Overview of Qualifications: Water Resouce Planning Services Apr 2003

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Sample Water Resources Projects - Continued Water Storage Projects carryover the average to wet year supplies for delivery to the cities' customers in drought years. More than 180 on- stream and off - stream reservoir storage sites were initially identified and evaluated. Many of these sites involve the enlargement of existing surface reservoirs. Ground water storage and the use of extensive gravel pit operations along South Platte River tributaries were also investigated as were several options involving new institutional arrangements with other water users to provide access to their existing storage. A computer model, the Boyle Engineering Streamflow Simulation Model (BESTSM) was used to develop a new model of the C -BT and Windy Gap systems, which is also consistent in approach with the State's Colorado Decision Support System (CDSS). This application of BESTSM was used to analyze the firm yield of several WGFP alternative plans, and evaluate the integrated operations of the C -BT and Windy Gap Projects. In addition to evaluating the drought yields of the many alternatives, the Boyle team also evaluated potential construction costs of the associated dams (up to 300 feet high), water conveyance pipelines (up to 40 miles long), and major pumping stations. Environmental characteristics were also evaluated for each of the alternatives including potential effects on threatened and endangered species, wetlands, existing land use, cultural resources and many other factors. Boyle Engineering has been involved in water storage and conveyance projects for the past three decades and has prepared designs and analyses for more than 100 dams and reservoirs with structures ranging from 10 feet to more than 300 feet high. Boyle is the designer of projects such as the 120 - foot -high Wolford Mountain Dam, the 139 - foot -high, 1,300 -foot crest Grindstone Canyon RCC dam in New Mexico, and the original 140 -foot high Olivenhain Dam in California on which we are now reviewers of the 308 - foot -high dam being built on the same site. The company's current dam projects also include rehabilitation of smaller projects and complex reservoir operation studies to cooperatively manage multiple reservoirs on major stream systems. San Dieguito Reservoir Rehabilitation Study The Santa Fe Irrigation District and San Dieguito Water District get a portion of their water supply from the City of San Diego's Lake Hodges. As Lake Hodges is a much more cost effective source than the alternative, purchase of imported water, the Districts sought to improve the system's reliability, yield, quality, and emergency storage. The existing system consists of the 33,000 -af Lake Hodges, an 800 -af terminal reservoir at the site of their filtration plant, -15- NOVLE