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"threshold" size indicated on the applicable zone label on the official zoning map (for example, if the applicable zone is "SGO-5" and the average size of lots and parcels in the area is four acres); or (b) The new use will result in consumption of more than 90 percent of the available recharge within one-quarter mile, based on use information generated for the Inventory and recharge data contained in "Geologic and Hydrogeologic Study of the Residential Acreage-Zoned Areas of Marion County Underlain by the Columbia River Basalt and Older Rocks" (NGS, 1997), and assuming one dwelling results in use of 525 gallons/day. (2) If the Water Use Inventory demonstrates that the new use will result in consumption of 70 percent or more, but less than 90 percent, of the available recharge within one-quarter mile, based on use information generated as part of the Inventory and recharge data contained in "Geologic and Hydrogeologic Study of the Residential Acreage Zoned Areas of Marion County Underlain by the Columbia River Basalt and Older Rocks" (NGS, 1997), and assuming one dwelling results in use of 525 gallons/day, the county may apply conditions pursuant to section 181.140 to approval of the proposed use. The water use inventory density is one lot per 12.63 acres within one-quarter mile of the subject property, which is greater than the five acre threshold parcel size in the SGO-5 zone. The inventory also estimated that 13.1 percent of available recharge would be used, which is less than the 90 percent standard in MCZO 181.090(C) (1) (b), and less than the 70 percent standard in MCZO 181.090(C) (2). A hydrogeology review is not required under chapter 181 as part of the partitioning process. The purpose of MCZO chapter 181 is to implement the groundwater resources goals and policies of the environmental quality and natural resources section of the MCCP. Chapter 181 implements the program to review land use applications to assess the risk that a proposed use will adversely affect the sustainability of aquifer production. The ordinance is not intended to act as a guarantee that a property owner will successfully locate an adequate water supply at a particular location or on a specific lot or parcel, or that any individual well will continue to provide adequate water for an existing land use. Chapter 181 attempts to evaluate new exempt uses to determine whether they are likely to contribute to groundwater over use in the area. The levels of review set by chapter 181 meet the MCCP and MCZO requirement to evaluate a use to determine whether there is any significant evidence of an inability to obtain a suitable domestic water~ supply for a use, and to provide sufficient P 02-21 - ORDER -12 KOLOEN