Geocon provided a geotechnical investigation for the proposed sewer main along Indian Canyon Drive in Palm Springs, California. The project involves installing a new PVC sewer main, epoxy-coated ductile iron pipe within a carrier pipe, and manholes, with the pipeline crossing multiple existing utilities and Union Pacific Railroad (UPRR) tracks. 

The investigation evaluated subsurface and geologic conditions along the sewer alignment to develop geotechnical recommendations for design and construction. The scope included site reconnaissance, field exploration, laboratory testing, engineering analysis, and preparation of a geotechnical investigation report. 

Fieldwork involved excavating six 8-inch diameter continuous core borings to depths of 16 to 41 feet using a hollow-stem auger drilling machine and advancing four 6-inch diameter borings up to 60 feet deep using rotary sonic drilling methods. Selective boring logs from prior investigations near the alignment were also used to interpret the subsurface conditions. Laboratory testing determined the physical and chemical properties of the collected soil samples. 

Geocon’s extensive tunneling experience allowed for a development of a geotechnical report which addressed the required jack and bore pit construction and shoring as well as the tunneling which is required beneath the railroad tracks to install the sewer main. 

Geocon continues to support the project and provide geotechnical input during the civil design and bidding phases.  

The ISA revealed the site to be assessed for ADL to assist in development management and disposal options, along with asbestos containing materials (ACM) and lead containing paint (LCP) assessments to obtain permits from the South Coast Air Quality Management District (SCAQMD).