Agenda - 11-25-1985 - Laserfiche WebLink

Browse Search

r t 000707 2 facility, the average rainfall is an inadequate measure because utilization of the average will render the design of the land treatment facility inadequate approximately 50% of the time. The rainfall used to calculate the water balance was 60.45 inches per year. This is the rainfall based on a 10-year return period and accounts for the variation in rainfall in the area. The rainfall data is included in the hydraulic budget which is addressed later in this report. Topography The proposed land treatment site is located in an area which is typical of the piedmont physiogeogkaphic province of the state. The site selected for investigation was gently rolling. The maximum slope encountered on the proposed wastewater receiver site appeared to be >5%.. A detailed topographic map of the site should be provided prior to the actual design of the waste application system. Wastewater receiver sites can easily have slopes of as much as 15%. Since the maximum slope encountered on the proposed wastewater receiver site for the Bradshaw Mobile Home Park- appears to be >5, slope or topography should pose little limitation to the design or operation of a slow rate spray irrigation system. Geology The geologic map of North Carolina indicates that the proposed waste receiver site borders an area called the Triassic Basin. The soils in the area are characteristically upland Piedmont soils formed from decomposition of metavolcanic rocks such as slates. There may be some remnants of Triassic Basin and slate belt soils in the area; however, the predominant soil material is derived from slates. The underlying geologic material is important since it determines the soil which forms on the land surface. Further, geologic material is important because excessive fracturing can lead to some contamination of groundwater. The slates generally form