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' f.\pmjuts\5137\rydemtk.rep <br /> ' 4.0 CONCLUSIONS <br /> Approximately 250 cubic yards of oily soil was excavated from beneath an aboveground <br /> waste oil storage tank and disposed of at Liquid Waste Management, Inc., a Class II <br /> Landfill in McKittrick, California. The vertical and lateral extent of the oily soil beneath <br /> the site was estimated by drilling and sampling soil borings and collecting excavation soi' <br /> samples. <br /> 1 <br /> The majority of the soil containing detectable concentrations of hydrocarbons has been <br /> ' removed, however final samples collected indicate that some soil containing 71 to 110 <br /> mg/kg TPH as Oil and Grease may still remain in the subsurface at a depth of 16 to 18 <br /> ' feet in the area of the excavation and beneath the building in a limited area as defined by <br /> soil borings. It is the opinion of ESE that further excavation and removal of this soil would <br /> ' threaten the structural integrity of the adjacent building. Additionally, the relatively low <br /> concentrations of Oil and Grease and the complete absence of detectable concentrations <br /> ' of volatile, semivolatile, and halogenated organics do not warrant further excavation. <br /> ' Ground-water data obtained for the area from the San Joaquin County Flood Control <br /> District indicate that the water table presently exists at a depth of at least 80 feet below <br /> grade. Due to this anticipated depth to ground water, low hydrocarbon concentrations <br /> remaining, limited volume of soil effected, and the immobility of the nonvolatile, heavier <br /> ' hydrocarbons that may remain in the soil, ESE does not believe that ground water beneath <br /> this site is threatened by the presence of these hydrocarbons. <br /> ' No regulatory agency review of this report is anticipated. The San Joaquin County Local <br /> ' Health District, Environmental Health Division has clearly stated that they have no funding <br /> for oversight/review of aboveground storage tank spills/cleanups. The RWQCB has also <br /> ' stated that they do not provide project oversight/review of aboveground tank spills/cleanup <br /> unless ground water is impacted. Finally, based on our past experience, the State of <br /> ' California, Department of Health Services will not provide project oversight/review of a <br /> project of this nature. Copies of this report will be submitted to all three agencies for their <br /> ' 8 <br /> i <br />