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' 10 INTRODUCTION On behalf of the San Joaquin Catholic Cemetery, Ramage Environmental has prepared this Report, Additional Site Investigation for submittal to the San Joaquin County Public Health ' Services Environmental Health Division (PHS/EHD) and the Central Valley Regional Water Quality Control Board (RWQCB) The scope of work was completed according to Ramage ' Environmental's Work Plan, Additional Site Investigation, dated June 20, 2001 On September 13, 2001, PHS/EHD approved the work plan ' 1.1 Site Location and Description ' The subject property is an operating cemetery located on the northeast corner of Harding Way and Cemetery Lane in the city of Stockton (San Joaquin County), California (Figure 1) The project site is located on the east side of the mausoleum building (Figure 2) 1 2 Previous Work Summary ' 1 2 1 UST System Removal and Problem Assessment On November 17, 1989, two underground gasoline storage tanks (UST) and associated pumping equipment were removed from the site Based on evidence of impacted soil and groundwater beneath the site, a total of seven groundwater monitoring wells, two soil vapor extraction wells and two soil vapor extraction well nests were installed Groundwater has been sampled at the site since August 1990 The groundwater monitoring data are summarized in Table 1 and the groundwater analytical results are summarized in Table 2 A rising groundwater table resulted in levels above the screened interval of the original five groundwater monitoring wells and groundwater entering the deep soil vapor extraction wells On April 28, 1998, Ramage Environmental installed two groundwater monitoring wells (MW-6 and MW-7) to re-establish a groundwater table monitoring and sampling capability at the site On May 20, 1998, Ramage Environmental published a Problem Assessment Report and Corrective Action Plan for the site On September 8, 1998, the USTCF pre-approved the cost to tconstruct and operate a soil vapor extraction and air sparging system at the site The San Joaquin Catholic Cemetery contracted with ENSR Consultants (ENSR) to complete the pre- approved scope of work . 5