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} SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM a Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> aprealian Engineering, Inc Client Project ID Unocal #5098, 5606 Pacific Ave, Stockton <br /> 401 Stanwell Dr, Ste 400 Matrix Water <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E OC Sample Goup 3031170-73 Reported Apr 7, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloroethene Trichloroethene Chloro- <br /> benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst- K Nill K Nill K Nill <br /> Cone Spiked 10 10 10 <br /> Units ug/L !19/L Ing/L <br /> LCS Batch# LCSO40293 LCSO40293 LCSO40293 <br /> Date Prepared 4/2/93 4/2/93 4/2/93 <br /> Date Analyzed 4/2/93 4/2/93 4/2/93 <br /> Instrument I D # HP5890/1 HP5890/1 HP5890/1 <br /> LCS % <br /> Recovery 100 95 92 <br /> Control Limits 80--120% 80--120% 80--120% <br /> MS/MSD <br /> Batch# 3031173 3031173 3031173 <br /> Date Prepared 4/2/93 4/2/93 4/2/93 <br /> Date Analyzed 4/2/93 4/2/93 4/2/93 <br /> Instrument I D # HP5890/1 HP5890/1 HP5890/1 <br /> Matrix Spike <br /> % Recovery 98 92 89 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 95 91 <br /> Relative% <br /> Difference 20 32 22 <br /> 0EQU A ANALYT AL 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/MSDs are advisory only <br /> Cott Chieffo and are not used to accept or reject batch results <br /> Project Manager 3031170 KEI <» <br />