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a)—4 SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM e Concord, California 94520 <br /> 14W (510) 686-9600 FAX (510) 686-9689 <br /> aprealian Engineering, Inc Client Project ID Unocal, 7303 Pacific Ave , Stockton <br /> 401 Stanwell Dr, Ste 400 Matrix Water <br /> Concord, CA 94520 <br /> Attention Mardo Kapreallan, P E QC Sample Group 3060894-897 Reported Jul 1, 1993 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 <br /> Analyst J F J F J F J F K Winner <br /> Cone Spiked 20 20 20 60 300 <br /> Units ug/L ug/L pg/L ug/L Y9/L <br /> LCS Batch# 2LCS062393 2LCS062393 2LCS062393 2LCS062393 BLK062493 <br /> I <br /> Date Prepared 6/23/93 6/23/93 6/23/93 6/23/93 6/24/93 <br /> Date Analyzed 6/23/93 6/23/93 6/23/93 6/23/93 6/29/93 <br /> Instrument I D # HP 4 HP-4 HP 4 HP 4 HP-3A <br /> LCS % <br /> 10 Recovery 94 98 98 107 98 <br /> Control Limits 70-130 70-130 70-130 70-130 80-120 <br /> I <br /> I <br /> I <br /> I <br /> I <br /> MS/MSD <br /> Batch# 3060884 3060884 3060884 3060884 BLK062493 <br /> Date Prepared 6/23/93 6/23/93 6/23/93 6/23/93 6/24/93 <br /> Date Analyzed 6/23/93 6/23/93 6/23/93 6/23/93 6/29/93 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 HP-3A <br /> Matrix Spike <br /> % Recovery- 90 90 95 96 98 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 90 90 90 95 95 <br /> Relative% <br /> Difference 00 00 54 10 38 <br /> SEQUOIA ANALYTICAL Please Note <br /> _ r The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> I preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> k4( <br /> —� validation of sample batch results Due to matrix effects,the QC limits for IVIS/MSDs are advisory only <br /> and are not used to accept or reject batch results <br /> Alan 8-Kemp <br /> Project Manager -� <br /> 3060894 KEI <6> <br />