Clean closure of former hazardous waste impoundments using statistical analysis of constituent concentrations in associated media
- AWD Technologies, Inc., Bellevue, WA (United States)
- AWD Technologies, Inc., San Francisco, CA (United States)
- Dow Chemical Co., Pittsburg, CA (United States)
In 1988--89, six former hazardous waste impoundments at a chemical manufacturing plant in California were remediated by stabilization and excavation of waste. Affected soil and wastes were consolidated beneath a RCRA cap constructed over four of the impoundments. Verification samples for clean closure were collected beneath the two remaining excavated impoundments for clean closure and results were submitted to the California EPA`s Department of Toxic Substances Control (DTSC). DTSC noted high concentrations of arsenic and chromium in the verification samples and requested the installation of a RCRA cap over the two remaining excavated impoundments, concluding that the levels of arsenic and chromium were above acceptable levels from their health based risk assessment. In late 1993, AWD Technologies (AWM) prepared a submittal to DTSC which re-evaluated the verification data for clean closure of the two remaining excavated impoundments. A standard statistical technique was used to determine the upper and lower confidence limits for arsenic and chromium, the constituents of concern. Evaluation of groundwater data from wells in the vicinity also indicated that groundwater had not been affected by either arsenic or chromium. AWD`s evaluation concluded that no reduction in risk would be expected if a cap were constructed over the impoundments.
- OSTI ID:
- 69829
- Report Number(s):
- CONF-941189-; ISBN 1-56590-016-2; TRN: IM9529%%217
- Resource Relation:
- Conference: SUPERFUND XV: 15th environmental conference and exhibition for the hazardous materials/hazardous waste management industry, Washington, DC (United States), 29 Nov - 1 Dec 1994; Other Information: PBD: 1994; Related Information: Is Part Of Superfund XV conference proceedings. Volume 2; PB: 877 p.
- Country of Publication:
- United States
- Language:
- English
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