Residential areas typically represent a low risk of soil or groundwater contamination. However, if the area is served by septic systems (individual sewage treatment systems or ISTS), determine the location of nearby septic systems and determine groundwater flow direction at the site. This can be obtained from local groundwater flow maps. Calculate the extent of a mound beneath the infiltration practice to ensure the mound does not intersect a plume from a septic system.
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