Bowman provided construction quality assurance (CQA) services. The project includes site preparation, utility abandonment, earthwork for the stability buttress, Gila and San Pedro River crossings, constructed drainage to the emergency ponds and emergency channel, storm water management systems, and other improvements.

Bowman provided designs and documentation services. including review of existing drawings and project information, engineering calculations, process and instrumentation drawings, process flow diagrams, piping/mechanical drawings, sections details, mechanical equipment list and specifications and electrical and instrumentation controls.

Our team was hired by U.S. Silica, a nationwide sand and aggregate company, to conduct volume analysis on stockpiles as a third-party inventory verification. We have performed volume analysis scans every quarter since 2014 in various states, including Texas, New Mexico, Oklahoma, Louisiana, Pennsylvania, Ohio, West Virginia, Maryland, North Dakota, and Montana.

Bowman was retained to provide detailed design of concrete footings and steel pipe supports for this Intermediate Leach System (ILS) which includes two pipelines.

Bowman performed value engineering and design optimization for the phase II design of a leach pad in a canyon with aggressive slopes (~2.5H:1V). The design included liner subgrade, geomembrane and GCL, solution collecting pipe network, and overliner drain rock.

Bowman performed the engineering design and construction quality assurance for multiple stormwater retention dams. The design process included watershed analyses, lithological investigation and interpretation, earthen structure stability analyses, and flow considerations for a 100-year storm event.

Bowman provided the concrete slabs, foundations, and anchor designs for new infrastructure for the expansion of the Hydromet area to allow the SX/EW facili-ties to handle increased throughput. This work included the structural design and drawings, identifying civil components such as tops of concrete on footings and slabs, ensuring drainage to the existing drain sump and the addition of a contain-ment curb to improve capture of spills.

As a result of a new pit being developed at the mine, a haul road was developed from the pit to the existing crushing facility. Bowman designed six (6) culverts that allow stormwater to flow under the new haul road.

Bowman, having previously designed the original settlers during another project, designed two new Wash Settlers with related structures, containment, equipment, storage, piping and instrumentation.

Bowman designed three stormwater diversions to protect a leach pad. These diversions required the engineering design of several structures including channels, levees, energy dissipation structures and box culverts. In conjunction with these designs, Bowman developed method specifications for compaction and a design for soil cement that utilized the material sourced from the channel excavation.