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(1) Site evaluation. The site evaluation report shall include the following: <br /> a. Soil borings. At least three soil borings shall be completed for each new <br /> drainfield site designed. Each soil boring must be located within the drainfield <br /> site or within close proximity along similar contours such that similar soil <br /> conditions are likely.For additions to an ISTS, at least one soil boring shall be <br /> made in the expansion area. <br /> b. Percolation tests. At least two percolation tests shall be completed for each new <br /> drainfield site designed. Each percolation test must be located within the <br /> drainfield site or within close proximity along similar contours such that similar <br /> soil conditions are likely.For additions to existing ISTS's,at least one <br /> percolation test shall be completed in the expansion area. <br /> c. Plot plan. A scale drawing of the entire lot showing the following: <br /> 1. All property lines and lot dimensions. <br /> 2. All existing and proposed structures. <br /> 3. All existing or proposed well locations,or water supply piping. <br /> 4. Relative elevations of house,lot corners and drainfield areas. <br /> 5. Slope of ground at drainfield sites by contour lines or direction arrows <br /> and slope percentages. <br /> 6. Location of all percolation test holes and soil borings with identifying <br /> symbols and relative ground elevations of each. <br /> 7. Primary and alternate drainfield areas identified. <br /> 8. Distance from primary and alternate drainfield areas to property lines, <br /> well locations, and any lake, stream,marsh or drainage channel within 75 <br /> feet of any part of the system. <br /> (2) ISTS design. ISTS design specifications shall include proposed flows or other sizing <br /> information,minimum sewage tank capacity,minimum soil treatment area requirements, <br /> a plan of the component layout, and all other information necessary to assure the city that <br /> the ISTS is designed and will be constructed to receive,treat and dispose of all of the <br /> sewage from the building served.Footing or roof drainage,water softener recharge water, <br /> garage floor drainage,toxic chemicals, flammable liquids, animal wastes,commercial <br /> process water and commercial kitchen grease shall not enter any portion of the ISTS but <br /> shall be separately treated and disposed of according to the applicable regulations of the <br /> MPCA,the state board of health and the city. <br /> Page 7 of 18 <br />