Representative Projects

Investigation and Remediation of Salt Plume from former Brining Plant

Investigation and Remediation of Salt Plume from former Brining Plant

A plume of sodium chloride from a former pickle plant had migrated off-site and contaminated over 20 drinking water wells. Ground Zero personnel worked with the State Attorney General’s office to design a remedial response that included closure of 9 acres of infiltration ponds, private well abandonments and development of an alternative water supply. Ground Zero has performed similar work at sites used for olive brining, hide curing and wine production.

 

Multi-party CERCLA Site

Multi-party CERCLA Site

Ground Zero served as the field and litigation consultant for a responsible party in a large Federal Superfund action involving contamination with chlorinated solvents and perchlorate from numerous industrial operators. The work involved characterization of site conditions and documentation of historical operations to support reduced liability, allocation analysis for settlement and resolution of vapor and soil contamination issues under state oversight.

 

 Expert Testimony in Colorado Manufactured Gas Plant Case

Expert Testimony in Colorado Manufactured Gas Plant Case

GZA evaluated the history of operations, fate/transport and release timing of a carbureted water gas tar plume from a turn-of-the-century gas plant threatening an adjacent river. Deposition and expert testimony in Federal Court focused on past disposal practices and the dynamics of coal tar movement in fractured rock. The expert analysis relied on historical maps, tar production records and tar properties based on feedstock and process history, in addition to evaluation of the current distribution of free phase tar (DNAPL) and dissolved tar constituents downgradient of the site.

 

Soil and Groundwater Cleanup for the Steinbeck Center in Salinas CA

Soil and Groundwater Cleanup for the Steinbeck Center in Salinas CA

Working with the City Redevelopment Agency, Ground Zero evaluated vapor intrusion issues and coordinated site remediation with  the site development and construction for this facility.

 Remedial  Action at Silicon Valley  Shopping  Center

Remedial  Action at Silicon Valley  Shopping  Center

GZA prepared the CERCLA compliant Remedial Action Plan and is implementing long term cleanup at this downtown center contaminated by releases from historical businesses. The remedial system consists of two vapor extraction systems removing a total of approximately 750 cubic feet per minute of soil gas from 24 wells. The work also includes tracking the efficacy of zero valent iron injections and a vegetable oil bio-barrier on the reductive dechlorination of halogenated VOCs as well as monitoring natural plume attenuation off-site.

 

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Investigation, Remediation and Litigation Related to Groundwater and Municipal Well Contamination from PCE released by Dry Cleaners

Ground Zero personnel have worked on dozens of cases involving PCE releases from dry cleaning operations which have contaminated soil and groundwater, impacted drinking water wells and resulted in vapor intrusion threats. We have served as the field consultant directing investigation and cleanup, as confidential litigation consultants assisting counsel on technical issues and as testifying experts. Within California this work has involved releases from multiple cleaners in the Cities of  Chico, Eureka, Fairfield, Lodi, Merced, Mill  Valley, Modesto, Napa, Sacramento, San Francisco, San Jose, Santa Barbara, Santa Rosa, Stockton, Sunnyvale, Turlock, and Watsonville.

 

westley ust drilling medium

Petroleum Hydrocarbons and Underground Storage Tank (UST) Sites

Ground Zero personnel have worked on hundreds of UST sites in the western United States involving tank removal, investigation and remediation.  Our work involving petroleum hydrocarbon contamination has included refineries, airports, bulk plants, pipelines, railways, marinas and mobile sources. As part of this work we have provided litigation support and expert testimony for dozens of cases involving contamination and insurance issues.

 

Superfund Pesticide Formulation/Application Site Remediation

Superfund Pesticide Formulation/Application Site Remediation

GZA completed all phases of investigation and remediation at a major fertilizer and pesticide formulation plant in the Central Valley to achieve Site Certification.  Specific documents included RI/FS, HHRA, RAW, RAP, RDIP and CEQA studies.  Final remedy adopted for the site was encapsulation and monitored natural attenuation with no requirement for continued active remediation.