Superfund Information Systems: Site Profile

Superfund Site:

CALIFORNIA GULCH
LEADVILLE, CO

Operable Units

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During cleanup, a site can be divided into a number of distinct areas depending on its complexity. These areas, called operable units (OUs), may address geographic areas, specific problems, or areas where a specific action is required. Examples of typical operable units include construction of a groundwater pump and treatment system or construction of a cap over a landfill.

OU ID Name Types of Contaminants
Present at the Time of
ROD Completion
Cleanup Technologies Selected
in the Decision Document
00 SITEWIDE
01 YAK TUNNEL
  • CADMIUM
  • COPPER
  • LEAD
  • ZINC
  • Clarification (sedimentation, P&T, exsitu)
  • Drainage/Erosion Control (other, NOS)
  • Engineering Control (other, NOS)
  • Hydraulic Control (containment)
  • Hydraulic Control (for water table adjustment)
  • Monitoring
  • Operations & Maintenance (O&M)
  • Treatment (other, NOS, exsitu, onsite)
02 HECLA TAILINGS
03 DRG & W SLAG PILES
  • ARSENIC
  • CADMIUM
  • LEAD
  • ZINC
  • No Action
04 UPPER CAL GULCH
  • ARSENIC
  • CADMIUM
  • COPPER
  • LEAD
  • METALS
  • SULFATE
  • ZINC
05 SMELTERS/MILL SITES
  • ARSENIC
  • CADMIUM
  • LEAD
  • ZINC
  • Institutional Controls
  • No Action
06 HAMM'S TAILINGS/PENROSE DUMP
  • ARSENIC
  • LEAD
  • Containment (other, NOS, onsite)
  • Discharge (other, NOS)
  • Drainage/Erosion Control (dike/berm/levee)
  • Evaporation (P&T, exsitu)
  • Institutional Controls
  • Monitoring
  • Operations & Maintenance (O&M)
  • Treatment (other, NOS, exsitu, onsite)
  • Treatment (other, NOS, onsite)
07 APACHE TAILINGS
  • ARSENIC
  • LEAD
  • Cap (engineered cap)
  • Consolidate (onsite)
  • Drainage/Erosion Control (other, NOS)
  • Excavation
  • Institutional Controls
  • Monitoring
  • Revegetation
  • Slope Stabilization
08 LOWER CAL GULCH
09 RESIDENTIAL SOIL
  • LEAD
10 OREGON GULCH
  • ARSENIC
  • CADMIUM
  • COPPER
  • IRON
  • LEAD
  • SULFATE
  • ZINC
11 ARKANSAS FLOOD PLAIN
  • CADMIUM
  • COPPER
  • LEAD
  • MERCURY
  • ZINC
  • Institutional Controls
  • Monitoring
  • Revegetation
  • Soil Amendments
  • Treatment (other, NOS, insitu)
12 SITE-WIDE WATER QUALITY
  • ARSENIC
  • CADMIUM
  • COPPER
  • LEAD
  • MANGANESE
  • ZINC
  • Institutional Controls
  • Monitoring

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