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1 1.0 INTRODUCTION <br /> ' American Geological Services, Inc. (AGS) has developed these Standard Operating Procedures <br /> (SOPs) and stringent Quality Assurance and Quality Control (QA/QC) procedures for all project <br /> activity. These QA/QC procedures insure that a high level of confidence is maintained on all <br /> ' collected data, and the conclusions and recommendations derived from this data. American <br /> Geological Services, Inc. believes that it is extremely important to collect as representative a <br /> sample as possible and to describe that sample thoroughly at the time and place of collection. <br /> 1 This document summarizes the SOPs and QA/QC procedures proposed by AGS for work at the <br /> Tracy Cold Storage site. These procedures contained in this document and the attached forms <br /> ' should be considered proprietary and confidential. <br /> Prior to the beginning of field data collection the Quality Level of the project investigation must <br /> be determined. The importance of the field and analytical data relative to the risks of the study <br /> determine the Quality Level required. General descriptions of the Quality Levels are listed <br /> below: <br /> Quality Level 1: Projects with relatively low risk involving a simple scope, narrow focus, and <br /> low budget, such as preliminary assessments. <br /> Quality Level 2: Projects related to hazardous waste sites, waste supply development, permit <br /> ' applications, Remedial Investigations and Feasibility Studies, and enforcement cases. <br /> Quality Level 3: Projects with high risk which will be intensely scrutinized such as waste <br /> ' management facilities, power plants, and enforcement cases. <br /> Stringent steps are taken to ensure that all field and analytical data are complete and accurate. <br /> ' The following procedures are utilized with all data: <br /> ' Verification: All field and analytical data entered into data bases or various software <br /> applications are verified with the original field and analytical sheets, and that these entries <br /> fall within the range of valid values. <br /> ' Validation: Comparison of data to nearby sample intervals, sample duplicates, or sample <br /> replicates to ensure that highly skewed data are noted and qualified during interpretation. <br /> For projects involving the collection of a large number of samples from the same media, <br /> such as a soil grid, an Analysis of Variance will be conducted. <br /> American Geological Services, Inc. <br /> 1 <br />