Highlight 8-32, page 263 of the HRS Guidance Manual provides numbers, like 82,500, that are well worth remembering. These numbers are used in all pathways, with one exception: for the soil exposure pathway the minimum value for quantity never rises above 10.
Apply the 50, 45, or 20 and dilution weight sequentially:
- 50, if any intake is subject to level I
- 45, if no Level I, but an intake is subject to
Level II; and
- 20 and dilution weight if no intakes are subject to actual contamination.
Standby intakes may be considered for this factor only if they are used for supply at least once a year. Note the similarity of "nearest well" in the ground water pathway.
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