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1 10 INTRODUCTION 1 On behalf of the San Joaquin County Facilities Management Department, Ramage Environmental has prepared this Monitoring Well Installation Report for submittal to the San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) and to the Central Valley Regional Water Quality Control Board (RWQCB) The scope of work was completed according to Ramage Environmental's Work Plan, Monitoring Well Installations, dated July 16, 2001 On August 3, 2001, PHS/EHD approved the work plan A copy of the work plan approval is included in Appendix A ' 1 1 Site Location and Description ' The site is a government vehicle and sheriff bus parking area on the east side of the county courthouse, located at 222 E Weber Avenue in Stockton, California (Figure 1) The parking area ' site is approximately 12 feet below street grade, and is accessed by a ramp on the west side of San Joaquin Street, approximately 156"south of East Weber Avenue One former 10,000-gallon gasoline underground storage tank (UST) and a single former gasoline dispenser existed at the site (Figure 2) ' 1.2 Previous Work 1 2 1 UST System Removal On August 30, 1996, Fisch Environmental removed the UST system According to the PHS/EHD ' inspection notes, the tank appeared to be in good condition, but the underground piping was pitted, rusted, and disintegrating at the points Gasoline odor was noted in the excavation ' Two soil samples were collected from beneath the north end and one soil le was collected sample P from beneath the south end of the former UST, two soil samples were collected from beneath the former underground piping (P1 and P2), and a single soil sample was collected from beneath the former dispenser (P3) The soil sample locations are shown on Figure 2 and the results of these soil sample analyses are summarized in Table 1 I 5