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�-- 1.0 INTRODUCTION <br /> On behalf of the San Joaquin Catholic Cemetery, Ramage Environmental, Inc. has prepared <br /> this Site Conceptual Model and Request for Case Closure for submittal to the San Joaquin <br /> County Environmental Health Division (EHD) and the Central Valley Regional Water Quality <br /> Control Board (RWQCB). <br /> t.. <br /> 1.1 Site Description <br /> The subject property is an operating cemetery, on level terrain, located on the northeast <br /> corner of Harding Way and Cemetery Lane in the city of Stockton (San Joaquin County), <br /> California (Figure 1). The project site is located on the east side of the mausoleum building <br /> (Figures 2, 3 and 4). <br /> 1.2 Project History <br /> 1.2.1 UST System Removal <br /> On November 17, 1989, Stockton Service Station Equipment Company, Inc. removed one <br /> 500-gallon gasoline UST and one 1,000-gallon gasoline UST in response to a failed tank <br /> tightness test, and a rapid loss of approximately 1,000 gallons of gasoline from the tank. A <br /> hole approximately 5-inches in diameter and numerous pin-sized holes were observed in the <br /> tank bottom. Three soil samples collected from beneath the former USTs contained up to <br /> 4,200 milligrams per kilogram (mg/kg) of Total Petroleum Hydrocarbons (TPH)-as-Gasoline <br /> and 21 mg/kg of benzene. The locations of the former USTs are shown on Figure 2, and the <br /> soil sample analytical results are summarized in Table 1. <br /> 1.2.2 Initial Site Characterization <br /> On January 30, 1991, WaterWork Corp. published a Problem Assessment Report for <br /> Investigation of Petroleum Hydrocarbon Contamination. Their scope of work included the <br /> installation of four soil borings (SB-1, SB-2, SB-3 and SB-4) and one groundwater monitoring <br /> well (MW-1). The soil boring and monitoring well locations are shown on Figure 2. Results of <br /> the soil and groundwater sampling indicated that groundwater had been impacted by gasoline <br /> ' hydrocarbons, and that the majority of the hydrocarbon mass was concentrated in soil <br /> r.. between 10 and 20 feet bgs. The soil sample analytical results are summarized in Table 1, <br /> the well construction details are summarized in Table 2, and the groundwater analytical <br /> results are included in Table 3. <br /> 4 <br /> iy <br />