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~i SLAB CORE LABORATORIES D U A L I T Y C O N T R O L R E S U L T S Job Number: 973559 Date: 01/21/98 CUSTOMER: GreysCOne PROJECT: COSTILLA CO 484.05 ATTN: Nick Mathis oC Type Description Reag. Code Lab 1D Dilution Factor Date Time MB Method Blenk 4126 01!05/98 2107 Parameter/Test Description OC Result OC Result True Value Orig. Value Calc, Result * Limits Endosulfan sulfate ND 0.066 Endrin ND 0,006 Endrin aldehyde ND 0.023 Heptachlor ND 0.003 Heptachlor epoxide ND 0.083 Toxaphene ND 0.24 LCS Laboratory Control Sample 09708248 0.01 01/05/98 2137 Parameter/Test Description DC Result 0C Result True Value Orig. Value Cal c. Result * Limits Aldrin 12.82 12.380000 103.6 X 60-150 gamma-BHC (Li ndane) 10.07 12.500000 80.6 X 60-150 4,4'-DDT 23.38 25.080000 93.2 X 60-150 Dieldrin 21.83 25.120000 86.9 X 60-150 Endrin 22.62 24.800000 91.2 X 60-150 LCD Laboratory Control Sample Duplicate 0970829B 0.01 01!05!98 2207 Parameter/Test Description DC Result OC Result True Value Orig. Value talc. Result * Limits Aldrin 13.75 12.82 12.380000 111.1 X 60-150 7.0 R 15 Samna-BHC (Lindane) 8.63 10.07 12.500000 69.0 X 60.150 14.4 R 15 4,4'-DDT 22.65 23.38 25.080000 90.3 X 60-150 3.2 R 15 Dieldrin 25.08 21.83 25.120000 99.8 X bD-150 13.9 R 15 Endrin 23.85 22.62 24.800000 96.2 X 60.150 5.3 R 15 MB Method Blenk 4145 01(05/48 2335 Parameter/Test Description OC Result OC Result True Value Orig. Value Calc. Result * Limits Aldrin ND 0.004 alpha-BHC ND 0.003 beta-BHC ND 0.006 def to-BNC ND D.009 ganma-BHC (Lindane) ND 0.004 Chlordane NO 0.014 4,4'-DDD ND 0.011 4,4~-DDE ND 0.004 4,4~-DDT ND 0.012 Dieldrin ND 0.002 EMosulfan 1 ND 0.014 Endosulfan fI ND 0.004 Endosulfan sulfate ND 0.066 Endrin ND 0.006 Page 9 * X-X REC R-RPD A-ABS Diff. D-X Diff. .. M~ w,o