Crews are working to clean up a diesel spill at a park in the North Natomas area of Sacramento. The spill happened at Tanzanite Park, near Interstate 80 and Interstate 5. The park is shut down during the cleanup. A report from the Office of Emergency Services shows a 10,000-gallon tank had a "malfunction," and the diesel was released onto the concrete loading dock and into a storm drain. "It came from a storage tank up slope, up stream that had a 10,000 gallon capacity," said Ryan Hanson with the Department of Fish and Wildlife. "We don't have the exact number yet but several thousand gallons has been reported to us as missing."The Office of Spill Prevention and Response is leading the cleanup efforts which began at sunrise Tuesday. The spill originated about a mile north of the park at the Centene Corporation on East Commerce Way.The property management company, Hines, said the spill happened on the loading dock and it's working with the state to help clean up the storm drains and lake.In a statement, Hines said, "At this time, a team is working diligently to clear and clean the storm drains on the property and address areas potentially affected by the storm drains. In doing so, we are working closely with the County, the California Department of Fish and Wildlife, and the Office of Emergency Management to resolve these issues. We will provide updates as the work proceeds under proper regulatory oversight.” The source of the leak has been stopped. Wildlife care specialists with the Oiled Wildlife Care Network of Cordelia are on the scene and have already rescued at least two birds that are being treated at the San Francisco Wildlife Care and Education Center.The specialists are walking along the banks and park looking for other birds and wildlife affected by the spill. "It affects their feathers primarily which impacts their ability to thermos regulate so they preen a lot which means they are ingesting oil while they are cleaning their feathers," said Greg McGowan with the wildlife branch of the Office of Spill Prevention and Response. Neighbors said the park is usually filled with gaggle of geese and migratory mallards and other birds. There are also turtles and beavers that live around the lake. "We will continue to do reconnaissance, looking for birds, looking for behavior that is abnormal and other wildlife in the pond," McGowan said.The Office of Health Hazard and Assessment will test water samples to see if there is any danger to the fish in the lake.The Sacramento Fire Department is testing the air quality in the area because the spill happened near a neighborhood.Crews will continue the cleanup Wednesday morning.