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KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

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SECTION 2<br />

the soils. Only that part of the fuel that is present in the vadose zone at greater than residual saturation<br />

will continue to migrate.<br />

A secondary transport mechanism within the vadose zone in the source area is within the soil vapor.<br />

Vapor phase contamination occurs as contaminants partition from entrapped LNAPL and soil water into<br />

soil gas. Vapor phase contamination will disperse in an approximately spherical pattern through the<br />

vadose zone surrounding the source area. For this reason, additional monitoring points have been located<br />

radially around the source area and vertically across the vadose zone to allow delineation of this spherical<br />

vapor plume. In addition to vapor migration vertically down to the groundwater table, vapor migration<br />

vertically upwards to the ground surface also is a potential.<br />

Groundwater flow and hence contaminant transport is affected by both the regional groundwater flow and<br />

the localized effects of induced groundwater flow from pumping. Locally, the effects of pumping can<br />

induce increased gradients vertically and laterally. Transport of dissolved contaminants will be affected<br />

by both physiochemical retardation and biodegradation.<br />

2.5 Potential Receptors<br />

The Veterans Administration (VA) Medical Center water well and KAFB groundwater production wells<br />

KAFB-15 and KAFB-16 are located sidegradient of known areas of petroleum hydrocarbon<br />

contamination. The VA Medical Center Water well, KAFB groundwater production wells, and water<br />

utility authority well fields will be considered potential pathways of exposure until they can be excluded<br />

with defensible data. During the second quarter 2009 sampling, TPH-DRO was the only chemical<br />

detected in KAFB-16 well at 0.26 micrograms per liter (µg/L) but it was determined that this contaminant<br />

was likely introduced into the well through lubricating oil used for lubrication of the well pump. Water<br />

production wells KAFB-3 and Burton Well W-5 are located 3,800 and 3,700 ft, respectively,<br />

downgradient of the leading edge of the EDB plume and 5,400 ft and 4,800 ft, respectively, downgradient<br />

of the LNAPL plume. Well construction information and estimated capacities are presented in Table 2-2.<br />

Well Name<br />

Table 2-2. Water Production Wells, Vicinity of Kirtland AFB<br />

Solid Waste Management Units (SWMU) ST-106 and SS-111<br />

Install Total Depth Screen Interval Casing<br />

Date (ft bgs)<br />

(ft bgs)<br />

(in)<br />

Est. Capacity<br />

(gpm)<br />

Burton 5 1991 1,170 550-1,150 20 3,000<br />

Ridgecrest 5 1990 1,550 690-1,530 20 3,000<br />

VA 1956 997 No data No data No data<br />

Kirtland 3 No data No data No data No data No data<br />

Kirtland 15 1996 1,511 700-1,430 18 2,500<br />

Kirtland 16 1996 1,511 710-1,400 18 2,500<br />

Construction workers who may be exposed to subsurface soils are also potential receptors. However, the<br />

existing KAFB digging permit clearance process provides notification and protection against<br />

inappropriate exposures to construction workers.<br />

Vapor intrusion may be a concern in any buildings located near the LNAPL release. An investigation of<br />

the potential for vapor intrusion was completed for two buildings overlying the LNAPL showed that risks<br />

associated with indoor air quality are acceptable. The report is currently in draft.<br />

Kirtland AFB June 2010<br />

Groundwater Investigation Work Plan BFF 2-9

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