ARCHIVED REPORTS_XR0006743 CASE 1

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approximately 200 cubic yards of soil from the UST excavation stockpile On April 21, 1999, PP Y Ramage Environmental documented the excavations and transmitted to PHS/EHD the soil and soil stockpile sample results On June 7, 1999, the San Joaquin Valley Unified Air Pollution Control District approved the uncontrolled aeration of the waste soil generated by the canopy support over-excavation and UST excavation On October 14, 1999, after approximately four months of aeration, Ramage Environmental re-sampled the soil pile On November 22, 1999, PHS/EHD approved the transfer of the remediated soil to the City of Manteca Police Confidence Course On December 3, 1999, Bob Evans Trucking loaded and transported 512 cubic yards of remediated soil to the city police site On November 16, 1999, Ramage Environmental submitted to PHS/EHD Preliminary Investigation and Evaluation Report, documenting the results from drilling 11 on-site Oeoprobe" sou borings (Figure 2) Results of the investigation indicated that the subsurface soil and groundwater had been impacted by elevated concentrations of gasoline hydrocarbons, including benzene and methyl tertiary butyl ether (MTBE) On November 16, 2000, Ramage Environmental submitted to PHS/EHD Water Well Survey Addendum, documenting the location of 56 domestic water supply wells within the site vicinity, and the sampling and analysis of groundwater from 12 wells within 500 feet of the site 4r On January 10, 2001, Ramage Environmental submitted to PHS/EHD Environmental Site investigation Report, documenting the results from cone penetration testing, discrete groundwater sampling, installing four groundwater table monitoring wells, and sampling 12 domestic water wells Results of the investigation indicated that impacts to groundwater extend into deeper groundwater-bearing intervals, but that no nearby domestic wells had been impacted • 4