EXHIBIT 4 - LIST OF CERTIFIED FIRMS.pdf

EXHIBIT 4 - LIST OF CERTIFIED FIRMS is a roster document that identifies pre-qualified environmental service providers available for hazardous waste management and related services. The document lists four certified firms approved to provide environmental services, hazardous waste collection, management, and disposal services. The certified vendors include Black Gold Industries, Western Environmental Services, O.C. Vacuum, Inc. (operating as O.C. Vacuum Environmental Services), and DNG Environmental, LLC. Each firm is documented with its classification of work type, physical business address, primary contact personnel, telephone number, and email address for procurement purposes.

The firms listed represent a range of service capabilities within hazardous waste management, from transportation and collection to comprehensive management and disposal operations. Black Gold Industries is located in Oxnard, California and specializes in hazardous waste transport services. Western Environmental Services, based in Glendora, California, provides hazardous waste management and disposal services. O.C. Vacuum, Inc., headquartered in Santa Fe Springs, California, offers hazardous waste collection services. DNG Environmental, LLC, located in Chula Vista, California, also specializes in hazardous waste collection. This certified firm roster appears designed to facilitate competitive procurement while ensuring all selected vendors meet established qualifications for environmental and hazardous waste services.