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i 1.0 INTRODUCTION On behalf of the San Joaquin County Facilities Management Department, Ramage Environmental has prepared this Work Plan, Additional Site Investigation and Groundwater Monitoring Report, Fourth Quarter 2005 for submittal to the San Joaquin County Environmental Health Division (EHD) and to the Central Valley Regional Water Quality Control Board (RWQCB) EHD ' requested this work plan on November 17, 2005 The groundwater monitoring, sampling and analysis scope of work was completed according to Ramage Environmental's Work Plan, Monitonng Well Installations, dated July 16, 2001 On August 3, 2001, EHD approved the work plan 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 11 feet below street grade, and is accessed by a ramp on the west side of San Joaquin Street, approximately 150 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) A SORA ,I#Ilrm all ex-y 1.2 Previous Work � �� t 1 2 1 UST System Removal On August 30, 1996, Fisch Environmental removed the UST system According to the EHD ` inspection notes, the tank appeared to be in good condition, but the underground piping was 1 pitted, rusted, and disintegrating at the points EHD noted gasoline odor in the excavation Fisch Environmental collected two soil samples from beneath the north end and one soil sample from beneath the south end of the former UST, two soil samples from beneath the former underground piping (131 and P2), and a single soil sample from beneath the former dispenser (P3) The soil sample locations are shown on Figure 2, and the results of the soil sample analyses are summarized in Table 1 4