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141 <br /> • �M. DENNIS).OSBORNE&ASSOCIATES <br /> IIII�I ELMWOOD,16 BOYLAN AVE.,RALEIGH,NC 27603 <br /> Phone 919-821-5074 <br /> Introduction <br /> The purpose of this report is to summarize properties of in a low pressure effluent treatment system will be constructed. Thisssummarich <br /> is provided at the request of the Orange County Plannin De <br /> This summary is not intended to re g partment Staff.y <br /> and site investigation report as <br /> to be used as the detailed soil <br /> This summary is only intended to cam 1 Part of the DEM submittal package. <br /> site work has been accomplished. P Y with Planning Staff request to insure <br /> Summary <br /> Soils on the area of the Piney Mountain low <br /> ranging from 2 to 12 percent. These soils occur onrans upland eridgeCrestnandopes <br /> sideslope. These geomorphic features developed from slates influenced <br /> intrusions. Influence of the instrusions is limited to areas not included nd <br /> in the system underla by basic <br /> in the system yment. The system is located specifically on the soils(by virtue of chemical and hydraulic factors) to waste treatment. <br /> Since waste treatment, not waste disposal, is the design basis of a low the properties affecting waste treatment are those analyzed when selecting stem. oe pressure <br /> from <br /> Soils exhibit an A-horizon <br /> (commonly called topsoil) ranging <br /> called subsoil) range from 24 to 29 inches ethicky loam. The B-horizons <br /> colloidal fraction range <br /> dominated by (commonly <br /> capacity ranges from 12 to dominated <br /> mibyiequivr non-shrink swell clays. Cation whose <br /> c p obey ranges <br /> in per 100 Y Cighes exchange <br /> Y the maximally developed portion of the gargillicthorizon. <br /> The pH of the soils is below 5.0 in all horizons. <br /> from 35 to 51 percent between 30 and 80 centimeters depth. <br /> A-horizons is low and increases with depth to a maximum Clay content ranges <br /> Organic carbon is low as is usual, highest in the surface Clay content of <br /> Organic <br /> Permeability ranges from 0.6 surface at about 60 centimeters. <br /> blocky in./hr. , as expected <br /> about t 0.1 to y sPer eube and ranges <br /> clays. to 1.6 in. <br /> in./in_ Design loading rate is 0.1 water capacity is about 0.1 to 0.2 <br /> than n. Design <br /> in loading gesatech 1 gal./ft• /da <br /> publication of Note is <br /> such a low rate is utilized is because: <br /> efficacy of such; (2) analytic data suggest(1) experience indicates, hydraulic <br /> and animal contaminants have repeatedlbeentshownato be and <br /> in unsaturated omi flow have ycreated in shown to (3) d both chemical <br /> removed from ate effluent <br /> those soils at this rate. <br /> wiluui Site Development Analysis Soil Interpretation Soil Surveys <br />