Overview
Hidden Valley Quarry is a stormwater outfall in Juneau, Alaska, United States. It manages runoff from quarry operations under the Clean Water Act regulatory framework.
Hidden Valley Quarry is a stormwater outfall located in Juneau, Alaska, United States. It serves the Hidden Valley Quarry area, managing stormwater discharge from industrial quarry activities. The facility is operational and falls under the jurisdiction of the US EPA's National Pollutant Discharge Elimination System (NPDES) permitting program. As a stormwater outfall associated with quarrying (NAICS 212319, 212321), the facility handles runoff from mining and rock crushing operations. In Alaska, stormwater management for industrial sites is regulated under the NPDES Multi-Sector General Permit (MSGP), which requires controls for sediment, metals, and other pollutants typical of quarry operations. The environmental significance of this outfall lies in its proximity to the Gastineau Channel and surrounding watersheds. Proper stormwater management is critical to protect water quality in Juneau's coastal ecosystems, which support salmon runs and other aquatic life. The facility's compliance with permit conditions helps mitigate impacts from industrial runoff.
Environmental context
Juneau is situated in the Tongass National Forest, a temperate rainforest with high annual precipitation. Stormwater runoff from quarry operations can carry sediment, heavy metals, and other pollutants into nearby waterbodies. The Gastineau Channel and adjacent streams are important habitats for Pacific salmon and other species. Effective stormwater management is essential to prevent degradation of these sensitive ecosystems.
Frequently asked questions
Hidden Valley Quarry stormwater outfall is located on Hidden Valley Haul Road in Juneau, Alaska, United States.
It is a stormwater outfall that manages runoff from quarry operations, classified under NAICS codes 212319 (Other Crushed and Broken Stone Mining and Quarrying) and 212321 (Construction Sand and Gravel Mining).
As an industrial stormwater outfall in the United States, it operates under the Clean Water Act and is subject to the NPDES Multi-Sector General Permit (MSGP) for stormwater discharges associated with industrial activity.
Common pollutants include sediment, suspended solids, heavy metals (e.g., copper, zinc), and pH alterations from rock crushing and mining activities.
Proper stormwater management prevents pollutants from entering local waterbodies like the Gastineau Channel, protecting salmon habitats and maintaining water quality in the sensitive coastal ecosystem of Southeast Alaska.
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