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CAP Addendum:Former FueWg Station, 7500 West Eleventh Street, Tracy. Page i <br /> TABLE OF CONTENTS <br /> Professional Certification.....................................................................................ii <br /> 1.0 PURPOSE................................................................................................................................. 1 <br /> 2.0 RESPONSE TO TECHNICAL COMMENTS......................................................................... 1 <br /> 2.1 Recoverable Volume of LNAPL.......................................................................................... 1 <br /> 2.1.1 Apparent Thickness of LNAPL......................................................................:............. 1 <br /> 2.1.2 Thickness of LNAPL in Formation.............................................................................. 1 <br /> 2.1.3 Area of Subsurface Affected by Floating Product .......................................................2 <br /> 2.1.4 Total Volume of LNAPL in Subsurface.......................................................................3 <br /> 2.1.5 Recoverable Floating Product......................................................................................3 <br /> 2.2 Mass of Contaminants and Portion to be Addressed by Extraction Trench.........................4 <br /> 2.2.1 Existing Mass of Liquid,Dissolved and Sorbed Contaminants...................................5 <br /> 2.2.1.1 Mass of LNAPL...................................................................................................5 <br /> 2.2.1.2 Mass of Contaminants in Soil..............................................................................5 <br /> 2.2.1.3 Total Mass of Contaminants in Area Affected by LNAPL..................................6 <br /> 2.2.1.4 Dissolved Contaminants in Groundwater............................................................7 <br /> 2.2.1.5 Total Mass of Contaminants Removed from Extraction Trench...........................8 <br /> 2.2.1.5.1 Mass of Contaminants Removed by Excavation of Soil..............................8 <br /> 2.2.1.5.2 Mass of Contaminants Removed by Extraction of LNAPL.........................8 <br /> 2.2.1.5.3 Mass of Contaminants Removed by Extraction of Groundwater................8 <br /> 2.2.1.5.4 Total Mass of Contaminants Extracted...............................:........................9 <br /> 2.3 Optimal Amount of Contaminant Mass to be Removed .................................................... 10 <br /> 2.3.1 Aerobic and Anaerobic Processes of Natural Attenuation......................................... 10 <br /> 2.3.2 Solubility of Diesel and Gasoline in Groundwater..................................................... 11 <br /> 2.3.3 Relationship between Redox and Concentration of Fuel Hydrocarbons in <br /> Groundwater................................................................................................::...................... 12 <br /> 2.3.4 Importance of Removal of LNAPL............................................................................ 14 <br /> 2.3.4.1 Continuing Sources of Contaminants in Groundwater: LNAPL and Soil......... 15 <br /> 2.4 Importance of Application of the Observational Method................................................... 17 <br /> 2.4.1 Previous Successful LNAPL Removal at the Navarra Site........................................ 18 <br /> 3.0 CONCLUSIONS ...21 <br /> 4.0 REFERENCES..................................................................:....................................................23 <br /> TABLES <br /> Table 1: Thickness of Floating Product in Selected Monitoring Wells <br /> Table 2: Results of Analyses of Samples of Groundwater <br /> Table 3: Results of Analyses of Soil Samples <br /> Table 4: Geochemical Indicators of Natural Attenuation-March 2005 <br />