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<br />EXHIBIT A <br /> <br />DRAFT <br />Recycled Water Irrigation System Scheduling <br /> <br />Summary <br /> <br />This proposal is for performance testing of recycled water irrigation systems in Redwood Shores <br />landscapes. Irrigating with recycled water requires more precision due to the higher salt loading than <br />potable water. This is a problem for customers who must correctly apply irrigation water to their <br />landscapes. Data developed from this study will help create better irrigation schedules for customers to <br />use. <br /> <br />Goal <br /> <br />To provide information allowing customers to properly schedule irrigation for the five recycled water <br />sites having the most trouble maintaining good landscape appearance. <br /> <br />Strategies <br /> <br />1. Determine the extent of potential soil related problems with recycled irrigation water. This step will <br />include evaluating the necessity and value of leaching fractions required to limit salinity <br />accumulations. Another consideration is the potential for buildup of water tables which could <br />increase the salinity hazard. <br /> <br />2. Test existing irrigation systems, collect performance data and ascertain if limitations for the use of <br />recycled water exist. Criteria might include low distribution uniformity which potentially can <br />exacerbate salinity issues. <br /> <br />3. Calculate irrigation schedules for all stations at a site controller-by-controller. These would include <br />easy-to-use strategies that will help landscape contractors implement and maintain the schedules <br />through the changes in seasonal water demands. <br /> <br />4. Provide schedules to customer. Revise and optimize schedules according to results from continuing <br />soil tests and landscape appearances. <br /> <br />5. Continue with scheduling assistance. Maintenance of implemented schedules is necessary to receive <br />full benefits of accurate scheduling. <br /> <br />Scope of Work <br /> <br />1. F or the five target sites, contact customer( s) to arrange site testing. <br /> <br />2. Review extant soil test results and determine irrigation strategy. <br /> <br />3. Test site irrigation system using catch either the cup or flow/area methods as needed for the <br />specific irrigation equipment. Sample areas of the system will be tested and the balance of the <br />site scheduled by linking to the test stations. <br /> <br />4. Using performance measures of the distribution uniformity and precipitation rates, calculate <br />irrigation schedules for all site controllers and stations. <br /> <br />5. Help customer(s) implement and maintain schedules. <br />8 <br />