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20141120105323625.pdfI L J1 November 17, 2014 Jeanie McConnell, Engineering Program Manager City of Edmonds, Engineering Division 121 Sth Ave North, Second Floor Edmonds, WA 98020 V C&A Proj # 117-002-14 RE: Harter Residence ADU 9630 238th St SW - Plan Check #BLD20140871 Response to 1st Plan Review Comments Dear Ms. McConnell: This letter presents our response to the Engineering Division Plan Review Comments for the subject project dated September 24th, 2014. The responses below correspond to each of the comments in the September 24th letter. ENGINEERING DIVISION COMMENTS 1. Please show all utility information on one plan, preferably the site grading and drainage plan. Information related to the gas meter and the side sewer appears to be complete on the site plan only. Other utility related information has been noted in the comments below. Please address these comments on the site grading, drainage, and utility plan. Response: Identification of existing utilities, as well as associated relocations, is called out on Sheet C2.0. This includes existing power, cable, gas, and water services, 2. Please provide the impervious surface calculations as shown on the plan in the table format provided below. Response: A table with this information is included on Sheet C2.0. 3. Show location of the existing water service line from the meter to the house. Response: The approximate location of the water service line is now shown on the plans. 4. (In summary) Provide an analysis of Stormwater Requirements for the project, and how they are met. Response: The project is located in the Edinonds Way Watershed, which is a Direct Discharge Basin. In accordance with the Storinivater Manual, small siteprojectsin Direct Discharge .Basins can be exemptfi-oin SSMR 47 if 'a quantitative offsite analysis confirms that there are no unacceptable downstream issues are found Downstream analysis of the project (See Section 3) has confirmed that there are no unacceptable downstream issues. In accordance with the storinivater manual, the project would be exemptfromthis requirement. However, based on discussions with the Cite ofEdinonds storinwater engineer, there have been flooding probleins in this basin. Due to these problems, the City indicated that they have been requiring flow control on all development projects in the basin. In response to this requirement, flow control will be design and constructed for the project. Sizing for the LID flow control.BMPs will follow the City of'Edflionds Simplified Sizing Handout PO -(206)484-3495 Harter Residence ADU Response to 1St Review Comments November 17, 2014 #E72B (Table S), and calculations are shown in the Drainage Report. Four trenches will be constructed to manage runoff from the roof, and from pavement areas. S. Clearly show/label impervious surface areas and proposed materials on the drainage plan. Include a. Driveway surface material, b. will there be a walkway connection between the new driveway and the ADU entry?, and c. Label the deck on the drainage plan and note as pervious or impervious. Response: Driveway surface is asphalt, now called out on the plan. No walkway connection is proposed with the addition. The deck is labeled on the drainage plan. 6. As the proposed retaining wall supports a surcharge, the design and calculations will need to be prepared by a licensed engineer and submitted to the City. Response: A response to this requirement will be provided by the Architect. 7. The wall drain outlets are shown both in the right-of-way and on private property at or near property lines and sloping toward adjacent properties. Stormwater runoff shall be managed on site and not directed to a neighboring parcel. Please revise plans as needed. Response: Wall drains (weep holes) are now shown entirely on site, discharging to rock pads, in accordance with the DOE manual. These discharges are allowed to occur and be directed toward neighboring parcels, as that is their natural discharge location. As long at the discharge meets DOE requirements (Dispersed via rock pads), they are allowed. 8. It appears as though the existing CATV location maybe in conflict with the proposed addition. Please indicate rerouting as needed. Response: A note has been added to the drainage plan to address this comment. We trust that we have address all of the comments in this letter, as well as the revised plans and report submittal herewith. If you have any questions regarding this response, please call me at (206) 484-3495. Regards, Cecil & Associates, LLC ` Roger J. Cecil, P.E.