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Profleet Truck Lube AST Release - 3 - 3 December 2018 Actions: After observing the release of unused motor oil on 13 June 2018, Profleet notified the local fire department, the California Office of Emergency Services, and the San Joaquin County Environmental Health Department on the same day. Profleet engaged Fremouw Environmental Services (FES) to remove oil within the secondary containment. Approximately 4,000 gallons of oil was removed, and the secondary containment area was pressure washed with soapy water. The motor oil was transported as "used oil' and the wash water was transported as "oily water" under two separate manifests to off-site disposal facilities. An inspection of the secondary containment wall found that oil had seeped through cracks at the base of the wall. Profleet engaged FES to excavate and properly dispose of the impacted soil. On 25 June 2018, the top six inches of soil was excavated from the outside of the base of the containment wall. Soil samples were collected and submitted for laboratory analysis that found total petroleum hydrocarbons (TPH) as diesel from 7.2 to 960 milligrams per kilogram (mg/kg) and TPH as motor oil from 90 to 15,000 mg/kg. On 3 August 2018, an additional 12 to 18 inches of soil was excavated from the perimeter of the containment wall and confirmation samples were collected for laboratory analysis. TPH as diesel was detected at 2.5 to 15 mg/kg, and TPH as motor oil was detected at 45 to 275 mg/kg. Final Report and Recommendations: A 15 August 2018 Above Ground Tank Re/ease report was prepared by Cook Environmental Service, Inc. documenting the cleanup and requesting No Further Action. The report concludes that the residual concentrations detected in the confirmation soil samples indicate there is no significant risk to human health or the environment, and requests case closure. Central Valley Water Board staff has discussed the remedial activities and the report with San Joaquin County which indicated they are satisfied with the cleanup activities. Based on the relatively low levels of motor oil constituents in the confirmation samples, the low mobility of the oil in the subsurface, the distance from the residual TPH in the soil to groundwater, and discussions with San Joaquin County, Central Valley Water Board staff finds that the motor oil -contaminated soil has been remediated to the extent practicable and recommends No Further Action for the motor oil release cleanup. o 4 2019 EMIRONMEN M �''