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B. ENVIRONMENTAL ELEMENTS <br /> 1. Earth <br /> a. General description of the site: <br /> (circle one): Flat, rolling, hilly, steep slopes, mountainous, other: The site is generally flat, <br /> sloping to the northeast for drainage, with a steep slope to the West. <br /> b. What is the steepest slope on the site (approximate percent slope)? 2% <br /> c. What general types of soils are found on the site (for example, clay, sand, gravel, peat, <br /> muck)? If you know the classification of agricultural soils, specify them and note any <br /> agricultural land of long-term commercial significance and whether the proposal results in <br /> removing any of these soils: The site is paved with asphalt and concrete. The primary <br /> use is bus and passenger vehicle parking but also supports a maintenance facility, an <br /> administration and office building, and other ancillary transit facility support <br /> functions. The previous use of the site was a gravel borrow pit.There are steep slopes <br /> with native and non-native vegetation comprising the west boundary. Dense fill <br /> material composed of sand and till comprises the first 10-13 feet below grade. <br /> d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, <br /> describe. The slope west of the MCOB site is identified as an erosion/landslide hazard <br /> with both medium and high slopes as mapped by the City of Everett(2016). <br /> Community Transit has stated that the slope is an engineered slope to achieve <br /> stabilization during the borrow pit abandonment and reclamation. Hillslope drainage is <br /> managed by flexible pipes that drain overlandflow from terraced areas. <br /> e. Describe the purpose, type, total area, and approximate quantities and total affected area of <br /> any filling, excavation, and grading proposed. Indicate source of fill. Approximate quantities <br /> include: 12,494 cubic yards of PCC Pavement, 90 cubic yards of full depth paving, and <br /> 122 cubic yards of asphalt grind and overlay will be removed and transported to <br /> approved disposal sites. This total volume will be replaced by the proposed pavement <br /> section composed of 6 inch depth aggregate base (CSBC)and 10 inches of concrete <br /> overlay. 566 cubic yards of fill associated with drains and trenches will be removed <br /> with the same volume imported for pipe and drain replacement. 44 cubic yards of fill <br /> will be imported to reestablish grade for drainage along the uphill side of the west <br /> boundary stormwater conveyance trough. <br /> f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. It <br /> is not anticipated that erosion would occur as a result of this project. <br /> g.About what percent of the site will be covered with impervious surfaces after project <br /> construction (for example, asphalt or buildings)?There will be no new additional <br /> impervious surfaces added as part of this project. This project is for maintenance of <br /> the existing surfaces. <br /> SEPA Environmental checklist(WAC 197-11-960) July 2016 Page 7 Of 15 <br />