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I <br /> OMEGA2707 Wetmore Avenue <br /> ceol Everett, WA 98209 <br /> ENGINEERING, INC. t 425-387.3820 <br /> f 425.259.1958 <br /> d. As mentioned above, after further review of the project and the DOE manual, the <br /> rainage plan has been revised and there is no longer need for the landscaping <br /> infiltration trenches. This also eliminates the concern for infiltrating upgradient of <br /> the new houses, infiltration trenches being located on private properties and <br /> easements. Please see the revised plans and report for further explanation and <br /> documentation. <br /> Due to the drainage changes, there is no longer need for this easement. Please <br /> see c and d above as well as the revised drainage plans and report. <br /> t--f". N/A; see above. <br /> g. This channel has been removed and the WWHM calculations have been <br /> updated. However, this channel was modeled as an arbitrary element so that the <br /> — developed basin can have a single point of compliance. Per the DOE manual, a <br /> channel may be used when there are multiple elements being used so that <br /> everything ties together to a single point of compliance. <br /> h. The WWHM calculations for the permeable pavement have been revised. A 6- <br /> inch reservoir layer is being used. Also see below. <br /> i. Trench dam details have been added to the drainage plans. The WWHM <br /> calculations for the permeable pavement has been revised to include the trench <br /> dam. Since the storage capacity between the check dams will be half of the <br /> storage would be without check dams, the 6" reservoir layer was modeled as 3" <br /> rather than the full 8" thickness to account for the check dams. Please see the <br /> revised calculations in the appendix of the drainage report. <br /> j. N/A; see above. <br /> k. N/A; se above. Infiltration trenches are no longer needed on or for these lots. <br /> I. A separate O&M has been prepared and submitted with this resubmittal <br /> package. The 'drainage report has been revised to include the specified <br /> paragraph. Please see O&M manual and Section 11 of the revised drainage <br /> report. <br /> m. The O&M sheets are now copied correctly. <br /> n. Noted. • • <br /> Planning Reviewer:Niels Tvgesen <br /> 1. Revisions made per comments. See responses below. <br /> a. A landscape plan has been prepared and submitted with this resubmittal <br /> package: <br /> Thank you for taking the time to review the revised plans for this project. Please feel free to <br /> contact me with any questions you may have. <br /> Sincerely, - <br /> R chel A. Weinberg, P.E. <br /> Omega Engineering, Inc. - <br />