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Line 23: − ===Background Evaluation=== − [[File:Infiltration_Testing_2.jpeg|thumb|Coring holes for infiltration testing]] − Prior to performing testing and developing a detailed site plan, existing site conditions should be inventoried and mapped including, but not limited to: − *Surficial geology and underlying stratigraphy; − *Watercourses (perennial and intermittent), water bodies, wetlands and floodplains; − *Small headwater drainage features; − *Topography, slope, and drainage patterns; − *Existing land cover and land use; − *Natural heritage conservation areas; and − *Other man-made features or conditions that may impact design such as existing nearby structures (buildings, infrastructure, etc.). − − A sketch plan or preliminary layout plan for the proposed development should be evaluated, including: − − *The preliminary grading plan and areas of cut and fill; − *The location and water surface elevation of all existing, and location of proposed water supply sources and wells; − *The location of all existing and proposed on-site wastewater (septic) systems; − *The location of other features of note such as utility rights-of-way, water and sewer lines, etc.; − *Existing data from borehole, well and geophysical testing; and − *Proposed location of development features (buildings, roads, utilities, etc.).
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[[File:Infiltration_Testing_1.jpeg|thumb|Infiltration testing with a Guelph Permeameter at a site in Glen Williams, Ontario]]
'''Soil classification by texture, and then calculating permeability is not an acceptable alternative to measuring infiltration rate in the field.'''
'''Soil classification by texture, and then calculating permeability is not an acceptable alternative to measuring infiltration rate in the field.'''
*Consideration of desired BMP [[drawdown time]].
*Consideration of desired BMP [[drawdown time]].
===Test Pit or Soil Boring Observations===
===Test Pit or Soil Boring Observations===