1815 13TH ST SEPA 016 - 013 - PRMC NEW CLINIC BUILDING Land Use Decision Documents 2025-04-21

EVALUATION FOR AGENCY USE ONLY The fill materials and other materials such as gravel borrow, washed gravel, and compost -amended soils for plantings will be obtained from permitted commercial sites. f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. Erosion could potentially occur during site grading. With use of erosion and sediment control Best Management Practices (BMPs), it is expected that the risk for erosion is reduced and minimal levels of sediment would potentially be transported during construction. g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? The proposed development will consist of 67 percent impervious surface. h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any: No significant adverse impacts are anticipated. Application of erosion and sediment control BMPs would be used throughout project construction and a Stormwater Pollution Prevention Plan prepared. These BMPs would be in place around disturbed areas, stockpiles of excavated materials, and in proximity to stormwater catch basins. Active construction areas would be maintained to prevent sediments from entering storm drainage systems. Protective covering would be placed over exposed soil areas to prevent sediments and other contaminants from being transported offsite. Bare soil areas would be seeded and/or planted where required after establishment of final grades. 2. AIR a. What types of emissions to the air would result from the proposal (i.e., dust, automobile, odors, industrial wood smoke) during construction, operation and maintenance when the project is completed? If any, generally describe and give approximate quantities if known. Construction of the project would result in temporary, localized increases in pollutant emissions from construction activities and equipment. For example, dust from excavation and grading would contribute to ambient concentrations of suspended particulate matter. Construction contractor(s) would have to comply with the Puget Sound Clean Air Agency's (PSCAA) Regulation I, Section 9.15 requiring reasonable precautions to minimize dust emissions. Reasonable controls may include applying water or dust suppressants during dry weather, and vehicle washing and street cleaning to prevent dirt, mud and other debris deposits on paved roadways open to the public. Environmental Checklist — Providence Regional Medical Center Everett — North Site Page 7 © SHOCKEY