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• diesel might be present upgradient rather than downgradient of the tank cavity is unknown, <br /> unless it is derived from an unknown source to the north of TT-3 <br /> 5.0 CONCLUSIONS <br /> There was no change in groundwater flow this quarter, but two changes in contaminant <br /> concentrations were detected First, toluene was not detected in monitor well TT-2, as it had been <br /> in the third quarter Second, diesel was detected in TT-3, where no contaminants had previously <br /> been detected Such minor changes from quarter to quarter do occur, but are not necessarily <br /> significant <br /> The California Water Quality Control Board has recently reviewed its regulatory policies for <br /> hydrocarbon releases from underground storage tanks, and concluded that natural attenuation <br /> should be the preferred alternative to active remediation at most sites In light of this new <br /> paradigm regarding the health hazards of petroleum products in soil and groundwater, residual <br /> diesel contamination at Teresi Trucking should be viewed as posing an extremely low risk to <br /> public health in the vicinity Therefore, Upgradient recommends that the monitoring wells be <br /> destroyed in accordance with San Joaquin County PHS/EHD requirements When that has been <br /> completed, we recommend that PHS/EHD issue a No Further Action Request to the Central <br /> Valley Regional Water Quality Control Board <br /> • 3 <br />