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Parsons Engineering Science, Inc. (Parsons ES), formerly Engineering-Science, Inc. (ES), was retained by the United States (US) Air Force Center for Environmental Excellence (AFCEE) to prepare an engineering evaluation/cost analysis (EE/CA) in support of a risk-based remediation decision for soil and groundwater contaminated with fuel hydrocarbons at Pumphouse #2, a former fuel storage and pumping facility at Malmstrom Air Force Base (AFB), in Great Falls, Montana (the Base). Risk-based remediation is designed to combine natural physical, chemical, and biological processes with low-cost source removal technologies such as in situ bioventing, as necessary, to economically reduce potential risks posed by subsurface petroleum fuel spills. A decision diagram for the risk-based process is shown in Figure 1.1.
This work plan was prepared by Engineering-Science, Inc. (ES) and describes the scope of work required for the collection and analysis of data to complete an engineering evaluation/cost analysis (BE/CA) in support of a risk-based remediation decision for soil and ground water contaminated with JP-4 fuel hydrocarbons at Site STl4 at Carswell Air Force Base (AFB), Fort Worth, Texas. Site STl4 consists of two separate sites: Site STl4A, the Fuel Loading Area, and Site STl4B, the petroleum, oil, and lubricant (POL) tank farm. This work plan is the equivalent of a treatability study test design (TSTD) for the field test of the risk-based approach for the remediation of Site ST 14. This innovative technology demonstration is sponsored by the Air Force Center for Environmental Excellence (AFCEE) at Brooks AFB, Texas, under contract F41624-93-C-8044, "Risk-Based Approach to Fuel Spill Remediation." The Site STl4 demonstration is a component of a multi-site initiative being sponsored by AFCEE to demonstrate how quantitative fate and transport calculations and risk information based on site-specific data can be integrated to quickly determine the type and magnitude of remedial action required at a site to minimize contaminant migration and receptor risks.
As part of the EE/CA, the Bioplume II modeling effort has three primary objectives: (1) to predict the future extent and concentration of the dissolved-phase contaminant plume by modeling the effects of advection, dispersion, sorption, and biodegradation; (2) to assess the possible risk to potential downgradient receptors; and (3) to provide technical support for selection of the intrinsic remediation option as the best remedial alternative at regulatory negotiations, as appropriate. The Bioplume II modeling effort for this site will involve completion of several tasks, which are described in the following sections.
This work plan, prepared by Engineering-Science, Inc. (ES), presents the scope of work required for the collection of data necessary to conduct an engineering evaluation/cost analysis (EE/CA) for remediation of groundwater contaminated with JP-4 jet fuel at fuel pumping station 950 at site SS27/XYZ located at Dover Air Force Base (AFB), Delaware. Several remedial options will be evaluated during the EE/CA, including free product removal; groundwater extraction, treatment, and reinjection (i.e., pump and treat); air sparging; and natural contaminant attenuation (intrinsic remediation) with long-term monitoring. All hydrogeologic and groundwater chemical data necessary to evaluate the various remedial options will be collected under this program; however, this work plan is oriented toward the collection of hydrogeologic data to be used as input into the Bioplume groundwater model in support of intrinsic remediation for restoration of fuel-hydrocarbon-contaminated groundwater.