API Publ 4721:2002 pdf download.Analytical Detection and Quantification Limits: Survey of State and Federal Approaches
The American Petroleum Institute (API) conducted a review of state policies related to analytical detection and quantification limits, with particular focus on water quality and wastewater issues in permitting and compliance. Ten states were reviewed: Alabama, California, Illinois, Louisiana, New Jersey, Ohio, Oklahoma, Pennsylvania, Texas, and Washington. Summary findings of this review are: § Every state incorporates detection or quantification terms in its regulations. Terms referenced in regulations are usually defined in the regulations, but not always. The most frequently used terms are detection limit/level, method detection limit (MDL), and practical quantitation level (PQL). Minimum level (ML) is used by Alabama, California, Illinois, and Ohio.` § The states vary in the extent to which detection and quantification terms are incorporated into their regulatory language. Some states prefer to have the most detailed policies in their water quality implementation procedures; other states prefer to put the detail directly in the regulations. § The states will set wastewater permit limits at or below detection or quantification levels, where considered protective of water quality. Most states specify, either in their regulations or implementation procedures, how compliance is demonstrated in such cases. Compliance with a maximum concentration limit is demonstrated by a Òless-thanÓ analytical result (a detection or quantification limit, as applicable). Where a mass load or average concentration is calculated, most states specify that zero be used in lieu of less-than values. In some situations, one-half the detection limit must be used.§ Although the states have procedures for allowing wastewater permittees to develop site-specific detection or quantification limits based on state- or EPA- defined methods, none of the states had specific procedures for developing or approving alternative methods. State staff indicated that approval of alternative methods would be on a case-by-case basis, and likely coordinated with the USEPA. § Permittees can ensure that they obtain permit limits that do not cause compliance monitoring problems related to detection and quantification issues. During the permitting process, permittees should pay particular attention to effluent data in the application, the need for site-specific detection and quantification limits or procedures, and permit requirements specifying how compliance is to be demonstrated.
API Publ 4721:2002 pdf download
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