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Sequoia 680 Chesapeake Drive Redwood Cty CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> 404 N Wipt Lane Walnut Creek CA 94598 (510) 988-9600 FAX(510)988 9673 <br /> %0 Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies CllentProject ID Former Unocal 2859, 280054 85 <br /> 6747 Sierra Court, Ste J Mature Liquid <br /> 'Dublin, CA 94568 <br /> Attention Deanna Harding Work Order # 9803390-02-06 Reported Mar 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS031098MTBEF3A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst E Manuel <br /> MS/MSD # 980339107 <br /> Sample Conc N D <br /> Prepared Date 3/10/98 <br /> Analyzed Date 3/10/98 <br /> instrument I D # F3 <br /> Cone Spiked 50 Mg/L <br /> Result- 42 <br /> .MS % Recovery 84 <br /> Dup Result 43 <br /> MSD % Recov 86 <br /> RPD 24 <br /> RPD Limit 0-25 <br /> LCS # LCS031098 <br /> Prepared Date 3/10/98 <br /> Analyzed Date 3/10/98 <br /> Instrument I D# F3 <br /> Cone Spiked 50ug/L <br /> LCS Result 43 <br /> LCS % Recov . 86 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> A!@>rQUOI LYTICAL 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 ff <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 /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9803390 GET <3> <br />