| While rebuilding the WCR Properties 41-5/Spaur 1-5 tank battery, soil and groundwater with historical petroleum hydrocarbon impacts were discovered. The volume of the release is unknown. Groundwater was encountered at approximately 12 feet below ground surface. On August 6, 2018, a groundwater sample was collected from the excavation and submitted to Origins Laboratory for analysis of benzene, toluene, ethylbenzene, and total xylenes (BTEX) by USEPA Method 8260C. Laboratory analytical results received August 7, 2018 indicated that the benzene concentration in groundwater sample GW01 exceeded the COGCC Table 910-1 allowable level for benzene at a concentration of 2,010 ug/L. Soil excavation activities are ongoing and will be summarized in a supplemental report. The topographic site location map showing the geographic location of the release is provided as Figure 1. |