Attachment_B-_OCU_Certificate_of_Analysis-NWRF_Biosolids_09-16-2019.pdf

This document is a Certificate of Analysis from the Orange County Utilities Central Laboratory for sludge samples collected on September 16, 2019, from the Northwest Water Reclamation Facility. The laboratory analysis details comprehensive testing of sludge samples for various chemical and biological parameters, including metals, wet chemistry analyses, pesticides, PCBs, and semisvolatile compounds. The analysis was conducted under Workorder ID 1909237 and Project ID NWRF/PP 091719, with samples collected and submitted by Wastewater Staff.

The laboratory report provides a detailed breakdown of chemical composition, including total nitrogen (5.71% D.W.), total phosphorus (2.40% D.W.), and various metal concentrations such as copper (302 mg/kg D.W.) and zinc (648 mg/kg D.W.). The sludge was graded as a Grade I material according to Chapter 17-7, which indicates compliance with chemical criteria for metals and other compounds. The analysis was performed using multiple EPA-approved methods, and the results were certified by the Orange County Utilities Central Laboratory, with a NELAP (National Environmental Laboratory Accreditation Program) ID of E53398, ensuring quality and reliability of the testing process.