A Supplemental Report Regarding the Environmental Contamination From TexPet’s E&P Activities
November 7, 2014
Figure 3.3-5 Hypothetical Vertical Composite Samples Outside Pit94
However, Chevron’s own data from subsurface samples collected outside of pits (samples that were not composited and came from the subsurface)95 show that petroleum hydrocarbons are able to escape the pits and contaminate the surrounding soil at depth. Figure 3.3‐6 shows that for these samples, 43 percent exceed the RAOHE standard for agricultural soil and TULSMA standard for residential soil (2,500 mg/kg), 60 percent exceed the RAOHE standard for sensitive ecosystems (1,000 mg/kg), and 82 percent are greater than the Lago Agrio Judgement criterion of 100 mg/kg.
This schematic shows a composite of features from a variety of E&P sites for illustration purposes.
From Chevron’s August 2013 Access Database, a total of 141 samples were classified as “JI,” “PI,” or “Rebuttal,” “Outside,” “subsurface,” “Non‐RAP soil,” but, not classified as “composite”, “single boring composite,” or “perimeter”.