COGCC
Cleanup Concentrations
| Contaminant of Concern | Concentrations |
|---|---|
| Soil TPH (total volatile [C₆-C₁₀] and extractable [C₁₀-C₃₆] hydrocarbons) | 500mg/kg |
| Soils and Groundwater - liquid hydrocarbons including condensate and oil. | below visual detection limits |
| Soil Suitability for Reclamation | |
| Electrical conductivity (EC) (by saturated paste method)¹ ² | <mmhos/cm |
| Sodium absorption ratio (SAR) (by saturated paste method)¹ ² ³ | <6 |
| pH (by saturated paste method)¹ ² | 2mg/l |
| Organic Compounds in Groundwater ⁴ | |
| Benzne | 5μg/l |
| Toluene⁵ | 560 to 1,000μg/l |
| ethylbenzene | 700μg/l |
| xylenes (sum of o-, m-, and p- isomers = total xyelenes)⁵ | 1,400 to 10,000μg/l |
| naphthalene | 140μg/l |
| 1,2,4-trimethylbenzene | 67μg/l |
| 1,3,5-trimethylbenzene | 67μg/l |
| Groundwater Inorganic Parameters⁴ | |
| Total dissolved solids (TDS)¹ | <1.25 X local background |
| Chloride ion¹ | 250mg/l or <1.25 X local background |
| Sulfate ion¹ | 250mg/l or <1.25 X local background |