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Se l101d 680 Chesapeake Drive Redwood C=ry CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> J!1 q 404 N Wigec Lane Walnut Creek Ca,94598 (925)988 %00 FAX(925)988-9673 <br /> 1440 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 1 <br /> 1455 McDowell Blvd North See D Petaluma,CA 94954 (707) 792 1865 FAX(707)792 0342 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 ChrlSta Marting QC Sample Group 9808C95 <br /> Reported Sep 24, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst MMCMILLAN <br /> ANALYTE Gasoline f <br /> QC Batch # GCO82698BTEX03A <br /> Sample No GW9808A87-04 <br /> Date Prepared 8126/98 <br /> Date Analyzed 8/26/98 <br /> Instrument I D # GCHP03 <br /> Sample Cone ug/L N D r <br /> Cone Spiked, ugIL 250 <br /> Matrix Spike, ug/L 280 <br /> % Recovery 110 <br /> Matrix <br /> ike Duplicate, ug/L 270 <br /> % Recovery 108 <br /> Relative % Difference 18 <br /> RPD Control Limits 0-25 <br /> it <br /> k <br /> LCS Batch# GWLCS082698A f <br /> l <br /> Date Prepared 8126/98 <br /> Date Analyzed 8126198 <br /> Instrument 1 D # GCHP03 <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 /> uallty 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 /> FQUOIA ANALYTICAL preparation and analytical methods employed for the sampres The matnx spike s an aliquot o1 sample <br /> fortified with known quantities of specdic compounds and subjected to the entire analytical procedure if <br /> E. <br /> recovery of analytes from the matrix spike does not fall within spec fied control limits due to matrix <br /> interference the LCS recover is to be used to validate ilio batch <br /> et Mei Shin <br /> troject Manager <br />