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Report on Additional Site Assessment <br /> 7-Eleven Inc.,Store#19976 1399 N.Main St.,Manteca,California March 5 2001 <br /> CONTENTS <br /> 1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 <br /> 2.0 BACKGROUND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 <br /> 3.0 ADDITIONAL SOIL AND GROUNDWATER ASSESSMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 <br /> 3.1 Permitting/Site-Specific Health and Safety Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 <br /> 3.2 Soil Gas Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 <br /> 3.3 Soil Borings and Soil/Grab Groundwater Sample Collection . . . . . . . . . . . . . . . . . . . . . . . . 5 <br /> 3.4 Groundwater Monitoring Well Installation/Surveying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 <br /> 3.5 Groundwater Monitoring and Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 <br /> 4.0 RESULTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 <br /> 4.1 Geology and Hydrogeology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 <br /> 4.2 Soil Gas, Soil Sample, and Grab Groundwater Analytical Results . . . . . . . . . . . . . . . . . . . 8 <br /> 4.3 Groundwater Monitoring/Analytical Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 <br /> Figures <br /> 1. Site Location Map <br /> 2. Soil Gas Survey/Soil Boring and Additional Monitoring Well Locations <br /> 3/3A. Dissolved Hydrocarbon Concentration and Potentiometric Surface Maps(10/12/00) <br /> Tables <br /> 1. Soil Gas Survey Data <br /> 2/2A. Results of Soil Sampling Analysis/Grab Groundwater Results <br /> 3. .Groundwater Monitoring and Analytical Data <br /> Appendices <br /> A. Drilling Logs <br /> B. Survey Data <br /> C. Field Data Sheets <br /> D. Laboratory Reports and Chain-of-Custody <br /> 19976.4SA <br />