Subsurface disposal of domestic septic effluent in a haploxeralf soil in Southwestern Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/sx61dq544

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  • Experimental Drainfields: Standard subsurface sewage disposal systems, gravity loaded and 60 cm deep on slopes above 15% did not show signs of effluent surfacing after 14 months of operation. However, subsurface signs of failure were found on both the experimental sites and on older drainfields established in identical soils. Evidence included fecal coliforms in the groundwater nearby, ferrous compounds in trenches, and trench ponding. Lateral movement of coliforms over an undisturbed restrictive layer under high-intensity short duration rainfall does occur. Penetration of fractured rock by drainfields may result in coliform contamination some distance from the site. Low pressure dosing of drainfield trenches appeared to prevent ferrous compound buildup. Curtain drains installed in fractured rock do not function as effectively as ones installed in a soil restrictive layer and may not be effective for a standard size field on steeper slopes. Effluent volume monitoring indicated that figures currently used by Oregon's Department of Environmental Quality to size drainfields may need revision. Piezometers: Six different soils were evaluated on the basis of their suitability for drainfields. Water table fluctuation was monitored for three years. Permeability, as determined by structural strength, porosity and slope were determining factors in a soil's ability to transmit water rapidly. The position of the long term high water table could not always be determined by soil mottling. Geomorphic position was equally important in assessment of drainage capability.
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