Based on possible field indicators operator submitted excavation soil samples to the laboratory for same-day turnaround. Partial laboratory analytical data indicated a historical release occurred at the Dillard AB10-02 decommissioned wellhead. One sidewall sample and one flowline riser sample from the same wellhead excavation exceeded ECMC standards. WH01-W, and FLR01 exceeded ECMC standards for benzene at 0.0114 mg/kg, 1,2,4-trimethylbenzene at 0.0258 mg/kg, and 0.0704 mg/kg, 1,3,5-trimethylbenzene at 0.0443 mg/kg, and 0.0954 mg/kg, naphthalene at 0.124 mg/kg, and 0.468 mg/kg, TPH at 1,315 mg/kg, and 2,703 mg/kg, 1-methylnaphthalene at 0.239 mg/kg, and 0.835 mg/kg, 2-methylnaphthalene at 0.527 mg/kg, and 1.60 mg/kg. This location lies within the Pronghorn Winter Concentration high priority habitat. The supplemental Form 27 will be submitted once all lab data is received for remediation number 35736 detailing the remedial site plan, document number 403899492. |