This sixteen unit townhome development was created in coordination with Northstar Mountain Properties' Highlands development at the Northstar-at-Tahoe ski resort in Truckee, California near Lake Tahoe. The conceptual design for the development centered on the idea of a housing project with the ability to ski from the comfort of your home. The ski in / ski out grading concept has been greatly accepted by the homeowners, developers, and the public. Environmental emphasis was implemented with the use of erosion control measures and underground infiltration systems. The use of these underground infiltrators reduces the possible eye sores typically created with detention ponds. Underground infiltrators minimize the possibility of erosion that would require maintenance to stay in compliance with the Lahontan Regional Water Quality Control Board of California. Working closely with the Architect the units were located to maximize views, save trees, and match the surroundings of the alpine area. The design of this project entailed site grading, design of the sewer, storm drain, and water main. The design conforms to the Storm Water Management Manual (SWMM) and the Placer County Land Development Manual per Placer County code requirements, along with the strict requirements of the Lahontan Regional Water Quality Control Board of California. A Technical drainage report for the development was created to size the hydraulic systems and the on-site retention needed to negate the downstream effects of the proposed development.
Sierra Sunrise is a proposed 50 unit residential condominium development on a 15.5 acre site near Tramway Drive, off of Kingsbury Grade, in Douglas County, Nevada. The site is very close to the Lake Tahoe Basin and the Heavenly ski resort that has ski lifts at the end of Tramway drive. Therefore, the site will see a good amount of snow and is very steep with large areas of rock outcroppings and stands of tall conifer trees. Because of the topography and natural conditions of the site our vision for the design is to minimize the development footprint and disturbance area, thus preserving well over half of the site. Instead of spreading the development areas throughout the site we are proposing a relatively compact building footprint. This allows us to minimize the areas required for vehicular circulation and utilities to service the building. The civil engineering is fairly complicated as many retaining walls are required to minimize the construction footprint on the steep slope, while maintaining strict storm water quality control measures. In addition, required parking will be located under the building footprint to limit the amount of grading and tree removal that would be required for surface parking. Sustainable design, “Green,” elements will include maximizing open space, protect/restore habitat, limiting both roof and non-roof heat island effects and light pollution reduction. The project proposes to use both active and passive solar design to optimize energy performance as well as investigating other forms of on-site renewable energy; using recycled, reused, rapidly renewable and regionally extracted and manufactured materials on both the interior and exterior of the building; and working with the General Contractor to develop a construction waste management plan to recycle and divert as much material from local landfills as possible.
Telesto provided planning, surveying and engineering services for the Kings Beach Housing Now project for Domus Development in North Lake Tahoe, California. The Kings Beach Housing Now project will demonstrate substantial environmental, social and economic benefits for the region. The project aims to provide new income restricted housing and environmental improvements that will enhance the quality of life contributing to the long-term economic vitality of the region. The housing will promote a healthier environment through green buildings, storm water management and “smart growth” practices. By also supporting higher density infill development and increasing transit ridership, it will counter the environmental ills associated with sprawled development. The project builds on key redevelopment opportunities utilizing existing disturbed, blighted or underutilized properties. Through unique partnerships with Placer County, local community groups and landowners, the project proposes to build approximately 90 units of walkable, sustainable affordable housing and mixed use commercial on approximately 3.5 acres. The engineering involves enhanced designs to protect water quality in the Lake Tahoe area. The project includes the coordination with various Placer County agencies and the Tahoe Regional Planning Agency to provide affordable housing in the Kings Beach area. The project consists of 6 sites throughout the Kings Beach area that will be developed to provide approximately 100 units. The project falls under the Placer County EQ & TRPA CEP, or community Enhancement Program, which requires close coordination with Placer County for the CEP submittal. Coordination with Caltrans was required to develop a joint use storm water treatment facility along SR-28. Civil design for the project requires knowledge and use of the Placer County Land Development Manual, the Placer County Storm Water Management Manual, the TRPACode or Ordinances and Caltrans Standard Specifications and Details.
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The Springer Mine project entailed the design of a new tungsten tailings impoundment with a two year capacity as well as a rehabilitation of an existing tailings impoundment with a ten year capacity. A mill design production rate of 1000 tons per day was used for calculations. In addition to an earthwork and grading analysis, the Welsh Hagen team had to plan for and mitigate a possible spill occurring at the mill and the potential offsite storm event. This was accomplished by the introduction of a small capacity detention pond upstream of the tailings impoundments for spills at the mill site and a large flat bottom channel diverting storm water flow around the tailings impoundments. The SCS TR-55 Manual was used in conjunction with the HEC-HMS software to tabulate the offsite flows impacting the proposed development. The storm events analyzed were the (24 hour) 5 year, 100 year, 1000 year, and the probable maximum precipitation (PMP). The PMP event is defined by the NOAA National Weather Service as “ , the greatest depth of precipitation for a given duration that is physically possible over a given size storm at a particular geographical location at a certain time of the year.” Typically, a diversion channel would be designed for the 100 year storm event. Due to the potential discharge of Cyanide solution from the dump, the PMP event was used to design the diversion channel maintaining an adequate factor of safety. The design of both impoundments needed to meet current environmental regulations, therefore, each impoundment was designed with a 60 mil high density polyethylene (HDPE) liner. The Welsh Hagen team also designed the slurry distribution system as well as the under drain and seepage collection systems
Victoria Gold Corporation has located rich deposits of gold near the McCoy Cove Mine located 30 miles south of Battle Mountain. The Cove Helen Underground Exploration Project will consist of a portal opening along the north wall of the McCoy Cove pit and is estimated to decline to 2,000 ft below the portal entrance. The Cove decline will require dewatering in order to construct the decline and reach the underground target. A dewatering treatment system consisting of various basins have been designed to treat water prior to infiltration. In addition, temporary mining facilities will be constructed to service and maintain equipment operations and ore stockpile storage. All ore material removed from underground operations will be stored within a lined containment facility and transported offsite for gold and silver recovery. A slope stability analyses was conducted to estimate an approximate set-back distance from the historic open pit failure zone to insure safe design and placement of facilities for mining operations.
The project includes the following components:
- Construction of a decline portal to access the underground Helen Zone target
- Design of a lined waste containment facility and temporary ore stockpile for bulk sample storage
- Temporary maintenance facilities and pump house
- 100 Acre dewatering system o de-nitrification basins o sedimentation basin o rapid infiltration basin
Most of the land in Nevada is public land. Consequently, many of Welsh Hagen Associates's client projects involve working closely with the two major public land agencies in Nevada: the Forest Service (FS) and the Bureau of Land Management (BLM). Some of the projects that WHA is currently involved with on public lands include:
- Gryphon Gold Corporation’s – Borealis Mine – FS
- Isabella/ Pearl LLC – Isabella Mine - BLM
- Taylor Western Resources LLC – Victoria Mine - BLM
- Ireland Inc.’s – Columbus Salt Marsh – BLM
Most of this work involves land planning, infrastructure development, and permitting proposed exploration and facility development activities on public lands. Issues that are addressed in the process include:
- Availability of electrical power or natural gas
- Inventory of existing access, rights-of-ways, etc.
- Air Quality – visual impacts
- Water – erosion and sedimentation, water quality
- Impacts on Cultural and Biological Resources
- Public Safety
- Land Use – post mining activities, reclamation and re-use of infrastructure
An excellent understanding of the land use regulations of these two public land agencies has been developed over the years along with a keen understanding of geospatial infrastructure distribution. More importantly what has been developed is an exceptional insight in to the potential symbiosis between present day activities and the potential of future development that can capitalize on the infrastructure associated with the present land use activities when they cease to occur.