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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br />+ prealian Engineering, Inc Client Project ID I Unocal, 601 E Kettleman Lane, Loco <br /> 2401 Stanwell Dr, Ste 400 Matrix Water <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E ©C Sample Group 3031212-1220 Reported Mar 30, 1993 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst JF JF JF JF <br /> Cone. Spiked. 20 20 20 60 <br /> Units: N9/L p9/L jug/L Fr9/L <br /> LCS Batch# 3LCSW2993 3LCS032993 3LCS032993 3LCS032993 <br /> Date Prepared 3/29/93 3/29/93 3/29/93 3/29/93 <br /> Date Analyzed 3/29/93 3/29/93 3/29/93 3/29/93 <br /> Instrument I D.# HP-5 HP-5 HP-5 HP-5 <br /> LCS % <br /> Recovery 128 114 108 129 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch#- 3031220 3031220 3031220 3031220 <br /> Date Prepared 3/29/93 3/29/93 3/29/93 3/29/93 <br /> Date Analyzed 3/29/93 3/29/93 3/29/93 3/29/93 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Matrix Spike <br /> % Recovery 125 110 110 130 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 130 115 110 130 <br /> Relative% <br /> Difference 39 44 00 00 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD s are advisory only <br /> and are not used to accept or reject batch results <br /> cott A Chieffo <br /> Project Manager 3031212 KEI <4> <br />