Weldon Spring Quarry/Plant/Pits (USDOE/Army)
NPL SiteSt. Charles County, MO
According to the EPA Superfund Enterprise Management System, Weldon Spring Quarry/Plant/Pits (USDOE/Army) in St. Charles County, MO is listed with NPL status NPL Site. Its Hazard Ranking System (HRS) score is 58.60. The public extract catalogs 93 contaminant records for this site. EPA marks construction of the cleanup remedy as complete. NPL listing is a cleanup-authority designation, not a measured health-risk score.
Superfund National Priorities List inclusion (status and HRS score shown above) is the EPA's formal designation that a contaminated site qualifies for long-term federal cleanup authority under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). A federal-facility classification means the site is owned or operated by a federal agency, which routes cleanup responsibility differently than a privately owned site.
"Construction Complete" (status shown above) is an EPA milestone marking that the physical remedy work is finished, not that the site has exited EPA oversight; long-term monitoring can continue afterward. Deletion from the NPL is a separate, later step the EPA takes only once it determines every planned response action is finished.
NPL listing is a cleanup-authority designation in the EPA record, not a quantitative health-risk score. HRS scores of 28.50 or above qualify a site for the NPL under the EPA screening model (toxicity, pathways, waste quantity, and affected population factors). For current site conditions and official community notices, see the EPA Regional Superfund profile and the Missouri environmental agency.
What is the cleanup status of this Superfund site?
Contaminants
| Contaminant | Media |
|---|---|
| 1,3,5-TRINITROBENZENE | Solid Waste |
| 1,3-DINITROBENZENE | Groundwater |
| 2,4,6-TRINITROTOLUENE | Groundwater |
| 2,4,6-TRINITROTOLUENE | Soil |
| 2,4,6-TRINITROTOLUENE | Solid Waste |
| 2,4-DINITROTOLUENE | Groundwater |
| 2,6-DINITROTOLUENE | Groundwater |
| 2,6-DINITROTOLUENE | Solid Waste |
| 2-METHYLNAPHTHALENE | Soil |
| ANTIMONY | Sludge |
| ARSENIC | Sediment |
| ARSENIC | Sludge |
| ARSENIC | Soil |
| ARSENIC | Solid Waste |
| ASBESTOS | Debris |
| BARIUM | Sediment |
| BARIUM | Sludge |
| BERYLLIUM | Sludge |
| CADMIUM | Sludge |
| CHROMIUM | Soil |
| CHROMIUM(III) CHLORIDE | Sediment |
| CHROMIUM(III) CHLORIDE | Sludge |
| CHROMIUM(VI) | Sediment |
| CHROMIUM(VI) | Sludge |
| COBALT | Sediment |
| COBALT | Sludge |
| COPPER | Sediment |
| COPPER | Sludge |
| FLUORIDE | Sludge |
| HEAVY METALS | Liquid Waste |
| HYDROGEN FLUORIDE | Liquid Waste |
| LEAD | Sediment |
| LEAD | Sludge |
| LEAD | Soil |
| LEAD | Solid Waste |
| MANGANESE | Sediment |
| MANGANESE | Sludge |
| MERCURY | Sludge |
| MOLYBDENUM | Sludge |
| NICKEL | Sediment |
| NICKEL | Sludge |
| NICKEL | Solid Waste |
| NITRATE | Groundwater |
| NITRATE | Soil |
| NITRITE | Soil |
| NITROBENZENE | Groundwater |
| POLYCHLORINATED BIPHENYLS (PCBs) | Liquid Waste |
| POLYCHLORINATED BIPHENYLS (PCBs) | Sediment |
| POLYCHLORINATED BIPHENYLS (PCBs) | Sludge |
| POLYCHLORINATED BIPHENYLS (PCBs) | Soil |
| POLYCHLORINATED BIPHENYLS (PCBs) | Solid Waste |
| POLYCYCLIC AROMATIC HYDROCARBONS (PAHS) | Soil |
| POLYCYCLIC AROMATIC HYDROCARBONS (PAHS) | Solid Waste |
| RADIUM-226 | Sediment |
| RADIUM-226 | Sludge |
| RADIUM-226 | Soil |
| RADIUM-226 | Solid Waste |
| RADIUM-228 | Sediment |
| RADIUM-228 | Sludge |
| RADIUM-228 | Soil |
| RADIUM-228 | Solid Waste |
| SELENIUM | Sludge |
| SELENIUM | Solid Waste |
| SILVER | Sludge |
| SODIUM HYDROXIDE | Liquid Waste |
| SOLVENTS | Liquid Waste |
| SULFURIC ACID | Liquid Waste |
| THALLIUM | Sludge |
| THALLIUM | Soil |
| THORIUM-230 | Sediment |
| THORIUM-230 | Sludge |
| THORIUM-230 | Soil |
| THORIUM-230 | Solid Waste |
| THORIUM-232 | Sediment |
| THORIUM-232 | Sludge |
| THORIUM-232 | Soil |
| THORIUM-232 | Solid Waste |
| TRIBUTYL PHOSPHATE | Liquid Waste |
| TRICHLOROETHENE | Groundwater |
| URANIUM | Groundwater |
| URANIUM | Sediment |
| URANIUM | Sludge |
| URANIUM | Solid Waste |
| URANIUM-235 | Sediment |
| URANIUM-235 | Sludge |
| URANIUM-238 | Sediment |
| URANIUM-238 | Sludge |
| URANIUM-238 | Soil |
| URANIUM-238 | Solid Waste |
| VANADIUM | Sediment |
| VANADIUM | Sludge |
| ZINC | Sediment |
| ZINC | Sludge |
Location
Other Superfund Sites in Missouri
| Site Name | Status | HRS Score |
|---|---|---|
| Annapolis Lead Mine | Deleted NPL Site | 56.67 |
| Armour Road | NPL Site | 50.00 |
| Bee Cee Manufacturing Co. | NPL Site | 28.59 |
| Big River Mine Tailings/St. Joe Minerals Corp. | NPL Site | 84.91 |
| Compass Plaza Well TCE | NPL Site | 50.00 |
| Conservation Chemical Co. | NPL Site | 29.85 |
| Ellisville Site | NPL Site | 0.00 |
| Fulbright Landfill | NPL Site | 40.60 |
| Kem-Pest Laboratories | Deleted NPL Site | 33.89 |
| Lake City Army Ammunition Plant (Northwest Lagoon) | NPL Site | 33.62 |
How does this site's HRS score compare in Missouri?
Of the 39 Missouri Superfund sites with a scored Hazard Ranking System (HRS) evaluation, Weldon Spring Quarry/Plant/Pits (USDOE/Army) ranks #5 by score (58.60).
Either side of it: Washington County Lead District - Richwoods (76.81), Southwest Jefferson County Mining (70.71), Madison County Mines (58.41), Annapolis Lead Mine (56.67)
Frequently Asked Questions
What is the Weldon Spring Quarry/Plant/Pits (USDOE/Army) Superfund site? ▼
What does NPL listing mean for Weldon Spring Quarry/Plant/Pits (USDOE/Army)? ▼
What is the HRS score for Weldon Spring Quarry/Plant/Pits (USDOE/Army)? ▼
What contaminants are at the Weldon Spring Quarry/Plant/Pits (USDOE/Army) site? ▼
What is the cleanup status of Weldon Spring Quarry/Plant/Pits (USDOE/Army)? ▼
NPL listing is a cleanup-authority designation in the EPA record, not a quantitative health-risk score. See Superfund Sites Explained for how the National Priorities List, Hazard Ranking System, and cleanup phases work.
Read our methodology - how this data is sourced, computed, and verified.