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364 9600 FAX 415 364 9233 <br /> ■ , Sequoia 680 Chesapeake Drive Redwood eek CA 94063 (415) { ) <br /> 404 N Wkget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)98$ 4673 <br /> Analytical $19 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> qPDS Services Client Project ID Unocal #2859, 1665 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 7020891-899 Reported Mar 4, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Iron Potassium Ammonia Sulfate Phosphorus Nitrate <br /> as NH3 as NO3 <br /> Method EPA 200 7 EPA 200 7 EPA 350 3 EPA 300 0 EPA 365 2 EPA 300 0 <br /> Analyst K Anderson K Anderson Y Bonnshteyn Y Bonnshteyn M Kosovskiy K Aanderson <br /> MS/MSD <br /> Batch# 7020725 7020725 7020897 7020726 7020656 7021496 <br /> Date Prepared 2/21/97 2/21/97 2/21/97 2/19/97 2/28/97 2/28/97 <br /> Date Analyzed 2/26/97 2/26/97 2/21/97 2/19/97 2/28/97 2/28/97 <br /> Instrument I D # MV-4 MV-4 INPH-1 INSPC-1 INSPC-1 INIC-1 <br /> Conc Spiked 1 0 mg/L 21 mg/1- 10 mg/L 100 mg/L 0 50 mg/L 10 mg/L <br /> Matrix Spike <br /> % Recovery 105 162 96 92 100 107 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 115 138 96 92 100 107 <br /> Relative % <br /> Difference 80 56 00 00 00 00 <br /> LCS Batch# LCS022197 LCS022197 LCS022197 LCS021997B LCS022697 LCS022897 <br /> Date Prepared 2/21/97 2/21/97 2/21/97 2/18/97 2/28/97 2/28/97 <br /> Date Analyzed 2/26/97 2/26/97 2/21/97 2/18/97 2/28/97 2/28/97 <br /> Instrument II'D # MV-4 MV-4 INPH-1 INIC-1 INSPC-1 INIC-1 <br /> LCS <br /> Recovery 110 105 100 93 100 100 <br /> Recovery <br /> Control Limits 80 120 80-120 80-120 80 120 80-120 80-120 <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, #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 /> 09nature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matri>< <br /> Alan B Kemp interference the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 7020891 MPC <13;;, <br />