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COULA CORE LABORATORIES ' Q U A L I T Y C 0 N T R 0 L R E S U L T S Job Number 991022 Report Date 06/15/1999 �CUSTOMER PROJECT Southland - Marfinez ATTN Shelby Lathrop Description Reag Code Lab ID Dilution Factor Date Time Test Method EPA 82606 Batch - 6679 Analyst gfb Method Description Volatile Organics by GC/MS Units ug/L MS Matrix Spike 09060402 991024-6 06/10/1999 1536 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F ert-Butyl Alcohol (TBA) 692 34 1000 000000 0 69 2 48-194 i-isopropyl Ether 48 62 50 000000 0 97 2 53-149 thyl tert-Butyl Ether (ETRE) 37 76 50 000000 0 75 5 53-148 tert-Amyl Methyl Ether 39 32 50 000000 0 78 6 49-158 ethyl-t-Butyl Ether (MTBE) 79 24 100 000000 3 28 76 0 44-190 ,2-DichLoroethane 9 05 10 000000 0 91 81 4 70-130 MSD Matrix spike Duplicate 09060402 991024-6 06/10/1999 1604 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F tert-Butyl Alcohol (TBA) 861 56 692 34 1000 000000 0 86 2 _ 48-194 22 21 Y go opropyl Ether 52 55 48 62 50 000000 0 105 1 53-149 8 15 Ethyl tert-Butyl Ether (ETRE) 42 39 37 76 50 000000 0 84 8 53-148 12 28 lert-AmyL Methyl Ether 42 46 39 32 50 000000 0 84 9 49-158 8 48 ethyl-t-Butyl Ether (MTBE) 120 01 79 24 100 000000 3 28 116 7 44-190 41 21 Y 112-Dichloroethane 10 01 9 05 10 000000 0 91 91 0 70-130 10 30 MS Matrix Spike 09060402 991022-1 06/10/1999 2341 IN Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F tert-Butyl Alcohol (TBA) 762 84 1000 000000 0 76 3 34-182 li-Isopropyl Ether 43 43 50 000000 0 86 9 60-131 thyl tert-Butyl Ether (ETBE) 36 18 50 000000 0 72 4 64-138 ert-AmyL Methyl Ether 40 22 50 000000 0 80 4 67-154 Methyl-t-Butyl Ether (MTBE) 107 20 100 000000 6 47 100 7 71-142 ,2-Dichloroethane 8 95 10 000000 0 89 5 70-130 MSD Matrix Spike Duplicate 09060402 991022-1 1 :�:[06/11/1999 0010 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F rt-Butyl Alcohol (TBA) 869 94 762 84 1000 000000 0 87 0 _ 34-182 13 19 i-Isopropyl Ether 51 94 43 43 50 000000 0 103 9 60-131 18 24 IthyL tert-Butyl Ether (ETBE) 41 75 36 18 50 000000 0 83 5 64-138 14 29 myl Methyl Ether 41 36 40 22 50 000000 0 82 7 67-154 3 27 Page 15 * %=Y. REC, R=RPD, A=ABS Diff D=% Diff 1111 rove-�sd �««P,s«sco«an„n ,rrs mpn,e„ va K o„no�. s eH ri sono K,rrr �,,,.r��r°wr,r>� �, ono,oc� wwr�,�w nv�s �r ,ti a nre�n�s A p ,a eu�9em m 3 nos,i�d j e, o,Co«�a�o„«es a L�oo s r err r, ,k s ,y o .m,, wr�,a r.:,y rr<n ' ]'s�n In o rope tY.1110 td IDI n 1-1- J such v0. tippnl r ,Ino[ w] �w4oten i r•cr ��