Site remediation, regulatory approach

Regulatory Approach to Site Remediation. Most environmental cleanup standards are derived from the provisions of CERCLA, section 121 "Cleanup Standards" or RCRA, Subtitle C entitled "Hazardous Waste Management." The implementing regulations are... 

Selection of approach or combination of approaches to LNAPL recovery and ultimately aquifer rehabilitation and restoration is dependent on numerous factors as discussed in the previous chapters. The case histories presented below reflect different remediation approaches and strategies in response to varying geologic and hydrogeologic conditions, site-specific constraints, and regulatory environment. A variety of LNAPL recovery systems are first discussed, including ... 

In addition to potential metal toxicity, sites with multiple contaminants have difficulty meeting regulatory cleanup levels within acceptable time frames. It is important to note that at these highly contaminated sites, one remedial approach will not be able to address all of the contaminants and media. The key will be to employ remedial treatments that can be easily adapted as a part of the treatment train. 

URS/Radian proposed the use of phytoremediation to treat groundwater contaminated with dissolved phase CHC at a chemical plant. The State of Louisiana regulatory agency recommended standard piunp treat technology. However, Radian was able to convince the State to use a new more cost effective remedy. Hybrid Poplar trees were planted to achieve hydraulic containment and phytoextraction of the entire dissolved plume. The shallow groundwater and long growing seasons were ideal for this remedial approach. Radian was eventually able to close the site and obtain a no fiuther action letter from the State of Louisiana. 

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