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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> 404 N Wiger lane Walnut Creek CA 94598 (9Z5)988 9600 FAX(925)988 9673 <br /> 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 OIpO <br /> �o Analytical <br /> 1455 McDowell Blvd North Ste D Pet CA 94954 1707) 79Z 1865 FAX(707) 792 0342 <br /> 0 <br /> Delta Environmental Client Project ID Exxon 7-3708 D093-809 <br /> 3 164 Guld Canip uI IVC #200 <br /> Rancho Cordova, CA 95670 <br /> Attention Jir-n Brownell QC Sample Group 9807152-02,04-08 Reported Jul 14 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst C Medina <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC070898BTEX17A <br /> Sample No GW9806173 5 <br /> Date Prepared 7/8198 718198 7/8/98 718198 <br /> Date Analyzed 7118198 718198 7/8/98 7/8198 <br /> Instrument l D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Sample Conc ug/L N D N D N D N D <br /> Conc Spiked ug/L 10 10 10 30 <br /> Matrix Spike ug/L 9 3 9 7 9 1 27 <br /> c/o Recovery 93 97 91 90 <br /> Matrix <br /> Spike Duplicate ug/L 9 1 9 3 9 3 25 <br /> % Recovery 91 93 93 83 <br /> Relative % Difference 2 2 4 2 2 2 8 1 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWBLK070898ABS <br /> Date Prepared 718198 718198 7/8198 718198 <br /> Date Analyzed 718/98 7/8198 718198 718198 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked ug/L 10 10 10 30 <br /> LCS Recovery ug/L 9 6 10 8 7 29 <br /> LCS % Recovery 96 100 87 97 <br /> Percent Recovery Control Limits <br /> MS/MSo 60 140 60140 60140 60 140 <br /> LC5 70 130 70 130 70130 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 samphe 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 /> �1 interference the LCS recovery is to be used to validate the batch <br /> Richard Hrling <br /> Project Manager <br /> R.�7 <br />