Award Date

5-2-1998

Degree Type

Thesis

Number of Pages

54

Abstract

This Remediation Action Plan (RAP) presents the methods and results of feasibility testing, the screening and selection of remedial options, preliminary conceptual design, methods, permitting requirements, recommendations and cleanup goals for on- and off-site remediation of petroleum hydrocarbon impacted soil and groundwater at an undisclosed site in Laughlin, Nevada. This site is an active convenience store and former retail fueling station. Plans are being made for the demolition of the fueling station and construction of a Factory Outlet Mall on the former refueling station site and surrounding properties to the south, west, and northwest. Remediation activities cannot significantly interfere with the demolition and construction plans for the mall facility. A total of three underground storage tanks (USTs) have been removed along with approximately 453 tons of hydrocarbon contaminated soil which was transported to Las Vegas Paving Corporation for thermal treatment. A total of 24 exploratory soil borings were advanced during the on-site and off-site assessment. Nine soil borings were advanced on- and off-site, of which five were converted to groundwater monitoring wells.

Before the remedial action plan can be developed an evaluation of several activities must be assessed, such as, subsurface conditions in the vicinity of the removed USTs and feasibility testing, which is ultimately the primary basis in deciding the type of abatement which will take place.

This RAP discusses and evaluates the feasibility of various proposed soil and groundwater remediation alternatives. The selected remedial system incorporates soil ventilation, groundwater air sparging, and air emissions controls. Groundwater treatment will be by in-situ air sparging to enhance biodegradation and volatilization of dissolved contaminants. Volatile subsurface contaminants will be recovered through soil ventilation. Air emissions will be controlled by a thermal/catalytic oxidizer or carbon adsorption units as determined by concentrations of volatile organic compounds (VOCs) and cost factors. This remedial system has been selected based on site geology, utilities and structure, hydrogeologic conditions, contaminant transport, planned construction activities and economic considerations. Detailed discussion of the selection criteria and comparisons of alternatives will also be discussed in this report.

This research report is factual and as detailed as would be used by any remediation company to be submitted to the Nevada Petroleum Fund for evaluating the technical and economical considerations.

Language

English


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