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Low Impact Development Manual for Michigan - OSEH - University ...

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Designer/Reviewer Checklist <strong>for</strong> Infiltration Trenches, Infiltration<br />

Basins, Dry Wells, and Subsurface Infiltration Beds<br />

Was the Soil Infiltration Testing Protocol followed?<br />

Appropriate areas of the site evaluated?<br />

Infiltration rates measured?<br />

Was the Infiltration BMP followed?<br />

ITEM YES NO N/A NOTES<br />

Two-foot separation between the bed bottom and bedrock/<br />

SHWT?<br />

Soil permeability acceptable?<br />

If not, appropriate underdrain provided?<br />

Adequate separations from wells, structures, etc.?<br />

Natural, uncompacted soils?<br />

Level infiltration area (e.g., trench bottom, bed bottom)?<br />

Excavation in infiltration area minimized?<br />

Hotspots/pretreatment considered?<br />

Loading ratio below 5:1?<br />

Storage depth limited to two feet?<br />

Drawdown time less than 72 hours?<br />

Positive overflow from system?<br />

Erosion and sedimentation control?<br />

Feasible construction process and sequence?<br />

Geotextile specified?<br />

Pretreatment provided?<br />

Clean, washed, open-graded aggregate specified?<br />

Stable inflows provided (infiltration basin)?<br />

Appropriate per<strong>for</strong>ated pipe, if applicable?<br />

Appropriate plants selected, if applicable?<br />

Observation well/clean out provided, if applicable?<br />

Maintenance accounted <strong>for</strong> and plan provided?<br />

LID <strong>Manual</strong> <strong>for</strong> <strong>Michigan</strong> – Chapter 7 Page 217

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