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2003-08-26_GENERAL DOCUMENTS - C1981041
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2003-08-26_GENERAL DOCUMENTS - C1981041
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Last modified
5/19/2020 12:30:16 PM
Creation date
11/23/2007 10:00:50 AM
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DRMS Permit Index
Permit No
C1981041
IBM Index Class Name
General Documents
Doc Date
8/26/2003
Doc Name
Proposed Decision & Findings of Compliance for RN4
Permit Index Doc Type
Findings
Media Type
D
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CRDA-1 and CRDA-3, and a minimum of 24" on CRDA-2. Non-toxic cover borrow areas, and <br />topsoil and subsoil suitability levels and sampling plans were defined by TR-17, in April, 1994. <br />Reclamation of refuse areas will entail replacement of a minimum 6" topdressing layer with SAR of <br />12 or less and EC of 8 or less. The lower 12" to 18" of cover, as applicable, will have maximum limits <br />of 25 and 15, for SAR and EC, respectively. <br />During adequacy review associated with RN-4 and TR-42, the Division requested that the operator <br />submit soils data, evaluation, and mapping, pertinent to pre-salvage and post-spread sampling <br />conducted in association with 2002 refuse area cover-soiling and top-soiling operations. The <br />requested soils data and mapping were presented in new Appendix 9-7, with narrative evaluation <br />on amended pages 9-4 through 9-7, and amended pages 14-6 through 14-8, and 14-11 of the <br />reclamation plan. <br />At CRDA-2, subsoil was obtained primarily from excavation within and adjacent to the Coal <br />Creek channel and from construction of the new upper diversion; topsoil was from long-term <br />stockpiles. At CRDA-1, the entire cover soil thickness (subsoil and topsoil) was obtained from the <br />CBA-2 borrow azea. At the RSRDA, the entire cover soil thickness was obtained from the <br />RSRDA soil borrow azea. Soil Stockpile No. 3 was the primary source of topsoil used in the <br />North Portal Facilities Area reclamation project. 2002/2003 sample results for aeeas reclaimed in <br />2002 aze summarized below. <br />CRDA-2 <br />Data indicates that CRDA-2 subsoil was relatively high quality, with only 1 minor <br />exceedance of the EC subsoil criteria out of 15 samples (avg. EC=8.0), and no <br />exceedances of the SAR subsoil criteria (avg. SAR=6.9). Texture was silt loam or silty <br />clay loam. Sample data for the 6 inch respread topsoil layer at CRDA-2 indicates that, in <br />general, the topsoil was similaz or lower quality growth medium than the subsoil- There <br />were 5 exceedances of the EC topsoil criteria out of 15 samples (avg. EC=7.1), and 4 <br />exceedances of the SAR topsoil criteria (avg. SAR=10.8). <br />CRDA-1 <br />CRDA-1 respread soils data reflect sampling of the entire 18 inch cover soil thickness <br />(subsoil and topdressing combined). The material in general meets the subsoil criteria <br />(only three of 16 samples exceeded either EC or SAR criteria). However, 12 of the 16 <br />samples exceeded the topsoil criteria for either or both pazameters. Average EC value was <br />11.0, average SAR value was 11.7. Soil salvaged from CBA-2 and replaced on CRDA-1 <br />appeazs to have been somewhat higher quality than the soil available in Soil Stockpile 2, <br />mazginally lower quality than than Stockpile 1, and comparable to the soil available from <br />Stockpile 3 (see table below). <br />Sampled Area EC (avn,.l SAR (avg;) <br />CRDA-1 Cover Soil 11.0 11.72 <br />Topsoil Pile 1 7.8 11.54 <br />Topsoil Pile 2 13.3 18.01 <br />Topsoil Pile 3 8.0 14.0 <br />36 <br />
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