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ii. English Ivy (Hedera helix); <br /> iii. Himalayan blackberry (Rubus discolor, R. procerus) and evergreen blackberry (Rubus <br /> laciniatus); <br /> iv. Scot's broom (Cytisus scoparius). <br /> 4. Public and private pedestrian paths and trails. Public and private pedestrian trails, including <br /> interpretive signage, overlooks, and benches, may be permitted subject to the following criteria <br /> and subject to approval by the director: <br /> a. The trail or path is designed to minimize impacts to the critical area and its buffer. The trail <br /> is located on the outer edge of the buffer, except for areas which provide for public viewpoints or <br /> educational opportunities and which are designed to minimize the footprint of the trail/path <br /> within the critical area or its buffer. Trails and paths shall not be permitted when critical area <br /> functions will be substantially degraded. <br /> b. The trail surface meets all other requirements including all applicable water quality <br /> standards. Use of pervious surfaces is encouraged. <br /> c. Critical area and buffer widths shall be increased where possible, equal to the width of the <br /> trail corridor, including disturbed areas. <br /> d. Trails proposed to be located in landslide or erosion hazard areas shall be constructed in a <br /> manner that does not increase the risk of landslide or erosion and in accordance with an approved <br /> geotechnical report. <br /> e. Public and quasi-public trails shall include interpretive signs identifying the critical area and <br /> buffer specific to the site. <br /> 5. Stormwater facilities are allowed in stream and wetland buffers subject to all of the <br /> following criteria: <br /> a. Stormwater management facilities are permitted only within the outer twenty-five percent of <br /> the buffer. <br /> b. The subject buffer area has been previously substantially and legally altered and is <br /> unvegetated, sparsely vegetated, and/or vegetated with nonnative or invasive species. <br /> c. Stormwater facilities shall be integrated into the stream or wetland buffer as a natural <br /> drainage system. The slopes and all areas that are disturbed shall be planted with native <br /> vegetation consistent with a buffer enhancement/mitigation plan. Above ground concrete walls <br /> and structures are not permitted. Below grade structures may be permitted only if it can be <br /> shown to the satisfaction of the planning director that the use of such materials fits with the <br /> 11 <br />