11-07-1977 Planning Packet - Laserfiche WebLink

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Individual snt of Health area vtfiere und level ^ears to re alty. Ihe lal Sewage ' trenches •r bedrock" other than nt. n the mound and fill to the !;eepage Treatment distance ater than fact that D properly nt reaches in the pres iiqxits of ng of the e. This ere e a health g^ht of a >in County ailoration westigation include a 1 this back- ^eloiment area npanying soils lie soils i unsuitable rage *i.urmm-mm )r:.. ■ ■7* ' ‘ r The Glencoe and Hamel soils indicated by the medium blue color on the soils overlay have the highest vratertable during the year eithei* at or^ within 1 foot of the s»jrface. This water may persist for several months during the year. Installation of any subsurface soil absorption system in this soil obviously would not allow the minimum recommended separation The mound system is designed for soils with periodic high watertables. However, the watertable must not be higher than 2 feet below the surface for the mound system to function effectively. Installation of any soil absorption system on this soil type is not reconmended. Areas of Dundas and Minnetonka soils are indicated by the light blue color on the soils overlay. The maximum height of the seasonal watertable in this soil as indicated by the presence of mottles is usually between 1 and 3 feet. If the mottling occurs at less than a 2 foot depth installation of any soil absorption system is not reconmended. If the mottling occurs at a depth greater than z ^a mound system may function properly. Nessel soils colored light green on the soils overlay commonly have a seasonal watertable at a depth of 3 to 5 feet. If the soil mottling in dicates that the depth of the watertable is 3 feet the recommended separ ation between the bottom of the seepage trench and the watertable ca^t be maintained. In this case, installation of any subsurface system is not recommended. However, a mound system can function properly. If the mottling indicates the watertable present at the 5 foot depth then a shallow trench system could provide adequate treatment. The Hayden soil, colored medium green on the accompanying overlay offers the most potential for waste treatment. Presence of the seasonal water- table is often below the 5 foot depth. This ^Id allow the installation of the standard subsurface system. However, in many cases there is evidence of soil mottling at a 4 to 5 foot depth. This fact, coupled with the presence of the most premeable portions of this soil nearer the surface, means that a shallow trench system will probably function better than the standard system on this soil. Shorewood soils, colored light red on the soils overlay, coinnonly have a seasonal watertable at a depth of 3 to 5 feet. In addition, percolation rates on these soils are often in excess of 60 minutes per inch . For this reason an innovative mound system will function more effectively than either a standard system or a shallow subsurface system. Erin soils indicated by the medium red color on the soils overlay have a high clay content in the subsoil. This often results in percolation rates in excess of 60 minutes per inch. For this reason it is recommended that an innovative mound system be installed on these soils. These systems cannot be installed on slopes greater than 6 percent. This may represent a serious problem for the site plan as presently drafted. il m mm At til treat] to pr water Use o for s sure ^ste inclu turbe prese fiitur word ' has b quest The a of an basis shoul< for t fille settl idiich load! suffi For a tion taine eabil the s of th tance is hi Based rearr lots muck syste Hayde V. PUBLI There areas At th