1707 SCENIC DR SNO CO PUD 2020-03-10

SEPA ENVIRONMENTAL CHECKLIST FOR Beverly Park Switching Station Expansion AGENCY P.U.D. NO. 1 of Snohomish County USE f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. • Minor erosion could occur depending on weather at the time of clearing and grading but will be controlled by temporary erosion control measures taken during construction. • No erosion is anticipated upon completion. g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? • The percentage of the existing site currently covered by impervious surfaces is approximately 5 % of the 5.6 acres for the project which includes equipment pads and a control enclosure within the switching station fence and concrete slabs/foundation north of the existing switching station. The existing control enclosure,equipment pads and the concrete/slabs will be removed as part of the project. • When the project is complete, the percentage of the 5.6 acres that will have impervious surfaces will be approximately 2.7 %. Area includes equipment pads and a control facility within the switching station fence. • The switching station will be surfaced with a with a 4" layer of pervious coarse crushed rock surface with a void ratio of approximately 30% within the fenced area. h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any: • Temporary erosion control measures, such as mulching and filter fences will be used to control erosion during construction, in accordance with State and local storm water management requirements. • As part of the site design all exposed slopes disturbed by the construction will be stabilized with permanent erosion control measures such as mulching and/or hyrdoseeding prior to the removal of the temporary erosion control facilities. • An oil containment facility will be provided around the transformer slab. 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 and when the project is completed? If any, generally describe and give approximate quantities if known. • Construction vehicle exhaust emissions and dust may be generated during the 6 to 8 month construction period. • The District requires that all of its contractors operate equipment that meets all legal requirements which would include emission standards in effect at the time of construction •