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Weck Laboratories, Inc. <br /> Anah/Mal Uliboratory StIrVIOes-Since 1964 <br /> Certificate of Analysis <br /> Week Laboratories,Inc <br /> Organophosphorus Pesticides by EPA Method 8141A-Quality Control <br /> Swnple QC Spike RPD <br /> AnaMe Result Result Qualifier Units Level MEC L RPD Limit <br /> Batch W8D0253-EPA 3520B <br /> Prepared:04/07/08 Analyzed:04/17/08 <br /> Mevinphos.............................................. ND ug/1 <br /> Naled....................................................— ND ug/1 <br /> Phorate.................................................... ND ugA <br /> Ronnel.................................................... ND ug/1 <br /> Stirophos................................................. ND ug/1 <br /> Tokuthion(Prodiiofos)........................... No ug/1 <br /> Trichloronate.......................................... No ug/1 <br /> 1C �ID11253-BSI) P par�d,._91/07�MO�__,An 2nL14 17/28 <br /> Surrogate:Triphenylphosphate 0.815 uO 1.00 82 6-173 <br /> Azinphos methyl(Guthion).................... 0,745 ugA 1,00 75 18-159 <br /> Bolstar..................................................... 0.746 ugA 1.00 75 49-148 <br /> Chlorpyrifos............................................ 0.765 ugA 1.00 76 49-143 <br /> Coumaphos............................................. 0.880 ug/1 1.00 89 42-161 <br /> Derneton-o.............................................. 0.776 ug/1 1.00 78 47-132 <br /> Demeton-s............................................... 0.828 ug/1 1.00 83 45-1,47 <br /> Diazinon.................................................. 0.512 uO 1.00 51 46-136 <br /> Dichlorvos.............................................. 0.889 ugA 1.00 89 29-164 <br /> Disulfoton............................................ 0.730 ug/1 1.00 73 46-155 <br /> Ethoprop................................................. 0.900 ugA 1.00 90 54-141 <br /> Fensulfothion.......................................... 0.819 ug/1 1.00 82 54-167 <br /> Fenthion.................................................. 0.737 ug/1 1.00 74 50-143 <br /> Merphos.................................................. 0.818 ug/1 1.00 82 40-185 <br /> Methyl parathion..................................... 0.838 ugA 1.00 84 47-142 <br /> Mevinphos.............................................. 0.872 u&/] 1.00 87 43-145 <br /> Naled....................................................... 0,784 ugA 1.00 78 16-177 <br /> Phorate.................................................. 0.871 ugA 1.00 87 56-134 <br /> Ronnel..................................................... 0.781 u8A 1.00 78 49-140 <br /> Stirophos................................................. 0.722 ug/1 1.00 72 46-146 <br /> Tokuthion(Prothiofos)........................... 0.761 ug/1 1.00 76 52-139 <br /> Trichloronate.......................................... 0.764 ug/1 1.00 76 52-136 <br /> LCS_pu M-BS e ared:04/07/08 Analyzed.I--,- __pff�DO ....... aqt. .................. <br /> Swrogate:TriphLnylphosphaie 0.954 ug/1 1.00 95 6-173 <br /> Azinphos methyl(Guthion).................... 0.971 Q-12 uO 1.00 97 18-159 26 25 <br /> Bolstar..................................................... 0,878 u8/1 1.00 88 49-148 16 25 <br /> Chlorpyrifos............................................ 0.900 uO 1.00 90 49-143 16 25 <br /> Coumaphos............................................. 1.15 Q-12 uO 1.00 115 42-161 27 25 <br /> Demeton-o.............................................. 0.865 ugA 1.00 86 47-132 11 25 <br /> Demeton-s........................................ 0.962 ugA 1.00 96 45-147 15 25 <br /> Diazinon............................................... 0.585 11g11 1.00 58 46-136 13 25 <br /> Lab#:8040302 Page 5 of <br /> 14859 East Clark Avenue,City of Industry,California 91745-1396 (626)336-2139 FAX (626)336-2634 <br /> www.weck]abs.corn 31 <br />