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City of Stockton Draft Amended Report of Waste Discharge(AROWD) Austin Road Landfill Work Plan ■ Prepare an Engineering Feasibility Study(EFS). This report will provide a description and evaluation of potential corrective actions for the off-site groundwater contamination. A recommended corrective action will be described and costed in a level of detail sufficient to begin design. ■ Design the corrective action system and prepare plans and specifications for construction. 1.2 Tasks In order to achieve the objectives described above,the Work Plan for the plume delineation program has been structured into three tasks: ■ Task 1 -Review of Existing Data. Evaluate existing site information and develop a conceptual framework of the current hydrogeologic setting and migration and fate of the VOC plume. The site conceptual framework will provide the basis for all subsequent activities. ■ Task 2-Field Investigation. The field investigation,consisting of environmental sampling and aquifer testing,is performed to reduce uncertainty in the conceptual framework. 1 ■ Task 3- Data Analysis and Reporting. The conceptual framework is refined through the interpretation of the data obtained under Task 2. Site data will be evaluated using a variety of techniques,from graphing to numerical computer modeling,to develop an improved understanding of hydrogeologic conditions and to support the design of modified corrective action measures. The Work Plan describes each of these tasks in detail,including sampling and analytical laboratory methods,quality assurance procedures,data management,and a schedule for completion of the work. 1.3 Work Plan Organization The Work Plan activities are presented by task. Following the presentation of the three tasks,a detailed schedule is provided identifying submittal dates for the technical memorandum documenting the findings in Tasks 1 through 3 and a submittal date for the Engineering Feasibility Study. 2.0 Work Plan Tasks 2.1 Task 1 - Review of Existing Data The existing groundwater quality,hydrogeologic and extraction well operational data will be assembled and reviewed to develop a conceptual framework of the current characterization of the VOC plume at the Austin Road Landfill. This framework is used as a tool for identifying the areas where data is needed to define the lateral and vertical extent of groundwater contamination. The field program,performed under Task 2,is designed to obtain information to satisfy these data requirements. The site conceptual framework,based on the initial review of existing data,consists of the following components: W:\REPORTS\STOCKTON\AUSTIN\WORKPLAN.DOC Page 2