6133 LAKE CHAPLAIN RD 2025-08-19

On-Site Stormwater Management BMPs for MR#1-5 Projects (continued). Category Simplified infeasibility criteria Feasible/infeasible? Check box if criterion is true. Only one box needs to be checked to Provide justification if Priority BMP indicate that the BMP is infeasible. infeasible. 2 BMP T7.30: Bioretention If Bioretention Cells,Swales,and Planter Boxes are used,a separate full Stormwater Site Cells,Swales, Plan Report must be submitted by an engineer and this template cannot be used. Planter Boxes 3 BMP T5.1013 For dispersion trenches: ❑ Infeasible Downspout ❑ Within 5 feet of the edge of the trench and any structure or ❑ Feasible Dispersion property line. Systems ❑ <25 feet vegetated flow path between the trench outlet andJustification: any downstream property line,structure,stream,wetland,or impervious surface. ❑ <50 feet vegetated flow path between the trench outlet and any slope>15 percent. ❑ Discharge point would be upslope of primary and reserve septic drainfield areas. For splash blocks: ❑ <50 feet vegetated flow path between the downspout and any downstream property line,structure,stream,wetland,slope> 15 percent,or other impervious surface. ❑ Discharge point would be upslope of primary and reserve septic drainfield areas. 4 BMP T5.10C ❑ Evaluation of infiltration is not required per the Infiltration ❑ Infeasible Perforated Infeasibility data available on Map Everett. ❑ Feasible Stub-out ❑ Discharge point would be upslope of primary and reserve septic Connections drainfield areas. Justification: ❑ <1 foot of permeable soil from the proposed bottom(final grade)of the perforated stub-out connection trench to the highest estimated groundwater table, hardpan,or other impermeable subsurface layer. ❑ Site would be under impervious or heavily compacted soils. ❑ Site setbacks and design criteria provided in DCSS Section 4- 4.1(3)cannot be achieved. City of Everett Public Works Small Project Stormwater Site Plan/Report—Sept.2023 Page 24 of 40