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sedimentation basins and filtration systems to be volume reduction practices. <br />If this permit prohibits infiltration as described in (9) below, other volume <br />reduction practices, a wet sedimentation basin, or filtration basin may be <br />considered. <br /> <br />(1) Specific site conditions may make infiltration difficult, undesirable, or <br />impossible. Some of these conditions are listed in Table 2 and <br />may qualify the applicant for Alternative Compliance Sequencing. <br />The applicant may also submit a request to the City for Alternative <br />Compliance Sequencing for site conditions not listed below. All <br />requests shall indicate the specific site conditions present and a <br />grading plan, utility plan, and the submittal requirement listed in <br />the table below. <br /> <br />Table 2. Alternative Compliance Site Conditions* <br />Type Specific Site Conditions Submittal Requirements <br />Potential Contamination <br />Potential Stormwater Hotspots <br />(PSHs) <br />PSH locations and flow <br />paths <br />Contaminated Soils State Permitted Brownfield <br />Documentation, Soil <br />Borings <br /> <br />Physical Limitations <br />Low Permeability (Type D <br />Soils) <br />Soil Borings <br />Bedrock within 3 vertical feet <br />of bottom of infiltration area <br />Soil Borings <br />Seasonal High Groundwater <br />within 3 vertical feet of bottom <br />of infiltration area <br />Soil Borings <br />Karst Areas Soil Borings <br /> <br />Land Use Limitations Utility Locations Site Map <br />Adjacent Wells Well Locations <br /> * Alternative Compliance is allowed for the volume reduction portion only. <br /> <br />Alternative Compliance Sequencing. To the maximum extent practicable, <br />the volume reduction standard shall be fully met onsite. <br />3. Infiltration systems must be prohibited when the system would be <br />constructed in areas: <br /> <br />(a) That receive discharges from vehicle fueling and maintenance <br />areas, regardless of the amount of new and fully reconstructed <br />impervious surface. <br />(b) Where high levels of contaminants in soil or groundwater may be <br />mobilized by the infiltrating stormwater. To make this <br />determination, the owners and/or operators of construction activity <br />must complete the MPCA’s site screening assessment checklist, <br />which is available in the Minnesota Stormwater Manual, or <br />conduct their own assessment. The assessment must be retained <br />with the site plans.