Agenda - Planning Commission - 02/04/2016

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C. Tank placement on slope Placement of a tank in the upper or downside toe of a nearby slope can and should also be considered before installation of a tank (next to a building footing or foundation). Again, soil coverage for frost protection is a big item to consider in this situation as is added loading and/or moving or removing soils for required bearing capacity and frost protection of the building. D. Tank weight and/or pressures Tank weight and/or pressures from the installation of a tank when placed in close proximity to a buildings footing/foundation system (even the excavation work itself) must also be considered. Either condition could affect the building footing/foundation system design. E. Insulation In some instances, for some frost -free footing/foundation or building slab designs, the building code will require extensions of certain soil types or even foundation insulation that can/may project out and away from a buildings' foundation system to protect the footing/foundation from potential movement due to frost. For some designs, you could have certain soils and/or rigid insulation extending out and away from a building upwards of four to six feet away from the foundation. Tanks or other elements that are placed in this area could affect those required building designs. F. Deck or porch type pier (isolated) footings For deck or porch type pier (isolated) footings, differential movement/settlement of the nearby soils could have major impacts when tanks or other buried elements are placed too close to the footing/foundation. Detrimental disturbances or affects always need to be considered. G. Drainage Proper footing/foundation drainage must also be considered. Most building footings/foundations have exterior drainage systems up against the foundation wall or down by the footing for removal of hydraulic loading in the soils. Excavations should be located so they do not affect required building foundation drainage at the surface and/or below ground near the required subsurface drainage system. H. Other It should be understood that the building code does not address possible damage to the building foundations from an existing sewage tank that is leaking. Also, the potential loading conditions of a pump truck driving in or near a buildings' footing or foundation system must be considered. If there is any question about the relationship between the building foundation and the SSTS tank, consultation must be sought from the Building Official/Building Designer/other authority having jurisdiction. 3. Damage to the SSTS from construction of the BSLI. There is a concern about damage to the SSTS during construction of the BSLI. This can include driving over and crushing or compacting the soil dispersal system's components and driving over and cracking a sewage tank. If a concern, a restriction could be imposed, such as fencing the SSTS to restrict construction equipment. 4. Hindrances from the location, operation or use of the BSLI in the operation and maintenance of the SSTS. This issue can manifest itself in many ways. A short list is provided below: • Change in surface drainage of precipitation and spring meltwater with the addition of new BSLI. Examples include run on drainage from roofs (without gutters) or parking lots sloped toward the SSTS. • The new BSLI blocks the route needed to pump the tanks. • The new BSLI restricts SSTS construction equipment to repair or replace the SSTS. • The new BSLI hinders or prohibits access to maintenance hole covers. Some of these issues may be best alleviated by requiring a setback; other may be adequately handled by a restriction or guidance. Subsurface Sewage Treatment Systems and Building, • wq-wwists4-47 • August 2011 Minnesota pollution Structures and Lot Improvement Page 3 of 4 reVeirol Agancy