ARCADIS/Malcolm Pirnie May 24, 2012

Transcription

1 Innovative Remedial Approaches to Accelerated Site Closure Karen Hohe Suchomel, PG Rula A. Deeb, PhD, BCEEM Scott T. Potter, PhD, PE Suthan S. Suthersan, PhD, PE ARCADIS/Malcolm Pirnie May 24, 2012

2 Performance Based Remediation: A Platform for Innovation and Accelerated Site Closure Reese Air Force Base, TX Innovation: Directed Groundwater Recirculation (DGR) Fort Gordon, GA Innovation: Green Remediation Lake City Army Ammunition Plant, MO Innovation: Regulatory plan for schedule acceleration Sierra Army Depot, CA Innovation: cost-effective management of MMRP impacts Environment, Energy Security & Sustainability Symposium & Exhibition

3 Former Reese Air Force Base, Texas 3 29 May ARCADIS

4 Project Overview Innovation Driver.TECHNICAL Reese AFB operated between 1941 and 1997 (BRAC closure): aircraft maintenance, vehicle maintenance, aircraft and equipment fueling, fire training, and solid waste disposal Performance objective: Fence to fence closure of all known and unknown environmental sites Contract administered by the USACE, Tulsa District Period of performance: Contract value: ~$43.5M

5 Technical Challenges 3-mile TCE plume in a sole source aquifer for surrounding community Restoration to MCLs Groundwater drives the local economy (potable use, farming, commercial, light industrial) Dozens of private wells and irrigation wells Extensive well network for site remediation (671 monitoring wells, 50 extraction wells, 60 injection wells) Aquifer heterogeneities Result: Final remedy operating for 5 years and still no OPS

6 The Tower Area TCE Plume 2004 Primary Sources Landfill

7 Technical Approach Revise the Conceptual Site Model Detected high permeability layers that control migration direction Using the new CSM as a foundation for remedy design Modify current system to demonstrate OPS Pump and treat required to avoid ROD modification Optimize current system to accelerate mass removal Stop plume growth Environment, Energy Security & Sustainability Symposium & Exhibition

8 Use of Optimization Tools 900 gpm Innovative software (MODALL), an add-on to MODFLOW, was used to optimize remedy 300 gpm Setting the stage to optimizing remedy approved in the ROD 300 gpm

9 Plume Management Approach Primary Sources Landfill 1

10 Directed Groundwater Recirculation

11 Plume Evolution

12 Reese Summary Overall Project Site Closure (SC) for 7 soil sites within 4 years of start Remediation (to MCLs) of groundwater plumes at Southwest Landfill and POL Area Tower Plume OPS designation TCE below 5 ppb, entering 3 year monitoring period for closure Plume shrinkage from 800 acres (2004) to 12 acres (July 2011) at an average rate of 2-3 acres/week Savings: ~$25M Schedule: Acceleration by 12 years Environment, Energy Security & Sustainability Symposium & Exhibition

13 Fort Gordon, Georgia May ARCADIS

14 Project Overview Innovation Driver.TECHNICAL Period of performance: 9/ /2015, with contract value of $19.5M Performance objectives: Close 26 SWMUs Landfills, former maintenance shops, waste storage and disposal areas, drainage structures, groundwater plumes Contaminants: Hydrocarbons, pesticides, mercury, chlorinated solvents Key technical challenge: SWMU 9 TCE plume with concentrations >1,000 ppb Plume is discharging to the adjacent stream Stream data demonstrate that surface water concentrations are ND No identified receptors; remote location Groundwater concentrations are attenuating

15 Technical Challenges Remedy Objectives Address the Georgia Environmental Protection Division guidelines to have an active remedy Result in minimal site impacts to protect an endangered species (Red Cockaded Woodpecker) Needs to be low maintenance because of the remoteness of the site and there is no access to power or utilities Meet GA stream water quality standards (32 ppb)

16 The Result: Artesian Treatment Vessels (ATVs) Sustainability by design ARCADIS balanced the overall treatment objectives and the ecosystem considerations to develop a sustainable, cost-effective remediation strategy with the collaboration with all stakeholders involved The ATV Remedy takes advantage of ambient artesian conditions that cause impacted groundwater to flow through the ATVs, removing all VOCs Environment, Energy Security & Sustainability Symposium & Exhibition

17 5 ATVs for Plume Capture TREATMENT WELL

18 ATV Operation Environment, Energy Security & Sustainability Symposium & Exhibition

19 Operating ATVs Summer 2011

20 Fort Gordon Summary Developed and implemented an innovative green remedy that uses natural artesian conditions, does not require an external energy source and needs very little maintenance Operating continuously at 8.5 gpm (100% uptime) GAC life-cycle is 5 to 7 years Removes approximately 5.1 lbs of TCE/year Will reduce life cycle CO 2 emissions by an 60 tons (analysis using ARCADIS BalancE3 Tool to compare alternatives) Improved relationship between the Army and GAEPD Environment, Energy Security & Sustainability Symposium & Exhibition

21 Lake City Army Ammunition Plant, MO May ARCADIS

22 Project Overview Innovation Driver.SCHEDULE Active ongoing mission-critical CERCLA site with 4 OUs and 33 AOCs Nature and extent of contamination Abandoned disposal pits, sumps, firing ranges, old lagoons and dumps, closed RCRA lagoons, burning grounds Large chlorinated solvent plumes with NAPLs and mixed liquid wastes Impacts to a prolific drinking water aquifer Contract objective: RIP/RC/NFA by 2007 Period of performance: ; contract value: ~$52.5M

23 Performance Based Contract Drives Schedule Multiple teams mobilized from across the country Numerous meetings with regulators Obtain buy in for combined reports Present concept for site-wide groundwater approach Present findings before they were included in a draft report Address questions/concerns before they had a chance to slow progress Community Meetings Introduce technical concepts Environment, Energy Security & Sustainability Symposium & Exhibition

24 Technical Approach Innovative approaches to rapidly treat two NAPL source areas NECOU: Zero-valent iron (ZVI)/clay soil mixing treatment, with enhanced reductive dechlorination and MNA Reduced mass flux from the source by decreasing effective hydraulic conductivity Passive technology, limiting life-cycle costs and net environmental impact Destroys chlorinated ethenes, providing permanent treatment Area 18: In-situ bioremediation in DNAPL source zone

25 Green Remediation Seven mobile solar-powered systems to recover NAPL Phytoremediation used to manage hydraulics related to underperforming PRB Reuse of extracted groundwater for elements of final remedy Minimizing waste generation (e.g., on-site soil treatment, passive groundwater sampling devices) Environment, Energy Security & Sustainability Symposium & Exhibition

26 Lake City AAP Summary Met aggressive cost and schedule goals (RIP/RC/NFA within 4 years) under challenging regulatory constraints NFA designations at 25 AOCs Implemented comprehensive groundwater strategy Five-year review (2011) determined remedy is protective of human health and environment Estimated savings: $20M Winner: 2011 AAEE (American Association of Environmental Engineers) Excellence in Environmental Engineering Award, Design Category Environment, Energy Security & Sustainability Symposium & Exhibition

27 Sierra Army Depot, California May ARCADIS

28 Project Overview Innovation Driver.COST and REGULATORY Performance objective: Achieve RC for 8 MMRP Sites Area with numerous white phosphorus (WP) rounds Possible UXO in debris piles Metals exceedances in shallow soil samples Elevated arsenic levels in site groundwater wells Period of performance: January 2010 through December 2012 Costs for anticipated remediation : $12M characterization through RC >$100M estimates for MEC removal remedies

29 Sierra Army Depot: 8 MMRP Sites BLM- Administered Public Land UBG

30 Regulatory Interaction Relationship developed over 7 years of executing remediation at IRP sites Numerous meetings and site visit with regulators. Agreements included: Appropriateness of LUCs remove sites from active Army and public use Scope to ensure protectiveness Accelerated schedule Environment, Energy Security & Sustainability Symposium & Exhibition Agreements allowed execution of RA work during RI field work to accelerate schedule and minimize mobilization costs

31 Technical Approach Complete RI to address regulatory concerns about UXO/MEC and MC 100% surface sweeps for MEC characterization Focused media sampling Soil sampling to assess exposure risk and risk of leaching to groundwater Subsurface soil sampling adjacent/beneath buried trenches Installed 2 new monitoring wells GW evaluation Complete RA field work during RI to meet time constraint BIP MEC encountered Fence repair/installation and warning sign installation

32 Sierra Army Depot Summary Regulatory agency concurred with NFA recommendation for one site and had only one comment on the 7 Sites Draft RI/FS Report In August 2011, regulatory agency concurred with the selected LUCs remedy for the 7 other sites On track to achieve RC in 3Q2012 (within two years of contract award) with completion of a 7 Sites ROD Total contract value: $6.9M order of magnitude savings Environment, Energy Security & Sustainability Symposium & Exhibition

33 Overall Conclusion: Necessity Drives Innovation Performance-based remediation is a platform for developing innovative approaches to accelerate closure and meet contract objectives Contractor accountability Lessons-learned process is therefore critical at ARCADIS, captured by our Technical Knowledge and Innovation (TKI) group. Performance-based contracting maintains the focus on closing sites and minimizing life-cycle costs Environment, Energy Security & Sustainability Symposium & Exhibition

34 Imagine the result QUESTIONS??? Karen Hohe Suchomel Associate Vice President, Guaranteed Outcomes Contact Info: 34