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bld20160179 - Therrell Add - E4.pdf CITY OF EDMONDS PLAN REVIEW COMMENTS ENGINEERING DIVISION (425) 771-0220 City Website: www.edmondswa.gov DATE:November 10, 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 Comments 4 –November 10, 2016 A revised geotech memohas been received and the plans have been updated with several notes. A more concise list of plan review comments is being provided below, instead of going item by item from the preivous plan review comments. It is challenging to represent civil construction plan related items, including stormwaterelements,on anarchitectural site plan. It may be best to separate civil improvements from the overallsite plan to provide the necessary clarity. 1.The infiltration trench design is wrongly specified by reference to Fig. 3.2 of the 2005 DOE SWMM. The City’s infiltration trench is specified in Figure A-3 of Handout E72B. The differences are the depth of trench varies and the wash rock specification provides for more storage.Please revise memorandum and plans accordingly. 2.The infiltration sizing factor of 4.0% is meant for 3 foot depth of aggregate. Figure 3.2 of the 2005 DOE SWMM only specifies 18-inches of aggregate depth,onlyhalf of the required depth.Revise plans and memo accordingly. 3.The Infiltration Sieve Analysisprovided in the geotech memorandum, shows termination of the particle size distribution at 0.074 mm (#200 sieve). This is consistent with the Unified Soil Classification System. The City specifies the use of USDA for soil classification. See City handout E72D. 4.Provide additional information for each of the storm lines connecting roof and driveway runoff to the infiltration trenches, includingpipe size, material, slope, inverts, length, and intended construction method(a portion of the pipe is shown under theexisting driveway). 5.The larger trench is specified as 86-feet in the trench length calculation, yet is shown as 88- feet on the plan.Please confirm 88-feet is what you intend to construct. 6.Provide information for each of the pre-trench collection systems. Callout catch basin size, pipe connectionsand invert elevations. 7.Provide a detail on how the infiltration trenches will overflow to Talbot Road. Infiltration trenches are flat bottomed, hence overflow from the system will be everywhere along the trench unless a specific overflow has been designed.Please keep in mind that the property slopes to the northeast, so as designed,thisis the direction the overflowfrom the system would naturallygravitate which would negatively impact the adjacent property owner. 8.A filter fabric fence has been shown along thesouthwest property line, which is on the uphill side of the project. Revise plans to show the silt fence on the down slope sideof the project. The silt fence shall be placed such that it prevents sediment from leaving the site during construction. Page 2of 2