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Figure 6. Construction and grouting are done behind coffer dams in a dry environment so <br />that toxins and excess sediment are not released to the stream flow. <br />Concern has also been expressed over the use of grout in the river. Past improvements at <br />the Smelter Boating Park have revealed that the stability of individual rocks of almost any <br />usable size is not possible. This conclusion is supported by calculations and past experience <br />in similar rivers. The use of grout in rivers, though contentious, can be done responsibly. <br />Recreation Engineering and Planning is the nation's leader in the responsible usage of grout <br />in- stream and has pioneered technologies that allow the grout to remain hidden, allow for <br />interstitial spaces for macro - invertebrates, allow for fish migration upstream and <br />downstream, and provide for the overall stability of the structure, thereby virtually removing <br />regular in- stream maintenance requirements. The construction methods used for this grout <br />represent current best practice standards and are done in a dry environment such that no <br />toxins are released to the stream flow and there is no effect, long or short term, on the <br />habitat outside of the park. Short term effects in the selected reach are limited to <br />construction impacts and the structures represent a net positive improvement to the <br />environment at the conclusion of the project. <br />Riparian restoration is an important component of the proposed project. Preservation and <br />restoration of riparian corridors provides increased aquatic and terrestrial habitat for species <br />that are dependent on the river's ecosystem. This project seeks to restore degraded riparian <br />corridor throughout the city by planting vegetation, preserving endangered and native <br />vegetative populations, and removing non - native species such as tamarisk and Russian olive. <br />22 <br />