Navy Risk Assessment of Former NAS Xxxxxxx Field Petroleum Site Sample Clauses

Navy Risk Assessment of Former NAS Xxxxxxx Field Petroleum Site. 9 As discussed in Section 2.4.5.2, soil and groundwater in the vicinity of the old fuel farm (Building 29) and the old Naval Exchange gasoline station (Building 31) have been impacted by TPH and BTEX compounds. The Navy has conducted Tier 1 and Tier 2 RBCA screening evaluations for the Building 29 and 31 areas. In the Tier 1 screening evaluation, risk-based screening levels (“RBSLs”) were calculated using standard U.S. EPA default exposure parameters for an occupational and construction worker soil exposure scenario and standard default assumptions in the DTSC version of the Xxxxxxx and Xxxxxxxx vapor intrusion model for an indoor air vapor intrusion exposure scenario for indoor workers. A comparison was made between maximum concentrations of COPCs in soil and groundwater found within Site 9 and the Tier 1 RBSLs; the maximum concentrations in soil and groundwater exceeded the Tier 1 RBSLs for the indoor worker vapor intrusion exposure scenario (Tetra Tech, 2003b). Tier 2 RBSLs were subsequently developed for this scenario using assumptions based on site-specific data and compared to maximum soil and groundwater concentrations. The maximum soil concentration for benzene was found to exceed the Tier 2 RBSL, so further evaluation was conducted. Exposure point concentrations were developed separately for the Building 29 and Building 31 areas based on the calculated 95 percent upper confidence limit of the arithmetic mean concentration for each chemical within the area in question. The Tier 2 RBSLs were compared to the calculated exposure point concentrations. The additional evaluation resulted in a calculated excess cancer risk for indoor workers from volatilization of benzene from subsurface soil of 2 x 10’7 for the Building 29 area; for the Building 31 area, the excess cancer risk was calculated to be 8x10-6. While the calculated risk level for the Building 31 area is above the 1x10-6 target risk level for which the RBSLs were calculated, it is within the IO-4 to 10’6 target range for acceptable risks used by U.S. EPA at Superfund sites. Although NASA has established 10’6 as the acceptable risk level, the Navy has recommended no further action be taken for the Site 9 petroleum site. A draft report summarizing the risk assessment has been submitted to the RWQCB for review (Tetra Tech, 2003b). The RBSLs calculated for Petroleum Site 9 for the vapor intrusion indoor exposure scenario using the Xxxxxxx and Xxxxxxxx model are lower than the U.S. EPA Region IX PRG...
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