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i (a RA W H Data Validation Report To: Eric Rowney —SAC Date: June 11, 2012 From: Sarah Von Raesfeld —WCK Project: Marley Cooling Tower Report Ref: GeoAnalytical SDG#s Y2D2412, Job Number:1881740 Y2D2510, Y2D2605, Y2D3003, File Reference: Y2E0208 This data validation report has been prepared by MWH and summarizes the review of analytical data submitted by GeoAnalytical Laboratories of Turlock, California (GeoAnalytical) for samples collected between April 24, 2012 and May 2, 2012 at the above referenced site. A list of respective sample identifications is included in Table A. Forty-six (46) primary field samples, seven (7) field duplicates, and ten (10)field quality control (QC) samples were submitted. The following samples were submitted as field duplicate pairs: Duplicate Sample MW-213 Dup MW-213 MW-320 Dup MW-320 MW-303 (Duplicate) MW-303 MW-301 Dup MW-301 1-11 Dup 1-11 MW-206 Dup MW-206 MW-448D Dup MW-448D Samples were analyzed by one or more of the following methods: • Hexavalent chromium by United States Environmental Protection Agency(USEPA) Method SW7199 • Dissolved arsenic, chromium, copper, iron, and manganese by USEPA Method SW6020 • Sulfate by USEPA Method 300.0 • Total dissolved solids (TDS) by Standard Method SM2540C • Total organic carbon (TOC) by Standard Method SM5310C Results were reviewed in accordance with the appropriate methods listed above. In addition, the USEPA Contract Laboratory Program National Functional Guidelines for Inorganic Data Review (USEPA 2004) were used to provide overall guidance for the validation process. The data review included an evaluation of the following QC parameters based on standard performance criteria presented in these documents: • Analytical Holding Times/Sample Preservation • Method Blanks, Equipment Rinse Blanks, and Field Blanks • Laboratory Control Sample/ Laboratory Control Sample Duplicate (LCS/LCSD) Performance Page 1 of 6