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3 <br /> '. tank overburden stockpile (approximately 10O yd ) was used as backfill for the diesel tank <br /> excavation on May 3, 1996. The two remaining stockpiles (diesel tank overburden and <br /> gasoline tank overexcavation�. totalling approximately 330 yd3) were both transported by <br /> representatives of Caballero Trucking to the Forward Incorporated landfill in Stockton for ; <br /> ,k disposal. Copies of the transport documents for the seventeen loads of soil are included as <br /> Appendix G. <br /> t <br /> i II a <br /> 3.0 Conclusions <br /> 3.1 Observations ;} <br /> The two UST's 1-4 000 gallon diesel fuel and 1-10 <br /> i ( g ,000 gallon unleaded gasoline) were found <br /> to be intact upon removal. No petroleum staining or odors i{were'noted in the diesel UST <br /> excavation; however petroleum odors were noted beneath the gasoline UST. Detectable <br /> gasoline concentrations were encountered in the verification soil samples collected from the <br /> center and the east end of the gasoline tank excavation. No detectable petroleum hydrocarbon <br /> concentrations were encountered in the verificationsoil samples collected beneath the diesel <br /> �+ tank. Overexcavation efforts were conducted in the gasoline tank)excavation, and final <br /> verification soil sample analytical results revealed no detectable petroleum concentrations <br /> < remained. <br /> In conclusion, based on review of the soil sample analytical results, it appears that a minor <br /> release of unleaded gasoline had occurred at the site; however <br /> g ! overexcavation efforts appear <br /> to have successfully removed the gasoline impacted soils. As no''finther detectable petroleum <br /> hydrocarbon concentrations have been encountered at the site, nofurther actions appear to be <br /> warranted at this site in association with the removal of the!two UST's. <br /> if ! <br /> c <br /> 3.2 Reporting Requirements r <br /> Copies of this report and its attachments should be forwarded to the following regulatory <br /> agencies: <br /> • Ms. Letitia Briggs and Mr. Harlan Knoll i <br /> I'Ih San Joaquin County Public Health Services <br /> Environmental Health Division iy <br /> PO Box 338 <br /> 304 E. Weber Avenue, Third Floor <br /> Stockton CA 95201 <br /> 6 <br /> ! <br /> 'P <br />