Wednesday, 8 May 2013
Contaminated site remediation professionals will gather at the Florida Remediation Conference in Fort Lauderdale to discuss soil and groundwater cleanup efforts in Southern Florida. On Thursday, May 9th, Drew Baird, East Region Manager for REGENESIS, will give an insightful platform presentation on Post-Active Remediation Monitoring (PARM). The formal title of the talk is Can we PARM Yet? Groundwater Quality after Remediation at Multiple Sites in Florida.
In-situ chemical oxidation (ISCO) and enhanced aerobic bioremediation (EAB) are proven, cost-effective, and widely-applied methods for contaminant mass depletion, plume stabilization, and site closure. A common challenge on projects where ISCO and EAB have been employed is the transition from active remediation to Post-Active Remediation Monitoring (PARM), as entry into PARM can be delayed due to Florida DEP guidance on groundwater monitoring. Various monitoring parameters (DO, ORP, pH, among others) are important for determining the distribution and/or longevity of ISCO and EAB amendments and are therefore critical interpreting treatment performance. Other parameters (TDS and other inorganics) may be indicators of distribution but more often measure the effects of the applied chemicals on groundwater quality, and many have state/federal limits in drinking water. There is some overlap between remediation performance parameters and groundwater quality parameters, but current Florida DEP guidance does not differentiate between remediation performance parameters and ground water quality parameters. The lack of differentiation directly affects transition into PARM. This presentation will evaluate groundwater quality data from sites where ISCO and/or EAB have been employed to treat PHCs in Florida and to clarify the role of various constituents in ISCO/EAB processes. Site examples include a former roadside spill in Broward County, Citrus County, and Miami-Dade County. At all three sites, entry into PARM was delayed due to the presence of various parameters that have little, if any, bearing on active remediation. Many of these parameters are indicators of residual presence of injected fluids but do not indicate that the active components – i.e., those product constituents responsible for hydrocarbon treatment – remained within the Zone of Discharge.
For more information on this presentation, Drew Baird can be reached at firstname.lastname@example.org and for info on the Florida Remediation Conference, please visit http://www.enviro-net.com/documents/frcsouth2013-reginfo.pdf
Wednesday, 19 October 2011
Contributed by Drew Baird, PG, Atlantic Region Manager, REGENESIS
Regenesis attended the 17th annual Florida Remediation Conference last week in Orlando along with approximately 450 other participants. There were 20 platform presentations given at the event, and a common thread among many of the talks was integrated remediation – leveraging the benefits of multiple technologies toward achieving site cleanup goals. Notable examples included presentations by Handex Consulting & Remediation (HCR) and Black & Veatch. Tim Harmon, PE with HCR presented on a multi-technology approach to a tanker spill – actually, 2 separate tanker spills on the same site over a 2½-year period – along the Florida Turnpike. In addition to excavation and dual-phase extraction, HCR used RegenOx® and ORC Advanced® for an effective ISCO-bio treatment that demonstrated rapid, 10x contaminant reductions soon after application and a significant reduction in the plume footprint. The HCR analysis included an insightful carbon footprint analysis of several technologies. Cal Butler, PG and Ernie Mott-Smith, PE from Black & Veatch tag-teamed a presentation on a naphthalene cleanup project in Pensacola that effectively demonstrated that aerobic bioremediation is capable of treating high contaminant concentration levels of over 15 mg/L naphthalene. The Black & Veatch team used multiple lines of evidence – geochemistry, molecular biological tools, and contaminant concentrations – to verify performance during the biosparging project, which employed horizontal directional drilling for sparge well installation.
Speaking of multiple lines of evidence, David Riotte, PE and Rachel Klinger, EI of Geosyntec presented an interesting study in vapor-phase transport of PCE at a dry cleaner site in Tallahassee. The study demonstrated that “vapor extrusion” from the dry cleaner contributed to vadose zone contamination beneath the facility. One of the themes of the talk was how conceptual site models often evolve during remediation projects as new information becomes available. Geosyntec presented on this theme during last year’s conference, and the clear take-home message is that project managers and site owners should build flexibility into site remediation plans to account for the evolving picture of the site as remediation proceeds.
Probably the best-attended session of the conference featured two new appointees at the Florida Department of Environmental Protection. Jorge Caspary, PG is the new Director of the Division of Waste Management, and Robert Brown, PE is the new Chief for the Bureau of Petroleum Storage Systems (BPSS). The Q&A session covered several topics, including risk-based closure standards, performance-based contracting for site remediation, long-term natural attenuation monitoring for low risk sites, institutional controls and deed restrictions, among other items. With respect to vapor intrusion, BPSS currently has draft guidance available, but further development of final guidance at BPSS or other Waste Cleanup program sites will be tabled until US EPA OSWER issues final vapor intrusion guidance, which is expected in 2012.
Another successful Florida Remediation Conference goes in the books. Next up – the Florida Brownfields Association 14th Annual Conference in downtown Orlando on November 13-16. Look for a recap after the event.
In the meantime, please leave your comments below!