SITE INFORMATION AND CORRESPONDENCE

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Chronology 433 Scotts Avenue Stockton, CA 03/13/02 Two 350 gallon gasoline underground storage tanks (USTs) were removed under the.Environmental Health Department (EHD) permit and inspection on this date. Soil samples were collected beneath the USTs and the analytical results of those samples evidenced contamination. Staining and odor was noted by EHD staff.' 04/10/02 An Unauthorized Release Report and a Notification of Hazardous Waste Discharge were filed on this date. 04/18/02 The site was placed in the Local Oversight Program on this date. 10/15/02 . Geoprobes 61 through B3 were advanced on this date. 12/30/02 Date of Preliminary Investigation and Evaluation Report that discusses the October 2002 work. Soil and groundwater contamination was found with the highest concentrations in soil at 15 feet below grade. 10/9-16/03 Monitoring wells MW1 through MW3 (screened 15 to 35 feet) were installed and soil boring B4 was completed to 57 feet during this time. 04/01/04 Date of Quarterly Report—Fourth Quarter 2003 that discusses the October 2003 work. All soil samples collected were beneath groundwater and the analytical results for contaminants were low to non-detect. A groundwater sample was collected from B4 at 53 feet which had significant contaminant concentrations. 12/01/04 Date of Sensitive Receptor Survey in which no drinking water wells were reportedly found within 2000 radial feet of the site. 03/09/05 The EHD received data from borings placed on property north of this site in June 2004 for an environmental assessment at that site. No contamination was found in the borings placed to the north of the former location of the USTs at this site. 7/19-25/05 Monitoring wells MW4 and MW5 (screened 15 to 35 feet)were installed, cone pentrometer test point CPT 1 and geoprobe borings B5 and B6 were completed during this time. 11/01/05 Date of Additional Site Assessment Repoq that discusses the July.2005 work. Water samples were collected from CPT 1 (placed near 134) at 54, 72 and 100 feet;below grade and were non-detect for contaminants. 06/07/07 Public notices were posted on this date as required by the UST regulations as part,of the Public Participation requirements for the proposed excavation of contaminated soil at the site. 07/9-10/07 Excavation of contaminated soil from the former UST area was performed during this time. The excavation was about 20 feet by 30 feet and 25 feet deep.