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• Geological TeCIMics Inc. Page 3 Del Valle(Hwy 99) Project No.: 1117.2 January 20,2004 A Chain of Custody was completed for all samples collected and tracked to ensure sample integrity. The detection limits for these compounds are listed below. DetectionLimits: I Oxygenates Soil (pg/Kg) 3.0 DISCUSSION, CONCLUSIONS& RECOMMENDATIONS 3.1 Discussion The shallow subsurface soils at this site are dominated by clayey soil. As the log shows, the soils are described as follows: ❑ The upper 7 feet consisted of fill material, and consisted of silt and clay soils, with varying amount of sand ❑ From 7 to 13 feet bgs- the soil consisted of silty clayey sand ❑ From 13 to 23 feet bgs- consisted of plastic clay soils Field observations indicated that no petroleum hydrocarbons or fuel additives were present in the soil cores collected from the borehole. Four soil samples were tested for MTBE and the other main oxygenated fuel compounds by EPA method 8260B. The test results corroborate with field observations and no oxygenated compounds were found. 3.2 Conclusions Given the data obtained during the tank closure sampling work and during this phase of investigation, we conclude that petroleum hydrocarbons were not released from the former UST operation at this property. 3.3 Recommendations We recommend that not further investigation be performed and that the site be closed by San Joaquin County EHD. 4.0 LIMITATIONS This report was prepared in accordance with the generally accepted standard of care and practice in effect at the time Services were rendered. It should be recognized that definition and evaluation of environmental conditions is an inexact science and that the state or practice of environmental geology/hydrology is changing and evolving and that standards existing at the present time may change as knowledge increases and the state of the practice continues to improve. Further, that differing subsurface soil characteristics can be experienced within a small distance and therefore cannot be known in an absolute sense. All conclusions and recommendations are based on the available data and information. The tasks proposed and completed during this project were reviewed and approved by the local regulatory agency for compliance with the law. No warranty, expressed or implied, is made.