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inlet. <br />4. Drainfields. <br />(a) Trenches. Trenches must meet MPCA Regula tions Minnesota Rules <br />Chapter 7080 and may not be located on slopes greater than 18%. withou t varian ce. <br />(b) Mounds andAt-Grades . Mounds and at-erades must meet specifications <br />per MPCA Regulations Minnesota Rules Chapter 7080 and may not be located on soils with <br />percolation rates slower than 120 mpi. n or on slope s greater than 6% without varian ce. Mounds or <br />ar-grades mav be placed on slopes up to 12% with soils having a percolation rate of 0.1-30 mpi and <br />a soil texture of sand, fine sand, sandv loam, or loam. Mounds or at-grades mav be placed on slopes <br />up to 9% with soils having a percolation rate of 31-45 mpi and a soil texture of loam or silt loam. <br />Mounds or at-grades mav be placed on slopes up to 6% with soils having a percolation rate of 46- <br />120 mpi and a soil texture of clav loam or clav. <br />C. Compliance Standards <br />1 . New systems shall be located, designed and constructed as code systems. <br />2. When an existing code .«>stem is repaired or expanded, such system shall <br />remain a code system. Compliant systems, when repaired shall be upgraded to a code system status <br />whenever such classification is reasonably attainable. <br />3. Existing non-compliant systems shall be replaced by code systems <br />whenever such classification is reasonably attainable. If a code system is not achievable due to soil, <br />water table, or lot limitations, the system may be replaced or repaired such that it becomes a <br />compliant system. <br />D. Construction Procedures. <br />1. Protect Ab sorpt ion Drair-fft^te Proposed drainfield absorption areas <br />shall be identified and marked off on the lot at the uitvv ot ;he site evaluation and prior to any <br />construction or grading occurring in the area. The drainfield area shall remain undisturbed until <br />drainfield construction is commenced. No vehicular traffic shall be allowed in the drainfield area <br />either before or after drainfield installation. <br />2. Favorable Weather Required: Drainfield absorpt ion area or trench <br />construction must not proceed if the area is wet or has had rain within 48 hours. Mound or trench <br />construction shall not proceed unless the soil moisture content is below the plastic limit. <br />3. Construction Inspection Required: The contractor issued a permit for on- <br />Page 14 of 22