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Quality Assurance and Ouality Control Procedures QA/QC measures will be performed for each method of analysis with specificity for each analyte listed in the test method's QA/QC. QA/QC measures will include the following: • One method blank for every ten samples, batch of samples or type of matrix, whichever is more frequent. • One sample analyzed in duplicate for every ten samples, batch of samples or type of matrix, whichever is more frequent. • One spiked sample for every ten samples, batch of samples or type of matrix, whichever is more frequent,with the spike made at ten times the detection limit or at the analyte level. • One equipment blank for every chain of custody obtained by pouring deionized water over the sampling device and into a laboratory container. Report Preparation A Site Investigation Report will be prepared to present the findings and conclusions of the investigation. The report will include but not be limited to the following: - Investigative Summary - Project Description - Investigative Methods - Investigative Results and Field Observations - Data Evaluation and Discussion - Conclusions and Recommendations - At Caltrans discretion, submit a Remedial Action Options Report providing general discussion regarding applicable soil remedial alternatives and cost analysis - Appendices including boring logs, permits, geophysical and laboratory reports, and chain- of-custody documentation - Vicinity Map and Site Plan depicting boring locations Caltrans will be provided with one copy of the draft report. Upon receipt and incorporation of Caltrans comments, Geocon will provide five copies of the finalized Site Investigation Report. Project Schedule The following project schedule will be adhered to weather permitting: Task Completion Date Field Work May 13, 2003 Draft Report June 19, 2003 Final Report June 30,2003 Project No.S8475-06-70 -4- April 30,2003