SOW with attachments - Groundwater RemediationPart-4.pdf

This document is Attachment J to a federal contract opportunity, containing Quality Assurance/Quality Control (QA/QC) data for volatile organic compounds (VOCs) analysis with SDG ID GCV93273.

The attachment presents detailed laboratory analytical results for multiple volatile compounds measured across three groundwater sample batches (840184, 839918, and 839960) analyzed by Phoenix Environmental Laboratories, Inc. The data includes columns for various quality control parameters: blank readings, method detection limits (Blk RL), Laboratory Control Sample (LCS) and LCS Duplicate (LCSD) results expressed as percentages, LCS Relative Percent Difference (RPD), Matrix Spike (MS) and Matrix Spike Duplicate (MSD) data, MS RPD, percent recovery limits (70-130%), and Relative Percent Difference limits (20%). The laboratory performed LCS and LCS Duplicates instead of matrix spike and matrix spike duplicate analyses for certain batches. An additional criterion notes that up to 10% of LCS/LCSD compounds can fall outside acceptance criteria if recovery is 40-160%. The QA/QC data encompasses over 100 chemical parameters including chlorinated hydrocarbons, brominated compounds, ethers, benzene derivatives, and other volatile organic compounds commonly analyzed in environmental groundwater assessments. The report is signed by Phyllis Shiller, Laboratory Director, dated May 18, 2026, and includes notations identifying compounds outside specified recovery limits and RPD specifications. This attachment serves as the quality assurance documentation supporting the analytical work performed on the groundwater samples.