water/wastewater management projects

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Representative highlights of Willdan Geotechnical's recent water and sewer projects are presented below.

morongo water tankClient: Morongo Band of Mission Indians
Project: Above Ground Water Tank

The proposed above ground water tank for a new casino was located within a State of California Alquist-Priolo Fault Zone and County of Riverside Fault Hazard Zone for the San Gorgonio Pass Fault. The investigation included a 300-foot, 11-foot deep trench to identify potential faults. Recommendations were made about mitigation strategies as required. Seismic hazard analysis included development of a site-specific response spectra for the eastern terminus of San Bernardino Mountain segment of the San Andreas fault which is located less than ½ mile from the site.  Recommendations for mitigating the potential for settlement up to 4 inches induced by the strong ground motion were provided in the report.

la canada flintridge sewerClient: City of La Cañada Flintridge, California
Project: New Sanitary Sewer System

Willdan Geotechnical performed geotechnical investigation services and construction monitoring for 89,000 lineal feet of new sanitary sewer system to replace septic tanks. The investigation consisted of 70 exploratory borings, soil sampling and logging, geotechnical laboratory testing, engineering analyses, recommendations for trench shoring, and bedding and backfill requirements.  Our field representative was onsite performing observation and testing during installation of the sewer pipes.

Willdan Geotechnical
1515 South Sunkist Street, Suite E
Anaheim, California 92806
714.634.3318
Fax: 714.634.3372
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Willdan Geotechnical is a subsidiary of Willdan Group, Inc.