Typically people will not spend more than two hours at a small cemetery. However, if larger cemeteries have caretakers or other workers, acute risks should be evaluated (in addition to worker exposure).
Farmland may be considered an acute exposure, unless there is worker exposure that occurs for longer than an acute exposure. For instance, there are some farming practices that require workers to remain in a single field for a full workday, for a full season. Another example is a livestock area that requires workers to be present every day. In these cases, a worker exposure scenario would be more appropriate than a farm in which a worker may only be present a few hours a day for a few days a year. A residence on farmland must be evaluated for residential exposure. Please consult with DEQ with specific questions.
Areas zoned residential but no houses are built
The default option for any area zoned for residential use is to evaluate residential exposure. Residential risk represents the most conservative risk estimates due to the frequency and length of exposure. A facility may request to reclassify the residential zone to another exposure type such as worker or acute if there is no current residential land use in that area- see section “What if the land near my facility is not currently being used in a manner consistent with zoning map" below.
A large nature reserve
A large nature reserve that allows public access should be evaluated for acute exposure.
Parks should be evaluated for acute exposure as it is reasonable to assume that people will normally congregate for extended periods of time.
Jails and Prisons
Both jails and prisons should be evaluated for worker exposure. Given the more limited exposure duration in jails, residential exposure does not need to be evaluated. Prisons with inmates present for one year or more should also be evaluated for residential exposure.
Future Urban Development
Areas Zoned “Future Urban Development" are defined as “holding zones inside Metro UGB - planned for future residential or nonresidential uses." The most conservative exposure location assignment for these types would be residential. DEQ recommends working with local land use authorities to determine if an urban development plan is in place that would better categorize the future land use. If this area will not be evaluated for residential risk, the facility may be required to provide annual documentation that the area has not had homes built or in development. If the facility evaluated this as a residential exposure, annual documentation would not be required.