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William H Espev. Jr. PhD, P.E. In 2001, EC provided engineering services on the award winning Colorado River Flood Damage Evaluation Project, co-sponsored by the LCRA and the USACE. EC, through the leadership of Dr. Espey as Deputy Project Manager to the project, prepared flood frequency analyses of 16 stream gages located throughout the lower basin using HEC-FF A, performed HEC-HM:S model calibration using NEXRAlN rainfall data, and performed unsteady flow modeling using HEC-RAS. On a related project, EC was a member of the consultant team for the Onion Creek Feasibility Study sponsored by the USACE, City of Austin, Travis County, City of Sunset Valley and others. Subsequently, EC provides technical support to the City of SWlSet Valley on the project. BC recently evaluated design storms (intensity, duration and distribution) for use in the Austin nean Water Program (ACWP). The Austin Clean Water Program (ACWP) was created in November 2001 to comply with the U.S. Environmental Protection Agency (EP A) issued Administrative Order (A.O.) to eliminate Sanitary Sewer Overflows (SSOs) from the wastewater collection system. Many of the overflows are caused by surcharges on the collection system that occur during wet weather conditions when nmoff inflows, or infiltrates, into manholes and cracks in pipes. EC (Dr. Espey - Project Manager) reviewed recent rainfall data published by the USGS (1998) for use in the project, and evaluated historical storm durations and distributions in order to make a design storm recommendation to the ACWP Team. The recommendation ultimatelv included a 5-vear storm frequencY and a 6-hour storm duration. The distribution of rainfall over the storm duration was also evaluated by comparing standard distnbutions (e. g. SCS Type III, balanced, etc.) and regional historical distribution patterns in Texas. Ultimately the US Annv Corps of Engineer's Standard Proiect Storm (SPS) distribution was recommended. The hydrologic model used by the ACWP Team for this assignment is InfoWorks (also known as HydroWorks). Due to the model's apparent sensitivity to the short time intervals and high rainfall intensities, it was also recommended that the average IS-minute rainfall intensity be used as an average over the IS-minute period. Dr. Espey has also served as professional consultant and advisor to numerous public agencies. He served on a three-person committee to the Vicksburg Corps of Engineers, a member of the City of Austin's Chamber of Commerce Water Resources Task Force, appointed by the U.S. Army Corps of Engineers (Chicago) to serve as chairman of the First, Second, Third; Fourth and Fifth Lake Michigan Diversion Technical Connnittees. Dr. Espey served as the Project Principal on the Cedar Park Master Drainage Plan project ITWDB e:rant project). The project included a review of existing flood conditions, an evaluation of specific flooding areas and the development of a master drainage plan of improvements to relieve City flooding. The study area included four major watersheds: Blockhouse Creek. Buttercup Creek. Cluck Creek and Spanish Oak: Creek. In addition, Dr. Espey served as Project Principal on the Woodcreek Master Drainage Plan - Flood Control project (TWDB grant proiect). The project included development of hydrologic and hydraulic models in the delineation of flood control alternatives. Dr. Espey has been involved in various hydrologic instrumentation projects, with a background ranging from estuary, lake, large and small watersheds, including extensive urban hydrologic experience. Instrumentation has ranged from flow measurement devices (A VM), various recording systems, and supporting software combined with a variety of telecommunications systems. He specifically was involved in the initial development of the Austin flood warning system developed in response to the flood disaster of 1981 in Austin, Texas. Selected hydrologic projects in the Texas area, including four recent projects in the San Marcos area: . Cottonwood Creek LOMR - San Marcos, Texas . Blanco River LOMR - San Marcos, Texas . Hunter Hill Subdivision, Hydraulic Analysis - San Marcos, Texas . Travis School Hydraulic Analysis - San Marcos, Texas . City of Austin Master Drainage Plan/Study 1974-76 · Lake Austin Master Plan with Wallace, McHart, Meltary, Robert, and Todd. . Barton Creek Watershed Master Plan Phase I and IT . Shoal Creek Master Drainage Plan Espey Consultants, Inc. Exhibit A, Page 63 Page 2 of3