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20121030160550039.pdfov-ED,V DATE: October,, 2012 TO: Brad Hinthorne PLAN REVIEW COMMENTS ENGINEERING DIVISION (425)771-0220 City Website: vvww.ecl_rrn<7ndsw;a,ag y Brad.hinthome@perlcinswill.com FROM: Jeanie McConnell, Engineering Program Manager RE: Application #: bld20120661 Project: Swedish Medical Center Project Address: 21704 Highway 99 During review of the above noted application, it was found that the following information, corrections, or clarifications are needed. Please redline plans or submit three (3) sets of revised plans/documents with a written response to each of the items below to Linda Thomquist. City of Edmonds handouts, standard details and development code can be referenced on the City website. Review 1 — September 11, 2012 Review 2 — October 16, 2012 Review 3 — October 25, 2012 GENERAL 1. October 25, 2012 — Thank you for revising the cost estimate per the comments emailed on October 16'x`. Based off the approved cost estimate the following bond amount and inspection fees have been applied to the project: a. Bond amount (ROW, storm & TESC) = $494,738.91 b. Inspection Fee= $13,241.09 ($27,131.51 less $13,890.42 credit from previous permit) 10/16/12 — Cost estimate was provided and is currently under review. 9/11/12 - Please provide an itemized engineers cost estimate, including units and unit prices, for both on-site and off-site (right-of-way) improvements, including traffic control. The City recommends use of the King County Site Improvement Bond Quantity Worksheet. o A bond is required to be placed for all right-of-way improvements. The amount of the bond will be based on 120% of the City approved estimate for all right-of-way improvements. The City will inform you of the appropriate bond amount after review of the cost estimate. Bond forms can be obtained from Marie Harrison, Permit Coordinator — 425-771-0220 or l fan q flgca) a „ecmmlniond wa s o Inspection fees for this project will be calculated at 2.2% of the 120% City approved estimate for all improvements. As inspection fees were paid under the previous permit and some but not all of the improvements were installed, it will be necessary for you to clearly bld20l2O661-Swedish_MedicaN—Ctr-E3.doc Page 1 of 4 outline this with your submittal so it can be determined what additional inspection fees are due. 2. ok 3. ok 4. ok STORMWATER MANAGEMENT REPORT October 25, 2012 comments - Review of the Drainage Report dated October 2012 and associated drawings was completed by Stormwater Engineer Jerry Shuster. If you have specific questions regarding these comments please contact Jerry directly by phone at 425-771-0220 or by email at .�a�'w_,wlGc.�ster cl)�cl�zr�a;rc�s7.v�r:.g�)d' 10/16/12 comments were based on review of the Drainage report and associated drawings dated September 2012. 9/11/12 comments were based on review of the Drainage Report dated August 2012. GENERAL 1. ok 2. ok Page 4 — Runoff Treatment 1. October 25, 2012 - The memo from Wade Watkinson, P.E., dated October 18, 2012 states "Per email from Jerry Shuster on 10/17/12 and the DOE Stormwater Manual the treatment train shown provides for enhanced treatment. Please note, the e-mail did not approve the treatment train. The text on page 5 of the Drainage Report adequately describes a treatment train approved for enhanced treatment by the 2012 Ecology Stormwater Management Manual for Western Washington and once the drainage report is approved the treatment train will be approved. October 16, 2012 — ok 9/11/12 comment - ok 2. ok Page 5 — Flow Control 1. ok Appendix D — "Raingarden & Vault Model — Mitigated Scenario — Rain ag rden 1. ok 2. ok 3. ok Appendix E — Pond Calculations 1. ok October 16, 2012 comments: 1. ok 2. ok 3. ok Page 2 of 4 4. ok 5. October 25, 2012 - comment partially addressed. The riser diameters are still not specified on Sheet C-441. The orifice sizes on Pond 2 are not acceptable (0. 4, 0.33, and 0.2 inch diameter). Minimum orifice size is 0.5 inch diameter due to clogging (Edmonds Stormwater Supplement). Please provide an alternate design for the outlet structure. Another option may be to use BMP T5.13 (Post -Construction Quality & Depth) as specified in the Ecology Stormwater Manual in the ponds which then can be modeled as "pasture " in WWHM. While the runoff from the "pasture" will not be as low as `forest, " a scenario exists where no orifices would be needed on the ponds and additional detention could be provided in the vault. That way the combined ou flow from the vault and the ponds (at CB -11 Sheet 410) could meet the flow control standard. 10/16/12 comment - Sheet 441- Details 1 & 3 and modeling for these structures - The diameter of the riser pipes are not specified but should be. For Pond 1, the modeling uses the following parameters for the outlet structure: rectangular notched riser with a notch height of 0.5 ft and notch width of 0.0417 ft. The bottom orifice is specified at 0.5 inches. The detail does not show a notched riser and the size of the orifice is not specified. For Pond 2, the modeling shows a flat riser, (no notch) and 3 orifices. The detail shows a rectangular notched riser and one bottom orifice at 0.5 inches. Please reconcile. 6. October 25, 2012 - comment partially addressed. Detail C is still not right. The modeling has a notch height of 1.3 ft and the detail shows 1.4 ft. The arrows for the dimension "Bottom of Riser to Outlet invert" are confusing. Please revise. 10/16/12 comment - Sheet C-451, Detail C - There are measurement callouts of "2.0" and "2.8" on this detail that are difficult to understand. Please revise. SHEET C-300 - PAVING & HORIZONTAL CONTROL PLAN 1. ok 2. ok 3. ok 4. ok 5. ok 6. ok 7. ok 8. ok 9. ok 10. ok SHEET C-330 - PAVING DETAILS 1. ok 2. ok 3. ok 4. ok 5. ok 6. ok 7. ok 8. ok 9. ok 10. ok Page 3 of 4 SHEET C-500 — UTILITY PLAN 1. A 2. A 3. A 4. A 5. A 6. A 7. A 8. A 9. A 10. A 11. ok 12. A 13. A 14. A 15. ok 16. A SHEET C-520 — UTILITY DETAILS 1. ok SHEET C-522 — UTILITY DETAILS 1. A 2. A SHEET C-523 — UTILITY DETAILS 1. ok Please contact meat 425-771-0220 or by e-mailIlLslygg)Y ifyou have specific questions regarding these plan corrections. Page 4 of 4