Altamont Landfill Full Scale, Alameda County, CA USA
(EPA Region 9)
Site Type:
MSW landfill
Superfund Site:
No
Federal Facility:
No
Bottom liner:
No
Climate:
Semi-arid.
Annual Precipitation:
13 inches
Geologic Hydrogeologic Setting:
The facility is near the crest of the Altamont Hills. The regional topography is
characterized by moderately to steeply rolling hills and narrow valleys that have a
northwest trend. The lithology beneath the facility property generally consists of mantled
Quaternary deposits unconformably overlying the Cretaceous Panoche
Formation. The Quaternary deposits generally consist of colluvium on the hills
and hillsides and alluvium in the valleys. These deposits are generally moderately
to highly plastic clays with minor amounts of fine-grained sand and bedrock
fragments with residual soil up to 25 feet thick. The Panoche Formation consists
of inner bedded claystone, siltstone, and massive indurated sandstone, which are
representative marine turbidite sequence. The formation generally strikes
northwest and dips east-northeast at 10 to 30 degrees on the east limb of the
Altamont Anticline. The depth of weathering in the Panoche Formation is variable
and ranges from about 10 to 100 feet below ground surface.
Groundwater is encountered at the site at depths ranging from approximately 140 feet bgs on hilltops to the ground surface in the valley bottoms where Fill Area 2 will be constructed. Groundwater occurs primarily in the upper weathered portions of the Panoche Formation bedrock and in the valley alluvium. Shallow groundwater at the site generally occurs as unconfined water table conditions. Deeper groundwater within the Panoche Formation Bedrock may occur under confined conditions. In general, the groundwater level fluctuates approximately 2 to 6 feet seasonally.
Project Information
Project Name:
Monolithic Evapotranspiration at Altamont Landfill Full Scale, CA
Project Scale:
Full scale
Project Status:
Proposed
Regulatory Status:
Conditionally approved
Monitoring System:
Because the ACAP findings were less than desirable, the Order requires monitoring of the cover placed over the closing unit. If the results are favorable then an alternative ET type cover will be approved for the remaining parts of the active landfill.
Cover Information
Cover Type:
Monolithic Evapotranspiration
Design of Cover:
Two feet of soil placed loosely at below-optimum moisture over two feet of compacted soil
Types of Vegetation:
Native annual and perennial species selected to maximize removal of moisture from the cover.
Drainage Layer:
No
Biointrusion Layer:
No
Gas Collection Layer:
No
Reference(s)
CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD
CENTRAL VALLEY REGION
ORDER NO. R5-2009-0055
WASTE DISCHARGE REQUIREMENTS
FOR
WASTE MANAGEMENT OF ALAMEDA COUNTY, INC.
ALTAMONT LANDFILL AND RESOURCE RECOVERY FACILITY
CLASS II AND CLASS III MUNICIPAL SOLID WASTE LANDFILLS AND
CLASS II SURFACE IMPOUNDMENTS
CONSTRUCTION, OPERATION, AND CORRECTIVE ACTION
ALAMEDA COUNTY http://www.waterboards.ca.gov/centralvalley/board_decisions/adopted_orders/alameda/r5-2009-0055.pdf
