SOURCE AREAS AND WASTE CHARACTERISTICS Sample Clauses

SOURCE AREAS AND WASTE CHARACTERISTICS. The potential source area was the material located in the landfill. Test pit exploration indicated the landfill contained primarily dirt with glass. A few bricks, concrete pieces, porcelain, and metal objects were encountered. Plastic and/or paper objects were not encountered.
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SOURCE AREAS AND WASTE CHARACTERISTICS. The general distribution of PCE detected in groundwater is shown on Figure 3. This figure shows data from this SI, data supplied by the owners of the ▇▇▇▇▇▇▇ property. Data from the PA and from DEQ sampling of domestic water ▇▇▇▇▇ conducted in 2004 served to define the area of investigation but is not included in this figure. The highest PCE concentrations investigated to data occur at the ▇▇▇▇▇▇▇ Property. The low levels of PCE detected in the groundwater samples collected from the neighborhood borings, and somewhat higher levels detected in residential ▇▇▇▇▇, suggest that the shallow source is not in the neighborhood. One goal of this SI was designed to evaluate the likelihood that the ▇▇▇▇▇▇▇▇ Property or the ▇▇▇▇▇▇▇ Property may be sources of the PCE associated with the Keizer Areawide Groundwater Contamination. PCE concentrations in shallow groundwater at the ▇▇▇▇▇▇▇▇ Property range from 3.05 to 7.69 μg/l. Based on these data, the ▇▇▇▇▇▇▇▇ Property does not appear to be a significant source of the contamination seen throughout Keizer. High levels of PCE, including one shallow groundwater sample containing 126,000 g/L of PCE, and a septic tank containing high concentrations of PCE, were reported at the ▇▇▇▇▇▇▇ Property. Dry cleaning, using PCE, has been documented at the former Keizer Kleaners, which operated on the ▇▇▇▇▇▇▇ Property from 1975 to 1983. These data suggest that the ▇▇▇▇▇▇▇ Property is a significant source of the PCE cgroundwater ontamination. and the ▇▇▇▇▇▇▇ property appears to be the the most significant PCE source at the Keizer Areawide Groundwater Contamination site.. TCE levels at this site are also significantly above screening values. The TCE may be related to releases of TCE or decay of PCE in the subsurface.
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SOURCE AREAS AND WASTE CHARACTERISTICS. The source of TCE in groundwater is unknown. After reviewing DEQ databases and business directories, and conducting a site visit to the area, DEQ has determined that there are several potential sources of TCE contamination. ▇▇▇▇▇▇ County has used solvents in their facility in the past, although there is no documentation of their usage of TCE. There may have been a release along the railroad line or from railroad cars parked on the spur between the ▇▇▇▇▇▇ County Shops and ▇▇▇▇▇ Street. However, there are no records of TCE being transported on this line. Residents may have used solvents in their shops. The source of TCE may have been surface spills migrating to groundwater, or disposal of chemical wastes into septic systems. Analytical results from residential water samples and the temporary well points indicated that TCE is present in groundwater at the ▇▇▇▇▇▇ County Shops, in the vicinity of the WPRR railroad, and in four residential ▇▇▇▇▇. (See Figures 3 and 4.) Also, 1,1-DCE, cis-1,2-DCE, trans-1,2-DCE, 1,2-DCA, and mp-xylenes were present in a few water samples. The following points highlight potential sources of TCE contamination: Temporary well points SB1/GW1-WS and SB1/GW1-LG did not contain TCE, which suggests that the source is not the City Industrial Center, Chevron Bulk Plant, or Evanite Products because boring SB1 was located closest to these facilities. Temporary well points SB2/GW2-LG (1.9 μg/l) and SB11/GW11-WS (10.8 μg/l) contained low levels of TCE which indicates there may be a source of TCE near the ▇▇▇▇▇▇ County vehicle maintenance shop. Temporary well points SB3/GW3-LG, SB4/GW4-LG, and SB5/GW5-LG did not contain TCE, which indicates the source has not migrated to this area. Temporary well point SB6/GW6-LG contained the second highest level of TCE (490 μg/l), which indicates there may be a source associated with the WPRR railroad or residential properties immediately to the west of SB6. Temporary well points SB7/GW7-LG contained the highest level of TCE (491 μg/l), which indicates there may be a source near the southwest area of the ▇▇▇▇▇▇ County Shops. Temporary well point SB8/GW8-LG did not contain TCE, which indicates the source is likely not from the drainage ditch for ▇▇▇▇▇▇ County’s wash rack or from the former ▇▇▇▇▇ Mining site. Temporary well point SB9/GW9-LG contained low levels of TCE (2.1 μg/l), which indicates that groundwater plume is extending into Avery Park. Temporary well point SB10/GW10-WS did not contain TCE. This samp...
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