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bld20160179 - Therrell Add - E3.pdf CITY OF EDMONDS PLAN REVIEW COMMENTS ENGINEERING DIVISION (425) 771-0220 City Website: www.edmondswa.gov DATE:October 12, 2016 TO:Robin Kearsley r@kearsleyhomes.com FROM:Jeanie McConnell, Engineering Program Manager jeanie.mcconnell@edmondswa.gov RE:Application #: bld20160179 Project: Therrell -Single Family ResidenceAddition Project Address: 8609 Talbot Rd During review of the above noted application, it was found that the following information, corrections,or clarifications are needed. Reviews by other divisions, such as Planning, Building, or Fire may result in additional comments. Please redline plans or submit three (3) sets of revised plans/documents with a written response to each of the items below to a permit coordinator. nd Resubmittals can be made at the Development Services Department on the 2floor of City Hall. Permit Center hours are M, T, Th & F from 8am-4:30pmand on Wednesdays from 8:30am-noon. City ofEdmonds handouts, standard details and development code can be referenced on the City website. Comments 1 –March 30, 2016 Comments 2 –August 19, 2016 Comments 3 –October 12, 2016 ok 1) 2)ok 3)ok October 12, 2016 comment –Thank you for providing a geotech report addressing the 4) infiltration system. Please address the comments provided below: 8/19/2016 comment –The plans have been revised to include additional impervious surface area. The proposed impervious area for the project appears exceed 2000sf and therefore, stormwater management shall be provided. a.ok October 12, 2016 –Please clearly identify the total for the “new”impervious b. surface area. Clearly note that the existing(remaining) driveway was constructed in 1967.Please remove the “net impervious area”as this is not applicableto stormwater thresholds. 8/19/2016 -Update the impervious surface area calculations shown on the plans to show all new impervious areas and existing pervious deck conversions to impervious. Credits for the removal of existing impervious areas are not granted if the existing structure is removed. c.ok October 12, 2016comment –Calculations have been providedand infiltration d. trenches have been shown on the plans. The infiltration system previously shown on the plans is also still shown and needs to be removed. In addition, the following needs to be added into the plans/design: i.The 4” Dia. Perf. Pipe in the infiltration trench must be at least 12” from the trench bottom. ii.The infiltration trench rock is specified as 1-1/2” washed rock. Per our Handout, it should be 1-1/2” to 1-3/4” washed rock. (preferably 1-1/2” to 2- 1/2”) iii.Both trenches need pre-treatment structures(catch basins), per City handout. 8/19/2016 -Include infiltration trench sizing calculations consistent with City Handout E72B. October 12, 2016–comment not addressed. Clearly show how flows will be e. directed on the driveway surface and label any structures that will be installed to capture flows and direct to infiltration systems. 8/19/2016 -Clearly show how runoff fromdriveway will be collected and discharged to the infiltration system. If the runoff from the new driveway area cannot be separated from the existing driveway, then the infiltration system will need to be sized to accommodate all runoff directed to the trench. Page 2of 2