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Environmental Health (EHD). It was determined however, that significant contamination has occurred and that a more thorough investigation must be conducted. • Approximately 687 tons of contaminated soil was excavated during the tank removal process. The soil was removed and placed on plastic sheeting pending analytical results. The stockpiles were covered with plastic and bermed to prevent t run-on and run-off. •' Soil disposal was determined after analytical results were received. After comparing the requirements of several landfills,recycling facilities, treatment facilities, or other options for managing the soil, it was decided to transport and dispose of the soil at Forward, Inc. Landfill in Lathrop, California. These activities were performed within (90) days of tank removal. Documentation is included in Appendix"C of this Report. 4.2 Sampling Procedures and Methods The following procedures were followed for samples that were taken during the tank removal. All procedures will conform to the guidelines issued by the U.S. Environmental Protection Agency, the Central Valley Regional Water Quality Control Board. These sampling procedures are summarized below. • All samples required for tank and site closure were analyzed by an independent State certified laboratory. • Per RWQCB Tri-Regional Recommendations, a minimum of two samples were taken beneath the tank. These samples were located within 1 to 2 feet(0.3 —0.6m) of the bottom at each end of the tank. Obviouslystained areas were noted and sampled. Groundwater was encountered. . P during over-excavation activities. As per requirements, at least one representative sample of the groundwater was taken and submitted to a State-certified laboratory for analysis using accepted practices as outlined by the Regional Water Quality Control Board and the Alameda County Water District. • The San Joaquin County Department of Environmental Health was notified at least three(3)working days in advance of the tank removal, and was notified a minimum of 72 hours, in advance of any additional sampling so that its personnel could be present during the soil samplings. • All samples were taken by a third party sampler provided by the Analytical Testing Laboratory. 3