OAR 333-061-0032
Treatment Requirements and Performance Standards for Surface Water, Groundwater Under Direct Influence of Surface Water, and Groundwater
(B)
Aquifer characteristics: thickness of the vadose zone, hydraulic conductivity (meaning the capacity of the medium, for example, soil, aquifer, or any hydrogeological unit of interest, to transmit water) of the vadose zone and the aquifer, presence of low permeability zones in the vadose zone, degree of connection between the aquifer and surface water;(i)
Identification of an area of influence, outside of which the likelihood of Cryptosporidium or fecal contamination affecting the treatment plant intake, being the works or structures at the head of a conduit through which water is diverted from a source, such as a river or lake, into a treatment plant, is not significant. This is the area to be evaluated in future watershed surveys under subparagraph (13)(a)(E)(ii) of this rule;
Source:
Rule 333-061-0032 — Treatment Requirements and Performance Standards for Surface Water, Groundwater Under Direct Influence of Surface Water, and Groundwater, https://secure.sos.state.or.us/oard/view.action?ruleNumber=333-061-0032
.