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5.3 BMP FEASIBILITY MAPLE ST <br /> Per Chapter 3, Section 4.5 of Volume I of the 2019 DOE Manual, On-site Stormwater Management BMPs for the <br /> project can be selected based on List#1. Below is a list of the evaluations for each of the BMPs: <br /> Lawn and landscaped areas: <br /> 1. Post-Construction Soil Quality and Depth in accordance with BMP T5.13 in Chapter 11 of Volume V of the DOE <br /> Manual. <br /> This BMP is feasible and will be used for all lawn and landscaped areas. <br /> Roofs: <br /> 1. Full Dispersion in accordance with BMP T5.30 in Chapter 5 of Volume V of the DOE Manual,or Downspout Full <br /> Infiltration Systems in accordance with BMP T5.10A in Section 4 in Chapter 3 of Volume V of the DOE Manual. <br /> Full dispersion is infeasible on the site due to insufficient area for the minimum required native vegetation flow <br /> path length of 100 feet <br /> 2. Rain Gardens in accordance BMP T5.14 in Chapter 11 of Volume V of the DOE Manual, or Bioretention in <br /> accordance with Chapter 5 of Volume V of the DOE Manual.The rain garden or bioretention facility must have a <br /> minimum horizontal projected surface area below the overflow which is at least 5%of the area draining to it. <br /> Both rain gardens and bioretention has been determined to be infeasible the site per the infeasibility criteria <br /> outlined in BMP T5.14 and BMP T7.30 of the 2019 DOE Manual.According to the USDA Soil Report, the site is <br /> underlain by"Alderwood-Urban land complex, 2 to 8%slopes". This soil type is categorized as a till soil and is <br /> typically not conducive for infiltration. Setbacks from the property line and structures cannot be met, hence an <br /> infiltration facility will not be feasible. <br /> 4. Perforated Stub-out Connections in accordance with BMP T5.10C in in Chapter 4 of Volume V of the DOE <br /> Manual. <br /> Due to on-site soils that are unsuitable for infiltration,perforated Stub-out Connections have been determined to <br /> be infeasible for this site per the infeasibility criteria outlined in BMP T5.10C in Volume V Chapter 4 of the 2019 <br /> DOE Manual.According to the USDA Soil Report, the site is underlain by"Alderwood-Urban land complex, 2 to <br /> 8%slopes". This soil type is categorized as a till soil and is typically not conducive for infiltration. <br /> Other Hard Surfaces: <br /> 1. Full Dispersion in accordance with BMP T5.30 in Chapter 3 of Volume V of the DOE Manual. <br /> Full dispersion is infeasible on-site due to insufficient area for the minimum required native vegetation flow path <br /> length of 100 feet as per BMP T5.30 of the 2019 DOE Manual. <br /> 2. Permeable pavement in accordance with BMP T5.15 in Chapter 5 of Volume V of the DOE Manual,or Rain <br /> Gardens in accordance with BMP T5.14 in Chapter 11 of Volume V of the DOE Manual, or Bioretention in <br /> JOB#19-336 <br /> Storm Drainage Report 5.6 <br />