ML060330078
| ML060330078 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png (DPR-006) |
| Issue date: | 08/04/2004 |
| From: | - No Known Affiliation |
| To: | NRC/FSME |
| Shared Package | |
| ML060320259 | List:
|
| References | |
| FOIA/PA-2005-0293 | |
| Download: ML060330078 (2) | |
Text
A Basis for 20.2002 Alternative Disposal Procedure for US Ecology Idaho Site Site location and Physical Data Southeast of Boise, Idaho in Greenview, Idaho (Population 350) 1 resident within 1 /2 miles (1 1/4 mi east)
- Mean elevation - 2600 ft
- Average rainfall - 7.26 in. /yr (Desert Environment)
- Average Evaporation Rate - >42 in. /yr Facility Design
- Facility is a Subtitle C RCRA hazardous waste disposal facility permitted by the State of Idaho (EPA Agreement State)
- Has received radioactive material since 2002, hazardous waste since 1973
- Permitted/regulated for receipt of Radioactive Materials under Idaho Hazardous Waste Management Act and rules issued by the Idaho Department of Environmental Quality - Allowable dose to member of public after site closure -
thk5 mrem/yr TEDE, No separate groundwater standard lwc V"I
- Runoff mitigated by runoff collection, containment and solar evaporation system
- 3.6 meter Cover when a cell is closed consisting of compacted soil & 40 mil HDPE liner
- 61 meter thick unsaturated zone between the base of the disposal cell and groundwater 31 meter thick contaminated zone
- Currently Operating Cell #15:
o Designed for 3.6 Million Cubic Yards aA-Ac dI X-tA~l l)o (
o 2 polyethylene liners with leak detection system between liners at the cell J
bottom, additional clay banier layer below the poly liners Post-Closure Plan
- As required for RCRA disposal facilities o Post Closure Monitoring for 30 years Radiation Protection-Program - Operational
- Airborne Effluents Monitoring
- Site Personal dose monitored/mainl:ained below 400 mrem/yr (Basis for Waste Acceptance Criteria)
- General Radiation Protection Standard for the public o 100 mrem/yr TEDE onsite o 25imrern/yr TEDE offsite
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NRC Approved Disposal of Radioactive Materials from
- Kaiser Aluminum - Thorium and Radium - Disposal approved by NRC under 40.13 (Unimportant Quantities of Source Material) - Shipments to begin later this month
- Mallinckrodt, Inc - Embedded Natural Uranium and Thorium - Disposal approved by NRC under 40.13 - Volume to Date: 7,000 Cubic yards CY Disposal Plans
- Maximum Vo ef4000 ubyards (Approximately 1 % of the volume of Cell #15)
- Concrete and structural metal from demolition of portions of building above 4 foot below grade, certain basements
- Inside concrete structures of certain buildings such as containment, remediated soil x I I
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-w Proposed Dose Modeling Information J V-
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Resident Farmer Scenario i
- Utilize RESRAD Version 6.21 Ar'tis Je V) vlAs O I Input Parameters: (As utilized in Kaiser Aluminum 40.13 submittal)
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e, TA-ge vkkLLL AC)t' o Cover Depth: 3.6 meters o Thickness of Contaminated Zone: 31 meters o Unsaturated Zone Thickness: 61 meters(measured depth to water table) o Area of Contaminated Zone: 88,220 square meters o Length parallel to aquifer flow: 543 meters o Hydraulic gradient of the saturated zone: 0.007 o Hydraulic conductivity of the saturated zone: 6.7 m/yr o Contaminated zone hydraulic conductivity 31.6 m/yr o Evapotranspiration coefficient (0.75), precipitation (0.184 rn/yr) o Density of cover: 1.78 g/cc (Based on average cover material) o Cover Total Porosity: 0.412 (Based on average cover material) o Cover volumetric water content: 0.0265 (Based on average cover material) o Cover erosion rate: 0.0001 in/yr (Based on lack of precipitation & cover materials of construction) o Use RESRAD default values for all other parameters o Unlike Kiaser Aluminum, propose to use RESRAD defaults for:
Cover radon diffusion coefficient Contaminated zone radon diffusion coefficient Building Air Exchange rate 1jj
~ U1--%11)
/
_U I TT Precedent for 20.2002 for CY type of waste material a
Big Rock Point decommissioning waste disposal at a State of Michigan licensed Type 11 landfill
- Utilized RESRAD Version 6.0QA]I input Parameters were RESRAD Defaults except:
o 18" infiltration layer and 24 erosion assumed intact at end of 30 year post closure monitoring period