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10 INTRODUCTION Ramage Environmental has prepared this Groundwater Monitoring Report for the First Quarter of 1999, as requested by Mr Al Vigil of the San Joaquin Catholic Cemetery The scope of work was reviewed and supervised by Mr Harlin Knoll of the San Joaquin County Public Health Services Environmental Health Division (PHSIEHD) The cost to complete the scope of work was pre-approved on February 25, 1998 by the Underground Storage Tank Cleanup Fund (USTCF), under Claim #1092 1 1 Site 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 - Site ' Location Map) The project site is located on the east side of the mausoleum building (Figure 2 —Site Plan) 12 Previous Work To date, two underground gasoline storage tanks (UST) and associated pumping equipment have been 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 sod vapor extraction well nests have been installed No active soil or groundwater remediation has been conducted at the site Groundwater has been sampled at the site since August 1990 A dramatic rise in groundwater elevation since well installation in the early 1990s has resulted in groundwater table levels above the screened interval of the five groundwater monitoring wells The rise in groundwater elevation also resulted in static groundwater entering the deep sod vapor extraction wells During the summer of 1996, sampling of the groundwater monitoring wells was discontinued and sampling of the deep soil vapor extraction wells begun On May 20, 1998, Ramage Environmental published a Problem Assessment Report and Corrective Action Plan for the site Sod vapor extraction and air sparging were recommended as the most efficient and practical remedial alternatives 1