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Thomas E. Wohlleber <br /> July 22, 1992 <br /> Page 3 <br /> The properties observed in the profile of TP5 typify those existing within the <br /> zone of well drained soils. The surface horizon is a plow layer and consists <br /> of silt loam to a depth of 11 inches. The silty clay loam subsoil occurs <br /> between 11 inches and 20 inches and is underlain by a horizon of sandy loam to <br /> a depth of 70 inches. A sand and gravel substratum exists to a depth of <br /> greater than 89 inches. Structure of all horizons is well defined. Also, <br /> textural and structural changes between horizons generally are not abrupt <br /> which provides for more effective drainage. <br /> Soil properties observed in the profile of TP4 are typical of soil within the <br /> moderately well drained zone. The surface horizon consists of 12 inches of <br /> very fine sandy loam. The subsoil extends to a depth of 59 inches and has a <br /> texture of silt loam to silt clay loam. A sandy loam horizon lies below to a <br /> depth of 76 inches followed by sand and gravel to a depth of greater than 103 <br /> inches. Structure of the profile is well defined to a depth of 34 inches <br /> below which it becomes weak. Soil mottling, localized zones of color <br /> differing from that of the soil matrix, were observed between depths of 22 <br /> inches and 59 inches. These mottles were orange to red-orange in color and <br /> were formed under unsaturated conditions after extended periods of saturation. <br /> Conclusions and Recommendations <br /> Based on the observed soil conditions, use of the site for subsurface <br /> wastewater infiltration should be possible. The type of system required will <br /> be dependent on location of the infiltration portion of the system. <br /> Conventional subsurface infiltration trenches installed in native soil would <br /> be suitable for the well drained zone indicated on the attached site plan. <br /> System size will be determined using a hydraulic loading rate of 0.4 to 0.5 <br /> gallons of wastewater per day per square foot (gpd/ft2) of infiltrative <br /> surface bottom area. Use of the moderately well drained zone will necessitate <br /> arptrdlr.wp <br /> 4153.00 <br />