§ 21-130. Rubble fill; design criteria.

(a)

The design of the proposed rubble fill accompanying an application for a license shall include one (1) or more topographic maps and development plans to a scale of not over two-hundred (200) feet to the inch with contour intervals of two (2) feet.

(b)

Such maps and plans shall include the following:

(1)

Area location map.

(2)

Limits of property of the proposed rubble fill site.

(3)

Location of all buildings within fifteen-hundred (1,500) feet of the site.

(4)

The proposed fill area or areas.

(5)

Borrow pit areas, if any.

(6)

Access roads.

(7)

Access control. Access to the fill site shall be through permanent gates or barricades with locking devices. Appropriate physical measures such as ditching, banking, or fencing shall be made to prevent indiscriminate access at other locations.

(8)

Information as to the character of the soil to the depth of at least five (5) feet below the proposed or intended excavation operations, or natural ground where fill is intended to be placed on top of the natural ground; (refer to the County Soil Survey Report published April 1970). All rubble fill cover shall be composed of earth or other approved material of such character that it can be compacted to provide tight seal, will not crack excessively when dry, and shall be free of putrescible substances. Under the above standards, cover material must be acceptable to the administrator, Department of Permitting, Inspections, and Enforcement, prior to utilization.

(9)

Finish contours and erosion control:

(A)

Finish contours shall be based on the future development of the sites as an open space, or for recreational purposes, according to the following criteria:

(i)

Individual lifts in rubble fills shall be no greater than eight (8) feet in depth, after which there must be an intermediate, well-compacted earth cover, at least twelve (12) inches in depth, including side slopes.

(ii)

Final compacted covering for the surface and side slopes shall consist of a minimum twenty-four (24) inches of compacted earth cover.

(B)

Surface gradient. The surface of the fill shall be smooth-graded; minimum permissible slope is 1:100. Maximum slope of the sides to the toe of the completed fill shall not be greater than three horizontal and one vertical (3:1).

(10)

Sediment and erosion control. All plans and specifications accompanying rubble fill applications for licenses shall include provisions for both interim (temporary) and ultimate (permanent) erosion and sediment controls.

(A)

The design, installation and maintenance of erosion and sediment control measures shall be accomplished in accordance with the requirements of the County Soil Conservation District, and of related County ordinances. The current approved set of "Standards and Specifications for Soil Erosion and Sediment Control in Urbanizing Areas" are on file and available for inspection at the Department of Permitting, Inspections, and Enforcement. Such standards and specifications are specifically approved and adopted by reference as if set forth in full herein.

(B)

All graded surfaces with particular emphasis on the face of all cut and fill slopes, shall be seeded, sodded or otherwise protected from erosion as soon as practicable and shall be watered, tended and maintained until growth is well established at the time of completion and final inspection.

(11)

Special drainage devices. Diversion channels of adequate size and grade based on runoff estimates from the area above the fill sites, dikes and levies shall be provided as required. If the surface-water control and the above means are not sufficient, further measures to control drainage shall be taken, such as grade stabilization structures, flumes, vegetated or lined drained outlets or other means. All structural drainage devices must comply with the Department of Permitting, Inspections, and Enforcement and Washington Suburban Sanitary Commission design standards.

(12)

Flood plain encroachment. Where flood plains exist, filling will not be permitted to encroach on the fifty (50) year flood plain, unless such filling is a part of an approved flood control project in accordance with Article 21 of the Building Code.

(13)

Fencing. All necessary fencing and gates to control unauthorized traffic to the site shall be shown.

(14)

Exclusions. Specifications shall provide that no garbage, ashes, rubbish, trash, offal, industrial refuse, commercial refuse or hazardous and special wastes will be acceptable at, or able to be deposited within the rubble fill. The definitions of words and phrases as contained in Division 1 of this Subtitle are made fully applicable to the prohibitions contained here. In addition, major appliances (such as refrigerators, stoves, television sets and the like), equipment, furniture and other bulky items are similarly prohibited.

(15)

Woodland and wildlife habitat conservation. A Type 1 Tree Conservation Plan prepared in conformance with Division 2 of Subtitle 25 and The Woodland and Wildlife Habitat Conservation Technical Manual.

(Gen. Res. No. 18-1970, Sec. 1; CB-49-1984; CB-31-2010; CB-27-2014)