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r <br /> • The proposed grading and bioretention underdrainage would not preserve <br /> the existing basin boundaries for Basin A and Basin B, as documented in <br /> the Drainage Report. Update the plans and/or report as needed for <br /> consistency. <br /> Bioretention is no longer proposed. See new plan set. <br /> • The grading in the northern potion of the project site would result in little <br /> or no flow to the proposed bioretention facility in the northern portion of <br /> the site. <br /> • Specify actual curb locations and grading in the grading plan that <br /> will provide the drainage patterns as documented in the Drainage <br /> Report. Showing simplified even spacing of curb cuts, without <br /> review of resulting drainage patters, or deferring the decision to the <br /> contractor regarding where specifically to locate curb cuts is not <br /> acceptable unless it is demonstrated in the design plans,report, <br /> and/or specifications that the installed conditions would provide <br /> the intended drainage patterns. See related comments above <br /> regarding bypass areas and modeling of BMP effectiveness. <br /> Bioretention is no longer proposed. See new plan set. <br /> • Review curb cut locations throughout and optimize for effective collection <br /> of runoff. Several curb cut locations shown would not effectively receive <br /> flow and several areas where curb cuts are needed do not have curb cuts <br /> provided. <br /> Bioretention is no longer proposed. See new plan set. <br /> • Downspout Infiltration Trenches: <br /> • Per comments on the Drainage Report, size the downspout <br /> infiltration trenches in accordance with Downspout Full Infiltration <br /> (BMP T5.10A) in the SWMMWW. Document the feasibility and <br /> sizing section MR#5 of the Drainage Report and ensure the <br /> facility size and configuration matches that sizing. <br /> Infiltration Trenches are no longer proposed. See new Drainage <br /> Report. <br /> • Cow-tongue dispersion splash blocks are shown in the plan view, <br /> which would allow roof runoff to enter bioretention facilities;but <br /> the documentation indicates that all roof runoff would be directed <br /> to separate downspout infiltration trenches. The designs and <br /> documentation conflict and must be resolved. <br /> PO Box 1478 • Everett, WA 98206 • Phone: (425) 303-9363 <br /> Fax: (425)303-9362 • Email:info@insightengineering.net <br />