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Section 403. The Agency intends to promulgate regulations under <br /> Section 403 setting health-based standards for lead in soil and <br /> dust. OSWER intends to issue a final soil lead directive once <br /> the TSCA Section 403 regulations are finalized. For additional <br /> information on TSCA Section 403 developments, call (202) <br /> i <br /> 260-1866. <br /> However, the Agency believes that risk managers (risk <br /> assessors, on-scene coordinators, remedial project managers, and <br /> other decision-makers at Superfund and RCRA sites) are currently <br /> in need of the best guidance available today. The Agency <br /> believes that the IEUBK model is the best available tool <br /> currently available for assessing blood lead levels in children. <br /> Furthermore, use of the IEUBK provides allows the risk manager to <br /> consider site-specific information that can be very important in <br /> evaluating remediation options. Therefore, using the latest <br /> developments in the IEUBK model and the collective experience of <br /> the Superfund, RCRA Corrective Action, and TSCA Section 403 <br /> programs, the Agency is offering this guidance and is <br /> recommending a residential screening level for Superfund and RCRA <br /> sites of 400 ppm. <br /> BACKGROUND <br /> Early OSWER guidance (1989-1991) . Four guidance documents on <br /> soil lead cleanup were issued by OSWER during the period of 1989 <br /> to 1991: <br /> September 1989, OSWER Directive #9355.4-02 . This <br /> guidance recommended a soil lead cleanup level of 500 - <br /> 1000 ppm for protection of human health at residential <br /> CERCLA sites. <br /> 2 . May 9, 1990. RCRA Corrective Action program guidance <br /> on soil lead cleanup. This guidance described three <br /> alternative methods for setting "cleanup levels" (not <br /> action levels) for lead in soil at RCRA facilities. <br /> One approach was to use levels derived from preliminary <br /> results of IEUBK morel runs. The other two approaches <br /> were to use the range of 500 to 1000 provided in the <br /> 1989 directive on CERCLA sites, or to use "background" <br /> levels at the facility in question. <br /> June 1990, OSWER Directive #9355.4-02A. Supplement to <br /> Interim Guidance on Establishing Soil. Lead Cleanup <br /> Levels at Superfund Sites. This memorandum reiterated <br /> that the September 1989 directive was guidance and <br /> should not be interpreted as regulation. <br /> 4 . August 29, 1991. This supplemental guidance discussed <br /> EPA's efforts to develop a new directive that would <br /> -5- <br />