CP Lake Year 4 Monitoring
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Central Packwood Lake Vegetation Annual Report Permit No. WA0037338 Prepared for: TransAlta Centralia Mining LLC 913 Big Hanaford Road Centralia, WA 98531 Contact: Dennis Morr (360) 623-9318 Prepared by: Cascade Environmental Group, LLC 2800 N Lombard #803 Portland, Oregon 97217 (503) 894-8585 Contact: Tammy Stout June 2021 Cascade Environmental Group, LLC. Central Packwood Lake Vegetation Annual Report Permit No. WA0037338. June 2021. Portland, OR. Prepared for TransAlta Centralia Mining LLC, Centralia, WA. Table of Contents Section Page 1 Introduction 1 1.1 Site Description 1 1.2 Monitoring Report Details 1 1.3 Central Packwood Lake Reclamation Summary 2 2 Monitoring Methods 3 2.1 Vegetation Monitoring 3 2.2 Photographic Documentation 4 3 Monitoring Results 4 3.1 Vegetation 4 3.2 Additional Monitoring Observations 6 4 Summary and Recommendations 6 Figure and Appendices 7 Tables Page Table 1. Planted Vegetation Performance Standards and Results .............................................................. 5 Figures and Appendices Figure 1. Planting Zones and Monitoring Plan Appendix A. Planting Plan Appendix B. Photo Documentation Appendix C. Vegetation Data i ii 1 Introduction This short report describes compliance monitoring for Year 4 (2021) of the TransAlta Centralia Mining, LLC (TCM) Central Packwood Lake site. The original site design is summarized in the TransAlta Centralia Mine Central Packwood Reclamation Plan (Reclamation Plan; Norwest Corporation 2012). Cascade Environmental Group LLC assisted TCM with the planting component of the Reclamation Plan for the wetland, riparian forests, and aquatic habitat areas of the site. Plant installation was implemented in early spring 2017. Year 4 site monitoring took place in early summer in 2021. Site monitoring in this report addresses site vegetation growth of the wetland, riparian and lowland forests, and aquatic areas as outlined in the Reclamation Plan. Monitoring activities include assessing survival and development of planted vegetation and photo documentation of plant growth for the habitat areas created in the wetland, riparian forests, and aquatic areas of the Central Packwood Lake site; upland plantings in the larger Packwood larger “watershed” or drainage area are only qualitatively described. 1.1 Site Description The Central Packwood Lake is a large impoundment with a surface area of approximately 216.6 acres and a capacity of 13,400 acre feet. The lake is located along the northern perimeter of the Central Field adjacent to Big Hanford Creek. When the lake is full it discharges to Big Hanaford Creek. TCM revegetated the site with lowland forests, riparian areas, and wetland aquatic areas associated with the lake as set forth the Permit Application Package (PAP) for the TCM reclamation. The Central Packwood Lake habitat reclamation areas represent only one aspect of the larger reclamation plan for the Central Packwood area; plantings around the lake are the primary focus of this report. 1.2 Monitoring Report Details This monitoring report addresses the vegetation growth reporting requirements in Section S7 of the Department of Ecology NPDES permit that states: 1. Vegetation /plant growth update annual report. This report must include the drainage area that drains to the Central Packwood Lake and the channel from the Central Packwood Lake to Hanaford Creek. Permit number assigned by Ecology is: WA0037338. The report was prepared by: The report was prepared for: Cascade Environmental Group, LLC TransAlta Centralia Mining, LLC 2800 N Lombard #803 913 Big Hanaford Road Portland, Oregon 97217 Centralia, WA 98531 Contact: Tammy Stout (503) 894-8585 Contacts: Dennis Morr (360)330-8209 1 | Page Central Packwood Lake Reclamation Site – Year 4 Monitoring Report June 2021 This monitoring report covers Year 4 (2021) and the monitoring site visit occurred on June 2, 2021. This report primarily addresses the planted vegetation along the lakeshore, the lowland forests and riparian zones immediately adjacent to the lake, and both the inlet and outlet drainages (refer to the planting plan included as Appendix A). This monitoring report includes photo documentation, found in Appendix B. 1.3 Central Packwood Lake Reclamation Summary TCM is completing the re-establishment of riparian and wetland habitat in lowland areas of the mining reclamation area to provide areas for fish and wildlife by incorporating a diverse and broad range of trees and shrubs. Streams, wetlands and riparian habitat for fish and wildlife are being established in the Central Packwood Lake project area to restore habitats for deer, elk, coho salmon, steelhead and other fish and wildlife species. Grasslands, wetlands, riparian zones, and plant diversity along the re- established drainageways are an integral part of the reclamation plan to provide cover, edge effect, and food sources for the primary species as well as for other wildlife resources. In addition to providing habitat, riparian areas and wetlands are beneficial for flood storage, baseflow and groundwater support, erosion and shoreline protection, water quality improvement, biological support and wildlife habitat functions. As a result of the construction of artificial drainage channels for mining activities, many of the wetlands have been converted to riparian areas or pasturelands. TCM’s reclamation plan will recreate riparian and wetland habitat over roughly twice the area in which it existed under pre-mining conditions, of which Central Packwood Lake habitats are a component. Habitat reclamation at the Central Packwood Lake consisted of seeding appropriate seed mixes to the habitats, or installation of tubers, rhizomes, live stakes, emergent plugs, containerized and bare root plantings. The Central Packwood Lake habitat reclamation plan includes the following planting zones: • Riparian Forest (High Water Gradient) • Lowland Forest A • Lowland Forest B • Wetland • Littoral- Emergent Wetland • Littoral- Aquatic Wetland Seed mixes and planting palettes were specified for each individual planting zone as shown in Appendix A. Riparian Forest: Both the inlet and outlet channel was revegetated as a riparian vegetation community /stream channel; the shrubs and trees approved for planting in these areas include both 2 | Page Central Packwood Lake Reclamation Site – Year 4 Monitoring Report June 2021 upland and wetland plants as this zone includes wet areas in the floodplain and extends upslope from the floodplain. Although willows are included on the list of species, TCM did not plant willows in the riparian areas of the Central Packwood Lake outlet channel at the recommendation of National Marine Fisheries Services (NMFS) in its Essential Fish Habitat (EFH) consultation. Additionally, the channel bottoms were left unplanted; both measures that were requested by NMFS to augment fish habitat. A riparian seed mix was applied across these zones; species included in the mix range along the wet to dry gradient. Lowland Forest A and B: These forested areas also span the wet to dry gradient, with the Lowland Forest B occupying the wetter of the two. These habitats occupy the areas upslope from the inlet and outlet channels and comprise the majority of the acreage at the Central Packwood Lake site. These areas are primarily intended as wildlife habitat. Wetland: Wetland planting zones flank the inlet channel and were planted with seed mixes, emergent tubers or plugs, and woody stems. Wetland communities in the reclamation plan include both an emergent community and a scrub-shrub community. These plant communities provide habitat value and other wetland functional attributes such as cooling, shade, and improvement of water quality. Littoral Zones: These littoral zones are situated along the shore of the lake and provide area for the establishment of emergent plants. The zone provides wetland and shoreline habitat for fish and wildlife and consists of both emergent and permanently wet aquatic plants. Additionally, TCM placed habitat enhancement features (e.g. tethered logs, woody debris, root wads, etc.) at a density of approximately 1 feature per 2,500 square feet in the littoral zone around the perimeter of the lake and the inlet and outlet channels, or approximately 29 acres. 2 Monitoring Methods Monitoring was conducted on June 2, 2021 by qualified biologists, one of whom who assisted with plant installation, and the collected data were used to assess plant growth and survival. The vegetation was not assessed against performance standards, but quantitative estimates were made to determine approximate native stems per acre, to estimate cover of the seed mixes, and identify stems per acre of woody invasive species in order to inform maintenance activities. The following sections describe the monitoring methods used at the Central Packwood Lake site during the Year 4 monitoring effort. 2.1 Vegetation Monitoring Vegetation monitoring was completed with a repeat of prior years monitoring. Temporary vegetation plots measuring 25’x25’ were randomly placed in the Riparian, Lowland Forest A and B, and Wetlands planting zones as shown in Figure 1. For each plot, all stems were counted and tallied by species for tree and shrubs. Within the 25’x25’ plots, 2 smaller “nested” 3’x3’ herbaceous plots 3 | Page Central Packwood Lake Reclamation Site – Year 4 Monitoring Report June 2021 were established to estimate the cover the herbaceous layer. Within each nested plot dominant species (observed to be covering more than 20% of plot area) were noted. To estimate herbaceous