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Updated Site Conceptual Model and Second Quarter 2002 Monitoring and Remediation Report <br /> Cleanup and Abatement Order No 5-00-707 EAI Project No 1232 <br /> On April 27, 2001, the San Joaquin County Public Health Services, Environmental Health <br /> Division. (PHS-EHD) approved the EAI report entitled "Amended Work Plan for Destruction of <br /> Irrigation Well, San Joaquin Delta College — Rohinhood Irrigation Well, 5151 Pacific Avenue, <br /> .Stockton, California, " dated April 26, 2001 The RTW was abandoned in August 2001 <br /> In May 2002, the RIW was replaced The new Delta College irrigation well became <br /> Operational in July 2002 <br /> 1 1 5 Cleanup and Abatement Order <br /> On September 8, 2000, the RWQCB issued CAO No 5-00-707 The CAO requested the <br /> responsible parties investigate and clean up petroleum hydrocarbons from the former UST <br /> systems located on the Wards and Unocal sites, and stated that discharges from these two <br /> properties have impacted ground water extracted and used by San Joaquin Delta College to <br /> irrigate its campus This report has been prepared in accordance with the quarterly reporting <br /> requirements outlined in the CAO As required by the CAO, this quarterly report includes the <br /> following <br /> + Ground water analysis results for total petroleum hydrocarbons as gasoline (TPH-G) by <br /> modified EPA Method 8015, and volatile organic compounds (VOCs), including fuel <br /> oxygenates, e g , MTBE, TBA, DIPE, ETBE, TAME, and EDB by EPA Method 8260B <br /> + Ground water elevation contour maps <br /> • Hydrographs for representative monitoring wells <br /> + Pollutant concentration contour neaps for TPH-G and benzene <br /> a Tabular listing of all monitoring well details <br />' • Tabular results of current sampling data completed during the previous quarter <br /> + Tabular results of all previous data collected including current sampling data <br /> + Ground water purge data sheets <br /> • Narrative describing the work presented in the report, including methodology, <br /> conclusions, and recommendations <br /> • Schedule outlining future activities <br /> + Data documenting disposal of investigation derived wastes <br /> 1 <br /> r <br /> i <br />' RHM 1232RO231 -3- <br /> ENYIRONMENT4L,4 UDIT, INC <br />