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Third Quarter 2001 Ground Water Monitoring Report Cleanu and Abatement Order NO 5-00-707 EAI Pro ect No 1232 ' In February 2001, seven new wells (MW-18D, MW-23S, MW-23D, MW-24S, MW-24D, MW- 25S, and MW-25D) were installed to assist in defining the vertical and lateral extent of hydrocarbon impacted ground water at the Unocal site and around the Robinhood Irrigation Well (see Section 1 1 3) In September 2001, four additional wells (MW-8D, MW-9, AS-26 and MW- 27) were installed to further define vertical and lateral hydrocarbon-impacted ground water at the site 1 1 3 Robinhood Irri ation Well RIW San Joaquin Delta College owns and formerly operated a ground water extraction well identified as "the Robinhood Irrigation Well" (RIW) (a k a Delta College Well) Tile RIW is located southwest of the intersection of Robinhood Drive and Pacific Avenue (see Figure 1) The RIW was installed in 1950 and is reported to be 322 feet deep with perforations in multiple zones beginning at depths as shallow as 40 feet below ground surface (bgs) According to the Water Well Driller's Report for the RIW, "no strata were sealed against pollution " Ground water from the RIW was formerly used to irrigate portions of Delta College's campus Ground water monitoring data for the Unocal and Wards sites show that historical pumping of the RIW influenced and changed the natural direction of ground water flow in the area from easterly, to south southwesterly i e , towards the RIW M Sampling of the RIW by Unocal and/or Wards for dissolved petroleum constituents began in 1997 and continued through June 15, 2000 Table 1 summarizes the results of testing ground water samples from the RIW In August 2000, Delta College students and staff complained of a gasoline odor from the water derived from the RIW As requested by the RWQCB, the RIW was taken out of service as of 6 00 AM August 22, 2000 The RWQCB in a letter dated February 26, 2001, requested that the RIW be destroyed ' On April 27, 2001, the San. Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) approved the EAI report entitled "Amended Work Plan for Destruction of Irrigation Well, San Joaquin Delta College — Robinhood Irrigation Well, 5151 Pacific Avenue, Stockton, California, " dated April 26, 2001 The RIW was abandoned in August 2001 1 14 Cleanup and Abatement Order On September 8, 2000, the RWQCB issued CAU No 5-00-707 The CAO requested the responsible parties to investigate and clean up petroleum hydrocarbons from the former UST ' systems located on the Wards and Unocal sites, and stated that discharges from these two properties have impacted ground water extracted and used by San Joaquin Delta College to irrigate its campus This report has been prepared in accordance with the quarterly reporting requirements outlined in the CAO As required by the CAO, each quarterly report shall include ' 13HM 1232RO192 2 EAl®