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Sequoia 680 Chc5apeake Drtvc Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wtget Lane Walnut Crcek CA 94598 (510) 988 9600 FAX(510)988-9673 <br /> Analytical <br /> *Tocol 819 Sinker Avenuc Suar it Sacramcnw, CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> 1W 0 <br /> Gettfer Ryan/Geostrategies Client Project ID Unocal 4855 18 <br /> 3164 Gold Camp Drive #240 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> Attention Steve Carter Work Order# 9801 E46 -01,02 Reported Feb 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#. GCO12898BTEX21A GC012898STEX21A G00128-08BTEX21A GCO1289813TEX21A GC0128988TEX21A <br /> Analy. Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep. Method. EPA 5034 EPA 5030 EPA 5030 EPA W30 EPA 5030 <br /> Analyst A Mirattab A Miraftab A Mfraftab A Mlrattab A.Mtraftab <br /> MS/MSD# 980196701 980196701 980196701 980196701 980196701 <br /> Sample Cone.: N D N D N D N D N D <br /> Prepared Date 1/28/98 1/28/98 1/28/98 1/28/98 1/28/98 <br /> Analyzed Date 1/28/98 1/28/98 1/26/98 1/28/98 1/28/98 <br /> Instrument I D#. GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked. 10pg/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> Result 93 91 90 26 49 <br /> 40S % Recovery. 93 91 90 87 82 <br /> Dup. Result: 95 94 94 28 52 <br /> MSD%Recov ,, 95 94 94 93 87 <br /> RPD: 21 32 43 74 59 <br /> RAD Limit 0-25 0-25 0-25 0-25 0 25 <br /> LCS#. 13t.K012898 BLK012898 BLK012898 BLK012898 BLK012898 <br /> Prepared Date 1/28/98 1/28/98 1/28/98 1/28/98 1/28/98 <br /> Analyzed Date 1/28/98 1/28/98 1/28/98 1/28/98 1/28/98 <br /> Instrument I D.# GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Cone Spiked 10Ng/L 10yg/L 10pg/L 30pg/L 60pg/L <br /> LCS Result- 94 92 92 27 52 <br /> LCS % Recov 94 92 92 90 87 <br /> 60140 60-140 60-140 60-140 60140 <br /> LCS 70-130 70-130 70-130 70-130 701-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that 1s analyzed using the sante reagents, <br /> dbQUOIA AAALYTICAL 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 /> /r 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 /> < <br /> re <br /> gory <br /> Project Manager MS—Matrix Spike,MSD=MS Duplicate,RPD=Fielattve%Difference 9801E46 GET <1 y <br />