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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> W&F Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> *PD8 Services Client Project ID Unocal #5098, 5606 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6030760-764 Reported Mar 27, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst S Chullakorn S Chullakorn S Chullakorn S Chullakorn <br /> MS/MSD <br /> Batch# 6030759 6030759 6030759 6030759 <br /> Date Prepared 3/25/96 3/25/96 3/25/96 3/25/96 <br /> Date Analyzed 3/25/96 3/25/96 3/25/96 3/25/96 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20,ug/L 20pg/L 20jug/L 60Mg/L <br /> Matrix Spike <br /> % Recovery 120 110 115 112 <br /> . Matrix Spike <br /> Duplicate % <br /> Recovery 110 100 105 105 <br /> Relative % <br /> Difference 87 95 91 6 2 <br /> LCS Batch# 1 LCS032596 1 LCS032596 1 LCS032596 1 LCS032596 <br /> Date Prepared 3/25/96 3/25/96 3/25/96 3/25/96 <br /> Date Analyzed 3/25/96 3/25/96 3/25/96 3/25/96 <br /> Instrument I D ## HP-2 HP-2 HP-2 HP-2 <br /> LCS <br /> Recovery 120 115 115 113 <br /> Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 <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 /> egnature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan B Kemp interference,the LCS recove is to be used to validate the batch <br /> Project Manager <br /> 6030760 MPD <3> <br />