Guasti Environmental Services

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Situated at the base of the San Bernadino Mountains, Ontario is located in the midst of Southern California’s most accessible highways in the Inland Empire at the junction of the 10 (San Bernadino), 15 (Ontario) and 60 (Pomona) Freeways. The city is positioned amid some of Southern California’s most crucial transportation thoroughfares in road, rail and air travel, and is home to LA-Ontario International Airport, making Ontario a true transportation hub in Southern California. With employment nearly doubling in the past 10 years, Ontario is suited for some of the most exciting developments in the Inland Empire pipeline, including Guasti, a 50 acre mixed-use development located directly between Interstate ten and the Ontario International Airport.

Guasti  was once a self-sufficient community complete with a company store, bakery, fire station, hotel, post office and the world’s largest contiguous vineyard, encompassing more than 5000 acres. Home to the Guasti Mansion, the San Secondo d’Asti Catholic Church, Joseph Filippi Winery Tasting Room and Gift Shop, Saffron Catering and the Homestyle Café, Guasti is positioned to be a unique, planned community blending a proud history and an opportunistic future.

Guasti will offer two hundred thousand square feet of retail, restaurant and entertainment, 600,000 square feet of office, 400 residential units and two-three hotels. 175,000 square feet of existing historical stone winery buildings will be integrated into this rustic Inland Empire oasis.

GHD provided an array of services to assist with the implementation of this large and complex project:

  • Initial litigation support and investigation to refute exposure claims
  • Observation and clearance of tenant space related to litigation
  • Follow on survey of seventy structures encompassing one million square feet of building space
  • Observation services during the remediation and demolition of the structures
  • As-needed environmental services during infrastructure and ongoing construction



Our Environment team has earned a reputation for excellence by offering integrated, practical and innovative solutions to all levels of government, authorities and private organisations.

We draw on the skills of engineers, scientists, auditors and planners to deliver services in a number of critical areas:

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Project Management


GHD procedures and systems facilitate the coordination and control of all phases of project development – for small and large developments.

Our services span feasibility studies, concept planning and financial evaluation and design management. Our EPCM services include contracts administration, procurement, industrial relations, construction management and control of cost budgets, time schedules and quality assurance.

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