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REDUCTIONS IN WATER USE Stage Overall Reduction Voluntary or Mandatory Up to 20% Voluntary 2 Up to 20% Mandatory 3 Up to 35% Mandatory 4 35%or more Mandatory 9.30.070 Calculation of customer reduction in water use. A. When a water shortage is declared with mandatory reductions in water use, the director shall impose the applicable stage of mandatory reduction by calculating customers' average usage for the same billing period from 1 to 4 prior years, as data is available. If sufficient historic usage information is not available, the director may base water use allocations on a combination of the limited historic usage data available, per-capita water use targets, water usage from similar customer types, and other activity-specific water usage data. B. Usage of water in excess of a customer's mandatory conservation amount is subject to excess use penalties in Section 9.30.100. 9.30.080 Conservation Measures. The following conservation measures are applicable for normal supply, and the declared water shortage stage(s) indicated: A. Level: Normal Supply. To protect and preserve the community water supply the elimination of wasteful water uses is essential at all times, regardless of water supply level. Pleasanton customers shall observe the following regulations on water use: 1. Use potable water for irrigation of landscape in a manner that does not result in runoff or excessive flooding on patios, driveways, walkways or streets. 2. Schedule regular irrigation of lawn and landscape between the hours of 6:00 p.m. and 9:00 a.m. the following day. Watering is permitted at any hour if a hand-held nozzle or drip irrigation is used. Special landscapes are exempted. 3. Limit the use of water for washing sidewalks, walkways, driveways,patios, or other hard- surfaced areas to prevent excessive runoff or waste. 4. Use water for mobile or machinery washing, preferably from a hose equipped with a shutoff nozzle, in a manner that does not result in excessive runoff or waste. 5. Repair potable water leaks from breaks within the customer's plumbing system within eight hours after customer is notified or discovers the break. 6. Reduce other interior or exterior uses of water to minimize or eliminate excessive runoff or waste. 7. Restaurants are requested to serve water to their customers only when specifically requested. B. Level: Stage 1 —Up to 20% Voluntary Reduction. There is sufficient uncertainty concerning water supplies for this year or in the next few years that it would be prudent to conserve local water supplies so that these supplies may be used to meet water demands in future years. The following restrictions shall be applicable during a Stage 1 activation of the water shortage contingency plan: 1. All of the normal supply level restrictions, in Section A, above, shall continue to be mandatory during Stage 1.