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, r Once tank 609 fills to the elevation of the point of discharge into the separator, the volume of tank 609 will remain constant. Water will flow from the bottom of tank 609 into the separator and product will remain at the top of tank 609. The system is, in effect, a two-stage oil/water separator. The attached drawing (number 2476) illustrates the system as described. Controls have been built into the system that will cause pumping to cease under two conditions. To prevent free product from being discharged to the sewer, the oil/water separator has a hydrocarbon sensor placed approximately one foot below the water level . When a foot of product accumulates in the separator, power to the air compressor operating the pumps is cut off and an alarm light comes on in the office. The product must be drained off into the adjacent waste oil tank before pumping can resume. At the present time, the valve between tank 609 and the separator is closed. To prevent tank 609 from overflowing, a high level alarm has been installed that causes a solenoid valve to shut off the air supply to the pumps. This condition is also signaled by an alarm light in the office. We are still attempting to identify the source of the gasoline "spill " (for want of a better word) and are experimenting with ways to improve the rate of product recovery from our wells. It is not possible to predict how our recovery system might change in the future, since our investigation has not been concluded. You may rest assured that Time Oil remains as committed as ever to resolving this problem. Should you or your staff have any questions about the configuration or operation of this system, please do not hesitate to call . To avoid any future delay in our response to you, kindly address correspondence to me at our Seattle office. Sincerely, / Fred Proby Environmental Specialist cc: Bob Niblack, Central Valley RWQCB Ronald Valinoti , San Joaquin Local Health District Attachment a/s