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This operating facility is considered a small quantity hazardous waste generator with paint sludges, oils, and solventscollected in 55-gallon drums. A hazardous waste disposal firm picks up about 8 to 10 drums every 3 months. The dome,sandblasting, and painting buildings provide some operation protection and containment. Years of adding spentsandblasting waste to an unlined ground fill may have increased the metal content of soil at the site. The profile of metalsin the nonhazardous spent sandblast material includes arsenic, beryllium, chromium, copper, lead, manganese, nickel, andzinc. The metal concentrations were determined in one sample in 1990 and are included in Table 1. Chemicals used orpresent on the site include acetone, toluene, xylene, mineral spirits, PCBs, solvents, oils, pigments, and paints. Workers atgreatest risk of exposure use personal protective equipment.

Little is known about past operations and disposal practices when Union Tank Car owned the property. More solventswere probably used then because the company regularly cleaned tank cars. The current owners appear to beenvironmentally conscientious and maintain operations in compliance with current standards. The two drainage ditches atthe site likely provide a migration pathway off the site; however, no off-site sampling has been conducted other than abackground sample S11 (collected October 1989) on the east side of Old St. Louis Road.

The distance to the nearest public water supply that uses a groundwater source was estimated to be about a mile away. Themunicipal wells used by Wood River may be in the direction of groundwater flow from the site.

Contaminants at a site are selected for further evaluation based on the following factors:

  1. Laboratory-determined concentrations in samples collected on and off the site.
  2. Review of the data quality, the field sampling techniques, the laboratory quality assurance and controls, and the sampling plan.
  3. Comparison of contaminant concentrations with background concentrations.

Comparison values are contaminant concentrations used to select contaminants for further evaluation. These valuesinclude, but are not limited to, Environmental Media Evaluation Guides (EMEGs) for chronic (CEMEG) or intermediate(IEMEG) exposures, Reference Dose Media Evaluation Guides (RMEGs), and Cancer Risk Evaluation Guides (CREGs). A description of the comparison values is found in Attachment 1.

All known inorganic chemical concentrations found in site soil and sediment samples, including those collected November1995 and samples gathered October 1989, are shown in Table 1. Comparison values are also presented in the table.Comparison values have not been developed for every chemical, so Illinois background soil concentrations found in urbanareas have also been included for comparison purposes.

Site background samples were collected in areas not believed to have been contaminated in October 1989. Sample S10 wascollected at the fence on the east side of the property. Sample S11 was collected toward the closest neighbor near Old St.Louis Road.

Following the 1989 sampling event, at the direction of the IEPA, the site operators remediated several contaminated areas. Therefore, the sample results do not reflect current on-site conditions. Since the 1995, sampling has been limited, and theolder samples were included in the tables for review and comparison purposes.

Arsenic and benzo(a)pyrene (BaP) were elevated in the soil and sediments believed to have been used as impoundments bythe former operators (Samples S4 and S5). BaP was also elevated in the former water processing area and the drum storagearea. Chlorinated solvents were present at levels above comparison values in the soil sample from the stenciling area (S6). Those areas may have been excavated, covered, or otherwise remediated.

The two ditch samples collected in November 1995 did not contain any chemical at levels above comparison values. Aslight elevation of antimony (20.4 ppm) was noted in the sample collected from the northern drainage ditch. Groundwatersample G102 collected in November 1995 was such a small volume that assays for VOCs or SVOCs were not definitive. The one successful boring occurred at the northwest corner of the site that is upgradient of the groundwater movement offthe site. A pesticide scan of G102 showed the presence of some trace chemicals, none greater than comparison values. Nopesticides are known to be associated with this site, and the trace values found are probably representative of those found inIllinois. No groundwater from the site has been analyzed for inorganic compounds.

So far, sampling has not shown any consistent pattern of contamination or site characterization. Off-site migration has notbeen shown through surface water routes or by any other route. Many sources of metals and inorganic chemicals exist inIllinois. Metals are naturally occurring in sand, metal alloys, fertilizers, sewage sludge, soils, groundwater, and from waterdistribution systems. Site-related metal contamination may be related to railroad beds, road construction and usage, andfluids from vehicles.

Nearby residential property is apparently upgradient, and most of the operations are contained in buildings. No knowncomplaints have been documented from neighbors. Groundwater contamination has not been shown but may be apossibility due to old surface and subsurface contamination. Field instruments used during the November 1995investigation detected the presence of VOCs in the borehole and from the soil core removed near the old ponds and thepaint shop south of the dome.

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