With approval from the Governing Board, the South Florida Water Management District implemented an innovative plan to deliver needed fresh water to Florida Bay. This is an immediate first step to help reduce salinity levels in the bay and promote the recovery of seagrasses killed during a severe drought in 2015, providing critical relief.
The South Florida Water Management District is working to improve undesirable resource conditions in Taylor Slough while maintaining flood mitigation within the C-111 basin. KEMRON was awarded the Taylor Slough/L-31W Levee and Plug Project during the fall of 2016. The project site encompasses approximately 600 acres. The scope of the Taylor Slough/L-31W Levee and Plugs Project is to construct ten (10) earthen plugs at various locations along the L-31W canal, construct a seepage barrier in the S-332D Pump Station Drainage Basin, and modify the gap in the L-31W levee to reduce its width to 500 feet and create a weir at an elevation of + 2 feet.
KEMRON was tasked by the USEPA to respond to a contaminated site in Memphis, TN. The Former Custom Cleaners (FCC) site operated as a laundry or dry cleaner from approximately 1950 until the mid-1990s. In 2013, the Tennessee Department of Environment and Conservation (TDEC) conducted investigation activities that indicated tetrachloroethylene, also known as perchloroethylene (PCE), was used during Custom Cleaners tenure at the site. In March 2015, the EPA supported TDEC Site Inspection (SI) sampling activities at the FCC site that included the collection of subsurface soil samples, soil gas samples, and groundwater samples. Analytical results for samples collected during the Site Investigation indicated the presence of a PCE source.
KEMRON demolished the existing building to allow access to the contaminated soil beneath the structure and surrounding pavement. KEMRON demolished the structure and all concrete paving in the area resulting in 23 truckloads of debris taken to a local subtitle D Landfill for disposal. KEMRON then excavated PCE contaminated soil and staged the material on site in 500 yard piles.
The Applied Technology Group of KEMRON Environmental Services, Inc. (KEMRON) conducted a dewatering laboratory bench scale study on impacted sediment from a river site located in the Boston, Massachusetts area. The purpose of the dewatering study was to evaluate dewatering techniques in order to increase the material percent solids and density for potential disposal. Four site sediments were evaluated during the bench scale study. The sediments showed a variation in particle size distribution from coarse sand to silt and was impacted with Hexavalent Chromium. KEMRON evaluated the effectiveness on the site materials for three different dewatering techniques including Recessed Plate Simulations through the use of Baroid filter press testing, Belt Filter dewatering using a Crown® Belt Filter Press, and GeoTube® dewatering through the use of the GeoTube® Rapid Dewatering Technique (RDT). The study included polymer evaluations as well as evaluating the dewatering technology on the “as received” material and material screened through a #200 sieve (de-sanded).
KEMRON’s Applied Technologies Group performed an ex-situ thermal remediation bench scale treatability study on soil which was impacted with compost impacted with Perfluorinated compounds (PFCs). Common PFCs include perfluorooctanoic acid (PFOA), used to make fluoropolymers such as Teflon, among other applications; or perfluorooctanesulfonic acid (PFOS), used in the semiconductor industry, 3M’s former Scotchgard formulation, and 3M’s former fire-fighting foam mixture; or perfluorononanoic acid (PFNA), used as surfactant in the emulsion polymerization of fluoropolymers; or perfluorobutanesulfonic acid (PFBS), used as a replacement for PFOS in 3M’s reformulated Scotchgard; or perfluorooctanesulfonyl fluoride (POSF), used to make PFOS-based compounds; or perfluorooctanesulfonamide (PFOSA), formerly used in 3M’s Scotchgard formulation; and FC-75, a 3M Fluorinert liquid; and perfluorinated cyclic ether (PFCE).
The treatability study was performed to determine the treatment temperatures potentially capable for thermal destruction of PFCs in highly organic soil at the site. The site test material consisted of highly organic soil which had been composted at different decomposing time intervals. Four candidate site materials with decomposition times of 3, 6, 12, and 18 months were subjected to thermal treatment performed at three target temperatures and one retention time. The materials in the study were initially heated to 100 Celsius to completely remove all moisture prior to subjecting the material to the target temperatures of 200, 398, and 1,100 degrees Celsius. Treatment durations were approximately 15 minutes at the target treatment temperature. Throughout treatments KEMRON performed constant temperature monitoring of the soil. All vapors were passed through an activated carbon off-gas treatment prior to releasing into the atmosphere.
KEMRON was not provided with the results of PFC analyses conducted on the treated test materials. However, discussions with the client indicated that treatment temperatures in excess of 1,000C showed successful reductions in total PFC concentrations.
Through our Worldwide Environmental Remediation Services (WERS) contract with USACE-Huntsville, KEMRON was contracted by USACE-Alaska to perform excavation, packaging, transportation and disposal of approximately 33,000 tons of PCB-contaminated soil from the White Alice Radio Relay Station (RRS) in Port Heiden, AK. The work was performed for the benefit of US Air Force, who is responsible for the environmental cleanup of the White Alice RRS. Alaska Department of Environmental Conservation (ADEC) provided regulatory oversight of the work of the CERCLA non-time critical removal action.
Since work at the remote area of Alaska is performed only during the warm summer months of May through September, KEMRON and Jacobs, our team subcontractor, coordinately closely with the native village officials and the local construction subcontractor, Aniakchak Contractors LLC. Close coordination with the community is maintained to ensure adequate housing and meals for field workers and availability of the limited labor pool and heavy equipment at Port Heiden during the limited field season.