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11 (� <br /> Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> 1900 Sates Avenue,Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 92i 9600 FAX(916)921 0100 <br /> MPRS Services AClient Proje6i lb Unocal #'2859, 1665 pacific Ave , Stockton <br /> s<2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedesslan QC Sample Group 4080913-919 Reported Aug 30, 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 A.Tuzon A Tuzon A.Tuzon A.Tuzon <br /> MS/MSD <br /> Batch# 4081061 4081061 4081061 4081061 <br /> Date Prepared 8/24/94 8/24/94 8/24/94 8/24/94 <br /> Date Analyzed 8/24/94 8/24/94 8/24/94 8/24/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Cone Spiked 20ug/L 20yg/L 20,ug/L 60pg/L <br /> Matrix Spike <br /> . %%Recovery 85 95 95 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 80 90 90 95 <br /> Relative% <br /> Difference 61 54 54 21 <br /> LCS Batch# 2LCS082494 21-CS082494 2LCS082494 2LCS082494 <br /> Date Prepared 8/24/94 8/24/94 8/24/94 8/24/94 <br /> Date Analyzed 8/24/94 8/24/94 8/24/94 8/24/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 91 100 102 104 <br /> Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> Please Mote <br /> The LCS 1s a control sample of known,interferentfree matrix that 1s analyzed using the same reagents, <br /> �EQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike 1s 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 /> interference,the LCS recovery is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 4080913 MPD <5> <br />