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MAP LEGEND

Current Study Overlays

Study Areas View Metadata

Current Study Area

Future Phases

** The study areas are approximate boundaries for each phase of the CFR OU.

Tested Properties View Metadata

Sampled areas within the CFR OU (Label = LUID)

** During the fall of 2009, soil sampling was completed for 14 residential properties and a KOA campground in Deer Lodge, Montana, located in the Clark Fork River Operable Unit of the Milltown Reservoir/Clark Fork River Superfund Site. As part of this effort, the Montana Department of Environmental Quality (DEQ) contracted TerraGraphics Environmental Engineering, Inc. to identify areas at the properties that exceed the residential exposure Risk-Based Concentration (RBC) for arsenic (150 mg/kg) and/or the screening-level RBC for lead (400 mg/kg) and to identify areas at the KOA campground that exceed the recreational exposure RBC for arsenic (680 mg/kg) and/or the screening-level RBC for lead (400 mg/kg).

The sampling effort included a total of 15 properties, resulting in the collection and laboratory analysis of 532 primary soil samples and 94 quality control samples (i.e., rinsate blanks, field blanks, standard reference material, and field duplicates). The analytical results for all samples collected, including field quality control results, are shown in Appendix A. Out of the 532 results obtained for locations sampled in the Deer Lodge Properties focus area, less than 1%exceeded the recreational exposure RBC of 680 mg/kg arsenic and 10% exceeded the 150 mg/kgresidential exposure RBC for arsenic. Overall, 3% of the samples collected exceeded the 400mg/kg screening-level RBC for lead.

The highest arsenic concentration encountered in the Deer Lodge Properties focus area was collected from a source area (slicken) adjacent to the Clark Fork River at one of the residential properties (1,490 mg/kg arsenic). The highest lead concentration encountered was measured in a sample collected from a residential yard area adjacent to the Clark Fork River (1,070 mg/kg Lead).

Test Pits View Metadata

Pit locations, laboratory analytical results and XRF results

** In general, the investigation sampling approach consisted of test pit locations, spaced on a north-south – east-west grid pattern with 125-foot centers. Additional sample locations were identified outside of the 125-foot grid system within historic channels or old oxbows. Samples were collected at 6-inch intervals and screened in the field until one of the following conditions was met:

- Evaluation of field XRF data indicated that the sum of As, Cu, and Zn concentrations (i.e.total COC concentrations) was below 500 mg/kg.

- Course alluvium having a rock content of 60% or more (visual estimation), or bedrockwas encountered. These conditions are believed to provide sufficient protection from erosion.

Sampling areas began with the RipES preliminary polygons (CH2MHill, 2004) including Slickens, Impacted Soils and Vegetative Areas, Miscellaneous Site Types and Slightly Impacted Soils and Vegetation Areas. Floodplain sampling activities began on August 24, 2009, and were completed on September 30, 2009. This DSR only present a summary of data collected from Part 1 of this SAP Addendum. Information collected under Part 2 of this SAP addendum will be summarized in a separate report. A total of 635 natural samples, 38 field duplicates, and 23 filed blanks were submitted for laboratory analysis from 269 test pits. Additional samples were collected but not submitted to the laboratory for analysis and archived for future analysis, if necessary.

Weed Control View Metadata