A02. PWS Attach 3 - Analytical Methods v2.docx

This is a Performance Work Statement Attachment specifying the analytical methods and technologies required for trace metals analysis across multiple sample matrices. The attachment establishes EPA-approved methodologies for analyzing trace metals in fresh water, salt water, soil, sediment, and tissue samples using Inductively Coupled Plasma Mass Spectrometry (ICP/MS) as the primary method, with ICP/OES as an alternative for freshwater analysis under EPA 200.7. For specialized analyses, the document requires Cold Vapor Atomic Fluorescence (CVAF) for mercury detection across all matrices per EPA 1631/1631E, Hydride Generation-Continuous Thermospray Gas Chromatography-Atomic Absorption Spectroscopy (HG-CT-GC-AAS) for arsenic speciation per EPA 1632, and Ion Chromatography with post-column reaction and UV-Vis spectrophotometry for hexavalent chromium speciation per EPA 1636.

The attachment also addresses sample preparation requirements, including digestion procedures and preconcentration methods, with vendors required to submit Standard Operating Procedures (SOPs) for approval. Media and supplies cleaning protocols must comply with EPA 1669 standards for equipment such as Teflon or silicone tubing, in-line sampling filters, and strainers. This specification supports the Defense Health Agency Contracting Activity's solicitation for trace metals analysis services under solicitation number HT942726RE010, classified as NAICS 541380 (Testing Laboratories) with a $19M size standard, issued under full and open competition.