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KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

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SECTION 2<br />

previous sampling results, and the effectiveness of the SVE system was indicated. LNAPL was not<br />

detected in samples collected from any of the newly installed wells.<br />

2.4.3 Identification of Contaminants of Potential Concern<br />

Petroleum contamination associated with the BFF has been identified in subsurface soils, soil gas, and<br />

groundwater. Contamination appears to be a result of various releases that have occurred over the<br />

operational history of the facility. Information is available on some of the releases whereas other releases<br />

are not well documented and are inferred to have been ongoing for unknown periods of time. All<br />

contaminants of potential concern (COPC) at the BFF are constituents of refined petroleum products and<br />

include, but are not limited to, the following: benzene, toluene, ethylbenzene, xylenes, EDB, and lead.<br />

Soil data collected during the BFF investigations are compared to the NMED’s TPH Screening<br />

Guidelines (October 2006; see Appendix A) to aid in defining the extent of contamination. The petroleum<br />

product subgroup containing kerosene and jet fuel was selected as applicable for the BFF site. The TPH<br />

toxicity for jet fuel is based on the weighted sum of the toxicity of the hydrocarbon fractions, which is<br />

reported as 30 percent for C11-C22 aromatics and 70 percent for C9-C18 aliphatics (Table 1,<br />

Appendix A). Based on this assumed composition, the documented TPH screening guideline for potable<br />

water industrial direct exposure for jet fuel is 1,810 milligrams per kilogram (mg/kg) (Table 2a,<br />

Appendix A). The TPH screening guideline for vapor migration and inhalation of groundwater industrial<br />

direct exposure is 2,350 mg/kg (Table 2b, Appendix A).<br />

Compound-specific groundwater maximum contaminant levels (MCLs), developed for the protection of<br />

human health, are presented in the New Mexico Administrative Code, Title 20 - Environmental<br />

Protection, Chapter 6 Water Quality, Part 2 - Ground and Surface Water Protection.<br />

MCLs for compounds petroleum-related compounds are as follows:<br />

• Benzene 0.01 mg/l<br />

• Toluene 0.75 mg/l<br />

• Ethylbenzene 0.75 mg/l<br />

• Total xylenes 0.62 mg/l<br />

• EDB 0.0001 mg/l<br />

2.4.4 Vadose Zone and Soil Vapor Contaminant Distribution<br />

Figures 2-3 through 2-6 (AFCEE, 2009) show the horizontal distribution of TPH in soil vapor at 150 ft<br />

bgs, 250 ft bgs, 350 ft bgs and 450 ft bgs (~30 ft above the water table). However, the TPH vapor data<br />

also suggest that the movement of LNAPL through the vadose zone was offset to the east and north,<br />

presumably by fuel migration along dipping clay layers. Conceptually, the TPH vapor results at 450 ft<br />

show the effect and correlate well with the distribution and orientation of LNAPL on top of the water<br />

table and with groundwater contamination.<br />

2.4.5 Light Non-Aqueous Phase Liquid Distribution<br />

The greatest thickness of LNAPL occurs in the area to the east of the Former Fuel Offloading Rack and is<br />

consistent with vadose zone migration of bulk LNAPL affected by clays dipping to the east and then<br />

following the groundwater table toward the north and east. Measurements of LNAPL were made on May<br />

14, 2010, of monitoring wells that have historically had or potentially have measurable thickness of<br />

LNAPL. The measured thicknesses are shown on Figure 2-7. Measured product was detected on the<br />

following wells:<br />

Kirtland AFB June 2010<br />

Groundwater Investigation Work Plan BFF 2-7

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