This Reasonable Assurance Analysis (RAA) Guidance Document describes the background, requirements, and recommended approach for conducting RAAs for programs and permittees subject to the Municipal Regional Stormwater Permit (MRP) (Order No. R2-2015-0049). For the purposes of this Guidance Document, an RAA is a demonstration that the control measures proposed in the MRP Permittees’ Green Infrastructure Plans and Polychlorinated Biphenyls (PCBs) and Mercury Control Measure Implementation Plans (see Section 2.1.3) as required by MRP Provisions C.3, C.11, and C.12, will meet the PCBs and mercury Total Maximum Daily Load (TMDL) wasteload allocations for urban stormwater runoff.