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October 11, 2011 Page 18 <br />4.3.4 Gas Pipeline Ancillary Structure Damage Mitigation Plan <br />A damage mitigation plan identical to the gas pipeline plan is recommended. <br />4.4 Water Pipeline <br />4.4.1 Water Pipeline Subsidence Control Plan <br />Water pipelines typically run parallel and adjacent to gas pipelines, carrying produced <br />water from the wellhead to water disposal pits. The buffer zones established for gas pipelines <br />should protect water pipelines as well. Since the damage criterion for water pipelines is <br />5 millistrain as compared to 2 millistrain for gas pipelines, the monitoring done for gas pipelines <br />should apply to water pipelines as well. Therefore, a separate water pipeline monitoring plan is <br />not required. <br />4.4.2 Water Pipeline Monitoring Plan <br />The monitoring plan for gas pipelines described in Section 4.2.2 applies to water <br />pipelines. <br />4.4.3 Worst Possible Consequences of Damage to Water Pipelines <br />Damage to a water pipeline could affect the water flow away from the production site. <br />At worst, a broken pipeline could leak produced water to the ground releasing contaminants (if <br />present) in the process. <br />4.4.4 Water Pipeline Damage Mitigation Plan <br />A damage mitigation plan identical to the gas pipeline plan is recommended. <br />4.5 Water Pipeline Ancillary Structures <br />4.5.1 Water Pipeline Ancillary Structure Subsidence Control Plan <br />. Water discharge points and water valves have been classified as ancillary structures to <br />water pipelines. Since damage to these structures will affect the functioning of the water <br />pipelines they are associated with, the subsidence control plan for such structures should be <br />identical to that for water pipelines. <br />4.5.2 Water Pipeline Ancillary Structure Monitoring Plan <br />A monitoring plan identical to the water pipeline monitoring plan is recommended. <br />4.5.3 Worst Possible Consequences of Damage to Water Pipeline Ancillary Structures <br />Damage to a water valve could affect the water flow away from the production site and <br />disrupt other associated operations. At worst, a broken valve could leak produced water to <br />ground, releasing contaminants in the process. More than the allowable horizontal displacement <br />Agapito Associates, Inc. <br />