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d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, <br /> describe. <br /> No slumping or major cracks in the asphalt can be observed on the Property and immediate vicinity, <br /> indicating unstable soils are not likely in the immediate vicinity. <br /> e. Describe the purpose,type,total area,and approximate quantities and total affected area of any <br /> filling,excavation,and grading proposed. Indicate source of fill. <br /> The purpose of the Proposal is to excavate,remove and dispose of the contaminated soil onsite. The total <br /> excavation area is approximately 4,500 square feet with an approximate average excavation depth of 13 <br /> feet. The proposal for this Property includes the excavation of approximately 2,475 cubic yards of soil, <br /> which 100 cubic yards or 1500 tons are expected to be petroleum-contaminated material(soil). The area <br /> of excavation will be backfilled with structural fill that includes(from bottom of excavation to top): <br /> quarry spoil,suitable on-site clean overburden soils,clean free draining non-organic gravel or sand with <br /> 5%max passing#4 sieve, and 30%minimum retained on the#4 sieve, 6 inches of 5/8 inch minus crushed <br /> rock, and 4 inches of hot mix asphalt. <br /> f. Could erosion occur as a result of clearing,construction,or use? If so,generally describe. <br /> No. Erosion could not occur as a result of demolition or excavation activities. <br /> g. About what percent of the site will be covered with impervious surfaces after project <br /> construction(for example,asphalt or buildings)? <br /> 100%, no change from existing <br /> h. Proposed measures to reduce or control erosion,or other impacts to the earth,if any: <br /> A shoring wall will be completed on the south-excavation wall along the existing detail shop building <br /> subsequent to demolition,prior to starting any excavation work. All excavation walls will comply with <br /> the angle of repose and protected during periods of in climate weather with plastic sheeting. <br /> 2.Air <br /> a. What types of emissions to the air would result from the proposal during construction,operation,and <br /> maintenance when the project is completed?If any,generally describe and give approximate <br /> quantities if known. <br /> Diesel exhaust emissions will be produced during demolition and remediation work from heavy <br /> equipment. Dust will not be generated during demolition or excavation and will be controlled by use of <br /> water, if any dust generation is noted. No operations or maintenance work is included with the proposed <br /> scope of the project. The completed project will not produce any emmisions to the air. <br /> b. Are there any off-site sources of emissions or odor that may affect your proposal? If so, <br /> generally describe. <br /> SEPA Environmental checklist(WAC 197-11.960) July 2016 Page 4 of 16 <br />