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or at-grades may be placed on slopes up to 9% with soils having a percolation rate of 31-45 mpi and <br />a soil texture of loam or silt loam. Mounds or at-grades may be placed on slopes up to 6% with soils <br />having a percolation rate of46-120 mpi and a soil texture of clay loam or clay. <br />C, Compliance Standards <br />1. New system shall be located, designed and constructed as code system. <br />2. When an existing code system is repaired or expanded, such ISTS 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 ISTS may be replaced or repaired such that it becomes a compliant <br />system. <br />D. Construction Procedures. <br />1. Protect Drainfield Area: Proposed drainfield areas shall be identified and <br />marked off on the lot at the time of the site evaluation and prior to any construction or grading <br />occurring in the area. The drainfield area shall remain undisturbed until drainfield construction is <br />commenced. No vehicular traffic shall be allowed in the drainfield area either before or after <br />drainfield installation. <br />2. Favorable Weather Required: Drainfield area or trench construction must <br />not proceed if the area is wet or has had rain within 48 hours. Mound or trench construction shall not <br />proceed unless the soil moisture content is below the plastic limit. <br />3. Construction Inspection Required: The contractor issued a permit for <br />ISTS construction shall perform all work according to the design specifications approved by the City <br />for each particular ISTS. All subsurface work including building sewer, sewage tanks, distribution <br />system and soil-treatment area shall be inspected by the City Inspector prior to backfilling or <br />covering of any portion thereof It shall be the responsibility of the contractor to notify the City at <br />least 24 hours prior to the time an inspection will be required, and it shall be the responsibility of the <br />contractor to ensure that the inspection is accomplished and the construction is approved prior to <br />any backfilling, covering or continuation of the construction. <br />Subd. 6 System Operation, Use and Maintenance. <br />A. Existing systems require prudent use and proper maintenance to ensure <br />Page 10 of 16