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KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

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SECTION 3<br />

being both an electrical source as well as a data collection point. The transects will be approximately<br />

1,850 feet in length. This distance is required to order to ensure that the data is collected to the depth of<br />

the target, or 500 feet. Typically the maximum spacing (distance between the source and receiver<br />

electrodes) is typically three times the depth of penetration needed to see the deepest target. A slightly<br />

larger distance is used for insurance.<br />

The field data will be post-processed, and cross sectional illustrations will be produced for both the IP and<br />

the DCRES data. Again, the data will be vertically and laterally corrected using a combination of land<br />

survey (elevation) and GPS data (horizontal) to an accuracy of 0.01 ft vertically and less than 1 ft<br />

horizontally, depending upon the GPS system used.<br />

In addition to the transects run in the BFF area, two transects will be run on the north end of the plume for<br />

the purpose of delineating the width of the LNAPL plume.<br />

3.3.1.3 Limitations of Surface Geophysical Methods<br />

The methods described above are necessarily indirect surficial data collection techniques and results are<br />

dependent upon the geophysical characteristics of the subsurface materials. Ultimately, these<br />

characteristics will dictate the resolution and relative accuracy of the data collected. An initial evaluation<br />

of the limited subsurface data related to lithology at this site indicates that the site is a reasonable<br />

candidate for the implementation of these techniques. Extremely thin layers of clay and silt may not be<br />

discerned unless there is a clear and measurable density contrast between the layers. This includes the<br />

ability to discern NAPLs. Borehole data will be used to the maximum extent possible to correlate and<br />

calibrate the geophysical data with the subsurface lithologic structure.<br />

3.3.2 Soil Borings/Drilling<br />

A total of 23 soil borings are included as part of this BFF Groundwater Work Plan. The 23 boreholes will<br />

be advanced for the purpose of installing 15 monitoring wells and 37 piezometers, which include 19<br />

nested locations where two wells will be installed in the same borehole. The correlation of soil<br />

borings/wells proposed for the Groundwater Investigation Work Plan, as compared to borings/wells<br />

shown on Table 5 of the NMED letter from the Hazardous Waste Bureau, dated 2 April 2010, is shown<br />

on Table 3-2. The number and location of the proposed borings/wells, included in this Work Plan, were<br />

primarily selected to define the nature and extent of the LNAPL and groundwater dissolved-phase<br />

contaminant plumes. The boring/well designations are included in Table 3-2 and 3-3. The boring/well<br />

locations are shown on Figure 3-2. The 23 borings will be advanced to the following horizons:<br />

• Two boreholes advanced to the groundwater table (“A”) horizon.<br />

• Five boreholes advanced to the “B” horizon.<br />

• Sixteen boreholes advanced to the “C” horizon.<br />

The anticipated depth to groundwater is approximately 500 ft bgs. The anticipated depths of the<br />

groundwater table (“A”) horizon monitoring well borings and “B” and “C” horizon piezometer borings<br />

are 510, 550, and 590 ft bgs, respectively. These horizons were primarily selected to define the vertical<br />

nature and extent of the groundwater dissolved-phase plume and to establish vertical hydraulic gradients.<br />

DQOs have been developed to address potential changes in well completion depths/screened intervals<br />

based on contaminant concentrations. NMED will be notified regarding any deviations in well<br />

constructions per Section 4.0.<br />

Kirtland AFB June 2010<br />

Groundwater Investigation Work Plan BFF 3-4

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