| While cutting and capping a line near the separator at the Binder 9, 10, 15, 16, 20-28 tank battery facility, soil with historical petroleum hydrocarbon impacts was encountered. The volume of the release is unknown. Groundwater was encountered in the excavation at approximately 4 feet below ground surface. A groundwater sample (GW01) was collected and submitted for laboratory analysis of BTEX. Laboratory analytical results received on July 17, 2017, indicated sample GW01 exceeded the COGCC Table 910-1 allowable level for benzene at a concentration of 2,040 µg/L. The excavation details and analytical results will be summarized in a supplemental report. A topographic Site Location Map showing the geographic setting of the release is provided as Figure 1. The excavation groundwater sample analytical results are summarized in Table 1, and the laboratory analytical report is attached. |