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California Regional Water Quality Control Board °t Central Valley Region 3 . Robert Schncldcr,Chair .. 'ferry"1'>tmmincn Arnold Serretoryfor Sacramento Main Office SchwttrccncuKer Gnvironmenlat 11020 Con Center Drive M200,Ranchs Cordova,Califurnia 95670-6114 Governor Prorecrion Phone(916)464.3291 •FAX(916)464-4645 hop://www.swrcb.ca.gov/rwycbS Guidelines for Submittal of Information I)cvcloped from Models to the Central Valley Regional Board Models can be necessary in water quality studies and investigations to predict future conditions uf'thc ground or surface waters, or to examine critical or"worst case"conditions which cannot be directly measured without waiting indefinitely for those conditions to naturally occur. Although often necessary, models can easily be miss-applied or misused. It is the responsibility of the Discharger or project proponent to demonstrate the appropriateness and usage of the model so that the Board and the public can fully understand the modeling process and understand the strengths and weakness of the model output. It is highly desirable for the model to be"transparent", that is, fully open to scrutiny. Proprietary models, because all or part of the model is"hidden" from review, have a higher burden of proof because it is more difficult to have a complete understanding of the modeling process for proprietary models. . The following is a list cif general concepts applicable to all modeling that generally need to be demonstrated by the modeler before the Regional Board can accept a model for use. This list is provided for general guidance only. Specific applications of models may require different justification. It is strongly recommended that all modeling be discussed with appropriate Regional Board staff before the modeling is conducted so that all parties understand the modeling process. At a minimum, items I through 9 should be discussed and agreed to prior to commencement of the modeling effort. 1. What is the modeling objective? What is being modeled, why that information is needed, and how will the results be used? 2. What model has been chosen'l(Name, author, version, etc.) 3. Why is the chosen model applicable to this situation? 4. is the model open or proprietary'? What level of peer review has been done on the model? Provide examples of previous use of the model. S. If the model is proprietary, explain why open models or EPA-approved models are not appropriate for the application. It may be appropriate to ask for an independent peer review of the computer code of a proprietary model. 6. Describe the underlying fundamentals and assumptions of the model and why they are appropriate. California Environmental Protection Agency ce Recycled Paper The enerbry challenge facing Calit'ornin is real. Every Cu1irouti;ut nee.ds to lake immediate action to reduce energy consumption. For a list:u1•simple ways you can reduce demwid and cut your energy costs,see our Wch-site at hltp://www,swrch.ca.gt)vliw[IehS