9600 SHARON DR EXPLORER MIDDLE SCHOOL 2022-03-11

Task 3: List #1 approach to MR #5 compliance You are required to use the first applicable BMP that is considered feasible in each 0 category (lawn, landscape, and hard surfaces) below. Mark whether the BMP is feasible or infeasible. If you selected infeasible, cite the reasons for infeasibility (see Worksheet 2) and or a professional, site specific reference to supporting documentation (such as a geotechnical report). List #1: On -Site Stormwater Management BMPs for MR #1-5 Projects Feasible Infeasible If infeasible provide justification BMP T5.13: Post -Construction Soil Quality Whil - no disturbances to existing landscap and Depth —1 new andscaped areas are proposed as part pro.icct any landscaped areas disturbed as a Feasible Infeasible If infeasible provide justification BMP T5.10A: Downspout Full Infiltration* X. `Solli retort retgiuired fqr this BMP or imr a ion o orestc or native ve ervious area cannot he acheived. BMP 5.30: Full Dispersion Thc re is not at least 3 meet or more of pen BMP T5.14A: Rain Gardens* _ *Soils report required for this BMP or The minimum vertical separation of I foot to the hardpan (Glacial Till) wou BMPT7.30: Bioretention Cells, Swales, al not be achievedbelowbioretention th and Planter Boxes would serve a drainage area less than the above thresholds. BMP T5.1013: Downspout Dispersion The required vegetated flowpath downstream of tie downspouts is Systems not feasible. BMP T5.10C: Perforated Stub -out The only location available for the Connections X perforated stub -out connectionis under impervious surface No other hard surfaces proposed. Feasible Infeasible If infeasible provide justification BMP T.530: Full Dispersion —1 BMP T5.15: Permeable Pavements* —.I *Soils report required for this BMP or BMP T5.14A: Rain Gardens* F_ I or BMPT7.30: Bioretention Cells, Swales, and Planter Boxes BMP T5.12: Sheet Flow Dispersion F_ —1 or BMP T5.11: Concentrated Flow Dispersion I L * If you selected BMP T5.10A Downspout Full Infiltration submit 1 and 3 below. * If you selected BMPT5.15 Permeable Pavement or T5.14A Rain Gardens in List#1, on -site soils information for sizing or infeasibility determination is required from 1 through 4 below. Submit the following information to Permit Services with this report: 1) A USDA Custom Soil Report from websoilsurvey.sc.egov.usda.gov 2) Small-scale Pilot Infiltration Tests (PIT) per SWMMWW specifications 3) USDA Soil Type(s)= 4) Measured Infiltration Rate = in/hr (from PIT) City of Everett Public Works Small Project Stormwater Site Plan Report -Dec 2019 18 d areas or it the result of the nuance with etation area ieable soil fro