The Johnson & Johnson #6 facility (Site) is located in Lee, Madison County, Florida.This site currently operates as a convenience store that vends fuel from above ground storage tanks.After evaluating the existing data and collecting limited additional data, Fortis initially recommended a conventional source removal.After reviewing our client’s needs, however, it became evident that excavation could negatively impact our client’s business.Fortis’ engineers then completed an innovative design that met both the State cleanup requirements and did not impact the active business.
The remediation implementation activities consisted of limited excavation of the petroleum source contamination in the vicinity of the dispenser islands and storage tanks.The source removal was conducted using large diameter auger (LDA) borings and conducted as part of the installation of the PBTP network.The PBTP network is an innovative design that combines remedial technologies to ensure site cleanup.
The PBTP cells were spread across the site, perpendicular to groundwater flow and coinciding with previously identified soil contamination.LDA was utilized to excavate each PBTP to 55 feet below land surface and the excavated soil was characterized and disposed off site.The PBTP was then constructed in the open LDA boring.Each PBTP cell consists of two to three chambers filled with # 57 stone.The chambers are segregated with seals and PVC wells were placed in each chamber.The individual chambers in each PBTP cell were designated for use as vapor extraction cells, groundwater extraction wells, or injection zones for oxidizing agent; thus each PBTP could be used for as many as three different remedial technologies. Once installation was complete, the in-situ remediation activities were implemented.The shallow PBTP chambers were designed for vapor extraction (VE) via active extraction or using barometric “pumping”.Central and select deep PBTP chambers were utilized for the injection of calcium peroxide.The location of each chamber and the high transmissivity of the chamber constructionallowed the groundwater to preferentially flow toward and through the PBTP cells.Finally, the remaining deep chambers can be utilized for either injections or groundwater extraction. Currently, two injection and soil vapor extractiion events have been completed.Groundwater sampling results continue to show decreasing contaminant trends in all shallow monitor wells.
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