United States reporting thresholds

Poly(vinyl chloride) is Hsted on the TSCA inventory and the Canadian Domestic Substances List (DSL) as ethene, chloro-, homopolymer [9002-86-2]. Because polymers do not appear on the European Community Commercial Chemical Substances listing or EINECS, poly(vinyl chloride) is listed through its monomer, vinyl chloride [75-01-4]. In the United States, poly(vinyl chloride) is an EPA hazardous air pollutant under the Clean Air Act Section 112 (40 CER 61) and is covered under the New Jersey Community Right-to-Know Survey N.J. Environmental Hazardous Substances (EHS) List as "chloroethylene, polymer" with a reporting threshold of 225 kg (500 lb). 

Ozone and sulfur dioxide mixtures are of special interest, because of their widespread occurrence and the greater than additive effect on Bel W, tobacco. Concentrations of either or both that may cause foliar injury are found around major metropolitan areas throughout the world and are widespread throughout rural eastern United States. Macdowall and Cole reported that the two-gas combination lowered the threshold for injury of tobacco (cultivar White Gold) by sulfur dioxide, but not the threshold for ozone injury. Macdowall et defined the threshold in terms of dose when th reported the threshold at 20 pphm-h (0.20 ppm-h). This has not appeared true in several other reports, nor within the results reported by Macdowall and Cole. Symptoms reported, when sulfur dioxide was below the threshold for the specific plant, were similar to those reported for ozone. 

First of all, the CERCLA requires all hazardous waste releases over a prescribed threshold, known as reportable quantities (RQs), to be reported to National Response Center. Action is taken from that point to determine if it will be a CERCLA site. The CERCLA also established development of a National Contingency Plan. This plan includes all procedures for handling hazardous waste in the United States. The act also requires the creation of an uncontrolled hazardous waste site ranking system (HRS). The HRS determines if a site should be placed on the National Priorities List (NPL), which is a list of all the Superfund sites. 

A threefold difference in threshold concentrations is reported for long-term exposure to copper (adjusted to 50 mg/L CaC03 hardness) derived from 1 lentic mesocosm and 6 artificial stream studies conducted in the United States and Europe (Versteeg et al. 1999). The NOECecosystem values of these studies with copper were in the range of 2.1 to 6.6 pg/L. 

Captafol is a general use pesticide with a toxicity classification of IV (relatively nontoxic). It is classified a as restricted use pesticide in the United States. It is no longer sold in the United States. The Occupational Safety and Health Administration threshold limit value for captafol is reported to be 0.1 mgm . ... 

Once all what-if analysis questions have been asked and answered along with all completed HAZOP studies of system components, a final report should be written to document all findings and recommendations. In the chemical industry (in the United States), this report is normally referred to as a process hazard analysis. This report is required under both OSHA and EPA regulations for facilities that handle or contain certain chemical commodities at certain defined quantity thresholds. However, when HAZOP studies and what-if analyses are used in general industry application, documentation of the results can be included in a written report along with any other system safety analyses that may have been performed (as described in previous chapters). If the HAZOP and what-if exercises were conducted as standalone analyses, then a final written report should be... 

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