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' Sequoia 580 Chesapeake Dnve Redwood City,CA 9406_ (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9573 <br />' 1 � Analytical 819 Stnkcr Avenuc Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <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 Karkarian QC Sample Group 5060155-57 v Reported Jun 19, 1995 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyi Xylenes <br />' Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: J Fontecha J Fontecha J Fontecha J Fontecha <br /> MS/MSD <br /> Batch# 5060289 5060289 5060289 5060289 <br /> Date Prepared 6/7/95 6/7/95 6/7/95 6/7/95 <br /> Date Analyzed 6/7/95 6/7/95 6/7/95 6/7/95 <br /> Instrument 1 D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked- 20lig/L 20pg/L 20ug/L 60lig/L <br /> Matrix Spike <br /> % Recover/ 100 105 110 110 <br /> Matrix Spike <br />' Duplicate % <br /> Recovery 100 105 110 113 <br /> Relative % <br /> Difference 00 l , o a Jl ,+ YA to 0 27 <br />' LCS Batch# 2LCS060795 2LCS060795 2LCS060795 2LCS060795 - <br /> Date Prepared 6/7/95 6/7/95 6/7/95 6/7/95 <br /> Date Analyzed 6/7/95 6/7/95 6/7/95 6/7/95 <br /> Instrument 1 D# HP-4 HP-4 HP-4 HP-4 <br />' LCS % <br /> Recovery 103 109 113 113 <br />' % RecovM <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> Please Note <br /> The LCS is a control sample of known,interte rent free matrix that is analyzed using the same reagents, <br /> EQUOIA 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 /> PISignature on File 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 /> Alan B Kemp ' <br /> Project Manager <br /> -_ _ 5060155 MPD <B> <br />