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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N W�get lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> l 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> �,* Analytica <br /> 0 PDS Services <br /> Client Protect ID Unocal #6981, 4707 Pacific Aye , Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider OC Sample Group 6071873-875 Reported Aug 7, 1996 <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 S Chullakorn S Chullakorn S Chullakorn S Chullakorn <br /> MS/MSD <br /> Batch# 6071539 6071539 6071539 6071539 <br /> Date Prepared 7/29/96 7/29/96 7/29/96 7/29/96 C� <br /> Date Analyzed 7/29/96 7/29/96 7/29/96 7/29/96 <br /> Instrument I D # HP-11 HP-11 HP-11 HP-11 <br /> Conc Spiked 20pg/L 20Ng/L 20/tg/L 60ftg/L <br /> Matrix Spike <br /> % Recovery 115 97 105 101 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 82 95 89 <br /> Relative % <br /> Difference 14 17 10 12 <br /> LCS Batch# 11 LCS072996 11 LCS072996 11 LCS072996 11 LCS072996 <br /> Date Prepared 7/29/96 7/29/96 7/29/96 7/29/96 <br /> Date Analyzed 7/29/96 7/29/96 7/29/96 7/29/96 <br /> Instrument I D # HP-11 HP-11 HP-11 HP-11 <br /> LCS % <br /> Recovery 115 95 105 102 <br /> % ecovery <br /> Control Limits 60-140 60-140 60-140 60-140 <br /> Please Mote <br /> The LCS 1s a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> 0 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 /> Signature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan B Kemp interference,the LCS recovery is to be used to validate the Batch <br /> Project Manager <br /> 6071873 MPD <5> <br />