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<br />002498 <br /> <br />Rawinsonde soundings should be conducted through the operational <br />period at two hourly intervals, starting at the beginning of the <br />operational period. The soundings would be used to monitor the <br />behavior of thermal strata during the operation. These provide <br />accurate measurements of the -50C isotherm for seeding purposes, <br />and further measure wind speed, wind direction, and vertical <br />thermal structure for operations and subsequent analysis. <br /> <br />, <br />r <br /> <br />Acoustic echo sounder measurements are also recommended. These <br />would be primarily intended to monitor thermal inversions on a con- <br />tinuous basis as they change and occur. The records should be <br />immediately available to provide a description of the prevalent <br />situation; for this purpose, remote data transmission to the project <br />office would be advisable. A minimum of three sounders around the <br />area are proposed. Reasonable locations appear to be Roseville, <br />Auburn, and Placerville, California. <br /> <br />f <br />Ii <br />t <br />~ <br />~ <br />e <br />" <br /> <br />Precipitation systems would be checked, during the alert period. The <br />project meteorologist would closely monitor the precipitation telemetry <br />system to ensure that adequate data suitable for subsequent analysis <br />will be available. <br /> <br />Thus, this section of operational procedures outlines a proposed <br />sequen~e of events prepared as part of the MBA's analysis. <br /> <br />Suspension Criteria <br /> <br />MBA assigns particular significance to the creation of a special <br />working group during Phase II of its study to develop program <br />suspension criteria. This group included members of the MBA staff, <br />Bureau of Reclamation reservoir operations personnel, representatives <br />of the Forest Service including the Pacific Southwest Forest and <br />Range Experiment Station, and the Sacramento River Forecast Center. <br />The group brought together specific expertise in those aspects of the' <br />program that could lead to hazards or detrimental resu1ts. The <br />group's activity continued until a concensus was reached on sus- <br />pension criteria to minimize the possibility of a negative result <br />from the program. <br /> <br />The criteria for temporary suspension of the cloud seeding program <br />gi ven .here are based on des i gn study cons i derati ons. These will be <br />combined with criteria relating to socio-environmental concerns to <br />formulate the final suspension criteria. MBA's suggested criteria <br />for temporary suspension are: <br /> <br />I <br />~ <br /> <br />"Flood Conditions: Whenever encroachment on the reservoir <br />storage volume allocated to flood control storage exceeds <br />25 percent of total, resulting in very high spill rates. <br />These conditions would be monitored by the Bureau of <br /> <br />23 <br />