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*Alpha Analytical, Inc. 55 Glendale Ave. -Suite 21 -Sparks,Nevada 89431-5778 ® 8 (775)355-1044-(775)355-0406 FAX- 1-800-283-1183 Date: Work Order: 01-Jun-07 QC Summary Reuort 07052320 Method Blank Type MBLK Test Code:EPA Method 7196A File ID: Batch ID:W0523CRS Analysis Date: 05/23/2007 00:00 Sample ID: MBLK-W0523CRS Units:pg/Kg Run ID:WETLAB_0705231 Prep Date: 05/23/2007 Analyte Result PQL SpkVal SpkRefVal %REC LCL(ME) UCL(ME)RPDRefVal %RPD(Limit) Qua[ Chromium(Cr),Hexavalent(+6) ND 2000 Laboratory Control Spike Type LCS Test Code: EPA Method 7196A File ID: Batch ID:W0523CRS Analysis Date: 05/23/2007 00:00 Sample ID: LCS-W0523CRS Units:pg/Kg Run ID:WETLAB_0705231 Prep Date: 05/23/2007 Analyte Result PQL SpkVal SpkRefVal %REC LCL(ME) UCL(ME)RPDRefVal %RPD(Limit) Qual Chromium(Cr),Hexavalent(+6) 10800 2000 12000 90 80 120 Sample Matrix Spike Type MS Test Code: EPA Method 7196A File ID: Batch ID:W0523CRS Analysis Date: 05/23/2007 00:00 Sample ID: 07052320-01AMS Units:pg/Kg Run ID:WETLAB_0706231 Prep Date: 05/23/2007 Analyte Result PQL SpkVal SpkRefVal %REC LCL(ME) UCL(ME)RPDRefVal %RPD(Limit) Qual Chromium(Cr),Hexavalent(+6) 10200 2000 12000 1971 68 75 125 M2 Sample Matrix Spike Duplicate Type MSD Test Code: EPA Method 7196A File ID: Batch ID:W0523CRS Analysis Date: 05/23/2007 00:00 Sample ID: 07052320-01AMSD Units:pg/Kg Run ID:WETLAB_0705231 Prep Date: 05/23/2007 Analyte Result PQL SpkVal SpkRefVal %REC LCL(ME) UCL(ME)RPDRefVal %RPD(Limit) Qual Chromium(Cr),Hexavalent(+6) 2340 2000 12000 1971 3.1 75 125 10170 125.0(20) M2 R58 Comments: Calculations are based off of raw(non-rounded data.However,for reporting purposes,all QC data is rounded to three significant figures.Therefore,hand calculated values may differ slightly. M2=Matrix spike recovery was low,the meth d control sample recovery was acceptable. R58=MS/MSD RPD exceeded the laboratory control limit. Reported in micrograms per kilogram,per clien request.