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! 10 INTRODUCTION On behalf of the San Joaquin County Facilities Management Department, Ramage Environmental, Inc has prepared this Revised Work Plan and Groundwater Monitonng Report, Second Quarter 2006 for submittal to the San Joaquin County Environmental Health Divjsion Ptr (EHD) and to the Central Valley Regional Water Quality Control Board (RWQCB) EHD requested this work pian on November 17, 2005 This revised work plan includes an expansion of the scope of work originally proposed by Ramage Environmental in Work Plan, Additional Site Investigation , dated February 17, 2006 EHD requested the revision to the work plan in their directive letter dated June 27, 2006 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 Vhe San Joaquin Street, approximately 150 south of East Weber Avenue One former 10,000-gallon c}-gyp-may gasoline underground storage tank (UST) and a single former gasoline dispenser existed at the site (Figure -0 0 0 !^d d,e'sA—I +an.K. 12 Previous Work 1 1 2 1 UST S stem 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 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 (P1 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