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All surface excavations authorized through an unclassified use permit shall comply with the following requirements and standards:

A. The surface excavation shall be screened from all adjacent state highways, parks, schools, residential areas and commercial areas as required in Chapter 17.88.

B. The operation shall maintain noise levels no greater than those established in the comprehensive development plan and Chapter 173-60 of the Washington Administrative Code.

C. Operations shall be limited to those hours set by the city council.

D. All surface and ground water discharges from the property where the excavation occurs shall comply with state of Washington standards both during operational and reclamation phases.

E. Peak storm water runoff shall not be increased beyond levels naturally occurring at the site prior to commencement of excavation.

F. Excavations made to depths of two feet or more below the low groundwater mark that create a standing body of water shall be reclaimed in the following manner:

1. All banks of soil, sand, gravel or other unconsolidated materials shall be sloped to four feet below the summer low water level at a grade no greater than a 3:1 ratio;

2. Portions of solid rock banks shall be stepped or other measures taken to permit a person to escape from the water.

G. Side slopes of unconsolidated materials within an excavation pit shall be no steeper than one and one-half feet horizontal to one foot vertical.

H. The slopes of walls in rock or other consolidated materials shall have no prescribed angle of slope, but where a hazardous condition is created that is not indigenous to the immediate area, the quarry shall be either graded or backfilled to a slope of one foot horizontal to one foot vertical.

I. The peaks and depressions of all spoil banks, berms, or dikes shall be reduced to a gently rolling topography to minimize erosion and to resemble contours within the general vicinity.

J. Stagnant water shall not be allowed to collect or remain on the surface excavation area. Drainage systems shall be constructed or installed to avoid such conditions if natural drainage is not possible.

K. All materials used in reclamation of the excavation site shall be of nonhazardous, nonnoxious, nonreactive, nonflammable, noncombustible solids unless a permit has been granted for a construction material or sanitary landfill.

L. Acid-forming materials within excavation sites shall be covered with at least two feet of clean fill to prevent the water pollution. The final surface covering shall be graded so that surface water will drain away from the disposal area.

M. The site shall be revegetated as appropriate to the future use of the site.

N. Surface excavations disturbing streams must comply with requirements established by the state of Washington for excavation, reclamation, and landscaping.

O. Soils susceptible to erosion must be shielded and/or contained on the site.

P. Dust shall be controlled so that none drifts beyond the boundaries of the property of the excavation.

Q. Excavation is permitted only for the amount provided in the permit.

R. All reclamation activities shall be completed within two years of the cessation of excavation.

S. The property owner and any successors in interest shall maintain the reclaimed site in compliance with the reclamation plan and any conditions of approval. Any modifications to the approved reclamation plan shall be processed as a new permit application.

T. Reclamation plans shall be initiated at the earliest possible time after completion or discontinuance of mining any segment of the excavation.

U. The types of landscaping utilized around the excavation site should be compatible with nearby uses.

(Prior code § 11.023.180)