Hanford Site ground-water monitoring for April through June 1987

Evaluation of chemical sensors for in situ ground-water monitoring at the Hanford Site

“…However, we must be able to show that in situ monitoring can match the sensitivity of the current ground-water MCLs for individual contaminants. Area Process Trenches, and the Central Landfill (Evans, Mitchell, and Dennison 1988) ( Figure 3.1). Most of the Hanford Site property outside the designated areas in Figure 3.1 is referred to as the 600 Area.…”

“…Several recent reports (Evans, Mitchell, and Dennison 1988;Law, Serkowski, and Schatz 1987;PNL 1987) describe the monitoring networks and results for monitoring programs at the Hanford Site. The following contaminants are discussed in 3.1 4) chlorinated hydrocarbons in the vicinity of the Central Landfill; 5) uranium at two disposal cribs in the 200 West Area; 6) tritium across the site; and 7 ) nitrate across the site.…”

“…The plume hac spread into the 600 Area on the east and west sides of the 200 West Area, and north, near the fence line. The MCL for carbon tetrachloride is 5 ppb (U. S. EPA, 1988 Carbon tetrachloride contamination probably originated from a soil disposal column facility (crib) at the Plutonium Finishing Plant (Evans, Mitchell, and Dennison 1988). From 1955 through 1973, degraded solvents from various solvent-extraction processes were disposed of to the crib.…”

“…A ground-water mound still exists beneath the now-decommissioned U Pond, causing ground water to flow radially outward. Evans, Mitchell, and Dennison (1988)…”

“…. Several chlorinated hydrocarbons, of which 1,l ,l-trichloroethane was the most abundant, have been found near the central landfill (Evans, Mitchell, and Dennison 1988). The highest concentration of 1 , l ,l-trichloroethane was 56 ppb; 1,1,2-trichloroethylene, 1,l -dichloroethane, carbon tetrachloride, and perchloroethylene were found in lesser amounts.…”