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COULAB CORE LABORATORIES Q UAL I T Y C O N T R O L R E S U L T 5 Job Number 990890 Report Date 05/26/1999 CUSTOMER: IT gaup PROJECT: Southland - Martinez ATTR Shelby Lathrop QC Type Description Reag Code Lab ID Dilution Factor Date Time ' Test Method EPA 82608 Batch 6410 Analyst vz Method Description Volatile Organics by GC/MS Units ug/L MS Matrix Spike 49051803 990876-23 05/24/1999 1411 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * limits 'tert-Butyt Alcohol (TBA) 998 53 1000 000000 0 99 9 r 70-130 Di-Isopropyl Ether 50 76 50 000000 0 101 5 70-130 Ethyl tert-Butyl Ether (ETBE) 48 23 50 000000 0 96 5 70-130 tert-Amyl Methyl Ether 48 91 50 000000 0 97 8 70-130 Methyl-t-Butyl Ether (MTBE) 84 31 100 000000 0 83 83 5 70-130 '1,2-Dichloroethane 8 13 10 000000 0 81 3 70-130 1,2-Dibromoethane (EDB) 9 14 10 000000 0 91 4 70-130 MSDMatrix Spike Duplicate 09059803 990876-23 05/24/1999 1440 Parameter/Test Description QC Result QC Result True Value orig Value CaLc Result * Limits �t-ButyL Alcohol (TBA) 1245 59 998 53 1000 000000 0 124 6 70-130 22 25 sopropyl Ether 54 09 50 76 50 000000 0 108 2 70-130 6 25 Ethyl tert-Butyl Ether (ETBE) 54 95 48 23 50 000000 0 109 9 70-130 13 25 'tert-Amyl Methyl Ether 56 24 48 91 50 000000 0 112 5 70-130 14 25 Methyl-t-Butyl Ether (MTBE) 108 96 84 31 100 000000 0 83 108 1 70-130 26 30 '1,2-Dichloroethane 9 84 8 13 10 000000 0 98 4 70-130 19 25 1,2-Dibromoethane (EDB) 10 35 9 14 10 000000 0 103 5 70-130 12 25 MB Method Blank 05/2511999 1002 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits �tert-Butyl Alcohol (TBA) 0 Di-Isopropyl Ether 0 Ethyl tert-Butyl Ether (ETBE) 0 FIert-Amyl Methyl Ether 0 ethyl-t-Butyl Ether (MTBE) 0 ,2-Dichloroethane 0 1,2-Dibromoethane (EDB) 0 LCS Laboratory Control. Sample 09051803 05/25/1999 1031 Parameter/Test Description QC Result QC Result True Value Orig Value CaLc Result * Limits ert-Butyl Alcohol (TBA) 821 10 1000 000000 82 1 70-130 tti-isopropyl Ether 43 24 50 000000 86 5 70-130 4vtent-Butyl Ether (ETBE) 42 51 50 000000 85 0 70-130 Amyl Methyl Ether 42 51 50 000000 85 0 70-130 ' Page 7 * %=% REC, R=RPD, A-ABS Diff D=% Diff Tlo ylic li le 111 91 ons n rl 11 1 1 nns r[tl In[I n[It v �L t [alsot11i1 1 1v n II 3 W 11 s l l 1 s v 1 Ip wlr ['s s 3 I c l [1rs 1 I a 1 n� 1 ul T1 a sn a ils 1 1 0[ 11[rl Vn ti L n I'r' es[`I;IlelolYo HL'lls lla e[nn yl nw[Owl Scll cSw � s W w Iu v nl � I�wl -e w.l l ufr 1 v I fx I Ivl ., 54 1 u [ Ill,ci 1 0[ alo II IfiM[ 5 d Yol alH Inp [ 1 vwlt tlw xl po II111 .. I wnM 1 IC �I I