Pat Quinn, Governor
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Pat Quinn, Governor |
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New Jersey Zinc/Mobil ChemicalNew Jersey Zinc/Mobil ChemicalFact Sheet #12
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| Is the Lake Remedial Investigation complete? | Yes. The DePue Lake Remedial Investigation (RI) was finalized in July 2009. Consultants for the DePue Group have been working closely with the Illinois EPA to insure that the RI would be completed per an approved work plan. Complete copies of the Lake RI Report and all maps and data sets have been placed in the public repository at the DePue Public Library. |
| What can be done to clean up site-related contamination of DePue Lake? | The Feasibility Study (FS) is the next step in the investigation and eventual clean-up process. The Illinois EPA expects to have the Feasibility Study Report by early 2011. A Proposed Plan will be developed by the Illinois EPA and a public comment period and public hearing will be held to gather input from citizens. |
| Why has it taken so long for the responsible parties to focus on the clean-up of DePue Lake? | The initiation of the DePue Lake RI was delayed until the South Ditch action could be completed. The South Ditch was receiving and transporting contaminated flows from ground and surface water. The Remedial Investigation of the Lake could not be initiated until the Interim Water Treatment Plant was operational and the impacted sediment was removed from the ditch. |
| Describe the types of contamination that have been found in the DePue Lake. | Results of the Remedial Investigation indicate that concentrations of metals (zinc, cadmium, copper, lead etc.) are elevated. The highest concentrations of these metals were located near the South Ditch discharge area and south of Division Street. |
| What are the most likely exposure pathways to potential contamination in DePue Lake? | The most likely human exposure pathway with DePue Lake is incidental ingestion of the turbid water, sediment and soil through recreational activities. |
| Are the fish in DePue Lake safe to eat? | The Illinois Department of Natural Resources (IDNR) has issued an advisory to limit consumption of catfish and carp to 1 meal per month of any size, 6 meals / year of fish less than 24 inches and not to eat fish greater than 24 inches caught in DePue Lake. In addition there is an advisory to limit largemouth bass to 1 meal / week, Channel Catfish to 1 meal / week less than 12 inches, 1 meal / month between 12 and 18 inches, 6 meals / year 16 to 18 inches and not to eat Channel Catfish greater than 18 inches. Carp, all sizes, should be limited to 1 meal / month in the Peoria Pool. Please see the 2009 Illinois Fishing Information booklet from IDNR. (The advisories are for PCBs and Chloradane; the New Jersey Zinc/Mobil Chemical site is not believed to be a significant contributor of these contaminants.) The advice in this table has been developed to protect infants, children and women of child bearing age. The advice may be over protective for women beyond child bearing age and adult men. |
| What can I do to minimize my exposure to potential contaminants in and around DePue Lake? | After coming in contact with Lake water, be sure to wash your hands before you eat or drink anything. If you fish, boat, wade, hunt or in any other way use DePue Lake, wash any mud from your cloths, skin, boat, oars, fishing rods, lures, drain boat bilge water etc. before you leave the lake area. |
The DePue Lake Remedial Investigation was directed toward assessing not only the lake but also flood plain soils below 450 ft. mean sea level (MSL). The 450 ft MSL was selected to mirror the normal annual flood elevation of DePue Lake. To accomplish this task the lake was divided into segments using a grid; flood plain soils (above flat pool but below 450 ft MSL) were assessed using sampling locations spaced at either 250 ft or 500 ft intervals determined by the likely past involvement with site activity or discharges. At most sampling locations multiple samples were collected at pre-determined depths.
| Sample Type | DePue Lake | Goose Lake** | Total Samples Analyzed |
|---|---|---|---|
| Total | 397 | 110 | 1108 |
| NC* – Not Collected Goose Lake** – Near Lacon was used as a comparison to DePue Lake | |||
| Water Samples by Type | |||
| Shoreline Seeps | 10 | NC* | 10 |
| Potential Under Water Seeps | 6 | NC* | 6 |
| Lake Surface Water | 10 twice | 2 twice | 24 |
| Sediment Samples by Type | |||
| Chemistry Cores (Deep) | 20 | 3 | 214 |
| Triad | 16 | 5 | 62 |
| Geochronology | 3 | 2 | 203 |
| Descrete Cores (Shallow) | 39 | 2 | 120 |
| Supplemental Focused Wading | 5 | NC* | 7 |
| Flood Plain Soils | 83 | 10 | 183 |
| Biotic Samples by Type | |||
| Fish Samples | 75 | 25 | 100 |
| Aquatic Insects | 8 | 4 | 12 |
| Emergent Insects | 16 | 10 | 26 |
| Flood Plain Vegetation | 40 | 20 | 60 |
| Frogs | 20 | 10 | 30 |
| Mice | 20 | 10 | 30 |
| Benthic Organisms | 16 | 5 | 21 |
| Jay A. Timm Community Relations Coord. Office of Community Relations Illinois EPA (217) 557-4972 |
Rich Lange Project Manager Illinois EPA (815) 447-2125 |
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