In 2015, a material transfer station required a treatment solution after exceeding Industrial Stormwater General Permit (ISGP) benchmarks for total suspended solids (TSS), total copper, and total zinc. With no prior treatment in place, the facility needed a system that could fit within its available footprint while effectively reducing contaminants to meet regulatory requirements.

Clear Water Services evaluated multiple treatment options and based on site constraints and treatment needs, the passive stacked media filter system was selected as the most suitable treatment best management practice (BMP).

Clear Water installed the system with a 62gpm treatment capacity. The passive stacked system incorporates gravity settling, sand filtration, and adsorptive media (HS250-GAC) to remove contaminants. Since installation, the system has consistently reduced TSS, total copper, and total zinc to levels comparable to the receiving waters, maintaining compliance with ISGP standards. After more than a decade in operation, this passive treatment approach continues to provide effective and reliable stormwater management for the facility.