1815 13TH ST SEATTLE CHILDRENS NORTH CLINIC 2019-07-08

MAGNUSSON KLEMENCIC ASSOCIATES .�■ project will disturb more than 1 acre of land and so is required to prepare a CSWPPP as part of this requirement. The DOE does not require coverage under the General Permit or the preparation of a CSWPPP for systems discharging to combined sewer; per the DOE's Construction Stormwater General Permit Special Condition S1.B.2.a, operators of construction activities that discharge to a combined sewer are exempt from these requirements. With this in mind, the North Site project proposes a "modified" CSWPPP, specifically addressing the BMPs applicable and appropriate for discharging to the combined sewer. With no contractor currently engaged on the project, a framework for the project's CSWPPP has been included in Appendix E. It is understood that the contractor will ultimately be responsible for the final preparation of the CSWPPP and implementation of the measures outlined in this document. Once on board, they will work to edit this framework based on their proposed sequencing as well as their preferred means and methods for construction. V_.__ SOURCE CONTROL PLAN The Activity Worksheet has been reviewed (Figure 1.1 in Volume IV, Chapter 2, of the COESWMM) and it is confirmed that there are no point sources of pollution on the site that could affect the stormwater drainage system. Therefore, Minimum Requirement#3: Source Control of Pollution is met with no action required. VI. SPECIAL REPORTS AND/OR STUDIES Existing soil types are described in the project geotechnical investigation prepared by GeoEngineers titled "Geotechnical Engineering Design Report, Central Utility Plant West Parking Lot, Everett Washington for Providence Regional Medical Center," dated April 22, 2016. A copy of this report is included in Appendix B.1. This current report summarizes and updates the recommendations provided in the previous report titled "Geotechnical Design Services, Central Utility Plant Parking Lot, Everett Washington for Providence Regional Medical Center," dated October 17, 2012, which was prepared by GeoEngineers for the CUP Parking project completed in 2013. This second report has been included in Appendix B.2, as it addresses items such as infiltration rates for the site, which are not re-summarized in the current report. VII. OTHER PERMITS Table 3 summarizes the other regulatory permits and requirements to be considered, as listed in Appendix A of the COESWMM. Table 3. Regulatory Permits Permit Description Applicability Storm Drainage Report 7 Providence Regional Medical Center Everett North Site, Everett, Washington