<_x0034_00796717>

400796717 19 2015-02-23T09:51:45.047-07:00 96155 WHITING OIL & GAS CORPORATION

1700 BROADWAY STE 2300

DENVER CO 80290 Mark Keyes 970 407-3007 989 390-4189 Mark Keyes Env Coord Supervisor 2015-02-23T09:51:45.047-07:00 2015-02-23T09:51:45.03-07:00 440875 in process markkeyes 2015-02-20T12:45:21.577-07:00 markkeyes mark.keyes@whiting.com 0.00000 mark.keyes@whiting.com markkeyes markkeyes 2015-02-23T09:51:43.017-07:00 400792643 400796717 ALLISON, RICK 2015-02-13T00:00:00-07:00 WELL PAD WELD NWSE 27 10N 58W 6 Y NON-CROP LAND partly cloudy 0 0 A release occured at the Razor 27J pad due to a partially opened valve on the side of a frac tank during flowback. The valve was closed, free liquid was recovered, and the impacted soil has been removed and stockpiled onsite. All soils impacted >Table 910-1 will be removed. 434267 400792643 true 2015-02-13T00:00:00-07:00 40.808650 -103.848944 FEE Betty Castor 0 0 0 false <_x0032_7_approved>false S false Rangeland >0 and <1 0 0 0 >=5 and <100 true false false true false 0 2015-02-14T10:04:08.233-07:00 15 bbls of fluid was released 99% flowback water and 1% crude oil 400796717 400796717 FORM 19 SUBMITTED 400796717.pdf 400796717 400797256 TOPOGRAPHIC MAP CO Spill Topo_RAZOR 27J Pad.pdf 1614201 400796717 1 SPILL 2015-02-14T00:00:00-07:00 Landowner Betty Castor

notification

303 8635178 400796717 1 2015-02-20T00:00:00-07:00 0 0 true false false false false false 0 false The impacted soil was scrapped from the surface and visual evidence was used to confirm removal. The soil in the area of the release consists of the Epping Silt Loam 0-9 percent slopes and the Kim Mitchell 0-6 percent slopes. The Epping formation has depths ranging from 10 to 20 inches before encountering paralithic bedrock. The Kim Mitchell is a loam-clayey loam to depths upto 60". Both soil types are well drained. The Ksat values for the Epping Silt limiting layer range from moderately low to moderatley high and the valuse for the Kim Mitchell are moderately high. 37 1 2251 1300 4650 The impacted soil was scrapped from the surface where the release occurred and placed on a liner that was set on an earthen berm constructed at the site to hold the impacted soil. A shredder will be brought on-site to treat the soil and the soil will be sampled and returned to the location. 0 0 0 0 0 0 0 15 0 false false 0 0 false false false false false false false false true true false true 50 20 2 400796717 1 2015-02-20T00:00:00-07:00 true false false false The release occurred as a result of a partially opened valve on the side of frac tank during flowback and the root cause was lack of a procedure to confirm the status of all connections on the frac tank prior to putting the tank into use. Going forward the flowback team will implement training of employees to confirm all connections are in the required position needed for use before allowing liquids to enter the tank. 6 false true false 0 0 Thread was being aborted.