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i (a RA W H Data Validation Report To: Eric Rowney —SAC Date: July 18, 2013 From: Sarah Von Raesfeld —WCK Project: Marley Cooling Tower Report Ref: GeoAnalytical SDG#s Z3A2405, Job Number:10502719 Z3A2504, Z3A2905, Z3A3015 File Reference: 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 January 24, 2013 and January 30, 2013 at the above referenced site. A list of respective sample identifications is included in Table A. Fifty-three (53) primary field samples, seven (7)field duplicates, and seven (7) field quality control (QC) samples were submitted. The following samples were submitted as field duplicate pairs: Duplicate Sample MW-323 Dup MW-323 MW-9 Dup MW-9 TW-16 Dup TW-16 TW-13 Dup TW-13 MW-321 (1-9) Dup MW-321 (1-9) MW-102 Dup MW-102 MW-4 Dup MW-4 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 • Matrix Spike/Matrix Spike Duplicate (MS/MSD) Sample Performance Page 1 of 6