Per- and polyfluoroalkyl substances (PFAS) contamination impacts the drinking water of more than 200 million people in the US. Scientists are just now understanding how to effectively characterize and remediate this class of emerging contaminant in groundwater. Hargis’ engineers and hydrogeologists are on the leading edge of PFAS investigation and remediation with recent work on …
Tetrachloroethylene (PCE) was detected at levels exceeding regulatory screening levels in the first sampling event, but significantly lower during the second. The variability seen in the initial grab and integrated sampling events suggested something more complex than vapor intrusion alone. Continuous indoor air sampling was beneficial in identifying and effectively remediating the contributing sources resulting …
Continuous Air Sampling for Tetrachloroethylene Vapor Intrusion Investigation Read More »
This California site had recycled spent industrial solvents and waste oils for the reclamation process. The property was designated a California State Superfund Site in 1984. Initial site investigations performed by a contractor for the California Department of Toxic Substances Control (DTSC) found the soil had been impacted by chlorinated solvents, heavy metals, and polychlorinated …
This manufacturing facility began operating a new chemical manufacturing plant in Nevada in 1947. The plant was constructed on land leased within a portion of an industrial complex. The plant specialized in the production of a variety of chemicals including chlorinating benzene for use elsewhere. All operations ceased at the plant in 1983 and the plant …
Hargis has worked with the Arizona Department of Environmental Quality (ADEQ) on various projects to investigate and remediate per- and polyfluoroalkyl substances (PFAS) in the Tucson area including: Central Tucson PFAS Project: Hargis is assisting ADEQ in protecting the Tucson Central well field by investigating the nature and extent of PFAS contamination in the regional aquifer …
Central Tucson Per & Polyfluoroalkyl Substances Project Read More »
Initial site investigations for this former southern California manufacturing site found soil and groundwater had been impacted by Volatile Organic Compounds (VOCs). The former facility was used for the development, manufacture, and assembly of electronic components, with historical releases of chlorinated solvents that impacted localized areas of soil and groundwater. Clean-up of this 14-acre site …
This former manufacturing facility was used for design, testing, and manufacturing of electronic medical testing equipment. Sampling of soil, soil gas and groundwater revealed the presence of Polychlorinated Biphenyls, (PCBs) and volatile organic compounds (VOCs) including tetrachloroethylene (PCE), 1,1-dichloroethylene (DCE), 1,1,1-trichloroethane (TCA), and 1,1-dichloroethane (DCA). Site remediation is overseen by the United States Environmental Protection …
Hargis + Associates, Inc. was retained by the owners of a former aerospace manufacturing facility to provide operations and maintenance (O&M) oversight for an existing remediation system in Los Angeles County, CA. The soil and groundwater at the site were impacted with volatile organic compounds (VOCs), including trichloroethylene, tetrachloroethylene, and methylene chloride, and the semi-volatile …
Remediation System Upgrade for Improved Mass Recovery Read More »
Environmental investigations and remediation on Native lands requires a unique set of qualifications: environmental experts who understand how to navigate the complexity of environmental regulation and jurisdiction, consider cultural sensitivities and mitigate adverse impacts to cultural values and environmental resources, maintain stakeholder engagement, and promote environmental justice. A Native American tribe retained Hargis as its …
Beckman Instruments, Inc. operated an electronic instruments manufacturing facility in Porterville, California. The facility utilized a solar evaporation pond for the temporary storage of liquids. Initial site investigations revealed the presence of chlorinated solvents in a shallow groundwater system in the vicinity of pond. 1,1,1-Trichloroethane, trichloroethylene, Freon 113, 1,1-dichloroethylene, and 1,1-dichloroethane were detected in groundwater …
