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411 <br /> 4D <br /> Sequoia <br /> 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> '%W Analytical 1900 Bates Avenue,Suite L Concord CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> *PDS Services Client Project lb Unocal #5421, 7303 Pacific Ave, Stockton <br /> 401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian OC Sample Group 4060357-60 Reported Jun 21, 1994 <br /> QUALITY 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 J Fontecha J Fontecha J Fontecha J Fontecha K Wimer <br /> MS/MSD <br /> Batch# 4060382 4060382 4060382 4060382 BLK061094 <br /> Date Prepared 6/16/94 6/16/94 6/16/94 6/16/94 6/10/94 <br /> Date Analyzed 6/16/94 6/16/94 6/16/94 6/16/94 6/13/94 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 HP-313 <br /> Conc Spiked 20 frg/L 20 fug/L 20 pg/L 60 fug/L 300 fug/L <br /> Matrix Spike <br /> %Recovery 95 90 90 93 78 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 95 95 95 84 <br /> Relative% <br /> Difference 51 54 54 21 74 <br /> LCS Batch# 3LGS061694 3LOS061694 3LCS061694 3LCS061694 BLK061094 <br /> Date Prepared 6/16/94 6/16/94 6/16/94 6/16/94 6/10/94 <br /> Date Analyzed 6/16/94 6/16/94 6/16/94 6/16/94 6/13/94 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 HP-313 <br /> LCS % <br /> Recovery 99 97 105 102 78 <br /> L %Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 28-122 <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 /> 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 /> interference,the LCS recovery is to be used to validate the batch <br /> Ke <br /> Project Ma ger <br /> 4060357 M PD <4> <br />