Treatment Guidance
Treatment guidance provides recommendations for the preservation and repair of individual landscape characteristics of Boyd Smelter/ Mill Site. Treatment guidance is presented according to seven landscape characteristics - natural systems, topography, views, circulation, structures, small-scale features and vegetation. Treatment guidance also covers proposals for new development within the landmark boundary. Natural Systems Boyd Smelter/ Mill Site was built on Boulder Creek to access fresh water for industrial smelting and mining operations. Boulder Creek was modified to accommodate these operations. • Preserve characteristics associated with the site's historic use and retain it as an important part of the natural system. Topography Historic topography consists of the open level area and two reservoirs defined by earthen berms and a concrete dam/ headgate on the east and west sides. The reservoirs were covered with fill material, but portions remain visible. • Protect the open level area and earthen berm. Circulation Pedestrian circulation consists of contemporary features including Boulder Creek Greenway and a soft surface trail adjacent to Boulder Creek. Both trails are built over archeological features and are non-contributing features. • Provide access to Boulder Creek, picnicking areas, and archeological features, where appropriate. Structures Original structures are associated with smelting and milling operations - the north and south pylons (waterline supports) and concrete dam and headgate. • Protect contributing structures in original locations. • Preserve and repair the north and south pylons extant structural features. ○ Inject cracks in the masonry units using a mortar and/or epoxy appropriate for the base material. ○ Replace missing stones with appropriate replacement stones if the originals cannot be found. ○ Deeply rake mortar joints and replace with a soft mortar to match the properties of the original mortar to be compatible with the softest stones (based on a mortar analysis of a sample to be taken from the pylons). Provide periodic maintenance of mortar. ○ Apply a parge coat to the horizontal top surfaces of the pylons using an appropriate parging material. ○ Remove biogrowth with an appropriate cleaner based on a cleaning trial. ○ Monitor the streambank for under cutting near the bases of the pylons and coordinate with other agencies on actions to prevent erosion and to mitigate potential loss of structure. • Preserve and repair the steel girders' extant structural features. ○ Conduct further investigations to verify concrete foundation element at the north end of the steel elements. If a new foundation is necessary, etch the construction date into the concrete so that the new foundation is discernible from the historic resource. ○ Remove rust from steel elements with a wire brush and/or chemical cleaners (to be determined by a cleaning trial prior to construction). Paint surfaces of with a galvanizing paint. Provide periodic maintenance of paint. ○ Remove biomass growth and trees from around steel elements.
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Boyd Smelter/Mill Site
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