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• 5.5 Workplan <br /> Prior to initiating any additional site investigation activities, <br /> preparation of a detailed workplan is recommended. The workplan <br /> should describe all proposed sampling efforts as well as proposed <br /> methods and procedures . It is recommended that the workplan be <br /> submitted to the Central Valley Region, Water Quality Control Board <br /> for approval. <br /> 5.6 Summary <br /> Site remediation without additional investigation is recommended <br /> for soil contamination under the aircraft washpad. Following <br /> demolition and removal of the washpad, soil remediation by <br /> excavation is recommended. Verification of remediation <br /> effectiveness by collection and analysis of soil samples is <br /> proposed. <br /> Further sub-surface site investigation is recommended for the <br /> clarifier and discharge pit study areas . Definition of contaminant <br /> extent by soil boring and sampling with a powered, hollow--stem <br /> auger is recommended. If soil contamination is followed to <br /> groundwater installation of a monitoring well is proposed. <br /> Survey and collection of additional storm drain sediment samples is <br /> also recommended. Careful analysis will be required to verify if <br /> contaminants encountered originated at the AASF aircraft washpad. <br /> 21 <br />