Under direction, performs a variety of complex and difficult technical work in support of the City's Wastewater and Environmental Programs divisions, including sewer and storm water inspections and monitoring of commercial food, automotive, industrial, and commercial facilities; administers the Industrial Waste Pretreatment Program for the Hale Avenue Resource Recovery Facility NPDES permit in accordance with 40 CFR Part 403 regulations, including significant industrial facility inspections, sampling, permit writing, issuing notices of violation and reporting to the Regional Water Quality Control Board and EPA. Determines sampling locations and methods; collects representative samples of wastewater or storm water from industrial, commercial, residential, and institutional sources, various interceptors, and storm drains; utilizes appropriate containers and preservation methods; performs field and laboratory tests on samples collected; observes and records field conditions, flow meter readings, field test results, and other data relevant to sampling conditions and complete documentation.