Laserfiche WebLink
' n <br /> SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> Iwo (510) 686-9600 e FAX (510) 686-9689 <br /> MPDS Services, Inc Client project ID Unocal #6981, 4707 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedissian QC Sample Group 4010940-52 Reported Jan 31, 1994 <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 J Fontecha J Fontecha J Fontecha J Fontecha <br /> MS/MSD <br /> Batch# 4010933 4010933 4010933 4010933 <br /> Date Prepared 1/26/94 1/26/94 1/26/94 1/26/94 <br /> Date Analyzed 1/26/94 1/25/94 1/26/94 1/26/94 <br /> Instrument I D # HP 4 HP-4 HP 4 HP 4 <br /> Conc Spiked 20 ug/L 20 pg/L 20 k8/L 60 ug/L <br /> Matrix Spike <br /> % Recovery 95 95 95 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 95 95 95 93 <br /> Relative % <br /> Difference 00 00 00 00 <br /> LCS Batch# 2LCS012694 2LCS012694 2LCS012694 2LCS012694 <br /> Date Prepared 1/26/94 1/26/94 1/26/94 1/26/94 <br /> Date Analyzed 1/26/94 1/26/94 1/26/94 1/26/94 <br /> Instrument 1 D # HP-4 HP-4 HP-4 HP 4 <br /> LCS % <br /> Recovery 90 90 90 91 <br /> ecovery <br /> LControl 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 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 /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> "Ala p <br /> interference the LCS recoveryis to be used to validate the batch <br /> Project Manp er <br /> 4010940 MPD <4> <br />