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UST Monitoring Plan • • Stockton Service Center • Remove all sources of ignition in the area of the tank. Take the pumps out of service and place barricades and/or traffic cones around the tank to restrict access. Post"Out-of- If precision tests indicate that the piping and not the tank body is leaking, arrange for a tanker truck to lower the liquid level in the tank. If the tank body is leaking, make arrangements for the removal of the tank's contents as soon as possible. To avoid contaminating the product with sludge or water, do not pump off the bottom of the tank. Leave a 4 to 6 inch layer of product in bottom of the tank to assure a rich non- explosive vapor mixture,. Notify your local permitting agency immediately by telephone and inform them of the situation and actions taken. Follow up with a letter within 5 days. Coordinate with the Division Environmental Specialist to schedule preliminary subsurface investigation to determine the extent of the damage and what remedial action will be taken, i.e., repair or closure. Arrange for an alternate fuel source to meet operational needs, e.g., obtain fuel from another company facility, an off-site commercial service station, install and above ground portable storage tank, store fuel on site in a tanker truck, etc. Coordinate arrangements with the Division Environmental Specialist to insure compliance with jurisdictional regulatory agencies. B. HYDRAULIC OIL OR WASTE MOTOR OIL (Universal Sensors Model LA-04 Leak Alertl. • 1. When the system is operating normally, 2. A leak will be suspected when a BUZZER ALARM sounds and one of the four(4) RED liquid detection sensor ALARM lights is lit on the tank-monitoring panel. Any of the four(4) red lights in the second (middle) row indicate that a liquid sensor has either detected a liquid or has failed. The third (bottom) row of red lights is for vapor-sensing probes, which have not been installed in this system. These lights should be ignored. The identification of the activated sensor or probe will be indicated on the location map posted on the wall adjacent to the monitor. 3. Investigate the alarm by inspecting the appropriate sensor to determine if a leak has occurred or if storm water runoff has entered the containment. 4. If the sensor one of the tanks' annular spaces has triggered the alarm, and liquid is present in the annular space of the subject tank, obtain a sample, if possible, to determine whether the liquid is petroleum product or water. If product is found, a state-certified tank tester must be contacted to perform a precision leak test. Acceptable test methods include Horner Easy Check, Petrotight, and U.S. Test. 5. Remove the tank from service, and contact your Monitoring System Service Representative (Sacramento Equipment Maintenance Company). Provide as much information as possible, i.e., Unit Serial Number, nature of problem, special circumstances, etc. Contacts: Jim Bickford Dave Germann Division Fleet Services Supervisor Division Environmental Specialist 4040 West Lane, Stockton OR 4040 West Lane, Stockton Company Ext. 8-842-1525 Company Ext. 8-842-1566 PTT: (209) 942-1525 PTT: (209) 942-1566 Pager: (209) 520-5919 Pager: (209)520-1566 Page 4 of 6 UST Monitoring PlanLdoe