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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 4ZN <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Acp Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (9t6) 921 9600 FAX (916)921 0100 <br />*PDS Services Client Project ID Unocal #5098, 5606 pacific Ave, Stockton <br /> 401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider OC Sample Group 6091455-465 Reported Oct 11, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dlchloro- Trlchloro- Chloro- <br /> ethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst P Horton P Horton P Horton <br /> MS/MSD <br /> Batch# 6091460 6091460 6091460 <br /> Date Prepared 1011196 10/1/96 1011196 <br /> Date Analyzed 1011196 1011196 1011196 <br /> Instrument I D # HP-7 HP-7 HP-7 <br /> Conc Spiked 10 erg/L 10 pg/L 10 pg/L <br /> Matrix Spike <br /> % Recovery 106 105 102 <br />. Matrix Spike <br /> Duplicate % <br /> Recovery 104 108 102 <br /> Relative % <br /> Difference 19 2 8 00 <br /> LCS Batch# LCS100196 LCS100196 LCS100196 <br /> Date Prepared 10/1/96 1011196 1011196 <br /> Date Analyzed 10/1196 10/1/96 110/1/96 <br /> Instrument I D # HP-7 HP-7 HP-7 <br /> LCS % <br /> Recovery 99 108 102 <br /> Recovery <br /> Control Limits 60-140 60-140 60-140 <br /> Please Note <br /> The LCS 1s 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 /> Onature 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 recovery is to be used to validate the batch <br /> Project Manager <br /> 6091455 MPO <7> <br />