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

MAGNUSSON KLEMENC[C ASSOCIATES ■ INTRODUCTION This document has been initiated by Magnusson Klemencic Associates (MKA) for the Providence Regional Medical Center Everett (PRMCE) North Site project in Everett, Washington. This document is developed to satisfy the City of Everett Stormwater Management Manual (SWMM), Minimum Requirement 2, which requires the development of a Construction Stormwater Pollution Prevention Plan (CSWPPP) to address the prevention of erosion and discharge of sediment during construction. Since a contractor has not yet been identified, MKA has created this document without benefit of any input from the contractor that will be in charge of the site during construction. Areas of the CSWPPP that require input from the contractor have been noted as such. When the contractor is selected they will be required to take ownership of and update this CSWPPP to address project schedule and sequencing as well as planned means and methods to mitigate erosion that may result from construction activities. The CSWPPP is a living document reflecting current conditions and changes throughout the life of the project. These changes may be informal (i.e., hand-written notes and deletions). Update the CSWPPP when the Certified Erosion and Sediment Control Lead (CESCL) has noted a deficiency in Best Management Practices (BMPs), deviation from original design or when revisions are necessary because of changed conditons. The format of this document largely follows the general requirements for developing a CSWPPP outlined in Volume II, Chapter 2 of the SWMM. Because the site discharges to a combined sewer and not directly or indirectly to a receiving body of water, modifications have been made to reflect this condition in the requirements. PROJECT DESCRIPTION The North Site of PRMCE is located at 1815 13th Street and is bounded by 13th Street on the south, residential blocks to the north and east, and the Providence Regional Cancer Partnership facility to the west. The existing North Site contains PRMCE's Central Utility Plant (CUP) and temporary surface parking. See Figure 1 for a Vicinity Map showing the project location. In preparation for a future clinic facility to be constructed in the north third of the site, the North Site project will relocate existing utility infrastructure to avoid conflicts with the new clinic building. The project will also expand the existing parking lot to the west of the CUP to address increasing demands for parking. The existing stormwater detention ponds in the northeast corner of the site will ultimately conflict with the clinic facility footprint and so will be replaced with an underground detention vault east of the CUP. The project limits of work are shown on the Project Site Plan included as Figure 2. Additional information regarding the proposed site development is as follows: • Total site area— 8.98 acres within the property boundary. • Increase in impervious area —4.58 acres. This area includes the impervious area for a new clinic and surface parking at the north end of the site which will be under separate permit. • Total area of earth disturbance—2.77 acres, for the North Site project only. Construction Stormwater Pollution Prevention Plan Providence Regional Medical Center Everett, North Site, Everett, Washington