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Hodgdon Meadows Maintenance Facility - Replace Failed Oil/Water Separator and Wash Rack

Yosemite National Park » Hodgdon Meadows Maintenance Facility - Replace Failed Oil/Water Separator and Wash Rack » Document List

The proposed project will remove and replace the existing failed oil/water separator at the Hodgdon Meadows maintenance facility. The entire project is contained within the paved area adjacent to the maintenance building in previously disturbed man-made fill. The existing separator has failed and is no longer functioning. Water occasionally backs up into the floor drains inside the shop. Existing separator is installed underneath the existing vehicle wash rack pad, which will also be removed and replaced as part of this project. The project will proceed as follows:

Remove and replace the existing concrete pad and most of the asphalt pavement between the concrete pad and existing outlet manhole.

Clean and rehabilitate the existing grated inlet manhole in the middle of the wash rack pad. Inspect and repair the existing connections to the building floor drains as needed.

Remove the existing sand trap/separator and access hatch, and install a dual chamber combined separator unit.

A piping and pump system will be added to allow oil removal from the separator and transfer to a waste tank with spill containment installed inside the shop where it will be held for disposal by our fuel services vendor.

Install two new access vaults and hatches over the separator.

Reinstall the concrete wash rack pad and slope to drain into the system inlet grate.

Replace the pavement around the wash rack pad and tie into the surrounding pavement. Replace any additional damaged pavement areas surrounding the building as needed.