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For a waste containing metals,the waste is classified as California hazardous when: 1)the total metal content exceeds the respective Total Threshold Limit Concentration(ITLC), or 2)the soluble metal content exceeds the respective Soluble Threshold Limit Concentration (STLC) based on the standard Waste Extraction Test (WET). A waste has the potential of exceeding the STLC when the waste's total metal content is greater than or equal to ten times the respective STLC value since the WET uses a 1:10 dilution ratio. Hence, when a total metal is detected at a concentration greater than or equal to ten times the respective STLC, and assuming that 100 percent of the total metals are soluble, soluble metal analysis is required. A material is classified as RCRA hazardous, or Federal hazardous, when the soluble metal content exceeds the Federal regulatory level based on the Toxicity Characteristic Leaching Procedure(TCLP). The above regulatory criteria are based on chemical concentrations. Wastes may also be classified as hazardous based on other criteria such as ignitability and corrosivity; however, for the purposes of this investigation, toxicity (i.e., lead concentrations) is the primary factor considered for waste classification since waste generated during the construction activities would not likely warrant testing for ignitability or other criteria. Waste that is classified as either California hazardous or RCRA hazardous requires management as a hazardous waste. Per Section 25157.8 of the California Health and Safety Code, on or after January 1, 1999, no person shall dispose waste that contains total lead in excess of 350 mg/kg to land other than a Class I hazardous waste disposal facility. This new requirement applies if surplus soil is generated for off.-site disposal. PURPOSE AND PROJECT SCOPE The purposes of the work outlined in TO No. 04-150920-XC are to evaluate the extent of Icad-impacted soil within the proposed construction areas. The results of this investigation will be used to inform the construction contractor regarding the potential presence of lead-impacted soil at the site. Outlined below is a summary of the scope of services to be performed by Geocon under TO No. 04-150920-XC. Pre-Field Activities • A Health and Safety Plan is being prepared concurrently with this Workplan for the proposed field activities. The Health and Safety Plan provides guidelines on the use of personal protective equipment and the health and safety procedures to be implemented during the proposed field activities. • Geocon will retain the services of Sparger Technology, Inc. (Sparger), a California-Iicensed laboratory to provide the lead analyses. Field Activities Fieldwork for the 580/205 ADL Investigation project will occur along shoulders and medians Routes 205 and 580 in San Joaquin and AIameda Counties. The field activities to be performed are summarized below. Project No.FS 100-06-03 -2- September 4,2001