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401056785 19 2016-06-03T11:07:10.687-06:00 47120 KERR MCGEE OIL & GAS ONSHORE LP

P O BOX 173779

DENVER CO 80217-3779 Erik Mickelson 720 929-4306 Erik Mickelson Senior HSE Representative 2016-06-03T11:07:10.687-06:00 2016-06-03T11:07:10.673-06:00 445876 in process bkieding 2016-06-01T14:10:52.423-06:00 bkieding erik.mickelson@anadarko.com 0.00000 erik.mickelson@anadarko.com bkieding bkieding 2016-06-03T11:07:08.953-06:00 401053751 401056785 GINTAUTAS, PETER 2016-05-25T00:00:00-06:00 TANK BATTERY WELD SESE 3 2N 65W 6 N CROP LAND Partly cloudy, 65 degrees F 0 0 During construction activities associated with a partially buried produced water sump which had been displaced by shallow groundwater, stained soils were encountered. When removed, the sump was intact and there were no signs of active leaking. During excavation activities to remove the stained soils, a hole was discovered in the buried liner. This made it possible for shallow groundwater to infiltrate fill material within the secondary containment. A groundwater sample was collected from the base of the excavation, and results from that sample received on May 25 indicated that impacts were present above the COGCC Table 910-1 allowable level for benzene. Remediation and assessment activities are ongoing and further information will be provided in a forthcoming Form 19 Supplemental report. A topographic facility location map is provided as Figure 1, and the laboratory report is attached. 401053751 false 2016-05-25T00:00:00-06:00 40.161837 -104.641005 FEE 1 0 0 false <_x0032_7_approved>false S false Unknown Unknown Unknown 0 0 false false false false true 0 2016-05-25T13:06:39.5-06:00 Oil, condensate, and produced water 401056785 401056785 FORM 19 SUBMITTED 401056785.pdf 401056785 401057999 TOPOGRAPHIC MAP Cannon_Land_62N65W_3SESE_Fig1_area_20160525.pdf 417167 401056785 401058008 SITE MAP Cannon_Land_62N65W_3SESE_Fig2_dig_20160601.pdf 331065 401056785 401058010 ANALYTICAL RESULTS SiteClearance_CannonLand62N65W3SESE_Soil_Table1.pdf 16206 401056785 401058011 ANALYTICAL RESULTS SiteClearance_CannonLand62N65W3SESE_GW_Table2.pdf 28632 401056785 401058014 ANALYTICAL RESULTS X605290 KMG-Cannonland 62N65W-3SESE.rpt.pdf 867193 401056785 1 SPILL 2016-05-25T00:00:00-06:00 Weld County Roy Rudisill

email 401056785 2 SPILL 2016-05-25T00:00:00-06:00 Weld County Troy Swain

email 401056785 3 SPILL 2016-05-25T00:00:00-06:00 Weld Country Tom Parko

email 401056785 4 SPILL 2016-05-25T00:00:00-06:00 landowner landowner

email 401056785 1 2016-06-02T00:00:00-06:00 0 0 false true false false false false 3 false Between May 19 and May 24, 2016, soil excavation and groundwater extraction activities were conducted following the discovery of stained soils beneath the produced water sump, at the Cannon Land 62N65W/3SESE facility (Location ID 332142). On May 24, four confirmation soil samples (West 1@3', South1@3', North1@3', and East 1@3') were collected at the sidewall extents of the excavation, at 3 feet below ground surface (bgs). Also on May 24, groundwater sample Groundwater 1@3' was collected from the excavation, at 3 feet bgs. All samples were submitted to Origins Laboratory in Denver, Colorado, for analysis. Groundwater samples were analyzed for benzene, toluene, ethylbenzene, and total xylenes (BTEX), by USEPA Method 8260. Soil samples were analyzed for BTEX and total petroleum hydrocarbons (TPH) - gasoline range organics (GRO) by USEPA 8260, TPH - diesel and residual range organics (DRO and RRO) by USEPA 8015, electrical conductivity (EC), and pH. For the soil samples, laboratory analytical results indicated that BTEX and TPH were below laboratory detection limits and EC and pH were within COGCC allowable levels. Analytical results of sample Groundwater 1@3' indicated that benzene exceeded the applicable COGCC Table 910-1 standard for groundwater, at 146 micrograms per liter (µg/L). The general facility layout, excavation location, and laboratory results are shown in Figure 2. Analytical results are summarized in Table 1 and Table 2, and the associated laboratory reports are provided. Road base. 3 10 730 700 2230 The final extent of the excavation spanned approximately 24 feet (west-east) by 27 feet (north-south). Approximately 20 cubic yards of impacted material was removed via hydro-vacuum, and transported to the Kerr-McGee Oil & Gas Onshore, LP's Aggregate Recycling Facility in Weld County, Colorado, for disposal. Approximately 160 barrels of groundwater were removed via vacuum truck, and transported to a licensed injection facility for disposal. A Form 27 Remediation Workplan will be prepared and submitted for the subject release. 0 0 0 0 false false 0 0 true true true false false false false false true true false true 27 24 Oil, condensate, and produced water 36 401056785 1 2016-06-02T00:00:00-06:00 false false true false Historical release, source unknown. Historical release, source unknown. A new liner will be installed within the secondary containment. 20 true false false 160 0 Thread was being aborted.