<_x0034_00986692>

400986692 19 2016-02-11T07:08:52.64-07:00 69175 PDC ENERGY INC

1775 SHERMAN STREET - STE 3000

DENVER CO 80203 Zack Liesenfeld 970 506-9273 970 373-6581 Zack Liesenfeld EHS Professional 2016-02-11T07:08:52.64-07:00 2016-02-11T07:08:52.627-07:00 444716 in process Cwasko 2016-02-10T10:22:19.313-07:00 Cwasko zack.liesenfeld@pdce.com 0.00000 zack.liesenfeld@pdce.com Zliesenfeld Zliesenfeld 2016-02-11T07:08:49.063-07:00 400986160 400986692 ALLISON, RICK 2016-02-07T00:00:00-07:00 WELL 05 123 25135 WELD NWSW 29 5N 63W 6 Y CROP LAND Sunny and Cool 0 0 On Sunday February 7th 2016 PDC Energy discovered water escaping from a failed valve on the Rothe 13-29U wellhead. The Rothe 13-29U well had been shut in for wellbore integrity. A casing valve on the wellhead experienced a failure, presumably due to a freeze. The release was controlled at the wellhead and fluids contained. More than 1 bbl but less than 5 bbls of water released outside secondary containment. Current remediation efforts and sampling are mitigating impacts. 400986160 true 2016-02-07T00:00:00-07:00 40.368560 -104.467240 FEE NA 0 0 0 true <_x0032_7_approved>false S false 0 0 0 0 0 false false true false false >=1 and <5 2016-02-09T13:49:11.563-07:00 Clean Water 400986692 400986692 FORM 19 SUBMITTED 400986692.pdf 400986692 400986706 TOPOGRAPHIC MAP Rothe 13-29U Wellhead - Figure 1.pdf 979328 400986692 400986707 SITE MAP Rothe 13-29U Wellhead Figure 2.pdf 232905 400986692 400986708 ANALYTICAL RESULTS Rothe 13-29U Wellhead Analytical Table and Laboratory Report.pdf 455781 400986692 1 2016-02-10T00:00:00-07:00 0 0 true false false false false false false On February 7, 2016, a water release occurred due to a failed casing valve at the Rothe 13-29U wellhead. The released volume was recovered using a vacuum truck. Approximately 10 cubic yards of soil were removed and transported to the Waste Management Facility in Ault, Colorado for disposal under PDC waste manifests. On February 8, 2016, five soil samples (SS01 – SS05) were collected from the excavation area at approximately 3 inches below ground surface (bgs). Soil samples were field screened for volatile organic compound concentrations (VOC) using a photoionization detector (PID). Samples were submitted to Summit Scientific Laboratories in Golden, Colorado for analysis of benzene, toluene, ethylbenzene, total xylenes (BTEX), naphthalene, total petroleum hydrocarbons (TPH) – gasoline range organics (GRO) by USEPA Method 8260, TPH – diesel range organics (DRO) by USEPA Method 8015, pH and electrical conductivity (EC). Analytical results indicated organic compound concentrations and physical parameters were in compliance with COGCC Table 910-1 standards in all five soil sample locations. The excavation extent and soil sample locations are illustrated on Figure 2. Soil analytical data is summarized in Table 1 and the laboratory report is included as Attachment A. Based on the soil analytical data described herein, hydrocarbon impacts in exceedance of regulatory standards were successfully removed from site. Consequently, PDC is requesting a No Further Action (NFA) determination for this release. Dacono clay loam, 0 to 1 percent slopes 80 13 42 660 1200 1580 0 0 0 0 0 0 0 0 0 0 false false 3 3 false false false false false false false false true false false true 65 80 Water 3 400986692 1 2016-02-10T00:00:00-07:00 false true false false A casing valve on the wellhead failed. Routine wellhead inspections will be completed. 10 true false false 0 0 Thread was being aborted.