Classification: Class III, Priority 14
Site Name: Westlake Landfill
Address: Bridgeton, MO 63042 Between Old Rock Hill Road and New
Rock Hill Road east of Earth City, St. Louis County
T 46 N, R 5 E, St. Charles Quadrangle
Waste Type: radionuclides
Quantity: 7000 tons of low level uranium ore wastes
The site is part of an active landfill on the Missouri River floodplain in
St. Louis County.
Present Owner: Westlake Landfill, Inc.,
Bridgeton, MO 63042
Environmental Problems Related to Site:
The site is an active permitted landfill which in the past accepted 7000
tons of low level uranium ore wastes. Excavation at the site in the past
reached the same depth as the groundwater. There is potential for
contamination of groundwater and the Missouri River which is less than one
mile away, directly west of the site.
Remedial Actions at Site:
The site was surveyed prior to expansion in order to separate the
demolition fill area from the area identified «s containing hazardous
The Missouri Department of Natural Resources is the lead agency for this
Area of Concern Related to Site:
The average natural ground elevation is 435 to 440 foot with groundwater
at a shallow depth. The alluvium underlying tho river is one of the most
important aquifers in the state. Consequently, If contamination is
occuring from the landfill, it is threatening a vital aquifer resource.
General Geologic and Hydrologic Setting:
LOCATION: Longitude 90 26′ 45″; latitude 38 46′ 15″, St. Charles
Private wells located near the landfill may nlso ho susceptible to
Uranium is reported to cause adverse health effects in two ways: toxic
chemical effects including damage to the kidney and liver, pneumoconiosis,
pronounced changes in the blood ?nd generalized injury; and radiation
effects including lung cancer, o^teosarcoma, and lymphoma.
Analysis of the rates of fetal :;iat.h, low birth weight, and malformations
for 1972-1982 showed no rate for the area significantly higher than the
An exposure assessment including a well survey, water sampling, and an
administrative exposure questionnaire was completed for the site. This
investigation by the Missouri Department of Health has found there are
only four wells still in use in the area that are downgradient from the
site. One is used only occasionally and one is not used for potable water
at all. None of the residents questioned appeared to have any adverse
health effects caused by materials disposed of fit the site.
Based on available information, a health threat exists due to the effects
of low level uranium wastes buried at the site, and the possibility that
off-site migration of these materials might occur. While there is no
evidence of past or present exposure, the potential for future exposure
exists based on the possibility that off-site migration might occur.
Sampling and corrective containment and diversion should continue at this
site until risk to the public health can more accurately be determined.