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On-Site Stormwater Management BMPs for MR#1-5 Projects (continued). <br /> Other <br /> Simplified infeasibility criteria Feasible/infeasible? <br /> Check box if criterion is true. Only one box needs to be checked to Provide justification if <br /> Priority BMP name indicate that the BMP is infeasible. infeasible. <br /> 2 BMP T5.15: Selection of any of the following criteria does not require input See previous page <br /> Permeable from a licensed professional,although some may require <br /> Pavements professional services: <br /> (continued) ❑ The native soils below a pollution-generating permeable <br /> pavement(e.g., road or parking lot)do not meet the criteria <br /> for runoff treatment in the SWMMWW,Section V-5.6.(Note: <br /> A 6-inch layer of sand may be used to provide treatment.) <br /> ❑ Where replacing existing impervious surfaces unless the <br /> existing surface is a non-pollution generating surface over an <br /> outwash soil with an infiltration rate>_4 inches per hour. <br /> ❑ Field testing indicates the site has a measured infiltration rate <br /> <0.30 inches per hour.Only small-scale PIT or large-scale PIT <br /> methods in accordance with SWMMWW Section V-5.4 shall <br /> be used to evaluate infeasibility of permeable pavement areas. <br /> (Note:Unless other infeasibility restrictions apply, roads and <br /> parking lots mayinclude an elevated underdrain within the <br /> base course,if flow control benefits are desired.) <br /> ❑ Roads with more than very low traffic volumes(<_400 <br /> vehicles),and areas with more than very low truck traffic. <br /> (Note:This doesnotapply to sidewalks and othernon-traffic <br /> bearing surfaces). <br /> ❑ Areas having more than very low truck traffic:roads and <br /> otherareas not subject to through truck traffic that may receive <br /> up to weekly use by utility trucks(e.g.,garbage, recycling), <br /> daily school bus use,and multiple daily use by pick-up trucks, <br /> mail/parcel deliverytrucks,and maintenance vehicles.(Note: <br /> doesnotapply to sidewalks and othernon-traffic bearing <br /> surfaces). <br /> ❑ Site land use requires oil control BMPs per SWMMWW <br /> Section III-1. <br /> ❑ Area has"industrial activity"as defined in 40 CFR <br /> 122.26(b)(14). <br /> ❑ Elevated risk of concentrated pollutant spills such as at gas <br /> stations,truck stops,and industrial chemical storage sites. <br /> ❑ Site is in a frequent snow zone where routine, heavy <br /> applications of sand occur to maintain traction. <br /> ❑ Saturated conditions<1 foot of the bottom of the <br /> permeable pavement BMP due to seasonal high <br /> groundwater or an underlying layer with low permeability. <br /> (Note:The bottom of the permeable pavement BMP is the <br /> bottom of the lowest layer that has been designed to be <br /> part of the BMP,such as the lowest gravel base course or <br /> a sand layer used for treatment below the permeable <br /> pavement.) <br /> City of Everett Public Works <br /> Small Project Stormwater Site Plan/Report—Sept.2023 Page 26 of 40 <br />