PR0535342 - Laserfiche WebLink

Home Browse Search

1 .6. Previous Investigations To the CIWMB's knowledge, no other governmental agency or consultant has conducted a previous investigation in the northern or southern disposal areas. The overall site was investigated by the U.S. EPA Emergency Response Section, under the authority of the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) and Superfund Amendment and Reauthorization Act (SARA). The EPA directed a Superfund Technical Assessment Response Team (START) to conduct a preliminary Remedial Investigation/Feasibility Study (RI/FS) of the Site. The field sampling activities were conducted from October 15 through December 13, 2001. The purpose of the preliminary RI/FS was to determine the impact on soil and groundwater quality at the Site from the tire fire. Additionally, analytical data was gathered to determine the extent of contamination at the Site and to characterize soil for removal by the CIWMB. 2. Project Objective 2.1 . Waste Characterization In accordance with California and federal hazardous waste standards, the soil at the two identified and other yet undiscovered solid waste disposal areas will be characterized to determine if the soil contains hazardous concentrations of metals or other pollutants. The CIWMB will use regulatory limits established by the DTSC and federal levels for evaluating solid wastes. Based on visual observation, soil samples for the southern disposal site will be analyzed for priority pollutant metals, while soil from the northern disposal area will be analyzed for metals, volatile organic compounds (VOCs), semivolatile organic compounds (SVOCs), and total petroleum hydrocarbons as diesel (TPHd). If other waste disposal areas are identified, the CIWMB will decide what analyses will be conducted for the samples that will be submitted to the laboratory. For purposes of characterizing the soil, the following regulatory standards shall be used to determine if the soil is hazardous: ➢ Federal Toxicity Characteristic. The soil may be classified as a RCRA hazardous waste if it exceeds the federal toxicity characteristic limits defined in Title 40 CFR §261 et. seq. These federal standards are based on soluble concentrations from the Toxicity Characteristic Leaching Procedure (TCLP). Should the soluble concentration of any sample exceed the TCLP, then the waste is classified as a federal hazardous waste (i.e., RCRA waste). ➢ State of California Toxicity Characteristic. The soil may be classified as a California hazardous waste if it exceeds the toxicity levels listed in Title 22 CCR, Division 4.5, Chapter 11, Article 5, §66261.101. The California toxicity levels are divided into two separate concentration limits. The waste concentrations are evaluated using both the Total Threshold Limit Concentration (TTLC) and Soluble Sampling Plan for Small Waste Disposal Areas (final).doc 3