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ATTACHMENT A Mokelumne River Fish Facility Improvements Project Description The Mokelumne River Fish Hatchery Project will renovate and expand the administration building and the production capacity of the hatchery. These facilities were constructed in 1964, modified over the last 30 years, and now require upgrading to meet current CDFG production goals and hatchery management practices. The proposed work includes demolition of most existing structures over a 4 acre site which were designed around a spawning channel application and have deteriorated after 30 years of intensive use. The new facility will be designed around the existing adult holding pond/egg take operation which was installed in 1994. A new 5,900 square foot combined administration, freezer and shop building is proposed to house up to nine CDFG hatchery staff. The proposed improvements are estimated to have a construction value of$9.5 million, excluding design and construction management services. Major features of the proposed plan can be seen in the attached site plan. Fish grow-out takes place in 60 raceways, arranged three per series,that are enclosed with a bird exclosure for predator control. Improvements to the water system include packed column aerators at the head end of each series, modifications to the existing potassium permanganate injection and sand filtration systems, hookups for a temporary chiller system, and an aeration tower for the hatchery building water supply. An existing well will be developed to supply up to 400 g p.m. ofground water for domestic water supply to the new administration building and to supplement the hatchery building supply. An area will be provided for temporary compressed oxygen that may be used during drought conditions when dissolved oxygen levels are low in the hatchery water supply. The existing earthen channels and vegetation will be used to treat wastewater from raceway cleaning, similar to the existing raceway wastewater treatment system. The new administration, freezer and shop building will include floor and window coverings and will have an area to receive visitors, including bathrooms. Two chemical storage buildings will hold herbicides and flammable materials. The existing hatchery building and adult holding ponds that were completed in 1994 will be modified to improve the spawning area and fish handling in the holding ponds. New employee parking will be integrated into the site plan. The existing visitor parking lot will remain in its existing conditign. All new facilities will meet State of California Title 24 requirements for the disabled. Materials Produced Stored or Used Materials Produced: The facility will produce fingerling and smolt steelhead and salmon that are released into the lower Mokelumne River system and into the San Francisco Bay. Materials Stored& Used: The facility will store and use fish food, petroleum products, herbicides, compressed oxygen, and fish culture chemicals including formaldehyde. An exisitng 1,000 gallon above-ground fuel storage tank contains diesel fuel and gasoline for vehicle use. Separate chemical storage buildings will store motor and lubricating oils, 50 gallons of herbicides (Round-up-and Rodeo), and 110 gallons of formaldehyde. W\W"RO=S�A=O