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r <br /> Fortner Beacon Station No. 12474 March 18,2002 <br /> Stockton California Problem Assessment Re ort/Corrective Action Plan <br /> L° <br /> • TABLE OF CONTENTS <br /> 1.0 INTRODUCTION ............................................................................................................. 1 <br /> 2.0 SITE DESCRIPTION AND PREVIOUS INVESTIGATIONS .......................................2 <br /> 3.0 REGIONAL AND LOCAL HYDROGEOLOGY...........................................................4 <br /> 4.0 SENSITIVE RECEPTOR SURVEY AND WELL SEARCH .......................................... 5 <br /> 5.0 PROBLEM ASSESSMENT..............................................................................................6 <br /> 6.0 MASS OF PRETROLEUM HYDROCARBONS IN SOIL AND GROUNDWATER.... 8 <br /> 7.0 FEASIBILITY STUDIES ................................................................................................ 11 <br /> 8.0 REMEDIATION ALTERNATIVES............................................................................... 13 <br /> 9.0 REMEDIATION OBJECTIVE OPTIONS...................................................................... 18 <br /> 10.0 PROPOSED CORRECTIVE ACTIONS.......................................................................20 <br /> 11.0 DISTRIBUTION..............................................................................................................23 <br /> 12.0 LIMITATIONS.............................................................. ............... 24 <br /> 13.0 REFERENCES ................................................................................................................24 <br /> FIGURES <br /> FIGURE 1: SITE VICINITY MAP <br /> FIGURE 2: SITE PLAN <br /> FIGURE 3: GEOLOGIC CROSS-SECTION A-A' <br /> FIGURE 4: GEOLOGIC CROSS-SECTION B--B' <br /> FIGURE 5: GROUNDWATER CONTOUR MAP <br /> FIGURE 6: APPROXIMATE LATERAL EXTENT OF TPHg AND BENZENE IN SOIL <br /> FIGURE 7: TPHg IN GROUNDWATER ISOCONCENTRATION MAP <br /> . FIGURE 8: BENZENE IN GROUNDWATER ISOCONCENTRATION MAP <br /> 474PARCAP3-02.doc ii <br /> Project No. 1474.23 HORIZON ENVIRONMENTAL INC. <br />