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→Native Soil
===Native Soil===
===Native Soil===
Bioretention can be constructed over any soil type, but hydrologic soil group A and B are best for achieving water balance objectives. Facilities designed to infiltrate water should be located on portions of the site with the highest infiltration rates. For infiltration rates <15 mm/h an underdrain is recommended. Native soil infiltration rate at the proposed location and depth should be confirmed through in-situ measurements of hydraulic conductivity under field saturated conditions.
Bioretention can be constructed over any soil type, but hydrologic soil group A and B are best for achieving water balance objectives. Facilities designed to infiltrate water should be located on portions of the site with the highest infiltration rates. For infiltration rates <15 mm/h an underdrain is recommended. Native soil infiltration rate at the proposed location and depth should be confirmed through in-situ measurements of hydraulic conductivity under field saturated conditions. See [[Design infiltration rate]] for further guidance.
===Wellhead Protection===
===Wellhead Protection===
Facilities receiving road or parking lot runoff should not be located within the 2 year time-of-travel Wellhead Protection Area for municipal drinking water supply wells (refer to applicable drinking water source protection plan for details).
Facilities receiving road or parking lot runoff should not be located within the 2 year time-of-travel Wellhead Protection Area for municipal drinking water supply wells (refer to applicable drinking water source protection plan for details).