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Sequoia 680 Chesapeake Dnve Redwood City, CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> s 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical <br /> §' 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Iwo <br /> IWPDS Services Client Project ID Unocal #0123, 1034 Central Ave , Tracy <br /> 2401 Stanwell Dr, Ste 300 Matrix Solid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group Reported Mar 19, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Trichloro- Chloro- 1,1-Dichloro- Trichloro- Chloro <br /> ethene ethene benzene ethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst P Horton P Horton P Horton P Horton P Horton P Horton <br /> MS/MSD <br /> Batch# 7030302 7030302 7030302 7030302 7030302 7030302 <br /> Date Prepared 3110197 3110197 3110197 3110197 3110197 3110197 <br /> Date Analyzed 3110197 3110197 3/10197 3/10197 3110197 3110197 <br /> Instrument I D # HP-7 HP-7 HP-7 HP-7 HP-7 HP-7 <br /> Cork Spiked 10 pglL 10 pg/l- 10 pglL 10 NgIL 10 VglL 10 pglL <br /> Matrix Spike <br /> % Recovery 107 102 101 107 102 101 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 107 99 98 107 99 98 <br /> Relative % <br /> Difference 00 30 30 00 30 30 <br /> LCS Batch# LCS031197 LCS031197 LCS031197 LCS031097 LCS031097 LCS031097 <br /> Date Prepared 3/11197 3/11197 3111197 3110197 3110197 3110197 <br /> Date Analyzed 3111/97 3111197 3111197 3110197 3/10197 3110197 <br /> Instrument I D # HP-7 HP-7 HP-7 HP-7 HP-7 HP-7 <br /> LCS % <br /> Recovery 112 103 99 113 101 96 <br /> Recovery <br /> Control Limits 60-140 60 140 60-140 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 /> gnature 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 /> 7030493!VIP D <10> <br />