SCH Number,Lead Agency Name,Lead Agency Title,Lead Agency Acronym,Document Title,Document Type,Received,Posted,Document Description,Document Portal URL,Project Title,Contact Full Name,Contact Authority,Contact Job Title,Contact Email Address,Contact Address 1,Contact Address 2,Contact City,Contact State,Contact Zip Code,Contact Phone Number,Location Coordinates,Cities,Counties,County Clerks,Location Cross Streets,Location Zip Code,Location Total Acres,Location Parcel Number,Location State Highways,Location Waterways,Location Airports,NOC Has Non Late Comment,NOC State Review Start Date,NOC State Review End Date,NOC Development Type,NOC Local Action,NOC Project Issues,NOC Local Review Start Date,NOC Local Review End Date,NOE Exempt Status,NOE Exempt Citation,NOE Reasons for Exemption,NOD Agency,NOD Approved By Lead Agency,NOD Approved Date,NOD Significant Environmental Impact,NOD Environmental Impact Report Prepared,NOD Negative Declaration Prepared,NOD Other Document Type,NOD Mitigation Measures,NOD Mitigation Reporting Or Monitoring Plan,NOD Statement Of Overriding Considerations Adopted,NOD Findings Made Pursuant,NOD Final EIR Available Location 2021070473,"Toxic Substances Control, Department of",Department of Toxic Substances Control,,Centennial M1 Property Clean-Up Project Remedial Action Plan,MND,7/26/2021,,"This remedial action involves excavation and on-site consolidation of approximately 133,800 cubic yards of contaminated soil that has metal concentrations (primarily arsenic, lead, mercury, thallium and nickel) above commercial/industrial use cleanup levels. In addition, stabilization of approximately 4,200 cubic yards of soil is required to chemically stabilize constituents of concern from a small area of the Site by mixing this material with Portland cement to reduce its water solubility prior to consolidation. The consolidation area is approximately 5.6-acres in size and will be capped with four to five feet of clean soil that will be obtained from the Site so soil import will not be necessary. The capping and regrading of excavated areas will utilize approximately 129,100 cubic yards of soil from designated borrow areas on the Site. Following the consolidation and capping, erosion control measures and groundwater monitoring wells will be installed to ensure the effectiveness of the remedy. The purpose of the project is to remediate the soil to levels that no longer present a risk to human receptors under a commercial/industrial use scenario. Rise Grass Valley Inc. (Rise) entered into a Voluntary Cleanup Agreement (VCA; Docket No. HSA-FY18/19-014) with DTSC for the voluntary cleanup of soil contamination on the Centennial M1 Property (site). A Centennial M1 Property Remedial Action Plan (RAP; 2020) was prepared that describes the proposed procedures for conducting remedial activities related to the Remedial Action Objectives (RAO’s). The 56-acre site is located at 10344 Centennial Drive near the city limits of Grass Valley (City) in unincorporated Nevada County (County), California. This site was historically used for disposal of mine waste (tailings and waste rock) from a former underground hardrock (lode) gold mine, the Idaho-Maryland Mine (IMM). Mine waste is present on approximately two-thirds of the site. Site investigation has identified that some of the mill tailings, waste rock, and affected soil at the site that contain lead, arsenic, mercury, and other metals at concentrations exceeding background soil metals concentrations and regulatory benchmark concentrations.",https://ceqanet.opr.ca.gov/2021070473,Centennial M1 Property Clean-Up Project Remedial Action Plan,Dean Wright,"Department of Toxic Substances Control, Project Manager",N/A,dean.wright@dtsc.ca.gov,8800 Cal Center Drive,,Sacramento,CA,95826,9162553591,,Grass Valley,Nevada,,10344 Centennial Drive,95945,56.41,"009-550-032, 009-550-037 thru 040, & 009-560-036",49,Wolf Creek,Nevada County Airport/Air Park,No,7/26/2021,8/24/2021,Other,,"Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Drainage/Absorption, Energy, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Sewer Capacity, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire",,,,,,,,,,,,,,,,,