Stringfellow Acid Pits, Superfund site in Glen Avon, United States.
The Stringfellow Acid Pits are a former limestone quarry at the base of the Jurupa Mountains transformed into a contaminated industrial waste disposal site. The area contains multiple deteriorated evaporation ponds where hazardous liquids were once dumped for years.
The site operated as an industrial waste disposal facility from 1956 to 1972, resulting in widespread groundwater contamination beneath Riverside County. Its designation as a Superfund cleanup site came years later when the extent of environmental damage became clear.
Environmental activist Penny Newman led local community efforts that contributed to the site's designation under the national Superfund program for hazardous cleanup.
Public access to the site may be limited or restricted due to ongoing remediation work and hazardous contamination. Visitors should verify current access conditions and safety requirements before planning a visit.
One distinctive aspect is that certain hazardous chemicals at the site may persist in the soil and groundwater far longer than typical contamination. The extremely lengthy cleanup timeline demonstrates how some industrial pollutants resist conventional treatment methods.
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