SITE INFORMATION AND CORRESPONDENCE_1992

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-5- b. Soil and water investigation (to determine the source, nature and extent of the discharge with sufficient detail to provide the basis for decisions regarding subsequent cleanup and abatement actions, if any are determined by the Regional Water Board to be necessary) ; c. Proposal and selection of cleanup action (to evaluate feasible and effective cleanup and abatement actions , and to develop preferred cleanup and abatement alternatives ) ; d. Implementation of cleanup action (to implement the selected alternative, and to monitor in order to verify progress) ; e. Monitoring (to confirm short- and long-term effectiveness of cleanup and abatement) ; 25. Cleanup and abatement alternatives that entail discharge of residual wastes to waters of the state , discharges to regulated waste management units , or leaving wastes in place , create additional regulatory constraints andlong-term liability, which must be considered in any evaluation of cost-effectiveness ; 27. Regional 'dater Boards may impose more stringent requirements as needed to protect water quality and to reflect regional and site-specific conditions. THEREFORE BE :T RESOLVED: These policies and procedures apply to all investigations and cleanup and abatement activities of all types of discharges subject to Section 13304 of the Water Code. I . The Regional Water Board shall implement the following procedures in making decisions as to when a person may be required to undertake an investigation related to a discharge or threat of a discharge subject to WC Section 13304. The Regional Water Board shall : A. Use any relevant evidence, whether direct or circumstantial , in order to establish the existence of a discharge or threatened discharge or the source of a discharge. Any such determination must be supported by substantial evidence. There must be sufficient evidence to support the action of the Regional Water Board. Sources of evidence may include, but are not limited to, the following: 1 . Documentation of historical or current activities , waste characteristics , chemical use, storage or disposal information , as documented by public records , responses to questionnaires , or other sources of information; 2. Site characteristics and location in relation to other potential sources of a discharge;