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C. Nonflow Related Activities Nonflow activity related changes from the without fish scenario aze those that stem from activities generated by oil and gas operations, mining operations (sand and gravel), construction (recreation-and/or private dwellings), and the stocking of nonnative fishes. These are activities that might well impinge upon the recovery of the endangered fishes. 1. Oil, Gas, and Other Drilling Activities Significant amounts of oil and gas have been developed in the Colorado River Basin. Little, however, is known regazding the effects of proposed critical habitat designation on this production. The impacts to society of the additional cost of production resulting from listing or critical habitat designation would be measured by a permanent loss of production. A marginal production facility that is closed due to increased monitoring costs represents a loss of production in the short term. Thus, the critical determination for well-related impacts resulting -from contaminants is what percentage of producing wells will be capped and what percentage of the actual production will truly be lost to society. For purposes of this report, given the lack of available information, oil and gas impacts were assumed to be zero in the seven-State region. 2. Nonnative Fish Stocking and Fish Program A questionnaire was designed to determine the effects of critical habitat designation on the stocking and fishing programs in the seven-States area. Nonflow effects on these programs were determined through the use of personal interviews with State game and fish personnel.3 3. Other Impacts Other activities potentially impacted include sand and gravel operations, the construction industry, and public recreation facilities. No data were available for the effects on sand and 3 There was a section of the survey that focused upon flow effects of the stocking program and these results were incorporated into the recreation analysis. . I-25