<_x0034_00873203>

400873203 19 2015-07-24T10:08:21.5-06:00 47121 KERR MCGEE GATHERING LLC

PO BOX 173779

DENVER CO 80202-1918 Charles Chase 970 336-3500 970 515-1176 Charles Chase Senior HSE Representative 2015-07-24T10:08:21.5-06:00 2015-07-24T10:08:21.47-06:00 442569 in process Cwasko 2015-07-23T13:19:25.563-06:00 Cwasko charles.chase@anadarko.com 0.00000 charles.chase@anadarko.com Cwasko Cwasko 2015-07-24T10:08:19.89-06:00 400870745 400873203 CHESSON, BOB 2015-07-16T00:00:00-06:00 PIPELINE ARAPAHOE NWNW 31 5S 64W 6 Y NON-CROP LAND Overcast, 80s 0 0 During routine operations, a line failure was discovered on the 16-0000-6069-6" Pipeline. An unknown volume of oil was released into the subsurface from a corrosion hole in the pipeline. The line was isolated and blown down, and impacted soil was excavated from the area surrounding the release point. Excavation activities are ongoing; additional information will be provided in a supplemental Form 19. A topographic Site Location Map showing the location of the release is attached as Figure 1. 400870745 true 2015-07-16T00:00:00-06:00 39.579620 -104.603214 STATE 0 0 0 false <_x0032_7_approved>false S false Unknown 0 0 0 0 false false false false true 0 2015-07-18T10:17:21.843-06:00 400873203 400873203 FORM 19 SUBMITTED 400873203.pdf 400873203 400873458 ANALYTICAL RESULTS Pipeline 16-0000-6069-6 Analytical Tables and Laboratory Reports.pdf 2362959 400873203 400873483 TOPOGRAPHIC MAP Pipeline16-0000-6069-6 - Figure 1.pdf 96295 400873203 400873485 SITE MAP Pipeline 16-0000-6069-6 Figure 2.pdf 221330 400873203 1 SPILL 2015-07-16T00:00:00-06:00 County Diane Kocis

email 400873203 1 2015-07-24T00:00:00-06:00 0 0 true true false false false false 13 false On July 16, 2015, a line failure on the 16-0000-6069-6" Pipeline was reported to the COGCC as a reportable release. An unknown volume of oil was released. Approximately 960 cubic yards of impacted material were removed and transported to the Tower Landfill in Commerce City, Colorado for disposal. Excavation activities were guided in the field using a photoionization detector (PID) to screen soils for volatile organic compound (VOC) concentrations. Seventeen soil samples were collected from the sidewalls and base of the excavation area at approximately 12 feet and 13 feet below ground surface (bgs), respectively. Soil samples were submitted to Origins Laboratory in Denver, Colorado for analysis of benzene, toluene, ethylbenzene, total xylenes (BTEX) and total petroleum hydrocarbons (TPH) – gasoline range organics (GRO) by USEPA Method 8260, and TPH – diesel range organics and oil range organics (DRO and ORO) by USEPA Method 8015. Analytical results indicated constituent concentrations were below applicable COGCC Table 910-1 soil standards in the soil samples collected from the final excavation extent. Groundwater was encountered in the northwest area of the excavation at approximately 13.5 feet bgs. Two groundwater samples (GW01 and GW02) were collected from the excavation area on July 20 and July 22, 2015, respectively, and submitted for laboratory analysis of BTEX. Analytical results indicated benzene concentrations were in exceedance of applicable COGCC Table 910-1 groundwater standards in both groundwater sample locations. Approximately 1 barrel of impacted groundwater was removed with impacted soil using a hydroexcavator and taken to Tower Landfill in Commerce City, CO for disposal. The excavation extent and soil and groundwater sample locations are illustrated on Figure 2. Soil analytical data is provided in Table 1 and groundwater analytical data is provided in Table 2. Sandy clay 14 7 1255 3095 0 0 0 0 0 0 0 0 false false 0 0 true false false false false false false false true true true true 115 25 6 400873203 1 2015-07-24T00:00:00-06:00 false true false false The failure in the line was caused by corrosion. The pipeline will be repaired and sacrificial anodes will be installed to prevent corrosion. 960 true false false 1 0 Thread was being aborted.