Changes

==Four Step Process==

==Four Step Process==

*Done prior to field work; and

*Done prior to field work; and

*On-site soil tests may be done to identify/screen potential BMP locations.

*On-site soil tests may be done to identify/screen potential BMP locations.

'''2. Test Pit or Soil Boring Observations'''

'''2. [[Groundwater|Test Pit or Soil Boring Observations]]'''

*Includes multiple testing locations;

*Includes multiple testing locations;

*Provides an understanding of sub-surface conditions; and

*Provides an understanding of sub-surface conditions; and

*Identifies limiting conditions (e.g., aquitard, bedrock or water table elevations).

*Identifies limiting conditions (e.g., aquitard, bedrock or water table elevations).

'''3. Infiltration Testing'''

'''3. [[Infiltration|Infiltration Testing]]'''

*Must be conducted on-site;

*Must be conducted on-site;

*Various testing methods are available; and

*Various testing methods are available; and

*Different testing methods for screening versus verification purposes.

*Different testing methods for screening versus verification purposes.

'''4. Design Considerations'''

'''4. [[Design infiltration rate|Design Considerations]]'''

*Determination of a  suitable [[Design infiltration rate| infiltration rate for design calculations]]; and

*Determination of a  suitable [[Design infiltration rate| infiltration rate for design calculations]]; and

*Consideration of desired BMP [[drawdown time]].

*Consideration of desired BMP [[Drainage time| drainage time]].

 

==Test Pit or Soil Boring Observations==

===Test Pit or Soil Boring Observations===

[[Test pit|Test pits]] or [[Design infiltration rate#Sampling|soil borings]] provide information regarding the soil horizons and overall soil conditions both horizontally and vertically in that portion of the site. Multiple observations can be made across a site at a relatively low cost and in a short time period.  

Test pits or soil borings provide information regarding the soil horizons and overall soil conditions both horizontally and vertically in that portion of the site. Multiple observations can be made across a site at a relatively low cost and in a short time period.  

Test pit excavations or soil borings should extend to a depth of between 2.5 - 5 m below ground surface or until bedrock or fully saturated conditions are encountered. It is important that the tests provide information related to conditions at least 1.5 m below the proposed bottom elevation of the infiltration BMP. Test pit trenches should be benched at 1 m depth intervals for access and infiltration testing.

Test pit excavations or soil borings should extend to a depth of between 2.5 - 5 m below ground surface or until bedrock or fully saturated conditions are encountered. It is important that the tests provide information related to conditions at least 1.5 m below the proposed bottom elevation of the infiltration BMP. Test pit trenches should be benched at 1 m depth intervals for access and infiltration testing.

*Strike and dip of soil horizons.

*Strike and dip of soil horizons.

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[[category:Infiltration]]

[[category:Infiltration]]