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1 <br /> Working To Restore Nature <br /> Buren Street Property (Tank Pit B, Figure 2). The tanks were installed in 1965 All product <br /> lines were also removed during the original excavation work which was witnessed by a San <br /> ' Joaquin Public Health Services representative Laboratory analysis of soil samples collected <br /> beneath the gasoline tanks recorded elevated concentrations of hydrocarbon constituents (Table <br /> ' IA). Due to the elevated petroleum hydrocarbon concentrations in the soil and the presence of <br /> groundwater at a reported depth of 20 feet, further investigation was warranted <br /> 1 <br /> On September 10 and 11, 1990 five soil borings were drilled at the subject properties. Three <br /> tborings were completed as monitoring wells, two of which were installed in the vicinity of the <br /> former tank pit at 423 N Madison Street and one was installed in the vicinity of the former tank <br /> i <br /> 1 pit at 424 N Van Buren The wells were completed at a depth of 45 feet below grade. The <br /> ' two soil borings, completed at 21.5 feet below grade, were located adjacent to former tank pit <br /> at the Madison Street site The former tank pits and monitoring well and boring locations are <br /> shown on Figure 2 <br /> ' Soil samples collected at approximately 15 and 20 feet below grade level were analyzed for <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX) and total petroleum hydrocarbons as <br /> ' gasoline (TPHg) by EPA 8020 and DOHS methodology, and for oil and grease by standard <br /> method 503D&E Sample collection was based on photoionization detector (PID), olfactory and <br /> ' visual evidence of hydrocarbons Low to moderate levels of gasoline hydrocarbon analytes were <br /> present in all samples analyzed Oil and grease was not detected in any sample <br /> ' Groundwater samples were collected ectedfr m wells MW1 MW2 and MW3 on September 11, 1990 <br /> ' Dissolved petroleum hydrocarbon analytes were present in the wells on the Madison Street <br /> property (MW 1 and MW2); free product was present in the well located on the Van Buren Street <br /> ' property (MW3) Groundwater analytical data is presented in Table 2 <br /> t <br /> 1500901RP.PORT5ISR-0694 FNL <br /> 3 <br /> 1 <br />