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.3 <br /> lµ Sequoia680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 H Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> WPM Services Client Project 1D Unocal #0123, 1034 Central Ave , Tracy <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6121094-096 Reported Dec 27, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Trichloro- Chloro- <br /> ethene ethane benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst P Horton P Horton P Horton <br /> MS/MSD <br /> Batch# 6121016 6121016 6121016 <br /> Date Prepared 12/18/96 12/18/96 12/18/96 <br /> Date Analyzed 12/18/96 12/18/96 12/18/96 <br /> Instrument I D # HP-7 HP-7 HP-7 <br /> Conc Spiked 10 pg1L 10 l.ig/L 10 pg/L <br /> Matrix Spike <br /> % Recovery 109 110 97 <br /> iMatrix Spike <br /> Duplicate % <br /> Recovery 108 106 96 <br /> Relative % <br /> Difference 090 37 10 <br /> LCS Batch# LCS121996 LCS121996 LCS121996 <br /> Date Prepared 12/19/96 12/18/96 12/18/96 <br /> Date Analyzed 12/19/96 12/18/96 12/18/96 <br /> Instrument I D # HP-7 HP-7 HP-7 <br /> LCS % <br /> Recovery 113 111 99 <br /> Recovery <br /> Control Limits 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 /> 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 /> �101gnature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LGS recovery is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 6121094 MPD <8> <br />