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Q U A L I T Y C 0 N T R 0 L R E S U L T S <br /> Job Number 200279 Report Date. 02/18/2000 <br /> CUSTOMER IT Group PROJECT* Southland - Martinez ATTN Rhonda Teicheira <br /> QC Type Description Reag. Code Lab ID j Dilution Factor Date Time <br />' MS Matrix Spike 09111501 200299-4 02/11/2000 0049 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br />' Benzene 44 583 50 0 64 87 9 39-150 <br /> Ethyibenzene 41 56 50 2 01 79 1 32-160 <br /> Methyl-t-Butyl Ether (MTBE) 256 07 250 0 00 102 4 50-150 <br />' Toluene 43 834 50 0 54 86 6 46-148 <br /> Xylenes (total) 127 33 150 1 73 83 7 75-125 <br />' MSD Matrix Spike Duplicate 09111501 200299-4 02/11/2000 0115 <br /> Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 45 504 44.583 50 0 64 89 7 39-150 <br /> 2 20 <br />' Ethylbenzene 41 726 41.56 50 2 01 79.4 32-160 <br /> 0 20 <br /> Methyl-t-Butyl Ether (MISE) 251 138 256.07 250 0 00 100.5 50-150 <br /> 2 25 <br /> 1 iene 44 273 43.834 50 0 54 87.5 46-148 <br /> 1 20 <br /> enes (total) 127 926 127.33 ISO 1 73 84.1 75-125 <br /> 0 20 <br /> Test Method EPA 82608 Batch 11004 Analyst gfb <br /> Method Description Volatile Organics by GC/MS Units ug/L <br /> 1 MS Matrix Spike 00012401 200240-2 02/01/2000 2013 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc. Result * Limits F <br />' tert-Butyl Alcohol (TBA) 1263 91 1000 000000 0 126 4 34-182 <br /> Di-Isopropyl Ether 51.46 50 000000 0 102.9 60-131 <br /> Ethyl Cert-Butyi Ether (ETBE) 51 15 50 000000 0 102.3 64-138 <br />' tert-Amyl Methyl Ether 52 20 50 000000 0 104 4 67-154 <br /> Methyl-t-Butyl Ether (MTBE) 119 26 100 000000 0 16 119 1 71-142 <br /> 1,2-Dichloroethane 10 68 10 000000 0 106 8 70-130 <br /> 1,2-Dibromoethane (EDB) 10 86 10 000000 0 108 6 70-130 <br /> MSD Matrix Spike Duplicate 00012401 200240-2 02/01/2000 2041 <br /> Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits F <br />' tert-Butyl Alcohol (TBA) 1255 29 1263 91 1000 000000 0 125 5 34-182 <br /> 1 19 <br /> Di-Isopropyl Ether 48 04 51.46 50 000000 0 96.1 60-131 <br /> 7 24 <br />' Ethyl Cert-Butyl Ether (ETBE) 47.59 51 15 50 000000 0 95 2 64-138 <br /> 7 29 <br /> tert-Amyl Methyl Ether 48 48 52 20 50 000000 0 97.0 67-154 <br /> 7 27 <br /> 0yL-t-ButyL Ether (MTBE) 106 41 119.26 100.000000 0 16 106 2 71-142 <br />' 11 31 <br /> Page 12 * %=% REC, R=RPD, A=ABS Diff D=% Diff <br />