6133 LAKE CHAPLAIN RD 2025-08-19

Step 5.3: Select which BMPs shall be installed from the Tables below. The following tables summarize infeasibility criteria that can be used to justify not using[`� g various on-site stormwater management BMPs for each surface type category (lawn and landscaped areas, roofs, and other hard surfaces)to comply with MR#5. Where any inconsistencies or lack of clarity exists,the requirements in the main text of the SWMMWW shall be applied. For each surface type, evaluate the feasibility of the BMPs in order of their listed priority. Some BMPs have the same priority and can be evaluated concurrently. You are required to use the first applicable BMP that is considered feasible for each surface type. Once you've determined the first applicable BMP to your site move to the next category(table). In the third column, record which infeasibility criteria (if any) applies by marking the check boxes. Only one infeasibility criterion must be selected in the third column to justify infeasibility of a BMP. Use the last column to record whether each BMP is feasible or infeasible, whether it can be skipped because the project is flow control exempt(due to direct discharge), and cite any supporting documentation (such as a geotechnical report). On-Site Stormwater Management BMPs for MR#1-5 Projects. 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. 1 BMP T5.13: ❑ Lawn and landscape area is on till soil slopes>33 percent. ❑ Infeasible Post- 0 Feasible Construction Soil Quality Justification: and Depth Roofs 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. 1 BMP T5.10A: ❑ Evaluation of infiltration is not required per the Infiltration ❑ Infeasible Downspout Infeasibility data available on Map Everett. ❑ Feasible Full ❑ Within 10 feet of any structure,property line,or critical area. Infiltration ❑ Within 50 feet from the top of slopes that are greater than 20 Justification: percent and over 10 feet of vertical relief. ❑ Site is upgradient of a septic system drainfield. ❑ Site slope is>25 percent. Attach supporting ❑ Site does not have outwash or loam soils. documentation if this ❑ <3 feet of permeable soil from the proposed final grade to BMP is feasible: the seasonal high groundwater table, hardpan layer,or other ❑ USDA Custom Soil impermeable subsurface layer. Report ❑ <1 foot of permeable soil from the proposed bottom of the ❑ USDASoilType(s) infiltration system to the seasonal high groundwater table, ❑ Separation to hardpan layer,or other impermeable subsurface layer. groundwater and hardpan City of Everett Public Works Small Project Stormwater Site Plan/Report—Sept.2023 Page 22 of 40