Diablo Blvd Ste B100 <br /> Lafayette, CA 94549 <br /> Attention Chnsta Marting OC Sample Group 9808C98 Reported Sep 24, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst NC <br /> ANALYTE Gasoline <br /> QC Batch # GCO82498BTEX30A <br /> Sample No GW9808314-02 # <br /> Date Prepared 8/24/98 <br /> Date Analyzed 8/24198 I <br /> Instrument I D # GCHP30 <br /> Sample Cone ug/L N D <br /> Cone Spiked ug/L 250 j <br /> Matrix Spike ug/L 220 <br /> % Recovery 88 <br /> F <br /> f <br /> Matrix <br /> 1110e Duplicate ug/L 230 � <br /> % Recovery 92 } <br />' Relative % Difference 4 4 <br /> RPD Control Limits 0-25 <br /> t <br /> s <br /> LCS Batch# GWLCS082498A <br />' Date Prepared 8/24198 <br /> Date Analyzed 8/24/98 t <br /> Instrument I D # GCHP30 !t} <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 /> uahty 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 /> QUOIA NALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified wah known quantities of specific compounds and subjected to the enure analytical procedure If <br /> t <br /> the recovery of analytes from the matrix spike does not fail within specified control limas due to Matrix E <br /> ei Met Shinnterference the LCS recovery is to be used to validate the batch <br /> loject Manager <br /> I � <br />