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Tri Regional Recommendation Page 21 of 24 Appendix A 9. Provide tabulated results of all groundwater 6.6 NFAR Documentation elevations and depths to water. The purpose for a NFAR request report is to 10. Provide tabulated results of all sample provide a document upon which the regulator may analyses, including the sampling method make an objective decision regarding the and detection limits. Analytical results requested closure. At a minimum,the NFAR must include TPH and BTEX constituents, request must include the information outlined lead,MtBE,EtBE, TBA, ETBE,DIPE, below. Responsible parties are to provide a one TAME, ethanol,methanol, ethylene or two sentence narrative summary for each dibromide, 1,2-dichloroethane and other numbered item below, and list the section number constituents as indicated in Table#2 above. where supporting information can be found in the Provide any WET or TCLP results. NFAR request. Additional information submitted, such as fate and transport modeling,must include 11. Discuss concentration and mass changes the assumptions and variables used. The NFAR over time, and current concentrations of request must include signatures of registered contaminants remaining in groundwater at professionals as required by the California the site. Business and Professions Code. 12. Provide isoconcentration contour maps of 1. Site history and current site conditions. contaminants of concern to define the lateral and vertical extent of contaminants 2. Site geology and hydrogeology. remaining in soil and groundwater. The contour maps should present an estimated 3. Sensitive potential receptors including "zero line"of contaminant concentrations water supply wells and surface water. both on-site and off-site. 4. Provide a map showing the location of all 13. Provide a summary of the remedial water supply wells used for municipal, method(s)used to clean up the site. Include domestic, agriculture, industrial and other the calculated zone of influence, uses within 2,000 feet of the site. Provide assumptions used to design the remedial well details and distances in a table. system(s), and the duration of remedial activities. 5. Provide scaled site maps of the area impacted showing locations of former and 14. Provide a discussion of whether existing tank systems, excavation and background is unattainable using best sample locations,boring and monitoring available remediation method(s). well locations, groundwater elevation contours, subsurface utilities,buildings, 15. Provide a discussion(and estimate) of streets, and any nearby surface waters. contaminant mass remaining in soil and groundwater versus contaminant mass 6. Provide boring logs and cross-sections to removed or destroyed by soil excavation or show site lithology. remedial actions. 7. Report the volume of excavated soil 16. Provide assumptions,parameters, disposed off-site, or remaining on-site. calculations and the model used in any risk assessments. 8. Describe the fate of any remaining monitoring and remediation wells 17. Provide assumptions,parameters, (destroyed, ownership transferred, or to calculations and the model used in fate and remain in use). transport modeling.