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NAPL Area 2
Figure 8 presents the TCE concentrations in groundwater in NAPL Area 2 from the interior monitoring wells before, immediately after and 7 months following ERH. Seven months following the ERH remediation in NAPL Area 2, average TCE concentrations in the interior groundwater monitoring wells continued to decline by an average 93.4% reduction compared to the pre-ERH concentrations.
Figure 9. Pre and Post ERH Average TCE Concentrations in Soil in NAPL Area 2
Figure 9 illustrates the average TCE and DCE concentrations in soil pre and eight months post ERH in NAPL Area 2. Eight months following ERH the average TCE and DCE soil concentrations were reduced by 99.99% and 98.88%, respectively, when compared to pre-ERH concentrations. Forty-four percent of the soil samples were non-detect for TCE.
Figure 9. Pre and Post ERH Average TCE Concentrations in Soil in NAPL Area 2
| COC | Pre-ERH Average (ug/kg) |
April 2006 Average (ug/kg) |
Perecent Reduction |
PercentND |
|---|---|---|---|---|
| TCE | 202,338 | 28 | 99.99% | 44% |
| DCE | 5.130 | 58 | 98.88% |
Figure 10 illustrates the TCE concentrations in groundwater pre, post, and seven months following ERH in the exterior monitoring wells in NAPL Area 2. Seven months followingERH, TCE concentrations in the exterior groundwater wells declined by an average 88.7% when compared to the pre-ERH data.
A total of 27,876 lbs of mass was removed in NAPL Area 2. About 90% of the total mass was TPH, about 9% was TCE and the remaining 1% was cis DCE and vinyl chloride.
Figure 10. TCE Concentrations in Groundwater Pre, Post and Seven Months After ERH in NAPL Area 2 Exterior Wells