25E - AGMT WATER ENGINEERING CONSULTING

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Bob Ohlund, PE Principal in Charge Bob Ohlund is Vice President of Dudek and has more than 33 years' engineering consulting experience focused on developing creative and sustainable solutions for public infrastructure. Mr. Ohlund is an expert in water, wastewater, and recycled water resource projects, serving in program management, project management, and construction management roles. His leadership in planning, design and construction of new facilities and rehabilitation of existing facilities has culminated in many successful projects. EDUCATION University of Southern California BS, Civil Engineering, 1983 CERTIFICATIONS Professional Civil Engineer, CA No. 41006 PROFESSIONAL AFFILIATIONS American Water Works Association (AMA) since 1963, #0081539 Water Environment Federation (WEfTEC), #01786979 Project ExperienceAmerican Society of Civil Engineers I (ASCE), #424585 Artificial Circulation Systems for Mathis Reservoir and Orange County Water Association, 1983 - Bear Brand Reservoir, Moulton Niguel Water District, present; Board of Directors (1994-2000); California. Project manager for the design of an artificial I President (2000) circulation system In Mathis Reservoir and Bear Brand Reservoir. The circulation system included the installation of a motor driven submersible mixer. This mixer consisted of large "banana blade' propeller driven by a 3.5 horsepower motor, mounted on a mast allowing for removal and installation of the mixer, without taking the reservoir out of service. The mounting system was structurally designed to complement the existing steel tank's internal structural features. A new hatch was provided in the roof of the reservoir over the mixer, complete with a davit crane to facilitate removal and installation. In addition, seven sampling ports, tubing, and valving were designed to facilitate the Moulton Niguel Water District's confirmation of water quality within the vertical scope of the reservoir. Aeration and Electrical Upgrades, Muirlands Wastewater Treatment Plant, Los Alisos Water District Aeration units in Lagoons Nos. 2 and 3 were added to increase the dissolved oxygen to enhance the lagoon performance in the secondary treatment process. Electrical power service was designed to accommodate the ultimate aeration requirements of the lagoons. Zone 4 and 6 Reservoirs Artificial Circulation Evaluation, Irvine Ranch Water District, California. Project manager for the evaluation of inducing artificial circulation or mixing of stored water in an attempt to increase water quality in the system. Baffles, submersible mixers, and alternative operational scenarios were evaluated with cost estimates, and present worth analyses were used to quantify the costs and benefits. In addition, computer modeling using computational fluid dynamics of the preferred mixing alternatives was performed to evaluate the effectiveness of the alternatives to support recommendations for the improvements. North Trumble Recycled Water Storage Ponds, Eastern Municipal Water District, Perris, California. Project Manager for the design of two new recycled water ponds that will provide the District with approximately 1,500 acre-feet (489 million gallons) of additional seasonal storage capacity. Coordinated special studies, including geotechnical investigations to further characterize the groundwater conditions and is evaluating several potential means and methods for a concentrated dewatering operation in the proposed excavation area, thereby avoiding the need to drain the existing pond for the duration of construction 25E-48