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A � F <br /> Sequoia 680 Chesapeake Dave Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> (Z) 404 N Wlget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> (rilll Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 `916)921-9600 FAX(916 )921 -Of 00 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 707 792-1865 FAX 707 792-0342 <br /> 0ttler-Ryan - Dublin Client Project ID Unocal 88#5098, Stockton <br /> 47 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9031847-861 Reported Mar 29, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dchloro- Trichioro- Chloro- <br /> ethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst N Nelson N Nelson N Nelson <br /> MS/MSD <br /> Batch# 9032035 5032035 9032035 <br /> Date Prepared 3,2- 99 3 2.1/99 3,24!99 <br /> Date Analyzed 3/2-;/99 3,24/99 3/24199 <br /> instrument I D # HP 6 HF 6 F,P 6 <br /> Conc Spiked 20pg/L 20pg/L 20pg/L <br /> Matrix Spike <br /> % Recovery 110 115 110 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 120 125 115 <br /> Relative % <br /> Difference 87 83 44 <br /> LCS Batch# LCS032499 LCS032499 LCS032499 <br /> Date Prepared 3/24/99 3/24/99 3/24/99 <br /> Date Analyzed 3/24/99 3/24/99 3/24/99 <br /> Instrument I D # HP 6 HP-6 HP 6 <br /> LCS % <br /> Recovery 125 120 130 <br /> Recovery <br /> Control Limits 65-135 70-130 70-130 <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 forth e 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 /> U'L4- Ir- "� the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> 0 interference,the LCS recovery is to be used to validate the batch <br /> lianne Fegley <br /> Project Manager <br /> 9031847 G ET c7> <br />