<_x0034_01001536>

401001536 19 2016-03-09T07:16:24.437-07:00 69175 PDC ENERGY INC

1775 SHERMAN STREET - STE 3000

DENVER CO 80203 Zack Liesenfeld 970 506-9273 970 373-6581 Zack Liesenfeld EHS Professional 2016-03-09T07:16:24.437-07:00 2016-03-09T07:16:24.423-07:00 444996 in process Cwasko 2016-03-08T09:37:17.47-07:00 Cwasko zack.liesenfeld@pdce.com 0.00000 zack.liesenfeld@pdce.com Zliesenfeld Zliesenfeld 2016-03-09T07:16:22.11-07:00 400996359 401001536 ALLISON, RICK 2016-02-25T00:00:00-07:00 TANK BATTERY WELD SENW 14 6N 66W 6 Y CROP LAND Sunny and cool 0 0 A historic release was discovered on the Charles 1 location while abandoning the production facility. Current remediation efforts are mitigating impacts at this location. 319596 400996359 false 2016-02-25T00:00:00-07:00 40.488560 -104.748360 FEE NA 0 0 0 true <_x0032_7_approved>false S false 0 0 Unknown 0 0 true false false true false 0 2016-02-26T07:36:31-07:00 401001536 401001536 FORM 19 SUBMITTED 401001536.pdf 401001536 401001557 OTHER Charles 1 Produced Water Vessel Closure Report.pdf 1634891 401001536 401001563 ANALYTICAL RESULTS Charles 1 Analytical Tables and Laboratory Reports.pdf 517102 401001536 401001566 TOPOGRAPHIC MAP Charles #1 - Figure 1.pdf 1022389 401001536 401001570 SITE MAP Charles 1 - Figure 2.pdf 272492 401001536 1 2016-03-08T00:00:00-07:00 0 0 true false false false false false 13 false On February 25, 2016, a historic release was discovered during facility decommissioning activities at the Charles #1 location. Approximately 340 cubic yards of impacted material were removed and transported to the Waste Management Facility in Ault, Colorado for disposal under PDC waste manifests. Four (4) soil samples (SS01 – SS04) were collected from the sidewalls of the final excavation extent at approximately 11 feet below ground surface (bgs). Soil samples were field screened for volatile organic compound (VOC) concentrations 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, and total petroleum hydrocarbons (TPH) - gasoline range organics (GRO) by Environmental Protection Agency (EPA) Method 8260B, TPH - diesel range organics (DRO) by EPA Method 8015, pH, and electrical conductivity (EC). Analytical results indicated organic compound concentrations were below COGCC Table 910-1 standards in all four (4) soil sample locations. EC concentrations were in exceedance of regulatory standards in two (2) soil sample locations (SS01 and SS02). However, additional soil removal was not completed as samples were collected below the designed root zone. Groundwater was encountered in the excavation area at approximately 13 feet bgs. A groundwater sample (GW01) was collected and submitted for laboratory analysis of BTEX. Analytical results indicated BTEX concentrations were below COGCC Table 910-1 groundwater standards. The excavation extent and soil and groundwater sample locations are illustrated on Figure 2. Soil analytical results are summarized in Table 1 and groundwater analytical results are summarized in Table 2. The laboratory reports are included as Attachment A. Based on analytical data described herein, PDC is requesting a No Further Action (NFA) determination for this release. Kim loam, 1 to 3 percent slopes 13 0 3150 1250 2450 1380 Partially buried produced water vessel removed. Refer to attached Closure Report and Blanket Remediation # 9440. 0 0 0 0 0 0 0 0 false false 0 0 false false true false false false false false true false false true 25 25 Thread was being aborted.