A waste management company has operated an active hazardous waste treatment, storage, and handling facility in California since 1973, where soil and groundwater contamination was discovered in 1983. Since 1990, the facility has operated remediation systems to contain and remediate soil and groundwater contamination. Four groundwater recovery wells located in three gravel-filled trenches and five off-site extraction wells are currently operating at the site. In 1998, 1,4-dioxane was detected in groundwater beyond the extent of the off-site recovery system. As such, additional investigations were conducted to characterize the downgradient extent of the contamination.

Cameron-Cole has designed and implemented additional remedial systems to contain and remove 1,4-dioxane contamination from downgradient portions of the site. This work is being conducted in accordance with a Site Cleanup Order (the Order) issued by the Regional Water Quality Control Board (RWQCB). In 2009 Cameron-Cole installed an In Situ Bioreactor (ISBR) system using bioaugmented microbes from the Louisiana State University Microbiology Lab, which was expanded in 2013, to remediate elevated concentrations of Volatile Organic Compounds (VOCs) and 1,4-dioxane in the source area. Groundwater sampling results have indicated that the ISBR system is effectively degrading the VOCs and an expansion of the system is planned. Cameron-Cole is responsible for the implementation of monitoring and reporting activities designed to comply with the requirements of the Order. Specific responsibilities include evaluation of daily remediation system operational data, collection of quarterly and semiannual groundwater samples from the extraction wells and selected site monitoring wells, and preparation and submittal of technical reports documenting these activities. Cameron-Cole oversees and supports the maintenance of the groundwater extraction and ISBR systems.