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I 0 f( IVV A S S O C I A T E S I N C -0 ■ radius of the site The search revealed nineteen wells located in the vicinity of the site and sixteen of these wells are within approximately 2,000 feet of the site Only one of the sixteen ' wells is located within 500 feet of the site The well locations are shown on Figure 11 The wells were located on the map according to "well location" description information provided ' on the well construction logs Available well construction logs are contained in Appendix G Based on ATC's current work at the site, the inferred regional groundwater gradient is to the southwest The well located southeast of the football field at Ripon High School (Well No 19) is the closest to the site (within approximately 500 feet west-southwest) According to the well data sheet provided by Ripon Unified School District, the well is approximately 185 feet deep and supplies irrigation water to the high school The screen interval is unknown, but the groundwater pump in the well is located at approximately 42 feet bgs The well is used by the Ripon Unified School District as an irrigation well for the high school fields A groundwater sample, identified as IWNW, was collected from this well on May 30, 2002 and analyzed for TPHg and TPHd by ' EPA method 8015, BTEX by EPA method 8020, and MTBE, ETBE, DIPE, TAME, or TBA by EPA method 8260 The sample contained no detectable concentrations of petroleum hydrocarbons Analytical data is summarized in Table 2 and lab data sheets are contained in Appendix C Because of its distance from the site and analytical results, it is ATC's ,judgment that it is unlikely that this well has been impacted by petroleum hydrocarbons from the site ' In ATC's Summary Report for Additional Subsurface Investigation at Ripon Unified School District, 304 North Acacia Avenue, Ripon, California, November 8, 1998, one domestic well ' (Well No 18) was located west of the site and supplied drinking water to the Ripon High School According to Mr Leo Zuber, Superintendent at Ripon Unified School District, the well was abandoned according to Department of Water Resources guidelines in the beginning of 2002 to ' make way for a swimming pool at the high school The Ripon High School and Ripon Elementary School are now supplied water by the City of Ripon Public Works Department 1 The well located on the northwest corner of Main Street and Acacia Avenue (Well No 17) is the closest downgradient well to the site (within approximately 1,000 feet southwest of the site) According to the log, the well is approximately 149 feet deep but the screen interval is not known The well is used by the Ripon Unified School District as an irrigation well for the elementary school fields A groundwater sample, identified as IWSW, was collected from this well on April 12, 2002 and analyzed for TPHg and TPHd by EPA method 8015 and BTEX by 1 EPA method 8020 The sample contained no detectable concentrations of petroleum hydrocarbons Analytical data is summarized in Table 2 and lab data sheets are contained in Appendix C Because of its distance from the site and analytical results, it is ATC's judgment that it is unlikely that this well has been impacted by petroleum hydrocarbons from the site w \I 30991reportslc1osure doe 8