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KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

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SECTION 3<br />

piezometers. Groundwater samples will be field screening of dissolved oxygen, oxidation reduction<br />

potential, turbidity, conductivity, specific conductance, temperature, and ferrous iron. Groundwater<br />

samples will be analyzed at a laboratory for VOCs, TPH, and PAHs to determine groundwater quality<br />

beneath the site. Groundwater samples will also be analyzed at a laboratory for cations, anions, methane,<br />

iron, manganese, nitrate-nitrite, and sulfate-sulfide to determine if, and to what degree, natural attenuation<br />

is occurring. Well designations are included on Table 3-2, along with additional information. Well<br />

construction details are described above (Section 3.3.4). Well locations are shown on Figure 3-2.<br />

Depth to product, depth to water, and product thickness will be measured in each groundwater monitoring<br />

well prior to sampling using an electronic oil-water interface probe or similar device. Eight monitoring<br />

wells (KAFB10630 through KAFB10633 and KAFB10635 through KAFB10638) are anticipated to be<br />

located within the lateral extent of the product plume (see Figure 3-2). Depth to water will be measured in<br />

each piezometer prior to sampling using an electronic water level indicator or similar device.<br />

Activities associated with groundwater sampling and field screening, IDW handling, and equipment<br />

decontamination will be performed in accordance with the Base-Wide Plans for Investigations Under the<br />

Environmental Restoration Program, 2004 Update, Kirtland Air Force Base, Albuquerque, New Mexico<br />

(Tetra Tech, 2004) and other pertinent site documents.<br />

3.3.7 Groundwater and LNAPL Measurements<br />

After installation and development (as appropriate based on presence or absence of product) of each<br />

proposed groundwater monitoring well/piezometer nest, water level measurements will be collected to<br />

establish horizontal and vertical gradients to determine if an upward or downward vertical hydraulic<br />

gradients exist between the groundwater table (“A”), “B” and “C” horizons. If the wells are installed<br />

within the LNAPL plume an LNAPL thickness will be measured. During field operations associated with<br />

this Work Plan, depth to groundwater and product measurements will be taken on a monthly basis to<br />

create potentiometric surface maps indicating flow directions for all horizons. Monthly measurements<br />

will address any seasonal changes in flow directions within each aquifer horizon and gradients between<br />

horizons due to fluctuating pumping rates from the nearby water supply wells (refer to Table 2-2 for a<br />

listing of water supply wells). These measurements will also be taken during quarterly groundwater<br />

monitoring events.<br />

Activities associated with groundwater and LNAPL measurements and equipment decontamination will<br />

be performed in accordance with the Base-Wide Plans for Investigations Under the Environmental<br />

Restoration Program, 2004 Update, Kirtland Air Force Base, Albuquerque, New Mexico (Tetra Tech,<br />

2004) and other pertinent site documents.<br />

Kirtland AFB June 2010<br />

Groundwater Investigation Work Plan BFF 3-8

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