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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br />' E A Engineering Science &Tech Client Project ID Exxon 7-3942/83739 42 <br /> 3841 N Freeway Blvd , Ste 145 Matrix Liquid <br />' "Sacramento, CA 95834 <br /> Attention Kyriacous Kyrlacou Work Order # 9508J17-03-07 Reported Sep 5, 1995 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> OC Batch#. G0082895BTEX22A GCO82895BTEX22-A GCO82895BTEX22-A GCO82895BTEX22A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br />' Analyst' R Geckle( R.Geckler R Geckler R Geckler <br /> MS/MSD #: 950SE0403 9508EO403 9508EG403 9508E0403 <br />' Sample Conc. N D N D N D N D <br /> Prepared Date 8/28/95 8/28/95 8/28/95 8/28/95 <br /> Analyzed Date* 8/28/95 8/28/95 8/28/95 8/28/95 <br /> Instrument I D.#. GCHP22 GCHP22 GCHP22 GCHP22 <br />' Conc. Spiked lope/L lopg/L iopg/L 30pg/L <br /> Result. 90 90 93 28 <br />�MS % Recovery 90 90 93 93 <br /> Dup. Result: 10 11 12 35 <br /> MSD % Recov. 100 110 120 117 <br />' RPD: 11 20 25 22 <br /> RPD Limit, 0.50 0-50 0.50 0-50 <br /> LCS #' - - - <br />' Prepared Date <br /> Analyzed Date, - - <br />' Instrument I D.#: - <br /> Conic Spiked <br /> LCS Result: - - <br />' LCS %Recov : - - - - <br /> MS/MSD <br /> j_C$ 71-133 72-128 72-130 71-120 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known interferent tree matrix that is analyzed using the same reagents <br /> SE; <br /> E O A ALYTICAL 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 recovery Is to be used to validate the batch <br /> egf�Y P er <br />' Project Manager `*MS=Matrix Spike MSD=MS Duplicate RPD=Relative%Difference 9508J17 EEE <2> <br />