4800 DOGWOOD DR 2022-02-28 - Laserfiche WebLink

A portion of the wetland buffer to be enhanced consists of a sparsely vegetated area that is located adjacent to the parking lot (which consists of maintained lawn and gravel). A portion of the vegetated buffer area contains invasive species; these invasive species will be removed from the buffer. Due to the steep slopes located in the buffer, WRI recommends that woody invasive species, such as Himalayan blackberry (Rubus armeniacus), be cut and stumps treated immediately with an herbicide approved for use in wetlands, such as glyphosate, with an oil or other carrier. This treatment is most effective in the fall. This approach will avoid potential erosion of the steep slope that could result from soil disturbance associated with grubbing out the roots by mechanical means. Herbicide shall be applied by a licensed applicator,with City approval, following all label recommendations. This buffer enhancement plan is designed to improve the function of the on- site buffer by replacing degraded buffer areas with a diverse and complex native plant community. 9.1 BUFFER ENHANCEMENT PLANTING PLAN A portion of the enhancement area currently consists of gravel. The gravel shall be removed and the area decompacted prior to planting. Following decompaction, 3 inches of premium topsoil shall be tilled into the top 6 inches of existing soil. The topsoil amendment shall have at least 15 percent organic content. If the buffer area that currently consists of maintained lawn is found to be compacted, the above procedure shall be implemented in this area as well prior to planting. The remaining portions of the buffer contain a mix of native and invasive species. After removal of invasives, native plants will be interspersed as needed in these areas. After site preparation, the enhancement area will be planted with the following species. Quantities may be adjusted as needed at the time of planting: Buffer Enhancement Planting(9,686 square feet) Common Name Latin Name Size Spacing Quantity Douglas fir Pseudotsuga menziesii 5 gallon 9' 15 Western hemlock Tsuga heteroplylla 5 gallon 9' 15 Big leaf maple Acer macrophyllum 5 gallon 9' 15 Vine maple Acer circinatum 1 gallon 6' 15 Red elderberry Sambucus racemosa 1 gallon 6' 15 Salmonberry Rubus spectabilis 1 gallon 6' 14 Snowberry Symphoricarpos albus 1 ga Ion 6' 14 Baldhip rose Rosa gymnocarpa 1 gallon 6' 14 Oregon grape Mahonia nervosa 1 gallon 6' 14 Sword fern Polystichum munitum 1 gallon 6' 20 After plant installation, mulch will be installed in rings around each new shrub and tree. No less than 2 to 4 inches of woodchip mulch shall be applied in a circle (at least 2-foot radius) around the installed plant. Woodchips shall be kept at least 2 inches from the trunks or stems of woody plants to prevent plant damage. Any exposed soil in the enhancement area after plant installation and mulching shall be seeded to the recommended native grass seed mixture below, or a similar approved mixture. View Ridge Community Church 9 Critical Area Report and Buffer WRI#16092 Averaging/Enhancement Plan November 21,2016