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in the method blank analyzed as part of the laboratory QA/QC program Since analysis of <br /> quarterly well monuornng samples and borehole samples have not indicated downgradient <br /> migration of diesel or it's constituents, it is likely that the impact to groundwater, encountered <br /> in the inial samples collected from wells MW-1 and MW-2 may have been due to <br /> incomplete well development or migration of off-site sourced hydrocarbons through adjacent <br /> utility fill <br /> In summary, inaccessible diesel impacted sods remain beneath the site building, which <br /> surround the abandoned 300 and 550 gallon diesel tanks Review of soil and groundwater <br /> analytical data does not indicate migration of the diesel fuel. As no detectable diesel or it's <br /> volatile components has been encountered during four consecutive quarterly monitoring <br /> events, the lack of migration appears to be a static condition It appears that no further action <br /> is warranted at this site U recommends the San Joaquin County Health Department review <br /> this case and recommend closure to the Central Valley Regional Water Quality Control <br /> Board <br /> MZ/03-17-93/ENG/'93-0034 jf 9 <br />