An analysis by state regulators shows new rules for oil and gas drilling near Colorado communities might have only limited impact, affecting as few as 1 percent of future sites. The Colorado Oil and Gas Conservation Commission, which regulates drilling, is hold hearings on the proposals in Denver. The rules would give local governments a consulting role when energy companies want to put big facilities near neighborhoods and businesses. Regulators would have more authority over such facilities. The rules would cover sites with multiple wells or storage tanks. The regulations were designed to address conflicts that arise when Colorado’s growing cities and oilfields expand into each other. Proponents of tighter regulations said the rules are too weak, but energy companies say they’re too restrictive.