SITE INFORMATION AND CORRESPONDENCE

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VUJ/1-K LUI-b 1 W dward-Clyde Consultants in a loss of product during the first test and a gain of product during the second. The contractor performing the test felt that the tank was sound and that air bubbles were causing the discrepancies. He also recommended that the inventory reconciliation system be installed prior to testing the tank again. Once this investigation and remediation is complete, LOF will fill in the excavation, complete the installation of the tank monitoring system, test the tank and -relocate the pump, and pour a concrete slab over the existing tank and excavation. RECOMMENDATIONS Based on the above conclusions and taking into account the current and potential uses of the local groundwater, we recommend that no additional remedial actions be taken at the site, other than periodic monitoring of the two wells. As discussed in the conclusions, the contamination appears to be localized and migrating very slowly if at all . All wells in the vicinity of the spill are used for plant and lawn irrigation only with the closest well located approximately 1100 ft to the northeast (upgradient) -of the spill . The closest downgradient well is located approximately 1500 ft away. Furthermore, the adjacent Occidental Chemical Company facility, located directly downgradient, has been found to have a significant groundwater contamination problem resulting from the operation of that facility. Although steps are being taken to remediate the problem, the groundwater downgradient of the LOF facility will probably be unusable for the foreseeable future. We do, however, recommend that LOF implement a monitoring program for the two wells, MW-17 and MW-18. The program should include monitoring both wells for the presence of free product on a monthly basis with a water sample taken for lab analysis from MW-18 once every six months. Should free product appear in either well or significant levels of dissolved hydrocarbons be detected in MW-18, the Regional Water Quality Control Board should be notified and additional . remedial actions taken if necessary.