§Identification and Disposal of Asbestos Containing Materials
§Site Restoration
PROJECT SUMMARY
The Archer’s Service Station site is located at 180 East Main Street, Lake Butler, Florida.It was a service station with an active automobile repair facility.When Fortis acquired tasked with this project, some assessment but no remediation activities had been conducted.Fortis reviewed all existing site documentation and conducted additional assessment activities (soil and groundwater sampling, monitor well installation) based on the previous data. Free phase petroleum product was present in site monitor wells, dissolved phase contamination was present in both the surficial and intermediate aquifers beneath the site, and extensive soil contamination was present.Fortis recommended conducting source removal activities and FDEP concurred.
The design for the source removal included the demolition of existing site structures in order to fully access site contaminants.Florida Department of Environmental Protection, the regulatory and funding agency, requested verificationthat demolition and excavation was truly the most cost effective solution, and Fortis provided a comparison estimate for several solutions (in-situ treatments versus excavation).The comparison estimate continued to support demolition and excavation and, after completing two additional independent cost estimates, FDEP concurred.
Site activities began with an asbestos survey as required by the National Emissions for Hazardous Air Pollutants (NESHAP) regulations.The survey results indicated that asbestos-containing floor tiles were present in the building.No other asbestos containing materials were identified and Fortis personnel supervised the removal and disposal of approximately 400 square feet of tile flooring.
Prior to beginning demolition and source removal activities, all utilities to the building were cut and utility locates were ordered.Once utility lock-outs were verified, Fortis personnel supervised the demolition and removal of the building, canopy and concrete paving.In addition, Fortis personnel supervised the pressure grouting of monitor wells within the proposed limits of excavation.Waste characterization samples were collected from the excavation area; and the results along with a waste profile were submitted to the disposal facility for approval. Once the demolition activities were completed, Fortis personnel supervised a Tri-Con (Fortis’ sister company) construction crew during the installation of an LDA stabilization wall.This wall provided support and ensured the integrity of Highway 100 and the video rental store building foundation during excavation activities.The stabilization wall was constructed by installing 50 linear feet of LDA borings along Highway 100 and 65 linear feet of borings along the west face of the video rental store building.Once an auger boring was installed, the boring was backfilled using flowable fill and the subsequent boring was staggered to allow the cement to stabilize.Petroleum contaminated soil removed during the LDA wall installation was stockpiled prior to being loaded and transported to the disposal facility. Simultaneous to the stabilization wall installation, Fortis personnel supervised conventional excavation activities in a different area of the proposed excavation.The excavation was conducted in phases to minimize the need to dewater due to rain events or groundwater infiltration.Soil was briefly stockpiled to prevent demurrage and then direct loaded to trucks for transport.A total of 9,952 tonsof petroleum contaminated soil and 13 storage tanks were removed from the site during source removal activities.The excavation areas were backfilled, compacted, and restored with reinforced concrete. The site is now in post remediation monitoring.The abandoned monitor wells were replaced and the first of four quarters of monitoring began in January 2008.Although initial monitoring results exceeded natural attenuation default concentrations, contaminant levels have dropped significantly during the first three quarters of monitoring.As of July 2008, all contaminant concentrations were below natural attenuation default concentrations and natural attenuation monitoring a five year period was approved.
Building Demolition
Debris Removal
Conventional Excavation
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