site. After the 2003 HRA Greka was able to reduce emissions both for cancer and non-cancer risks to "non-significance" by removing some of the engines. As a result, SBCAPCD no longer considers the Zaca field to be a significant risk facility. However, several oil spills from facilities on the field brought Greka media attention. In 2007, Greka paid a fine of $17,500 for a tank leak at the Zaca field in which oil and produced water reached Zaca Creek. Another more significant spill occurred on January 5, 2008, during a rainstorm. During this event, between 800 and 1200 barrels of crude oil, and a larger amount of produced water, escaped from a storage tank through a damaged pump. Of this amount, an initially estimated 20 barrels of crude oil and 50 gallons of produced water breached the secondary containment berm and entered Zaca Creek. The U.S. EPA became involved in the incident in February 2008, issuing an order to Greka to clean up the spill pursuant to the Clean Water Act, since the spill was still present in the creek three weeks after the initial event, and had fouled the creekbed for more than a mile downstream. California Department of Fish and Game estimated the total spill amount to have been 1200 barrels of crude oil. However, Underground Energy has had a clean environmental compliance record and safety reports since they became the operator of the "Zaca Field Extension Project" in November 2011. Production and operations As of the beginning of 2009, there were 30 active oil wells on the site, with another 16 shut in. Twelve wells were on the Monterey North Block and 18 on the South Block. Daily production was 7.6 barrels of oil per well in 2009, with an average water cut (the percentage of water in the total fluid pumped from the well) of 96.9 percent. Oil from the field is treated onsite at a small processing facility on the Davis Lease, consisting of heaters, an oil-water separator, and storage tanks. Gas from the field is used as fuel onsite to heat the oil in the tanks and power the pumping units. Excess gas is flared; none leaves the site. Sulfur is scrubbed from the gas prior to use. Water separated from the oil is reinjected into the producing formation, where it serves as a flooding mechanism to assist in moving the heavy oil to