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BACKGROUND <br /> Ongoing testing by Caltrans throughout the State has indicated that aerial deposited lead exists along <br /> major freeway routes due to emissions from vehicles powered by leaded gasoline. Caltrans reports <br /> that total lead concentrations in soil adjacent to the freeways have typically ranged between 50 and <br /> 3,000 milligrams per kilogram (mg/kg). The aerial deposited lead is generally limited to the upper <br /> 0.6 meter(m)of soil material within the unpaved shoulder and median areas. <br /> For a waste containing metals, the waste is classified as "California hazardous" when: 1) the total <br /> metal content exceeds the Total Threshold Limit Concentration (TTLC); or 2) the soluble metal <br /> content exceeds the Soluble Threshold Limit Concentration (STLC) based on a Waste Extraction <br /> Test (WET) analysis. A material is classified as "RCRA hazardous" when the soluble metal content <br /> exceeds the Federal Regulatory Level based on Toxicity Characteristic Leaching Procedure (TCLP) <br /> testing. <br /> The above regulatory criteria are based on toxicity. Wastes may also be classified as hazardous based <br /> on other criteria such as flammability, reactivity, corrosivity, and ignitability. However, for the <br /> purposes of this investigation, toxicity (i.e., lead concentrations) and corrosivity (i.e., pH analysis) <br /> are the primary factors considered for waste classification. Based on current and past site usage, <br /> onsite soil is not expected to exhibit other hazardous waste characteristics. <br /> Waste that is classified as either "California hazardous" or "RCRA hazardous," requires <br /> management as a hazardous waste and disposal at an appropriately permitted disposal facility. <br /> PROJECT SCOPE <br /> Outlined below is a summary of the scope of services to be performed by Geocon under TO No. 10- <br /> 445401-LQ. <br /> Pre-Field Activities <br /> • Conducted a Task Order Meeting on March 20, 2002 to discuss the TO scope of work. Caltrans <br /> Contract Manager Michael Robinson and Geocon's Task Order Manager Rebecca Silva <br /> attended the meeting. The purpose of the Task'Order Meeting was to identify and observe the <br /> project boundaries and conditions and sign the Site Visit Checklist, Completion Schedule and <br /> Notice to Proceed. <br /> • Obtain a Caltrans Encroachment Permit from the Caltrans District 10 permit office to complete <br /> the scope of work outlined in this Workplan and the subject TO. <br /> • Obtain a permit from the San Joaquin County Environmental Health Department for the 3 m <br /> deep direct-push soil borings at the proposed sound wall locations. <br /> • Prepare a site-specific Health and Safety Plan (HSP) for the proposed field activities. The HSP <br /> provides guidelines on the use of personal protective equipment and the health and safety <br /> procedures to be implemented during the proposed field activities. <br /> • Provide 48-hour notification to Underground Service Alert prior to job site mobilization. <br /> • Retain the services of Creek Environmental Laboratories and EMSL Analytical, Caltrans- <br /> approved and California-certified analytical laboratories, to perform the chemical analyses of <br /> soil samples. <br /> Project No.S8475-06-27 -2- April 3,2002 <br />