2.7.2.2. Ground Water Remedial Alternative No. 2

  1. Ground Water Extraction Plan for Remedial Alternative No. 2-Downgradient Control
  2. Treatment Options for Ground Water Remedial Alternative No. 2

2.7.2.2.1. Ground Water Extraction Plan for Remedial Alternative No. 2--Downgradient Control

Under this plan, extraction wells would be placed along the western boundary of LLNL to intercept and hydraulically control the offsite migration of those VOCs in concentrations exceeding MCLs. In addition, extraction would also occur in the Gasoline Spill Area, where a pilot remediation study is ongoing, and in the adjacent Building 518 Area to prevent migration of FHCs and VOCs to the south of LLNL. This plan would use a total of 10 extraction locations, 1 through 7 and location 9 in and near the western boundary of LLNL and locations 17 and 18 in the southeastern part of LLNL (Fig. 7). Extracted water would be treated at Treatment Facilities A, B, C, and F (Fig. 7). A plot of the predicted ground water flow patterns using the extraction locations for this plan is shown in Figure 9. The rate of ground water extraction for this plan isestimated to be about 200 gpm. This alternative would contain and remediate all known contaminants. It is estimated that it would take more than 90 years to achieve MCLs under this plan and that all extraction and treatment facilities would be operational in 1993.

2.7.2.2.2. Treatment Options for Ground Water Remedial Alternative No. 2

This alternative differs from Alternative No. 1 in that fewer initial extraction locations (10 compared to 18 for Alternative No. 1) and treatment facilities (4 compared to 7 for Alternative No. 1) would be employed. The treatment options discussed in Section 2.7.2.1.2 for Treatment Facilities A, B, C, and F would be identical for this alternative.

2.7.2.3. Ground Water Remedial Alternative No. 3--Deferred Action
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