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Sequoia 680 Chesapeake Drive Redwood City CA 9406 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N Wiget Lane Walnut Creels,C4 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> v t v n r vnvv . vv n v r _ v v vn <br />' MPDS Services' Client Project ID Unocal #0123, 1034 Central Ave,Tracy <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkanan QC Sample Group 5060155-57 Reported Jun 19, 1995 <br /> 1 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Trichloro- Chloro- <br />' ethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Nill K bill K Nill <br /> MS/MSD <br /> Batch# 5050157 5060157 5060157 <br />' Date Prepared 615195 616195 616195 <br /> Date Analyzed. 616195 616195 616195 <br /> Instrument I D # HP5890-06 HP5890-06 HP5890-06 <br />' Cone Spiked 100 mg1L 100 mglL 100 mg1L <br /> Matrix Spike <br /> % Recovery 84 97 100 <br /> Matrix Spike <br /> Duplicate% <br />' Recovery. 80 91 97 <br /> Relative% <br /> .. .k...Difference v l 49 >, v 67 `3 0 <br /> LCS Batch#. LCS060695 LCS060695 LCS060695 <br /> Date Prepared 616195 616195 616195 <br /> Date Analyzed 616195 616195 616195 <br /> Instrument I D # HP589D-06 HP5890-06 HP5890-06 <br /> LCS % <br /> Recovery: 74 83 93 <br /> % Recovery <br /> Control Limits. 28-167 35-146 38-150 <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, #1271 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 /> Signature on File the recovery of analytes from the matnx spike does not fall;within specified control limits due to matrix <br /> interference,the LCS recove is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager _ - <br />' _ _ 5060155MPD <10> <br />