County Board of Supervisors. Meets Tuesday. 9 a.m. County Government Building, 1055 Monterey St., San Luis Obispo. 781-5011. On the agenda: Discussion about seismic testing off Diablo Canyon nuclear power plant; change in operating agreement with State Parks that could lead to entry fees at Montaña de Oro State Park; request from Jack’s Helping Hand for $532,000 for Jack Ready Imagination Park in Nipomo; discussion of effects on the county budget of various Nov. 6 state ballot propositions.