Gov. Jerry Brown’s administration gave the official go-ahead Friday for his controversial plan to bore two huge tunnels beneath the heart of Sacramento-San Joaquin Delta. The state Department of Water Resources said it had finalized the lengthy environmental review of the $17.1 billion Delta tunnels project, officially known as California WaterFix. In what’s known as a “Notice of Determination,” regulators said building and operating the tunnels complies with the California Environmental Quality Act and won’t harm fish, wildlife or human health.