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Tri-Regional Recommendations Page 14 of 24 w, Appendix A 3 Hydrographs and plots of chemical con- centrations versus time for each monitor- Investigations and characterization activities are ing well that has had detectable levels of to be presented accurately in the PAR, and contaminants should include the following minimum informa- tion 4 An estimate of the quantity of contami- nants remaining in soil and groundwater . The depth and extent of free product found, including an estimate of volume 5 The anticipated date for completion of removed and volume remaining cleanup activities • Figures delineating lateral and vertical ex- 6 An identification of any data gaps and po- tent of soil contamination,groundwater tential deficiencies/redundancies in the degradation plume(s), and vapor plumes monitoring system or reporting program as appropriate 7 A proposal and rationale for any neces- • Tables summarizing analytical data such sary revisions to the groundwater sam- as compound concentrations found in soil pling plan and/or list of analytes and groundwater, and sample depth • An evaluation of the physical and chemi- 4 0 CORRECTIVE ACTION PLAN (CAP) cal charactenstics of the hazardous sub- _ 272$ stance or its constituents, including its toxicity,persistence and potential for mi- Once the lateral and vertical extent of soil and gration in water, soil, and air groundwater degradation is defined, the dis- charger is to proceed with the CAP The CAP is • An estimate of the mass of contaminants separated into the Problem Assessment Report remaining in soil and groundwater (PAR),the Feasibility Study (FS), and the Final Remediation Plan(FRP) At every step of the • Identification of applicable cleanup levels CAP,the lead regulatory agency will review for affected or threatened groundwater submitted documentation, and direct the dis- and surface water, and a rationale for re- charger to proceed with proposed actions,or lecting these levels modify these actions to meet regulatory compli- ance for protection of water resources, health Note Cleanup levels for leaking under- and safety, and sensitive ecological receptors ground storage tanks sites are based on until the FRP is successfully implemented and regulatory requirements as presented in no further action is required at the site State Water Board Resolution 92-49, Poli- cies and Procedures for Investigation and 4 1 Problem Assessment Report(PAR) Cleanup and Abatement of Discharges under California Water Code Section The PAR summarizes the PIER and all addi- 13304, and Water Quality Control Plans tional investigations that characterize the site of the Central Valley Region, including The PAR should include sufficient detail on the "Policy for Investigation and Cleanup of nature and extent of the contamination to pro- Contaminated Sites" vide a basis for future decisions regarding sub- sequent cleanup and abatement actions The Cross sections based upon boreholes, discharger is to propose site-specific cleanup monitoring wells, trenches, and support- goals, and identify available remedial alterna- ing geological mapping logs tives that have a substantial likelihood to achieve cleanup goals and objectives 6A site map showing sensitive receptors