| A historical release was discovered during the replacement of a produced water sump at the HSR-Columbine 1-5A production facility. Excavation of impacted material commenced on July 18, 2014, and approximately 280 cubic yards of impacted material was removed and transported to the Front Range Regional Landfill in Erie, Colorado for disposal. Groundwater was encountered in the excavation area at approximately 12 feet below ground surface (bgs). A groundwater sample (GW01) was collected and submitted to eAnalytics Laboratory in Loveland, Colorado for analysis of benzene, toluene, ethylbenzene, and total xylenes (BTEX). Analytical results received on July 20, 2014 indicate BTEX concentrations are in exceedance of the applicable COGCC Table 910-1 standards, causing this historic release to be reportable. |