SITE INFORMATION AND CORRESPONDENCE

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0 • 5. SK completed its cleaning of all three basins. SK, however, left clean absorbents at the bottom of all three basins due to the apparent initial desorption of oily liquid from the bottom of the basins up onto the surface of the basin. 6. TRE reviewed the manifest and the material profile. The manifest lists two (2) 55- gallon drums of CA 223, Texas waste code OUTS 6091, which was transported by Safety Kleen to Safety Kleen's facility located in Denton, Texas (see copy of the manifest enclosed in attachment B). 7. Mr. Calcaterra signed the manifest and the material profile prior to the off-site transportation of the two drums. Copies of the manifests, material profile and SK's indemnification certification were presented to Mr. Calcaterra and per Mr. Calcaterra's request, these documents were later on the same day given to Chris Nielsen of Mayall Hurley Law Firm in Stockton, CA. 8. As was required by our scope of work, TRE conducted inspection all three basins (N 37 57 416, W 121 17 743) in order to conduct a preliminary visual assessment of the condition of the concrete liner. The flow of the material in these basins appear to be from the right to left as the depth of the basins are: 31.2" (first basin), 21" (second basin), and 20" (third basin), hence suggesting a pressure gradient induced fluid flow from right (East) to left (West). 9. TRE observed that the first two basins appeared to have some pitting and damage at their bottom layers. The third basin was observed to have significant pitting and damage on its bottom layer. TRE observed chunks of broken up and damaged concrete that were removed with the oily sludge during SK's cleaning of the third basin. Exposed soil or soft sediments (which appeared to have been impacted by the oily liquid) beneath the third concrete basin was observed when checked with hand by TRE. 10. TRE also observed an outflow pipe in the third basin, which appeared to be situated at a low point in the third basin, suggesting that the concrete basin was designed as a simple gravity induced concrete chamber oil/water clarifier. 11. At the request of Mr. Calcaterra, TRE returned back to the site the next day (11/24/04) and visually observed the basin for any evidence of desorbed oil. TRE did not observe significant amount of oily liquid that were absorbed by the absorbent pads. The absorbent pads were left in the cleaned and pumped out basins. In view of the above, in order to ensure that our client is complying with the California Health and Safety Code (CAHSC) Section 25507 and other applicable section of the CAHSC, the foregoing notification is hereby made to your attention. We are also copying the State OES, San Joaquin County Environmental Health Department, California Department of Toxic Substances Control (DTSC) and the Central Valley Regional Water Quality Control Board (CVRWQCB). 2