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Monitoring Well Destruction Report <br /> First Student Bus Facility(Former A.W. Hayes Facility) <br /> 2005 Navy Drive—Stockton, CA <br /> 1.0 INTRODUCTION <br /> This Report describes activities conducted during the destruction of four (4) groundwater <br /> monitoring wells (MWs) on November 9, 2012 at the First Student Bus Facility (Former <br /> A.W. Hayes Facility) located at 2005 Navy Drive in Stockton California (hereafter Site) <br /> (see Figure 1 —Site Location Map). <br /> 2.0 BACKGROUND <br /> In 1987, one (1) 1,000-gallon waste oil underground storage tank (UST) and one (1) <br /> 12,000 gallon diesel UST were removed from the Site. Laboratory analytical results of <br /> soil samples collected from beneath the two (2) former USTs indicated that volatile <br /> aromatic compounds (benzene-toluene-ethylbenzene-xylenes) were detected in soil from <br /> beneath the south end of the diesel tank, and that low-level polychlorinated biphenyls <br /> were reported in the soil sample from beneath the waste-oil tank. An assessment of the <br /> extent of the petroleum contamination at the Site began in October 1999. Six (6) on-site <br /> locations were selected, and soil and groundwater samples were collected for analysis. <br /> Groundwater was encountered at a depth of approximately 15 feet below ground surface <br /> (bgs). Soil sample results collected during this investigation revealed that a trace amount <br /> of oil was detected in only one (1) of the soil samples. Groundwater sample results <br /> collected during this investigation revealed that total petroleum hydrocarbons as gasoline <br /> (TPH-g), total petroleum hydrocarbons as diesel (TPH-d), and some halogenated organic <br /> compounds (chlorinated solvents) were detected. In December 2003, three (3) shallow <br /> monitoring wells (MWs) (depths to approximately 30 feet below ground surface (bgs) <br /> and one (1) deeper MW (depth to approximately 60 feet bgs) were installed on-site. All <br /> four (4) monitoring wells were 2-inches in diameter. Laboratory test results of soil and <br /> groundwater samples collected from the Site in December 2003, November 2008, May <br /> 2010, January 2011, June 2011 and in December 2011 revealed that low levels of <br /> petroleum hydrocarbons were detected beneath the Site in both soil and groundwater. <br /> However, the concentrations of petroleum hydrocarbon levels detected in groundwater <br /> beneath the Site did not exceed the Water Quality Numerical Limits for Petroleum <br /> Products as listed in Appendix A of the Tri-Regional Recommendations. The UST <br /> related petroleum hydrocarbon levels in soil and groundwater are defined and do not <br /> appear to be high enough to warrant corrective action. As such, the California Regional <br /> Water Quality Control Board—Central Valley Region (CRWQCB-CVR) requested that a <br /> No Further Action Required (NFAR) Report be prepared for the Site regarding the <br /> former underground petroleum storage tank facility, and after review of the NFAR <br /> Report, the CRWQCB-CVR authorized the destruction of the four (4) monitoring wells <br /> located on the Site. <br /> 1 <br />