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Scientific Investigations Report 2011–5003

Prepared in cooperation with the U.S. Navy

Mass of Chlorinated Volatile Organic Compounds Removed by Pump-and-Treat, Naval Air Warfare Center, West Trenton, New Jersey, 1996–2010

By Pierre J. Lacombe

ABSTRACT

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Pump and Treat (P&T) remediation is the primary technique used to contain and remove trichloroethylene (TCE) and its degradation products cis 1-2,dichloroethylene (cDCE) and vinyl chloride (VC) from groundwater at the Naval Air Warfare Center (NAWC), West Trenton, NJ. Three methods were used to determine the masses of TCE, cDCE, and VC removed from groundwater by the P&T system since it became fully operational in 1996. Method 1, is based on the flow volume and concentrations of TCE, cDCE, and VC in groundwater that entered the P&T building as influent. Method 2 is based on withdrawal volume from each active recovery well and the concentrations of TCE, cDCE, and VC in the water samples from each well. Method 3 compares the maximum monthly amount of TCE, cDCE, and VC from Method 1 and Method 2. The greater of the two values is selected to represent the masses of TCE, cDCE and VC removed from groundwater each month.

Previously published P&T monthly reports used Method 1 to determine the mass of TCE, cDCE, and VC removed. The reports state that 8,666 pounds (lbs) of TCE, 13,689 lbs of cDCE, and 2,455 lbs of VC were removed by the P&T system during 1996–2010. By using Method 2, the mass removed was determined to be 8,985 lbs of TCE, 17,801 lbs of cDCE, and 3,056 lbs of VC removed, and Method 3, resulted in 10,602 lbs of TCE, 21,029 lbs of cDCE, and 3,496 lbs of VC removed. To determine the mass of original TCE removed from groundwater, the individual masses of TCE, cDCE, and VC (determined using Methods 1, 2, and 3) were converted to numbers of moles, summed, and converted to pounds of original TCE. By using the molar conversion the mass of original TCE removed from groundwater by Methods 1, 2, and 3 was 32,381 lbs, 39,535 lbs, and 46,452 lbs, respectively, during 1996–2010.

P&T monthly reports state that 24,805 lbs of summed TCE, cDCE, and VC were removed from groundwater. The simple summing method underestimates the mass of original TCE removed by the P&T system.

First posted April 25, 2011

  • Table 2 XLS (627 KB)
    Table 2 of this report is provided in electronic format as an Excel 97 workbook.
    [right-click link to download and save file]

For additional information contact:
Director, New Jersey Water Science Center
U.S. Geological Survey
810 Bear Tavern Rd., Ste 206
West Trenton, NJ 08628
http://nj.usgs.gov/

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Suggested citation:

Lacombe, P.J., 2011, Mass of chlorinated volatile organic compounds removed by Pump-and-Treat, Naval Air Warfare Center, West Trenton, New Jersey, 1996–2010: U.S. Geological Survey Scientific Investigations Report 2011–5003, 48 p.



Contents

Acknowledgments

Abstract

Introduction

Purpose and Scope

Previous Investigations

Three Methods of Determining Mass of CVOC Removed

Results of Method 1: Removal Based on Influent to the Pump and Treat Building

Mass of TCE, cDCE, and VC Removed

Mass of Original TCE Removed

Results of Method 2: Removal Based on Withdrawals from the Recovery Wells

Pumping and Withdrawals Rates for Nine Recovery Wells

TCE, cDCE, and VC Concentrations in Water Samples from Nine Recovery Wells

Mass of TCE, cDCE, and VC Removed

Individual Recovery Wells

All Recovery Wells

Mass of Original TCE Removed

Results of Method 3: Removal Based on Maximum of Methods 1 and 2

Discussion of Difference in Masses Based on Methods

Summary and Conclusions

References Cited


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