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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (650) 364 9600 FAX (650)364 9233 <br /> 14% � 1 404 N Wiget 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 (1)16) 921 0100 <br /> Pacific Environmental Group Client Project ID 311-174 1A/BP 5447, Stockton <br /> 2025 Gateway Place, Suite 440 Matrix Solid <br /> San Jose, CA 95110 <br /> Attention Jessica Nelligan Work Order # 9802212 01-07 Reported Fete 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS020698MTBEEXA <br /> Analy Method EPA 8260 <br /> Prep Method NA <br /> Analyst M Williams <br /> MS/MSD # 980220902 <br /> Sample Cone 300 <br /> Prepared Date 2/6/98 <br /> Analyzed Date 2/6/98 <br /> Instrument I D # H6 <br /> Cone Spiked 2500 ug/Kg <br /> Result 2600 <br /> MS %Recovery 92 <br /> Dup Result 2700 <br /> MSD % Recov 96 <br /> RPD 38 <br /> RPD Limit 0-25 <br /> LCS# LCS020698 <br />' Prepared Date 2/6/98 <br /> Analyzed Date 2/6/98 <br /> Instrument I D # H6 <br /> Cone Spiked 2500 ug/Kg <br /> LCS Result 2300 <br /> LCS % Recov 92 <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 /> SEQUOIA 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 /> Z i the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Tod Granicher interference,the LCS recovery is to be used to validate the batch <br /> I Project Manager "*NIS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference <br /> 9802212 PPP <1> <br />