Staff Decision (1834) - Laserfiche WebLink

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"The proposed land partitions are located in the South Salem Ground Water Limited Area (SSGWLA). The limited area restricts uses from wells in the basalt aquifers. A review of well logs in this section (8S/4W-24C) indicate that the wells for these proposed lots will likely develop ground water from the marine sediments. Well yields in the marine sediments typically are low; less than 10 gallons per minute (GPM). The yields generally decrease with time; down to one to two GPM. Lot sizes must be sufficient to allow for multiple replacement wells. The maps indicate replacement sites for drainfields. There should be areas designated for replacement wells. This is especially important if the land surface has a slope that limits access for equipment. There are areas of landslide deposits in the general vicinity. While marine sediments generally have low yields, well yields could be higher in areas of landslide deposits." Salem/Keizer Public Schools provided information concerning impacts of additional students. Area Advisory Committee #1 stated opposition to the proposal and concern for groundwater availability. All other contacted agencies either failed to comment, or stated on objection to the proposal at the time this report was written. Chapter 181 of the Marion County Zoning Ordinance establishes procedures for partitioning property in a SGO zone. As required in a SGO-5 zone, the applicant submitted a Water Use Inventory with the application materials. The inventory concluded that there is sufficient groundwater to support the proposed development and that the proposed division satisfies applicable density standards. The applicant has satisfied the partition requirements outlined in Chapter 181. Although no additional study is necessary, the County requires a Declaratory Statement be recorded with the property deed. This notifies the applicant, and subsequent owners, that there may be long term groundwater supply problems and that the County is not responsible for deepening or replacing wells. The subject parcel is situated in a designated Geologically Hazardous Area. Chapter 182 of the Marion County Rural Zoning Ordinance establishes procedures to address issues resulting from partitioning property within a geologic hazard area. The applicant provided an Engineering Geology Assessment, prepared by Geotech Engineering and Geology, as part of the application materials. However, the assessment included parcels identified as Parcels 2, 3, & 5, which constituted only three of the proposed five parcels that comprised this partitioning and the proposed adjacent division of tax lot 902. Parcels identified as lot 1 of this partitioning and lot 4 of proposed partitioning P02-21 (tax lot