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Soil lines were not put on the plot because no contour lines are given. The predominate soil on the site as taken from the Hennepin Soil Survey is indicated as Hayden clay loam and may be used for preliminary evaluation of the site potential. An on - site determination of the suitability of the soil in the desig- nated area of the Proposed drainfield on each lot must be the final determinate. The first item of concern to all parties involved :s the loca- tion of the potential waste treatment sites on the lot. Poten- tial waste treatment sites and house location should be desig- nated before any actual on -site testing is done. The indiscrim- inant placement of borings and percolation tests should be avoided. Likely areas that should be considered for placement of waste treatment systems include the crests of knolls and hills as well as slightly sloping portions of hills. Landscape locations which should be avoided are depressions and drainage swales that collect runoff from the surrounding area. The proposed house site should be stakes; and potential waste treat- ment sites should be evaluated with the natural topography in mind to provide gravity flow to the system if possible. The tests required to determine site suitability should be conducted on the first choice area of the proposed system. If test results are negative additional potential areas that have been indicated :na� he investigated. After soil testing is completed the site for the waste treatment system should be conspicuously staked. This area should be protected from au disturbance during other construction act ivities. Percolation tests and soil borings are conducted to determine site suitabilit}-, system size and system type. The following informa- tion needs to be obtained from the tests and borings. All soil borings and percolation tests should be conducted within the area of the proposed tia5te treatment system. Percolation tests should be conducted at the proposed depth of the bottom o the .-epage trenches. These tests should not be conducted in the ►exture. This will insure that the percolation tests are conducted at the depth of the seepage trenches. At least 3 percolation tests should be conducted following the standards for percolation tests in WPC-40 the standards adopted by the Minnesota Pollution Control AgencN-. Soil borings provide information on the soil texture and deptl. to a watertable to be used in determining system size and type. The borings should be conducted to a depth of at least 4 feet greater than the bottom of the seepage trenches. Soil texture which is an expression of the inter -relationship between the three grouping., of particle size: Sand, silt an,l clay; should he identified for each 1 foot depth.