Confidential Brownfield Redevelopment

E Sciences supported SGF Environmental Consultants (SGF) on this Brownfield redevelopment project located in Fort Pierce, Florida. SGF conducted the initial Phase I and Phase II ESA of this hurricane damaged commercial property. The Phase I ESA identified that a former dry cleaner had operated on site. The Phase II ESA indicated that the historic dry cleaner operations had resulted in chlorinated solvent impacts in the groundwater.

The owner subsequently purchased the property with the intention of redeveloping it into a prototype hybrid Power/ Lifestyle Retail Center with plush landscaping, fountains, recreational and entertainment facilities. The City of Fort Pierce fully supported this project and acknowledged it as the beginning of redeveloping this area of the City. The site was designated as a Brownfield by the City of Fort Pierce in 2006. The SGF/E Sciences team represented the client at public and City Commission meetings to support the brownfields designation process.

On behalf of SGF, E Sciences team prepared a Site Assessment Report in less than four months. The assessment included innovative technologies such as a modified active gas soil survey, ColorTech screening, onsite mobile laboratory testing, direct push groundwater samples and microwells.

E Sciences attended regular design meetings and worked closely with the site development team to ensure that the environmental aspects of the project were coordinated with design and construction. For example, lift stations and drainage were designed to eliminate the need to dewater on the site and minimize exacerbation of the contaminant plume.

To establish soil remediation endpoints, we negotiated alternative site-specific cleanup target levels for perchloroethene. Those alternative standards were used to reduce the amount of source removal required. We conducted a pilot study to evaluate the effectiveness of both chemical and biological groundwater remediation for the Site. Based on the results of the pilot study, a Remedial Action Plan was prepared and approved by the FDEP. We selected a bioremediation technology designed to enhance the subsurface conditions for stimulating naturally occurring bacteria to break down the chlorinated solvents. E Sciences conducted injections in order to promote contaminant degradation and achieve regulatory cleanup criteria at the Site. E Sciences conducted periodic groundwater sampling activities in order to evaluate the degradation trends of the groundwater contamination at the site and monitor the contaminant plume as part of the remediation activities.

Upon completion of the remedial efforts, the groundwater contamination plume was significantly reduced and contaminant concentrations had generally decreased. Based on the cumulative data, E Sciences proposed to implement a more aggressive and targeted injection approach to alleviate the areas of persistent contamination. FDEP concurred with evaluation of the data and conceptual additional remedial approach.

This project was constrained by tight time frames from the beginning. Because FDEP assigned the “discharge discovery date” back to when the Phase II ESA was completed (which was several months prior to site acquisition and entering the voluntary cleanup agreement), our site assessment due date was five months less than the typical schedule requirement. We met this deadline with a full delineation of the groundwater contaminant plume.

A large part of the assessment and remediation time frames for this project had been driven by the proposed design or construction activities, as they have been more stringent than regulatory deadlines. In each case, we maintained our work ahead of the required schedule and met each regulatory deadline.

We integrated cost-savings measures into the assessment and remedial planning throughout the project. For example, the development of a site-specific alternative soil cleanup standard has saved the client thousands of dollars by significantly reducing the volume of soils removed for the source removal. Another example is the use of the Magnetometry Survey. This significantly reduced the number of discrete soil samples needed to provide a focused soil assessment. Reduced soil samples equates to less drilling, man-hour and laboratory costs for the project.