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Sequoia 680 Chcsipeakc Drive Redwood City,CA 94063 (415) 361 9600 IAX(415) 364 9233 <br /> -' 404 N Wigct Lane Walnut Crcck CA 94598 (510) 988 9600 1 AX(5 10)988 9673 <br /> Analytical 8 19 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal #6981, 7855 20 <br /> 3164 Gold Camp Drive, Suite 240 Matrix Liquid <br /> 'Rancho Cordova, CA 95670 Y <br /> ',Attention Steve Carter Work Order # 9702E99 01,02 Reported Mar 6, 1997,' <br /> „r <br /> r'.ti hh J s + 1 4 ++ +. r+ r r4 +1 r + r + u. v r t r w+ r r ♦ r + +} <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Benzene Xylenes <br /> QC Batch# GCO22897BTEX17A GCO22897BTEX17A GCO22897BTEX17A GCO22897BTEX17A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method- 5030 5030 5030 5030 <br /> Analyst A Mirattab A Miraftab A. Miraftab A Miraftab <br /> MS/MSD # 9702C3302 970203302 9702C3302 970203302 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 2/28/97 2/28/97 2/28/97 2/28/97 <br /> Analyzed Date 2/28/97 2/28/97 2/28/97 2/28/97 <br /> Instrument I D # GCHP-17 GCHP-17 GCHP-17 GCHP-17 <br /> Conc Spiked 10 pg/L 10 pg/L 10 pg/L 30 erg/L <br /> Result 88 89 88 26 <br /> 0S % Recovery 88 89 88 87 <br /> Dup Result 97 95 95 29 <br /> MSD % Recov 97 95 95 97 <br /> RPD 97 65 77 11 <br /> RPD Limit 0-25 025 0-25 0-25 <br /> LCS # BLK022897 BLK022897 BLK022897 BLK022897 <br /> Prepared Date 2/28/97 2/28/97 2/28/97 2/28/97 <br /> Analyzed Date 2/28/97 2/28/97 2/28/97 2/28/97 <br /> Instrument I D # GCHP-17 GCHP-17 GCHP-17 GCHP-17 <br /> Conc Spiked 10pg/L 10pg/L 10pg/L 30pg/L <br /> LCS Result. 83 82 82 24 <br /> LCS % Recov .. 83 82 82 80 <br /> MS/MSD <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits 60-140 60-140 60-140 60-140 <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> �QUOIA 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 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 /> 1OGregory <br /> Project Manager '"MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9702E99 GET <1> <br />