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1.0 INTRODUCTION <br /> On behalf of the San Joaquin County Facilities Management Diepartrnent (responsible party and <br /> property owner), Ramage Environmental, Inc. has prepared this Monitoring Well Destruction and <br /> I <br /> Final Groundwater Monitoring Report for submittal to the San Joaquin County Environmental <br /> Health Division (EHD) and to the Central Valley Regional Water Quality Control Board (RWQCB). <br /> i � l <br /> On August 28, 2008, RWQCB concurred with EHD's recommendation of case closure. On <br /> i September 10, 2008, EHD directed that a work plan be submitted to destroy all on-site wells. On a <br /> September 19, 2008, Ramage Environmental submitted to EHD, Letter Work Plan, Destruction of i <br /> Groundwater Monitoring Wells. On October 10, 2008, EHD approved the work plan. On October <br /> 21, 2008, Ramage Environmental requested a variance to the approved work plan to over-drill the <br /> wells with 8-inch diameter hollow-stem augers instead of 10-inch diameter augers. On <br /> - <br /> monitoring els g g <br /> I h <br /> October 21, 2008, EHD approved the variance. Copies of the regulatory correspondence, and <br /> variance request and approval are included in Appendix A. <br /> 1.1 Site Location and Description E <br /> The site is a government vehicle parking area on the east side�of the county courthouse, located <br /> } at 222 E. Weber Avenue in Stockton, California (Figure 1). The parking area site is approximately <br /> 12 feet below street grade, and is accessed by a ramp on the west side of San Joaquin Street, <br /> il <br /> approximately 150 south of East Weber Avenue. A former 10.000-gallon gasoline underground <br /> storage tank (UST) and a single former gasoline dispenser existed at the site (Figure 2). <br /> 1.2 Previous Work <br /> 1.2.1 UST System Removal <br /> On August 30, 1996, Fisch Environmental removed the UST system: According to the EHD <br /> inspection notes, the tank appeared to be in good condition, b6�t the underground piping was <br /> pitted, rusted, and disintegrating at the joints. EHD noted gasoline odor in the excavation. <br /> Fisch Environmental collected two soil samples from beneath the noith end and one soil sample <br /> from beneath the south end of the former UST, two soil samples from beneath the former <br /> L underground piping (P1 and P2), and a single soil sample from beneath the former dispenser <br /> (P3). The soil sample locations are shown on Figure 2, and the results of the soil sample <br /> analyses are summarized in Table 1. <br /> I <br /> i <br /> 4 � <br />