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i ES-2 � � h of confirmation sampling indicated that this process was not successful for the hydrocarbon compounds present at this Site. After treatment, hydrocarbon concentrations in the soil were not below criteria agreed to by the County. A Additional analyses were conducted to determine if the affected soil exhibited the characteristics of a hazardous waste, as defined in the California Code of Regulations, Title 22, Article 3, Chapter 11. These analyses showed the, soil. to.be,.non-toxic, non-reactive, non- corrosive, and non-ignitable' Additionally, the hydrocarbons were shown to be non-leachable, based on Toxicity Characteristic Leaching Procedure (TCLP) analyses of the soil. Based on the non-leachable-and non-hazardous characteristics of the soil, Sheldon and the County agreed to k place a sheet plastic liner in the excavation and backfill it with the soil that had been excavated and stockpiled material. Additional soil samples were collected and analyzed to document the concentrations of total petroleum hydrocarbons (TPH) in the soil at the limits of the excavation. The excavation was lined with three layers of 10 millimeter visqueen with proper t I overlapping and caulked seams. 2,077 tons of pea gravel were imported and placed by Kause Construction in the excavation. This brought the level of the pea gravel to 25 feet bgs. The pea gravel was the compacted to approximately 95-percent compaction using a vibratory compactor. The stockpiled soil was placed by Kause Construction on top of the pea gravel in 2-foot lifts and A compacted to approximately 95-percent compaction using a vibratory compactor. All of the soil } originally excavated from the area was used as fill material. The Site will be returned to its } ` original condition by paving as soon as weather permits. ' As required b the County,q y apost-closure groundwater monitoring program will be implemented at the closed UST facility. A work plan for the installation and sampling of the groundwater monitoring wells will betY re ared and submitted to the County forapproval. P P PP ` Use or disclosure of.data contained on this sheet is subject to the restriction specified at the beginning of this document. i 1 Zr'?ry3�.--V603\RMFORTS\K£Nf 011-CMO QM&PS-21200 }