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GROUNDWATER ASSESSMENT REPORT C Analyses detected only 15 pg/L of MTBE in the groundwater in monitoring well MW-3 in ' January 2002 Three subsequent sampling events did not show concentrations of MTBE in MW-3 or the other monitoring wells O There is no indication that MTBE has migrated laterally or vertically beyond the areas of detected soil impact O The geology and hydrogeology does not appear conducive to initiating the future migration of MTBE from the former UST excavation o Public groundwater sources are located at substantial distances both laterally and vertically from the former UST location and migration of MTBE detected from the site to those sources is remote G Laboratory analyses did not detect total petroleum hydrocarbons as gasoline,benzene, toluene,ethylbenzene, and xylenes during the UST removal activities or subsequent soil and groundwater investigations or groundwater monitoring VIII. LIMITATIONS The judgments,conclusions, and recommendations described in this report pertain to the conditions judged to be present or applicable at the site and the time the work was performed M ESA's opinions were developed in accordance with accepted geologic, hydrogeologic,and engineering practices for this time and specific site It should be understood that the findings presented in this report are based on analytical results of soil samples collected at select onsite locations These results may not reflect conditions at locations not sampled The interpretations and conclusions contained in this report represent our professional opinions Other than this, no ' warranty is implied or intended ESA has prepared this report for review by the San Joaquin County Public Health Services, Environmental Health Division, Stockton, California and the California Regional Water Quality Control Board, Central Valley Region, Sacramento, California on behalf of the University of the Pacific, Stockton, California The exclusive use of this report is provided to the University of the Pacific, as site owner,the San Joaquin County Environmental Health Division for their review and approval for closure of the site, and the California Regional Water Quality Control Board for their review and approval for closure of the site, and shall be subject to terms and conditions of the contract between the University of the Pacific and ESA Any reliance on this report by other parties shall be at such parties' sole risk ' Groundwater Assessment Report 26 FSA 1200252 September 2003