Changes

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*[[Permeameter]]

*[[Permeameter]]

*Double ring infiltrometer

*[[Double ring infiltrometer]]

*Cased borehole ([[percolation test]])

*[[Percolation test]]

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*[[Grain size analysis]] (Hazen)

*[[Grain size analysis]] (Hazen)

==Planning for testing==

==Planning for testing==

===Background Evaluation===

===Background Evaluation===

Prior to performing testing and developing a detailed site plan, existing site conditions should be inventoried and mapped including, but not limited to:

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;

*Surficial geology and underlying stratigraphy;

#Watercourses (perennial and intermittent), water bodies, wetlands and floodplains;

*Watercourses (perennial and intermittent), water bodies, wetlands and floodplains;

#Small headwater drainage features;

*Small headwater drainage features;

#Topography, slope, and drainage patterns;

*Topography, slope, and drainage patterns;

#Existing land cover and land use;

*Existing land cover and land use;

#Natural heritage conservation areas; and

*Natural heritage conservation areas; and

#Other man-made features or conditions that may impact design such as existing nearby structures (buildings, infrastructure, etc.).

*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:

A sketch plan or preliminary layout plan for the proposed development should be evaluated, including:

===Sampling===

===Sampling===

The number of test pits or soil borings varies depending on site conditions and the proposed development plan. General guidelines are as follows:

The number of test pits or soil borings varies depending on site conditions and the proposed development plan. General guidelines are as follows:

{| class="wikitable"

{| class="wikitable"

! BMP Footprint (m²)

! BMP footprint (m²)

! test pit  

! Test pit  

! Bore hole

! Bore hole

|-

|-

| 2 || 0

| 2 || 0

|-

|-

| rowspan = 2|> 900 <br> (alternative)|| 1 every 450 m² || 2 every 450 m2

| rowspan = 2|> 900 <br> (alternative)|| 1 every 450 m² || 2 every 450 m²

|-

|-

| 2 every 450 m² || 0

| 2 every 450 m² || 0

|}

|}

 

* Tests must be conducted within 10 m of the infiltration practice footprint area.  

*For infiltration BMPs with footprint surface areas from 50 - 900 m², a minimum of two test pits or one test pit and two soil borings are required at, or within 10 m of the proposed location to determine the suitability and distribution of soil types present;

* Where multiple test are carried out, they should be planned equidistant and mapped accordingly.  

*For infiltration BMPs with footprint surface areas > 900 m², a minimum of one test should be conducted for each 450 m² of footprint area. Tests should be conducted equidistant from each other to provide adequate characterization of the area;

'''The recommendations above are guidelines'''

*For linear infiltration BMPs (e.g. [[bioswales]], [[enhanced grass swales]], [[infiltration trenches]], [[exfiltration trenches]]) a minimum of one test should be conducted within each soil mapping unit present along the proposed BMP location. Soil borings should be conducted every 50 m and a test pit should be conducted every 450 m; and

Additional tests should be conducted if local conditions indicate significant variability in soil types, geology, water table levels, depth and type of bedrock, topography, etc. Similarly, uniform site conditions may indicate that fewer test pits are required. Excessive testing and disturbance of the site prior to construction is not recommended.<ref>Christopher B. Burke Engineering LLC. (2009). Soil Infiltration Testing Protocol SOIL INFILTRATION TESTING PROTOCOL Purpose of this Protocol Who Should Conduct Testing. Retrieved from https://www.in.gov/ocra/files/Appendix%20F%20-%20Soil%20Infiltration%20Testing%20Protocol.pdf</ref>

*For sites with multiple infiltration BMPs, each with footprint surface area < 50 m², a minimum of one test pit is required and one soil boring per infiltration BMP location is recommended.

 

*The recommendations above are guidelines. Additional tests should be conducted if local conditions indicate significant variability in soil types, geology, water table levels, depth and type of bedrock, topography, etc.

*Similarly, uniform site conditions may indicate that fewer test pits are required. Excessive testing and disturbance of the site prior to construction is not recommended. <ref>Christopher B. Burke Engineering LLC. (2009). Soil Infiltration Testing Protocol SOIL INFILTRATION TESTING PROTOCOL Purpose of this Protocol Who Should Conduct Testing. Retrieved from https://www.in.gov/ocra/files/Appendix F - Soil Infiltration Testing Protocol.pdf</ref>

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