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401207431 19 2017-02-10T10:31:20.223-07:00 10084 PIONEER NATURAL RESOURCES USA INC

5205 N O'CONNOR BLVD STE 200

IRVING TX 75039 Cherylyn Morgan 719 846-7898 Cherylyn Morgan Environmental Technician 2017-02-10T10:31:20.223-07:00 2017-02-10T10:31:20.207-07:00 449145 in process cherylynmorgan 2017-02-10T10:15:30.24-07:00 cherylynmorgan cherylyn.morgan@pxd.com 0.00000 cherylyn.morgan@pxd.com cherylynmorgan cherylynmorgan 2017-02-10T10:31:17.147-07:00 401202441 401207431 Kosola, Jason 2017-02-03T00:00:00-07:00 WATER GATHERING SYSTEM/LINE LAS ANIMAS SWNW 25 33s 67W 6 Y NON-CROP LAND Sunny-Warm Thawing Coditions 0 0 A spill that was found on the Rusted Root 12-25 well site (API# 05-071-09175) 2/3/17 between3:00 - 4:00PM. Ryan Costa with the Sate of Colorado contacted Pioneer to notify us of the water leak. Lease Operator went to location and found the pin plate spring came out of pin plate on PC stuffing box. The path of the leak went across location and flowed to the south-west corner leaving the location. It is estimated that 4 bbls of produced water was spilled. No state waters were involved. The leak was isolated immediately. Rusted Root 12-25 427440 401202441 true 2017-02-03T00:00:00-07:00 37.143240 -104.845790 FEE 0 0 0 true <_x0032_7_approved>false S false 0 0 >=1 and <5 0 0 false false false true false 0 2017-02-05T14:48:51.18-07:00 401207431 Produced water quality data from the well associated with or representative of the spill is attached. Pioneer and its consulting geochemical specialists have found, after 20 years operating in the Raton Basin CBM field, that soil sampling no longer adds useful data on smaller, short-term spills as land uses and the environment are not sensitive to short-term exposure to CBM produced water. Effects to soil chemistry from short-term CBM produced water spills are temporary and shallow for several reasons: the water does not contain crude oil or liquid hydrocarbons; the TDS is significantly less than 10,000 mg/L; it is suitable for livestock watering, wildlife and in many cases surface discharge. Mixed with other water it is suitable for irrigation without impact. 401207431 401207431 FORM 19 SUBMITTED 401207431.pdf 401207431 401207452 ANALYTICAL RESULTS Water Quality Rusted Root_12-25.pdf 116647 401207431 1 SPILL 2017-02-04T00:00:00-07:00 COGCC Jason Kosola

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401207431 2 SPILL 2017-02-04T00:00:00-07:00 LACOG Bob Lucero

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401207431 1 2017-02-10T00:00:00-07:00 0 0 true false false false false false false Visual Inspection From the NRCS soil survey map: Lorencito -Sarcillo-Trujillo Complex 150 0 909 Well was shut down until repairs to the well/pin plate could be completed. 0 0 0 0 0 4 0 0 0 0 585 false false 0 0 false false false false false false true false true true true false 266 4 401207431 1 2017-02-09T00:00:00-07:00 false true false false Root cause was determined as Mechanical Failure due to normal wear & tear/inadequate mantenance. Well was in normal operations, gathering line pressure caused worn pin to slide out due to excessive wear. Install oil bath style pin plate (Oryx Style) 0 false false false 0 0 Thread was being aborted.