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UA - Onshore Gas Number: CO-HSE-032 <br /> HSE Procedure Custodian: Colorado Operations <br /> Spill Prevention, Control and Revision: 0 <br /> Countermeasure (SPCC) Plan Effective: January 2012 <br />12.0 FACILITY DRAINAGE <br />12.1 Diked Storage Area Drainage <br />Drainage of accumulated storm water, snow melt, or other liquids from the storage facilities into <br />the containment areas will typically be controlled as follows: <br />• The preferred method of removal of accumulated storm water or snow melt will be by <br />natural dissipation (evaporation and percolation) provided that the accumulation does not <br />damage the equipment/structures or inhibit operations conducted within the containment <br />area or reduce the secondary containment capacity to an unacceptable level. <br />Accumulated water will be visually inspected for oil, oil product and/or chemical <br />contamination and discharged only if no contamination is observed. Any such discharges <br />will be attended. <br />In the event that drainage of contaminated liquids (also including non-contaminated <br />water from areas which are not equipped with drain valves) from a containment area is <br />required, the use of a vacuum truck, pump or other means will be evaluated for the <br />removal. Any contaminated liquids will be disposed properly at an appropriate facility. <br />12.2 Storm Water Drainage Procedures <br />Containment area drainage procedures consist of: <br />• Primary: Natural dissipation of storm water and snow melt. The accumulation of storm <br />water and snow melt (including snow and ice) will not be allowed to significantly impact <br />containment capacity or the operations of facilities within the containment area. <br />• Secondary: Storm water and snow melt will flow down gradient via ditches to an incised <br />retention pond on the East RDD site. <br />Emergency Conditions Only: Drainage of contaminated liquids will be handled with <br />vacuum trucks, pumps or other means. Contaminated liquids will not be drained to the <br />ground. <br />Other than the procedures identified in this section, storm water is not treated at the Facility. <br />Printed: April 7, 2011 Section 12 Page 39 of 71 <br />The controlled version of this "controlling document" resides online in Livelink®. Printed copies are UNCONTROLLED.