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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue,Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> IT IQP Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(9 16)921 0100 <br /> Kaprealian Engineering, Inc Client Pro!ect ID Unocal #0950 2 <br /> 2401 Stanwell Dr, Ste 400 Matrix Solid 835 Navy Dr, Stockton <br /> Concord, CA 94520 <br /> Attention Avo Avedlsslan QC Sample Group 501-0833 Reported Jan 27, 1995 <br /> QUALfTY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> EPA <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 8015 Mod <br /> Analyst A Tuzon A Tuzon A Tuzon A Tuzon K V S <br /> MS/MSD <br /> Batch# 5010700 5010700 5010700 5010700 5010692 <br /> Date Prepared 1/24/95 1/24/95 1/24/95 1/24/95 1/20/95 <br /> Date Analyzed 1/24/95 1/24/95 1/24/95 1/24/95 1/25/95 <br /> Instrument I D # HP-2 HP 2 HP-2 HP-2 HP-38 <br /> Conc Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg 10 mg/kg <br /> Matrix Spike <br /> % Recovery 95 95 100 102 96 <br /> iMatrix Spike <br /> Duplicate % <br /> Recovery 98 95 103 103 85 <br /> Relative <br /> Difference 3 1 0 0 3 0 098 12 <br /> LCS Batch# 1LCS012495 ILCS012495 lLCS012495 lLCS012495 BLK012095 <br /> Date Prepared 1/24/95 1/24/95 1/24/95 1/24/95 1/20/95 <br /> Date Analyzed 1/24/95 1/24/95 1/24/95 1/24/95 1/25/95 <br /> Instrument I D # HP 2 HP-2 HP 2 HP 2 HP 38 <br /> LCS % <br /> Recovery 91 96 103 102 86 <br /> Recovery <br /> Control Limits 55 145 47-149 47 155 56 140 38 122 <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 /> r, fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> 1 the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> �t interference,the LCS recovery is to be used to validate the batch <br /> Alan B Kemp, <br /> Project Manager <br /> 5010833 KEI <3> <br />