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Scope of Work:
¨ The project consisted of two major phases, the streambed / bank restoration and adjacent wetland restorations.
¨ Stream bed and bank restoration began with the realignment of the existing streambed to add sinuosity and establish the target criteria for path and slope. The total stream realignment was over 3,200 linear feet with a 93’ vertical drop. As the stream was realigned, new bed gravel (cobble / soil mix) was installed.
¨ Bank treatments were extensive and required regrading of the banks slopes to tie into the new bed alignment. Erosion protection then required the installation of coir logs, coir mats, erosion control blankets, and live stake plantings. Three increasingly complex bank treatment designs were called for depending upon the stream segment.
¨ In-stream structures were utilized for grade changes, erosion control, and habitat enhancement. Stone cross vanes (29 each) and cascades (46 each) were constructed in the upper segments with salvaged natural stone and imported cut stone. Stone structures in these areas were designed for grade changes and streambed stability. Log vanes (26 each) were built in the lowest segment primarily for habit enhancement.
¨ Previous wetland restoration work had left several acres with densely compacted, low organic soils that were not supporting wetland vegetation. Re-restoration of these areas included tilling the soils and blending peat moss into the matrix. The resulting soils were loose, irregular in surface and high in organics. Wetland seeding and shrub planting were used throughout these areas during the final stages of restoration.
¨ The combined plantings and seedings totaled over 6 acres of restored and seeded wetland, 665 shrub plantings, and over 24,000 live stakes. Additional habitat restoration included the construction of several vernal pools in wetland areas adjacent to the creek. |
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