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. • Stormwater from the onsite system will be routed from the most downstream catchbasins inside the switching station via a culvert pipe that will discharge outside of the fence to the toe of the northerly and easterly fill slopes with an energy dissipation feature at the outflow. 2) Could waste materials enter ground or surface waters? If so, generally describe. • No. When the transformer is installed, an oil containment system will be installed to prevent any mineral oil insulating fluid leak from entering the storm water collection system or other discharge into the environment. d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any: • During construction temporary erosion control measures will be used such as filter fabric fences, mulching plastic covering, energy dissipation, and level spreaders. • The site development will include erosion control and water quality BMP's per the DOE Stormwater Manual, including vegetating permanent slopes. • A containment system will be provided that would collect mineral oil insulating fluid in the event of an accidental release from the transformer. 4. Plants a. Identity types of vegetation found on the site x deciduous tree: alder, maple, aspen, cottonwood, other: x willow, bitter cherry, evergreen tree: fir, cedar, pine x evergreen tree: fir, cedar, pine • x shrubs x grass pasture crop or grain x wet soil plants: cattail, buttercup, bulrush, skunk cabbage water plants: water lily, eelgrass, milfoil other types of vegetation cottonwood, red alder, salmonberry, lady fern, bentgrass b. What kind and amount of vegetation will be removed or altered? • Most of the undeveloped area of the site which will be developed is dominated by invasive species of Scots Broom and Himalayan blackberry with scattered areas of salal. ea 273